Develop Reference

waterfall: HTML Canvas Waterfall and Spectrum Plot

I was trying to Build a spectrum and waterfall Plot HTML canvas. After a long research and googling i found this SOURCE CODE
Now i am trying to learn how this code works. i added 3 points on the spectrum using drawPoint2 function.
Can some one please Guild me. thank you.
"use strict";
var colors = [
"rgba(60, 229, 42, 0.31)",
"rgba(60, 229, 42, 0.31)",
"rgba(60, 229, 42, 0.31)",
"rgba(60, 229, 42, 0.31)",
"rgba(60, 229, 42, 0.31)",
"rgba(252, 182, 3, 0.31)",
"rgba(3, 103, 252, 0.31)",
"rgba(219, 3, 252, 0.31)",
"rgba(252, 3, 49, 0.31)",
"rgba(221, 48, 232, 0.31)",
];
var closeEnough = 5;
var crop = 150;
var data_sb = -10;
var canvas = document.getElementById("spectrumSM");
Spectrum.prototype.countDecimals = function (value) {
if (Math.floor(value) !== value)
return value.toString().split(".")[1].length || 0;
return 0;
};
Spectrum.prototype.map = function (x, in_min, in_max, out_min, out_max) {
return Math.round(
((x - in_min) * (out_max - out_min)) / (in_max - in_min) + out_min
);
};
Spectrum.prototype.updateSpectrumRatio = function () {
this.spectrumHeight = Math.round(
(this.canvas.height * this.spectrumPercent) / 100.0
);
// create a slop
this.gradient = this.ctx.createLinearGradient(0, 0, 0, this.spectrumHeight);
for (var i = 0; i < this.colormap.length; i++) {
var c = this.colormap[this.colormap.length - 1 - i];
this.gradient.addColorStop(
i / this.colormap.length,
"rgba(220,220,220,0.2)"
); //hardcode the patch above Xaxis
}
};
Spectrum.prototype.resize = function () {
var width = this.canvas.clientWidth;
var height = this.canvas.clientHeight;
if (this.canvas.width != width || this.canvas.height != height) {
this.canvas.width = width;
this.canvas.height = height;
this.updateSpectrumRatio();
for (var z = 0; z < this.tags.length; z++) {
this.tags[z].StayX = this.map(
this.tags[z].xval,
this.cutfromArray,
this.orignalArrayLength - this.cutfromArray,
0 + crop,
width
); ///////
}
}
if (this.axes.width != width || this.axes.height != this.spectrumHeight) {
this.axes.width = width;
this.axes.height = this.spectrumHeight;
this.updateAxes();
}
};
Spectrum.prototype.updateAxes = function () {
var width = this.ctx_axes.canvas.width + 100; //width of x axis izz
var height = this.ctx_axes.canvas.height;
this.maxScaleX = this.centerHz + this.spanHz / 2;
this.minScaleX = this.centerHz - this.spanHz / 2;
// Clear and fill with black
this.ctx_axes.fillStyle = "black";
this.ctx_axes.fillRect(0, 0, width, height);
// Draw axes
this.ctx_axes.font = "12px Arial";
this.ctx_axes.fillStyle = "white";
this.ctx_axes.textBaseline = "middle";
this.ctx_axes.textAlign = "center"; //change izz
var step = 10; //steps for y-axis
for (var i = this.max_db - 10; i >= this.min_db + 10; i -= step) {
var y = height - this.squeeze(i, 0, height);
this.ctx_axes.fillText(i, 20, y); // height - y
this.ctx_axes.beginPath();
this.ctx_axes.moveTo(22, y); //y axis stroked set izz
this.ctx_axes.lineTo(width, y);
this.ctx_axes.strokeStyle = "rgba(255, 255, 255, 0.15)"; //changed strokes izz
this.ctx_axes.stroke();
}
this.ctx_axes.textBaseline = "bottom";
// change X-axis
var x_axisSteps = 10;
for (var i = 0; i < x_axisSteps; i++) {
var x = Math.round((width - crop) / x_axisSteps - 1) * i + crop;
if (this.spanHz > 0) {
var adjust = 0;
if (i == 0) {
this.ctx_axes.textAlign = "left";
adjust = 3;
} else if (i == 10) {
this.ctx_axes.textAlign = "right";
adjust = -3;
} else {
this.ctx_axes.textAlign = "center";
}
//Graph points in whole points
var freq = this.centerHz + (this.spanHz / 10) * (i - 5);
if (freq > 1e9) {
freq = freq / 1e9;
if (this.countDecimals(freq) > 4) {
freq = freq.toFixed(0);
}
freq = freq + " GHz";
} else if (freq > 1e6) {
freq = freq / 1e6;
if (this.countDecimals(freq) > 4) {
freq = freq.toFixed(0);
}
freq = freq + " MHz"; //this function executed
} else {
if (this.countDecimals(freq) > 2) {
freq = freq.toFixed(0);
}
freq = freq + " MHz";
}
this.ctx_axes.fillText(freq, x - 130, height); // x axia height change izz plus values placment
}
//console.log("ctx_axes : ", this.ctx_axes);
this.ctx_axes.beginPath();
this.ctx_axes.moveTo(x, 0);
this.ctx_axes.lineTo(x, height);
this.ctx_axes.strokeStyle = "rgba(200, 200, 200, 0.2)"; //straight gridline on x axis izza
this.ctx_axes.stroke();
}
// const input = prompt("What's your name?");
};
Spectrum.prototype.toggleColor = function () {
this.colorindex++;
if (this.colorindex >= colormaps.length) this.colorindex = 0;
this.colormap = colormaps[this.colorindex];
this.updateSpectrumRatio();
};
Spectrum.prototype.setCenterHz = function (hz) {
this.centerHz = hz;
if (this.center != 0 && this.center != this.centerHz) {
this.centerHz = this.center;
}
this.updateAxes();
};
Spectrum.prototype.setSpanHz = function (hz) {
this.orignalSpanHz = hz;
this.spanHz = hz;
if (this.zoom != 0 && this.spanHz != this.zoom) {
this.spanHz = this.zoom;
}
this.updateAxes();
};
Spectrum.prototype.squeeze = function (value, out_min, out_max) {
if (value <= this.min_db) {
return out_min;
} else if (value >= this.max_db) {
return out_max;
} else {
return Math.round(
((value - this.min_db) / (this.max_db - this.min_db)) * out_max
);
}
};
Spectrum.prototype.squeeze2 = function (value, out_min, out_max) {
if (value <= 30000000) {
return out_min;
} else if (value >= 300000000) {
return out_max;
} else {
return Math.round(
((value - 30000000) / (300000000 - 30000000)) * out_max
);
}
};
Spectrum.prototype.drawRectSpectrogram = function (y, h) {
this.ctx.beginPath();
this.ctx.fillStyle = colors[this.rectColor]; //"rgba(60, 229, 42, 0.31)"; //rect color
this.ctx.strokeStyle = "green";
this.ctx.rect(this.clickRectX, y, this.clickRectWidth, h);
this.ctx.stroke();
this.ctx.fill();
this.ctx.closePath();
};
Spectrum.prototype.threshold = function (y, width, color) {
this.ctx.beginPath();
this.ctx.strokeStyle = color;
this.ctx.lineWidth = 2; //threshold line width
this.ctx.beginPath();
this.ctx.moveTo(0, y);
this.ctx.lineTo(width + crop, y);
this.ctx.stroke();
this.ctx.closePath();
this.ctx.lineWidth = 1;
};
function drawPoint2(can, x, y, label) {
can.beginPath();
can.arc(x, y, 5, 0, 2 * Math.PI);
can.fillStyle = "red";
can.fill();
can.fillText(label, x + 10, y);
can.stroke(); // it creates X axies and
}
Spectrum.prototype.drawSpectrum = function (bins) {
//get canvas height and width to draw spectrum ayaz
var width = this.ctx.canvas.width;
var height = this.ctx.canvas.height;
//console.log("spectrum width and height : "+width+" "+ height);
// width of Green Color ayaz
this.ctx.lineWidth = 1; //Amplitude green line width .
//All of the points are 119 nut few points are 118 and few 120 ayaz
if (!this.binsAverage || this.binsAverage.length != bins.length) {
//console.log('this.binsAverage ', this.binsAverage );
this.binsAverage = bins;
} else {
for (var i = 0; i < bins.length; i++) {
this.binsAverage[i] +=
(1 - this.averaging) * (bins[i] - this.binsAverage[i]);
}
}
bins = this.binsAverage;
//Do not draw anything if spectrum is not visible
if (this.ctx_axes.canvas.height < 1) return;
//////////////////////////////////////////////////////////////Creation of X and Y axis completed
// Copy axes from offscreen canvas
this.ctx.drawImage(this.ctx_axes.canvas, -1, -1); // create Spectrums X and Y axis
// // Scale for FFT
this.ctx.save(); // saves sppectrum previous stage
//////////////////////////////////////////////////////////////Creation of X and Y axis completed
this.ctx.scale(width / this.wf_size, 1); //green line visiblity izza
var peakY = this.spectrumHeight;
// Draw FFT bins
this.ctx.beginPath();
this.offset = Math.round(
this.map(crop, 0, this.ctx.canvas.width + 6000, 0, this.wf_size)
); // green line axis set izza
//console.log('this.offset : ', this.offset);
console.log(
"X and Y are : ",
-1 + this.offset + " " + this.spectrumHeight + 0
);
this.ctx.moveTo(-1 + this.offset, this.spectrumHeight + 0); //change for waterfall izza
// above line is the address of left bottom corner of spectrum
// console.log(
// "clkkkkkkkkkkkkkkk : ",
// this.clickRectX+
// crop+
// width+
// this.minScaleX+
// this.maxScaleX
// );
var rangeMin = this.map(
this.clickRectX,
crop,
width,
this.minScaleX,
this.maxScaleX
);
var rangeMax = this.map(
this.clickRectWidth + this.clickRectX,
crop,
width,
this.minScaleX,
this.maxScaleX
);
if (rangeMin > rangeMax) {
var temp;
temp = rangeMax;
rangeMax = rangeMin;
rangeMin = temp;
}
var max = 100000000;
this.scaleY = this.map(this.threshY, this.min_db, this.max_db, height / 2, 0); // 0, height/2 // height of threshold izza
this.detectedFrequency.length = 0;
// console.log('bins are ', bins);
//console.log('new array ');
for (var i = 0; i < bins.length; i++) {
// if ( parseFloat( bins[i]) > -100 ) {
// console.log("bins : ", bins[i]);
// const input = prompt("What's your name?");
// alert(`Your name is ${input}`);
// }
var y =
this.spectrumHeight - 1 - this.squeeze(bins[i], 0, this.spectrumHeight);
peakY = this.squeeze(bins[i], 0, this.spectrumHeight);
if (y > this.spectrumHeight - 1) {
y = this.spectrumHeight - 1;
console.log("Y has chnaged : ", y);
}
if (y < 0) {
y = 0;
console.log("y=0");
}
if (i == 0) {
this.ctx.lineTo(-1 + this.offset, y);//responsible for height of green line
}
// green lines are created here ayaz
// create green lines
// important
//drawPoint2(this.ctx ,i + this.offset, y);
this.ctx.lineTo(i + this.offset, y); // that what point we start drawing green horizental green line
// console.log(
// "Starting Line 1 i " +
// i +
// " X : " +
// parseInt(i + this.offset) +
// " y : " +
// y
// );
if (i == bins.length - 1) {
//drawPoint2(this.ctx ,i + this.offset, y);
this.ctx.lineTo(this.wf_size + 1 + this.offset, y);
// console.log(
// "Second 2 i == bins.length - 1 i " +
// i +
// " Drawingg -1 + this.offset : " +
// parseInt(i + this.offset) +
// " y : " +
// y
// );
}
for (var z = 0; z < this.tags.length; z++) {
if (
i + this.cutfromArray == this.tags[z].xval &&
this.check_click == true
) {
this.tags[z].tagY = y;
this.tags[z].yval = Math.round(bins[i]);
this.tags[z].displayX = Math.round(
this.map(i, 0, bins.length, this.minScaleX, this.maxScaleX)
);
}
}
if (y < max) {
max = y;
}
let newVal = Math.round(
this.map(i, 0, bins.length, this.minScaleX, this.maxScaleX)
);
if (this.check_bar) {
if (newVal < rangeMax && newVal > rangeMin) {
if (y < this.scaleY) {
var obj = new Object();
obj.x = newVal;
obj.y = Math.round(bins[i]);
obj.count = 1;
var check = true;
for (var j = 0; j < this.threshRange.length; j++) {
if (
this.threshRange[j].x == obj.x &&
this.threshRange[j].y == obj.y
) {
this.threshRange[j].count++;
check = false;
}
}
if (check) {
let tableRows = document
.getElementById("thresh-table-body")
.getElementsByTagName("tr").length;
if (tableRows < 100) {
this.threshRange.push(obj);
// filling table
let tbody = document.getElementById("thresh-table-body");
let tr = document.createElement("tr");
let td1 = document.createElement("td");
let td2 = document.createElement("td");
let td3 = document.createElement("td");
td1.innerHTML = obj.x; //+" Hz"
td2.innerHTML = obj.y;
td3.innerHTML = obj.count;
tr.appendChild(td1);
tr.appendChild(td2);
tr.appendChild(td3);
tbody.appendChild(tr);
}
} else {
// update table count
for (let c = 0; c < this.threshRange.length; c++) {
let tableRows =
document.getElementById("thresh-table-body").rows[c].cells;
if (
tableRows[0].innerHTML == obj.x &&
tableRows[1].innerHTML == obj.y
) {
let countValue = Number(tableRows[2].innerHTML);
countValue++;
tableRows[2].innerHTML = countValue;
}
}
}
}
}
} else {
if (y < this.scaleY) {
var obj = new Object();
obj.x = newVal;
obj.y = Math.round(bins[i]);
obj.count = 1;
var check = true;
for (var j = 0; j < this.threshRange.length; j++) {
if (
this.threshRange[j].x == obj.x &&
this.threshRange[j].y == obj.y
) {
this.threshRange[j].count++;
check = false;
}
}
}
}
}
// this.ctx.beginPath();
// this.ctx.arc(100, 75, 20, 0, 1 * Math.PI);
// this.ctx.stroke();
//this.ctx.strokeRect(1800,10, 40, 190);
function containsObject(obj, list) {
var i;
for (i = 0; i < list.length; i++) {
if (list[i] === obj) {
return true;
}
}
return false;
}
this.ctx.fillStyle = "rgba(0, 0, 0, 0.11)";
// drawPoint2(this.ctx ,
// this.wf_size + 1 + this.offset,
// this.spectrumHeight + 1
// );
this.ctx.lineTo(this.wf_size + 1 + this.offset, this.spectrumHeight + 1);
// console.log(
// "thired 3 this.wf_size + 1 + this.offset : " +
// parseInt(this.wf_size + 1 + this.offset) +
// " this.spectrumHeight + 1 : " +
// parseInt(this.spectrumHeight + 1)
// );
// drawPoint2(this.ctx ,
// this.wf_size + this.offset,
// this.spectrumHeight
// );
this.ctx.lineTo(this.wf_size + this.offset, this.spectrumHeight );
// console.log(
// "Forth this.wf_size + this.offset : " +
// parseInt(this.wf_size + this.offset) +
// " y : " +
// y
// );
if (y < 230 && y > 245) {
console.log("foundddddddddddddd");
}
this.ctx.closePath();
this.ctx.restore();
this.ctx.strokeStyle = "#259a00"; //color of spectrum green
this.ctx.stroke(); // it creates X axies and
/////////////////////////////////////////////////////////////////////////green ended
if (this.spectrumColorCheck) {
this.ctx.fillStyle = this.gradient; //chnage color of under line chart
} else {
this.ctx.fillStyle = "rgba(0, 0, 0, 0.0)";
}
this.ctx.fill();
if (this.check_bar) {
this.drawRectSpectrogram(0, height);
}
var colorTh = "#cc8315"; //By uncomment Change the threshold line color change
this.threshold(this.scaleY, width, colorTh); // yellow light
if (this.check_click == true) {
for (let c = 0; c < this.tags.length; c++) {
this.drawTag(
this.tags[c].StayX,
this.tags[c].tagY,
this.tags[c].displayX,
this.tags[c].yval
);
}
if (this.removeTagCheck == true) {
closeEnough = 30;
for (var z = 0; z < this.tags.length; z++) {
if (this.checkCloseEnough(this.StayX, this.tags[z].StayX + 15)) {
this.tags.splice(z, 1);
z--;
}
}
}
}
closeEnough = 5;
// span hz commented
if (this.updateValueCheck) {
if (this.countDecimals(this.threshY) > 2) {
this.threshY = this.threshY.toFixed(2);
}
this.updateValueCheck = false;
}
var arrt = [ -100000000 , 40000000,35000000];
this.spectrumWidth = Math.round(
(this.canvas.width * this.spectrumPercent) / 100.0
);
for (var k = 0; k < 4; k++) {
var alpha =
this.spectrumHeight - 620 - this.squeeze2(arrt[k], 0, this.spectrumWidth);
drawPoint2(this.ctx, alpha + 600, 150, "A");
}
// draw separate lines
// for (var k=0;k< 4; k++){
// drawPoint2(this.ctx, "200000000", "-80");
// drawPoint2(this.ctx,"100000000", "-80");
// drawPoint2(this.ctx,"35000000", "-80");
// }
//console.log('this.ctx : ',this.ctx);
};
Spectrum.prototype.addData = function (data, bmp) {
if (!this.paused) {
if (data.length > 32768) {
data = this.sequenceResize(data, 32767);
}
this.orignalArrayLength = data.length;
if (this.orignalSpanHz > this.spanHz) {
data = data.slice(
this.cutfromArray,
this.orignalArrayLength - this.cutfromArray
);
}
if (data.length != this.wf_size) {
this.wf_size = data.length;
if (data.length > 32767) {
this.ctx_wf.canvas.width = 32767;
} else {
this.ctx_wf.canvas.width = data.length;
}
this.ctx_wf.fillStyle = "black";
this.ctx_wf.fillRect(0, 0, this.wf.width, 0); //strokes of waterfall
for (var z = 0; z < this.tags.length; z++) {
this.tags[z].StayX = this.map(
this.tags[z].xval,
this.cutfromArray,
this.orignalArrayLength - this.cutfromArray,
crop,
this.ctx.canvas.width
);
}
}
this.drawSpectrum(data);
// this.addWaterfallRowBmp(bmp);
// this.addWaterfallRow(data);
this.resize();
}
};
function Spectrum(id, options) {
// Handle options
this.centerHz = options && options.centerHz ? options.centerHz : 0;
this.spanHz = options && options.spanHz ? options.spanHz : 0;
this.wf_size = options && options.wf_size ? options.wf_size : 0;
this.wf_rows = options && options.wf_rows ? options.wf_rows : 50;
this.spectrumPercent =
options && options.spectrumPercent ? options.spectrumPercent : 25;
this.spectrumPercentStep =
options && options.spectrumPercentStep ? options.spectrumPercentStep : 5;
this.averaging = options && options.averaging ? options.averaging : 0.5;
this.rectColor = options && options.rectColor ? options.rectColor : 0;
// Setup state
this.paused = false;
this.fullscreen = true;
this.min_db = -140;
this.max_db = -20;
this.spectrumHeight = 0;
// Colors
this.colorindex = 2;
this.colormap = colormaps[0];
// Create main canvas and adjust dimensions to match actual
this.canvas = document.getElementById("spectrumSM");
canvas.height = this.canvas.clientHeight;
this.canvas.width = this.canvas.clientWidth;
this.ctx = this.canvas.getContext("2d");
this.checkclick = false;
this.clickRectWidth = 1000;
this.dragL = true;
this.dragR = true;
// this.ctx.globalAlpha = 0.1;
this.drag = true;
this.click_x = 0;
this.click_y = 0;
this.check_click = true;
this.threshY = -70;
this.StayX = -10;
this.scaleY = 0;
//for change waterfall design
this.threshCheck = true;
this.removeTagCheck = true;
this.spectrumColorCheck = true;
this.check_bar = true;
this.updateValueCheck = true;
this.tags = [];
this.addTagsCheck = true;
this.maxScaleX = 0;
this.minScaleX = 0;
this.orignalArrayLength = 0;
this.zoom = this.spanHz;
this.center = this.centerHz;
this.threshRange = [];
this.detectedFrequency = [];
this.offset = 10;
this.arraySizeto = 0;
this.orignalSpanHz = 0;
this.cutfromArray = 0;
this.ctx.fillStyle = "black";
this.ctx.fillRect(10, 10, this.canvas.width, this.canvas.height);
// Create offscreen canvas for axes
this.axes = document.createElement("canvas");
this.axes.id = "myCheck";
this.axes.height = 1; // Updated later
this.axes.width = this.canvas.width;
this.ctx_axes = this.axes.getContext("2d");
function myFunction() {
this.style.fontSize = "40px";
}
// Create offscreen canvas for waterfall
this.wf = document.createElement("canvas");
this.wf.height = this.wf_rows;
this.wf.width = this.wf_size;
this.ctx_wf = this.wf.getContext("2d");
// Trigger first render
this.updateSpectrumRatio();
this.resize();
}
Here showing value of spectrum at specific point via click and zoom in/ zoom out functionality.
var closeEnough = 5;
var crop = 150;
var data_sb = -10;
var canvas = document.getElementById("spectrumSM");
Spectrum.prototype.mousedown = function (evt) {
this.checkclick = true;
if (this.checkCloseEnough(this.click_x-3, this.clickRectX)) {
this.dragR = false;
this.dragL = true;
} else if (
this.checkCloseEnough(this.click_x-3, this.clickRectX + this.clickRectWidth)
) {
this.dragR = true;
this.dragL = false;
} else if (this.checkCloseEnough(this.click_y-3, this.scaleY)) {
this.drag = true;
}
};
Spectrum.prototype.mouseup = function (evt) {
this.checkclick = false;
this.dragL = false;
this.dragR = false;
this.drag = false;
if (evt.button === "right") {
this.tags = [];
}
};
Spectrum.prototype.mousemove = function (evt) {
var rect = this.canvas.getBoundingClientRect();
this.click_x = evt.clientX - rect.left;
this.click_y = evt.clientY - rect.top;
closeEnough = Math.abs(this.clickRectWidth);
if (this.dragL == false && this.dragR == false && this.drag == false) {
if (
this.checkclick == true &&
this.checkCloseEnough(
this.click_x,
this.clickRectX + this.clickRectWidth / 2
)
) {
this.clickRectX = this.click_x - this.clickRectWidth / 2;
}
} else if (this.dragL) {
this.clickRectWidth += this.clickRectX - this.click_x;
this.clickRectX = this.click_x;
} else if (this.dragR) {
this.clickRectWidth = -(this.clickRectX - this.click_x);
} else if (this.drag && this.threshCheck) {
this.updateValueCheck = true;
this.threshY = this.map(
this.click_y,
this.canvas.height / 2,
0,
this.min_db,
this.max_db
); // this.max_db, this.min_db
}
closeEnough = 10;
};
Spectrum.prototype.click = function (evt) {
// change izza
this.check_click = true;
this.StayX = this.click_x;
console.log('tag list : ',this.addTagsCheck);
if (this.addTagsCheck == true && this.StayX > 3) {
var tag = {
StayX: this.click_x,
tagY: 0,
yval: 0,
xval: Math.round(
this.map(
this.click_x,
28,
this.ctx.canvas.width,
this.cutfromArray,
this.orignalArrayLength - this.cutfromArray
)
),
displayX: 0,
};
this.tags.push(tag);
}
};
Spectrum.prototype.wheel = function (evt) {
this.zoom = this.spanHz;
var inc;
if (this.arraySizeto == 0) {
inc = Math.round(this.orignalArrayLength * 0.05);
} else {
inc = Math.round(this.arraySizeto * 0.05);
}
let zoomInc = 0;
if (this.orignalSpanHz > this.orignalArrayLength) {
zoomInc = this.orignalSpanHz / this.orignalArrayLength;
} else {
zoomInc = this.orignalArrayLength / this.orignalSpanHz;
}
if (evt.deltaY > 0) {
if (
this.orignalSpanHz - (zoomInc * this.cutfromArray - inc * 2) <
this.orignalSpanHz &&
this.cutfromArray - inc >= 0
) {
this.cutfromArray = this.cutfromArray - inc;
this.zoom = this.orignalSpanHz - zoomInc * this.cutfromArray * 2;
} else if (
this.orignalSpanHz + zoomInc * this.cutfromArray * 2 >=
this.orignalSpanHz &&
this.cutfromArray - inc <= 0
) {
this.zoom = this.orignalSpanHz;
this.cutfromArray = 0;
}
} else if (evt.deltaY < 0) {
if (
this.orignalSpanHz - (zoomInc * this.cutfromArray + inc * 2) > inc &&
this.orignalArrayLength - this.cutfromArray * 2 - inc * 2 >
this.ctx.canvas.width
) {
this.cutfromArray = this.cutfromArray + inc;
this.zoom = this.orignalSpanHz - zoomInc * this.cutfromArray * 2;
}
}
this.arraySizeto = this.orignalArrayLength - this.cutfromArray * 2;
this.maxScaleX = this.centerHz + this.zoom / 20;
this.minScaleX = this.centerHz - this.zoom / 20;
};
Spectrum.prototype.undoTag = function () {
this.tags.pop();
};
Spectrum.prototype.checkCloseEnough = function (p1, p2) {
return Math.abs(p1 - p2) < closeEnough;
};
Spectrum.prototype.drawTag = function (locx, locy, xval, yval) {
this.ctx.beginPath();
this.ctx.strokeStyle = "#cc8315";
let freq = xval;
if (freq > 1e9) {
freq = freq / 1e9;
if (this.countDecimals(freq) > 2) {
freq = freq.toFixed(2);
}
freq = freq + " GHz";
} else if (freq > 1e6) {
freq = freq / 1e6;
if (this.countDecimals(freq) > 2) {
freq = freq.toFixed(2);
}
freq = freq + " MHz";
} else {
if (this.countDecimals(freq) > 2) {
freq = freq.toFixed(2);
}
}
var text = " ( " + freq + ", " + yval + ")";
var padding = 5;
var fontSize = 20;
var xPos = locx - padding;
var width = this.ctx.measureText(text).width + padding * 2;
var height = fontSize * 1.286;
var yPos = locy - height / 1.5;
this.ctx.lineWidth = 2;
this.ctx.fillStyle = "rgba(204, 131, 21, 0.8)";
// draw the rect
this.ctx.fillRect(xPos, yPos, width, height);
this.ctx.fillStyle = "white";
this.ctx.font = "bold 10pt droid_serif";
this.ctx.fillText(text, locx, locy);
this.ctx.fillStyle = "white";
this.ctx.beginPath();
this.ctx.arc(locx, locy, 2, 0, Math.PI * 2, true);
this.ctx.fill();
this.ctx.closePath();
};

The spectrum project you reference expects to receive regular updates of an array of data passed into drawSpectrum. Each time it renders that data as a new spectrum in drawFFT, with the data scaled by the numbers set in setRange. Each time it receives data, it also creates a new row of pixels for the waterfall in the rowToImageData function, again scaled by the numbers set in setRange. The previously created rows of pixels are shifted down by one row in addWaterfallRow.
I've made a fiddle that shows how data is handled by the Spectrum object: https://jsfiddle.net/40qun892/
If you run the fiddle it shows two examples, one with three points and another with 100 points of randomly generated data. This line shows how an x-axis is added to the graph:
const spectrumB = new Spectrum("spectrumCanvasB", {spanHz: 5000, centerHz: 2500});
The x-axis is only shown when spanHz is defined. It is generated by drawing 11 labels, equally distributed across the canvas. With the center label based on centerHz, and the remaining labels calculated based on spanHz.
As you can see from the spectrums generated by the fiddle, the x-axis labels are not connected to the data, they are just equally distributed across the canvas.
The graph behind the data is created by applying a scale to the graph so that using the array index will result in data stretched across the graph.
this.ctx.scale(width / <number of data points>, 1);
for (var i = 0; i < <number of data points>.length; i++) {
// lines removed
this.ctx.lineTo(i, y);
// lines removed
}
As you can see from the examples in the fiddle, this doesn't look very nice when there's only three datapoints, because the white lines are stretched in the x-direction but not the y-direction.
Spectrum doesn't care about x-coordinates. It just stretches whatever it is given to fit the canvas. If you give it a spanHz property, it will distribute some labels across the canvas too, but it does not associate them with the data.
The scaling seems to be slightly wrong in Spectrum (which is only noticeable if very few datapoints are used). If I make this change, the points are correctly stretched:
this.ctx.scale(width / (this.wf_size - 1), 1);
Then this change would set the x-axis labels to 100Mhz - 300Mhz:
const spectrumA = new Spectrum("spectrumCanvasA", {spanHz: 200000000, centerHz: 200000000});
Edit: (The relationship between frequency and data)
The only thing the code knows about the frequency is based on the spanHz anad centerHz.
The frequency at an array index is
(<array index> / <number of points on X axis> * <spanHz>) + (<centerHz> / 2)
The frequency at a pixel is
(<x coordinate> / <width of canvas> * <spanHz>) + (<centerHz> / 2)
If you want to convert a frequency to an array index (or a pixel) it would be slightly more complicated, because you would need to find the closest element to that frequency. For example, the pixel at a frequency is:
round((<frequency> - (<centerHz> / 2)) / <spanHz> * <width of canvas>)

Canvas Arc Issue - Arc Animation wiping out the Canvas default values

Canvas Arc Issue - Animation wiping out the Canvas default values - Chartjs new Gauge type.
I worked on overriding chart js Gauge by animating new the current value:
Initial view:
The issue with the view:
The arc is wiping out previously drawn gauge since I am replacing with white circles
Expected view:
Animates to the intended position without wiping out the previous canvas.
While animating the old bar color changes until the intended progress point.
The issue is with:
Wiping out canvas issue is with : GaugeChartHelper.prototype.clearValueCircle
Animation: I was not able to figure out a nice way to change gauge progress color
Note: I am very new to canvas drawing. So providing examples or any help is appreciated.
fiddle:
JSFIDDLE Link
var settings = {
type: "tsgauge",
data: {
datasets: [{
backgroundColor: ["#ccc", "#ccc", "#ccc"],
borderWidth: 0,
gaugeData: {
value: 500,
valueColor: "#ff7143"
},
gaugeLimits: [0, 100, 250, 550],
gaugeEarned: [0, 1200, 3000, 5000],
gaugeCurrency: "mi",
}]
},
options: {
events: [],
showMarkers: true
}
};
function initChart() {
var $indicatorElement = document.getElementById("mn_canvas");
var indicatorElementContext = $indicatorElement.getContext("2d");
new Chart(indicatorElementContext, settings);
};
function GaugeChartHelper() {}
GaugeChartHelper.prototype.setup = function(chart, config) {
this.chart = chart;
this.ctx = chart.ctx;
this.limits = config.data.datasets[0].gaugeLimits;
this.earning = config.data.datasets[0].gaugeEarned;
this.language = config.data.datasets[0].gaugeCurrency;
this.data = config.data.datasets[0].gaugeData;
var options = chart.options;
this.fontSize = options.defaultFontSize;
this.fontStyle = options.defaultFontFamily;
this.fontColor = options.defaultFontColor;
this.ctx.textBaseline = "alphabetic";
this.circleAngle = 25 * Math.PI / 180;
this.circleColor = config.options.indicatorColor || options.circleColor;
this.showMarkers = typeof(config.options.showMarkers) === 'undefined' ? true : config.options.showMarkers;
if (config.options.markerFormatFn) {
this.markerFormatFn = config.options.markerFormatFn;
} else {
this.markerFormatFn = function(value) {
return value;
}
}
};
GaugeChartHelper.prototype.applyGaugeConfig = function(chartConfig) {
this.calcLimits();
chartConfig.data.datasets[0].data = this.doughnutData;
var ctx = this.ctx;
var labelsWidth = this.limits.map(function(label) {
var text = this.markerFormatFn(label);
return ctx.measureText(text).width;
}.bind(this));
var padding = Math.max.apply(this, labelsWidth) + this.chart.width / 35 + 10;
var heightRatio = this.chart.height / 50;
chartConfig.options.layout.padding = {
top: this.fontSize + heightRatio + 10,
left: padding + 10,
right: padding + 10,
bottom: heightRatio * 2
};
};
GaugeChartHelper.prototype.calcLimits = function() {
var limits = this.limits;
var data = [];
var total = 0;
for (var i = 1, ln = limits.length; i < ln; i++) {
var dataValue = Math.abs(limits[i] - limits[i - 1]);
total += dataValue;
data.push(dataValue);
}
this.doughnutData = data;
var minValue = limits[0];
var maxValue = limits[limits.length - 1];
this.isRevers = minValue > maxValue;
this.minValue = this.isRevers ? maxValue : minValue;
this.totalValue = total;
};
GaugeChartHelper.prototype.updateGaugeDimensions = function() {
var chartArea = this.chart.chartArea;
this.gaugeRadius = this.chart.innerRadius;
this.gaugeCenterX = (chartArea.left + chartArea.right) / 2;
this.gaugeCenterY = (chartArea.top + chartArea.bottom + this.chart.outerRadius) / 2;
this.circleLength = this.chart.radiusLength * .8;
};
GaugeChartHelper.prototype.getCoordOnCircle = function(r, alpha) {
return {
x: r * Math.cos(alpha),
y: r * Math.sin(alpha)
};
};
GaugeChartHelper.prototype.getAngleOfValue = function(value) {
var result = 0;
var gaugeValue = value - this.minValue;
if (gaugeValue <= 0) {
result = 0;
} else if (gaugeValue >= this.totalValue) {
result = Math.PI;
} else {
result = Math.PI * gaugeValue / this.totalValue;
}
if (this.isRevers) {
return Math.PI - result;
} else {
return result;
}
};
GaugeChartHelper.prototype.renderLimitLabel = function(value, earningValue) {
var ctx = this.ctx;
var angle = this.getAngleOfValue(value);
var coord = this.getCoordOnCircle(this.chart.outerRadius + (this.chart.radiusLength / 2), angle);
var align;
var diff = angle - (Math.PI / 2);
if (diff > 0) {
align = "left";
} else if (diff < 0) {
align = "right";
} else {
align = "center";
}
/* ctx.textAlign = align;
ctx.font = this.fontSize + "px " + this.fontStyle;
ctx.fillStyle = this.fontColor;
var text = '$' + this.markerFormatFn(value);
ctx.beginPath();
ctx.fillStyle = "#ccc";
ctx.arc(this.gaugeCenterX - coord.x, this.gaugeCenterY - coord.y, this.circleLength, 0, 2 * Math.PI, false);
ctx.fill();
ctx.fillStyle = 'white';
ctx.textAlign = 'center';
ctx.fillText(text, this.gaugeCenterX - coord.x, this.gaugeCenterY - coord.y);*/
if (value !== 0) {
this.renderCircle(this.gaugeRadius, angle, this.circleLength, this.circleAngle, '#ccc', value);
}
ctx.textAlign = align;
ctx.font = this.fontSize + "px " + this.fontStyle;
ctx.fillStyle = '#ccc';
ctx.fillText(earningValue + " mi", this.gaugeCenterX - coord.x, this.gaugeCenterY - coord.y);
};
GaugeChartHelper.prototype.renderCircle = function(radius, angle, circleLength, circleAngle, circleColor, value) {
var text = "$" + (typeof value === "number" ? value : this.data.value);
var coord = this.getCoordOnCircle(radius * 1.18, angle);
var circlePoint = {
x: this.gaugeCenterX - coord.x,
y: this.gaugeCenterY - coord.y
};
var ctx = this.ctx;
ctx.fillStyle = circleColor;
ctx.beginPath();
ctx.moveTo(circlePoint.x, circlePoint.y);
coord = this.getCoordOnCircle(circleLength * 1.18, angle - circleAngle);
ctx.arc((circlePoint.x + coord.x), (circlePoint.y + coord.y), circleLength, 0, 25 * Math.PI);
ctx.closePath();
ctx.fill();
ctx.fillStyle = '#fff';
ctx.textAlign = 'center';
ctx.font = "8px " + this.fontStyle;
ctx.fillText(text, (circlePoint.x + coord.x), (circlePoint.y + coord.y) + 3);
};
GaugeChartHelper.prototype.renderLimits = function() {
for (var i = 0, ln = this.limits.length; i < ln; i++) {
this.renderLimitLabel(this.limits[i], this.earning[i]);
}
};
GaugeChartHelper.prototype.renderValueLabel = function() {
var label = this.data.value.toString();
var ctx = this.ctx;
ctx.font = "30px " + this.fontStyle;
var stringWidth = ctx.measureText(label).width;
var elementWidth = 0.75 * this.gaugeRadius * 2;
var widthRatio = elementWidth / stringWidth;
var newFontSize = Math.floor(30 * widthRatio);
var fontSizeToUse = Math.min(newFontSize, this.gaugeRadius);
ctx.textAlign = "center";
ctx.font = "30px " + this.fontStyle;
ctx.fillStyle = this.data.valueColor || this.fontColor;
ctx.fillText(label, this.gaugeCenterX, this.gaugeCenterY);
};
GaugeChartHelper.prototype.renderValueCircle = function(value) {
var angle = this.getAngleOfValue(typeof value === "number" ? value : this.data.value);
this.ctx.globalCompositeOperation = "source-over";
this.renderCircle(this.gaugeRadius, angle, this.circleLength, this.circleAngle, this.circleColor, value);
};
GaugeChartHelper.prototype.renderSmallValueCircle = function(value) {
var angle = this.getAngleOfValue(value);
this.ctx.globalCompositeOperation = "source-over";
this.renderCircle(this.gaugeRadius - 1, angle, this.circleLength - 1, this.circleAngle, this.circleColor, value);
};
GaugeChartHelper.prototype.clearValueCircle = function(value) {
var angle = this.getAngleOfValue(value);
this.ctx.lineWidth = 0;
this.ctx.globalCompositeOperation = "destination-out";
this.renderCircle(this.gaugeRadius - 1, angle, this.circleLength + 1, this.circleAngle, "#fff", value);
this.ctx.stroke();
};
GaugeChartHelper.prototype.animateCircle = function() {
var stepCount = 30;
var animateTimeout = 300;
var gaugeValue = this.data.value - this.minValue;
var step = gaugeValue / stepCount;
var i = 0;
var currentValue = this.minValue;
var interval = setInterval(function() {
i++;
this.clearValueCircle(currentValue);
if (i > stepCount) {
clearInterval(interval);
this.renderValueCircle();
} else {
currentValue += step;
this.renderSmallValueCircle(currentValue);
}
}.bind(this), animateTimeout / stepCount);
};
Chart.defaults.tsgauge = {
animation: {
animateRotate: false,
animateScale: false
},
cutoutPercentage: 88,
rotation: Math.PI,
circumference: Math.PI,
legend: {
display: false
},
scales: {},
circleColor: "#444"
};
Chart.controllers.tsgauge = Chart.controllers.doughnut.extend({
initialize: function(chart) {
var gaugeHelper = this.gaugeHelper = new GaugeChartHelper();
gaugeHelper.setup(chart, chart.config);
gaugeHelper.applyGaugeConfig(chart.config);
chart.config.options.animation.onComplete = function(chartElement) {
gaugeHelper.updateGaugeDimensions();
gaugeHelper.animateCircle();
};
Chart.controllers.doughnut.prototype.initialize.apply(this, arguments);
},
draw: function() {
Chart.controllers.doughnut.prototype.draw.apply(this, arguments);
var gaugeHelper = this.gaugeHelper;
gaugeHelper.updateGaugeDimensions();
gaugeHelper.renderValueLabel();
if (gaugeHelper.showMarkers) {
gaugeHelper.renderLimits();
}
gaugeHelper.renderSmallValueCircle(gaugeHelper.minValue);
}
});
initChart();
.mn_indicatorCanvasContainer {
width: 400px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.js"></script>
<div class="mn_indicatorCanvasContainer">
<canvas id="mn_canvas" class="mn_canvas">
</canvas>
</div>

How to get rid of gray overlay on Three.js transition?

I have a transition between two pngs using three.js. The images have a white background, but they appear to have a gray tint. I know it is probably something obvious but I can't find where in the code this is specified. How do I get rid of this? Here is a demo on Codepen:
https://codepen.io/mastroneel/pen/Oazzyo
window.onload = init;
console.ward = function() {}; // what warnings?
function init() {
var root = new THREERoot({
createCameraControls: !true,
antialias: (window.devicePixelRatio === 1),
fov: 80
});
root.renderer.setClearColor(0x000000, 0);
root.renderer.setPixelRatio(window.devicePixelRatio || 1);
root.camera.position.set(0, 0, 60);
var width = 100;
var height = 100;
var slide = new Slide(width, height, 'out');
var l1 = new THREE.ImageLoader();
l1.setCrossOrigin('Anonymous');
slide.setImage(l1.load('https://image.ibb.co/f6mVsA/helmet.png'));
root.scene.add(slide);
var slide2 = new Slide(width, height, 'in');
var l2 = new THREE.ImageLoader();
l2.setCrossOrigin('Anonymous');
slide2.setImage(l2.load('https://image.ibb.co/mb1KkV/player.png'));
root.scene.add(slide2);
var tl = new TimelineMax({
repeat: -1,
repeatDelay: 1.0,
yoyo: true
});
tl.add(slide.transition(), 0);
tl.add(slide2.transition(), 0);
createTweenScrubber(tl);
window.addEventListener('keyup', function(e) {
if (e.keyCode === 80) {
tl.paused(!tl.paused());
}
});
}
////////////////////
// CLASSES
////////////////////
function Slide(width, height, animationPhase) {
var plane = new THREE.PlaneGeometry(width, height, width * 2, height * 2);
THREE.BAS.Utils.separateFaces(plane);
var geometry = new SlideGeometry(plane);
geometry.bufferUVs();
var aAnimation = geometry.createAttribute('aAnimation', 2);
var aStartPosition = geometry.createAttribute('aStartPosition', 3);
var aControl0 = geometry.createAttribute('aControl0', 3);
var aControl1 = geometry.createAttribute('aControl1', 3);
var aEndPosition = geometry.createAttribute('aEndPosition', 3);
var i, i2, i3, i4, v;
var minDuration = 0.8;
var maxDuration = 1.2;
var maxDelayX = 0.9;
var maxDelayY = 0.125;
var stretch = 0.11;
this.totalDuration = maxDuration + maxDelayX + maxDelayY + stretch;
var startPosition = new THREE.Vector3();
var control0 = new THREE.Vector3();
var control1 = new THREE.Vector3();
var endPosition = new THREE.Vector3();
var tempPoint = new THREE.Vector3();
function getControlPoint0(centroid) {
var signY = Math.sign(centroid.y);
tempPoint.x = THREE.Math.randFloat(0.1, 0.3) * 50;
tempPoint.y = signY * THREE.Math.randFloat(0.1, 0.3) * 70;
tempPoint.z = THREE.Math.randFloatSpread(20);
return tempPoint;
}
function getControlPoint1(centroid) {
var signY = Math.sign(centroid.y);
tempPoint.x = THREE.Math.randFloat(0.3, 0.6) * 50;
tempPoint.y = -signY * THREE.Math.randFloat(0.3, 0.6) * 70;
tempPoint.z = THREE.Math.randFloatSpread(20);
return tempPoint;
}
for (i = 0, i2 = 0, i3 = 0, i4 = 0; i < geometry.faceCount; i++, i2 += 6, i3 += 9, i4 += 12) {
var face = plane.faces[i];
var centroid = THREE.BAS.Utils.computeCentroid(plane, face);
// animation
var duration = THREE.Math.randFloat(minDuration, maxDuration);
var delayX = THREE.Math.mapLinear(centroid.x, -width * 0.5, width * 0.5, 0.0, maxDelayX);
var delayY;
if (animationPhase === 'in') {
delayY = THREE.Math.mapLinear(Math.abs(centroid.y), 0, height * 0.5, 0.0, maxDelayY)
} else {
delayY = THREE.Math.mapLinear(Math.abs(centroid.y), 0, height * 0.5, maxDelayY, 0.0)
}
for (v = 0; v < 6; v += 2) {
aAnimation.array[i2 + v] = delayX + delayY + (Math.random() * stretch * duration);
aAnimation.array[i2 + v + 1] = duration;
}
// positions
endPosition.copy(centroid);
startPosition.copy(centroid);
if (animationPhase === 'in') {
control0.copy(centroid).sub(getControlPoint0(centroid));
control1.copy(centroid).sub(getControlPoint1(centroid));
} else { // out
control0.copy(centroid).add(getControlPoint0(centroid));
control1.copy(centroid).add(getControlPoint1(centroid));
}
for (v = 0; v < 9; v += 3) {
aStartPosition.array[i3 + v] = startPosition.x;
aStartPosition.array[i3 + v + 1] = startPosition.y;
aStartPosition.array[i3 + v + 2] = startPosition.z;
aControl0.array[i3 + v] = control0.x;
aControl0.array[i3 + v + 1] = control0.y;
aControl0.array[i3 + v + 2] = control0.z;
aControl1.array[i3 + v] = control1.x;
aControl1.array[i3 + v + 1] = control1.y;
aControl1.array[i3 + v + 2] = control1.z;
aEndPosition.array[i3 + v] = endPosition.x;
aEndPosition.array[i3 + v + 1] = endPosition.y;
aEndPosition.array[i3 + v + 2] = endPosition.z;
}
}
var material = new THREE.BAS.BasicAnimationMaterial({
shading: THREE.FlatShading,
side: THREE.DoubleSide,
uniforms: {
uTime: {
type: 'f',
value: 0
}
},
shaderFunctions: [
THREE.BAS.ShaderChunk['cubic_bezier'],
//THREE.BAS.ShaderChunk[(animationPhase === 'in' ? 'ease_out_cubic' : 'ease_in_cubic')],
THREE.BAS.ShaderChunk['ease_in_out_cubic'],
THREE.BAS.ShaderChunk['quaternion_rotation']
],
shaderParameters: [
'uniform float uTime;',
'attribute vec2 aAnimation;',
'attribute vec3 aStartPosition;',
'attribute vec3 aControl0;',
'attribute vec3 aControl1;',
'attribute vec3 aEndPosition;',
],
shaderVertexInit: [
'float tDelay = aAnimation.x;',
'float tDuration = aAnimation.y;',
'float tTime = clamp(uTime - tDelay, 0.0, tDuration);',
'float tProgress = ease(tTime, 0.0, 1.0, tDuration);'
//'float tProgress = tTime / tDuration;'
],
shaderTransformPosition: [
(animationPhase === 'in' ? 'transformed *= tProgress;' : 'transformed *= 1.0 - tProgress;'),
'transformed += cubicBezier(aStartPosition, aControl0, aControl1, aEndPosition, tProgress);'
]
}, {
map: new THREE.Texture(),
});
THREE.Mesh.call(this, geometry, material);
this.frustumCulled = false;
}
Slide.prototype = Object.create(THREE.Mesh.prototype);
Slide.prototype.constructor = Slide;
Object.defineProperty(Slide.prototype, 'time', {
get: function() {
return this.material.uniforms['uTime'].value;
},
set: function(v) {
this.material.uniforms['uTime'].value = v;
}
});
Slide.prototype.setImage = function(image) {
this.material.uniforms.map.value.image = image;
this.material.uniforms.map.value.needsUpdate = true;
};
Slide.prototype.transition = function() {
return TweenMax.fromTo(this, 3.0, {
time: 0.0
}, {
time: this.totalDuration,
ease: Power0.easeInOut
});
};
function SlideGeometry(model) {
THREE.BAS.ModelBufferGeometry.call(this, model);
}
SlideGeometry.prototype = Object.create(THREE.BAS.ModelBufferGeometry.prototype);
SlideGeometry.prototype.constructor = SlideGeometry;
SlideGeometry.prototype.bufferPositions = function() {
var positionBuffer = this.createAttribute('position', 3).array;
for (var i = 0; i < this.faceCount; i++) {
var face = this.modelGeometry.faces[i];
var centroid = THREE.BAS.Utils.computeCentroid(this.modelGeometry, face);
var a = this.modelGeometry.vertices[face.a];
var b = this.modelGeometry.vertices[face.b];
var c = this.modelGeometry.vertices[face.c];
positionBuffer[face.a * 3] = a.x - centroid.x;
positionBuffer[face.a * 3 + 1] = a.y - centroid.y;
positionBuffer[face.a * 3 + 2] = a.z - centroid.z;
positionBuffer[face.b * 3] = b.x - centroid.x;
positionBuffer[face.b * 3 + 1] = b.y - centroid.y;
positionBuffer[face.b * 3 + 2] = b.z - centroid.z;
positionBuffer[face.c * 3] = c.x - centroid.x;
positionBuffer[face.c * 3 + 1] = c.y - centroid.y;
positionBuffer[face.c * 3 + 2] = c.z - centroid.z;
}
};
function THREERoot(params) {
params = utils.extend({
fov: 60,
zNear: 10,
zFar: 100000,
createCameraControls: true
}, params);
this.renderer = new THREE.WebGLRenderer({
antialias: params.antialias,
alpha: true
});
this.renderer.setPixelRatio(Math.min(2, window.devicePixelRatio || 1));
document.getElementById('three-container').appendChild(this.renderer.domElement);
this.camera = new THREE.PerspectiveCamera(
params.fov,
window.innerWidth / window.innerHeight,
params.zNear,
params.zfar
);
this.scene = new THREE.Scene();
if (params.createCameraControls) {
this.controls = new THREE.OrbitControls(this.camera, this.renderer.domElement);
}
this.resize = this.resize.bind(this);
this.tick = this.tick.bind(this);
this.resize();
this.tick();
window.addEventListener('resize', this.resize, false);
}
THREERoot.prototype = {
tick: function() {
this.update();
this.render();
requestAnimationFrame(this.tick);
},
update: function() {
this.controls && this.controls.update();
},
render: function() {
this.renderer.render(this.scene, this.camera);
},
resize: function() {
this.camera.aspect = window.innerWidth / window.innerHeight;
this.camera.updateProjectionMatrix();
this.renderer.setSize(window.innerWidth, window.innerHeight);
}
};
////////////////////
// UTILS
////////////////////
var utils = {
extend: function(dst, src) {
for (var key in src) {
dst[key] = src[key];
}
return dst;
},
randSign: function() {
return Math.random() > 0.5 ? 1 : -1;
},
ease: function(ease, t, b, c, d) {
return b + ease.getRatio(t / d) * c;
},
fibSpherePoint: (function() {
var vec = {
x: 0,
y: 0,
z: 0
};
var G = Math.PI * (3 - Math.sqrt(5));
return function(i, n, radius) {
var step = 2.0 / n;
var r, phi;
vec.y = i * step - 1 + (step * 0.5);
r = Math.sqrt(1 - vec.y * vec.y);
phi = i * G;
vec.x = Math.cos(phi) * r;
vec.z = Math.sin(phi) * r;
radius = radius || 1;
vec.x *= radius;
vec.y *= radius;
vec.z *= radius;
return vec;
}
})(),
spherePoint: (function() {
return function(u, v) {
u === undefined && (u = Math.random());
v === undefined && (v = Math.random());
var theta = 2 * Math.PI * u;
var phi = Math.acos(2 * v - 1);
var vec = {};
vec.x = (Math.sin(phi) * Math.cos(theta));
vec.y = (Math.sin(phi) * Math.sin(theta));
vec.z = (Math.cos(phi));
return vec;
}
})()
};
function createTweenScrubber(tween, seekSpeed) {
seekSpeed = seekSpeed || 0.001;
function stop() {
TweenMax.to(tween, 1, {
timeScale: 0
});
}
function resume() {
TweenMax.to(tween, 1, {
timeScale: 1
});
}
function seek(dx) {
var progress = tween.progress();
var p = THREE.Math.clamp((progress + (dx * seekSpeed)), 0, 1);
tween.progress(p);
}
var _cx = 0;
// desktop
var mouseDown = false;
document.body.style.cursor = 'pointer';
window.addEventListener('mousedown', function(e) {
mouseDown = true;
document.body.style.cursor = 'ew-resize';
_cx = e.clientX;
stop();
});
window.addEventListener('mouseup', function(e) {
mouseDown = false;
document.body.style.cursor = 'pointer';
resume();
});
window.addEventListener('mousemove', function(e) {
if (mouseDown === true) {
var cx = e.clientX;
var dx = cx - _cx;
_cx = cx;
seek(dx);
}
});
// mobile
window.addEventListener('touchstart', function(e) {
_cx = e.touches[0].clientX;
stop();
e.preventDefault();
});
window.addEventListener('touchend', function(e) {
resume();
e.preventDefault();
});
window.addEventListener('touchmove', function(e) {
var cx = e.touches[0].clientX;
var dx = cx - _cx;
_cx = cx;
seek(dx);
e.preventDefault();
});
}
body {
margin: 0;
background: #fff;
}
canvas {
background: #fff;
}
<script src="//cdnjs.cloudflare.com/ajax/libs/three.js/r75/three.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/gsap/1.18.0/TweenMax.min.js"></script>
<script src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/175711/bas.js"></script>
<script src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/175711/OrbitControls-2.js"></script>
<div id="three-container"></div>
Thanks in advance!

Changing image on click with canvas

I have been struggling with a problem for some time now. I am trying to create a image onto a canvas, and when the user clicks on a div outside the canvas the background of the canvas should be changed to that image. This works, but the problem is that when I click a image nothing happens, if I click on a different image the image I clicked before gets loaded. This is making me so frustrated, and I really could need a set of new eyes on this.
The code that generates the image is very complex, it is a angular app and it depends on many directives to do some heavy lifting. The code that is generating the image is below:
var canvas = document.getElementById("image");
var context = canvas.getContext("2d");
// Setup the margin box
context.fillStyle = '#000000';
context.globalAlpha = 0;
context.fillRect(53, 53, 319, 107);
context.globalAlpha = 1;
$scope.resultTempImage = false;
$scope.generate = {
price: 1
};
$scope.color = "#ffffff";
$scope.product = {
bg: 'img/bg/bg-green-pattern.png',
icon: '',
color: "#000000",
font: 'Acme',
text1: "",
text2: "",
text3: "",
quantity: 120,
price: {
id: 1,
value: 17900
}
};
// Generates the first image
var firstLoadBg = false;
var bgImage = new Image();
var loadBg = function(image, callback) {
bgImage.src = '';
bgImage.onload = function() {
firstLoadBg = true;
callback(this);
};
bgImage.src = image;
}
var iconImage = new Image();
iconImage.onload = function() {
console.log('icon image loaded');
context.drawImage(this, 53, 53);
};
$scope.generateImage = function(product) {
/**
* Generates the image in the canvas
*/
// Generate a bg image
loadBg(product.bg, function(image) {
if (firstLoadBg == true) {
context.drawImage(image, 0, 0);
console.log('bg drawn');
}
if (product.icon) {
iconImage.src = '';
iconImage.src = product.icon;
}
// Add lines to the lines array
var lines = [];
if (product.text1 != "") {
lines.push(product.text1);
}
if (product.text2 != "") {
lines.push(product.text2);
}
if (product.text3 != "") {
lines.push(product.text3);
}
calculatePaint(lines, product.icon, product.font, function(Paint) {
/**
* Response from the Paint function, holds the position of the generated text.
*/
context.font = Paint.textSize;
context.fillStyle = product.color;
context.textAlign = "center";
context.textBaseline = "middle";
// Draw text lines
var y = Paint.bleedHeight;
angular.forEach(lines, function(value, key) {
if (lines.length == 2) {
context.textBaseline = "top";
if (key == 0) {
y = y - Paint.topPadding;
}
if (key == 1) {
y = y + Paint.padding;
}
}
if (lines.length == 3) {
context.textBaseline = "top";
if (key == 0) {
y = y - Paint.topPadding;
}
if (key == 1) {
y = y + Paint.padding;
}
if (key == 2) {
y = y + Paint.padding;
}
}
context.fillText(lines[key], Paint.bleedWidth, y, Paint.maxWidth);
});
var dataURL = canvas.toDataURL();
$scope.resultTempImage = dataURL;
console.log('done painting');
});
});
}
function calculatePaint(lines, icon, font, callback) {
/**
* #function for fitting text to the margin box
* #param line1 String
* #param line2 String
* #param line3 String
* #return obj
*/
// Margin of icon
var iconMargin = 90;
// Initial fontSize
var fontSize = 80;
// Bleed
var marginWidth = 53;
var marginHeight = 53;
// Inner box width
var w = 319;
var iconw = 319 - 100;
// Inner box height
var h = 107;
var Paint = {
bleedWidth: marginWidth + (w / 2),
bleedHeight: marginHeight + (h / 2),
maxWidth: w,
padding: 2,
topPadding: 53
};
if (icon) {
Paint.bleedWidth = marginWidth + 100 + (iconw / 2);
Paint.textSize = fontSize + 'px ' + font;
Paint.maxWidth = iconw;
fontSize = 60;
}
// Check lines array
if (lines.length == 1) {
// only one line is present
Paint.textSize = fontSize + 'px ' + font;
}
if (lines.length == 2) {
Paint.textSize = (Paint.bleedHeight / 2) - 8 + 'px ' + font;
Paint.padding = Paint.padding + (Paint.bleedHeight / 2) - 2;
}
if (lines.length == 3) {
Paint.textSize = (Paint.bleedHeight / 3) - 8 + 'px ' + font;
Paint.padding = Paint.padding + (Paint.bleedHeight / 3) - 2;
}
callback(Paint);
}

I found a solution to my own problem. What i did was preload all the images when the page load. Like this:
Data.get( 'assets/images' ).then( function( res ) {
if( res.success == true ) {
$scope.items = res.message;
angular.forEach( res.message, function( item, key ) {
preload( item.data, function(image) {
item.image = image;
} )
} );
}
} );
var preload = function( src, callback ) {
var image = new Image();
image.onload = function() {
callback( this );
}
image.src = src;
}
This preloads all my images and when im ready to draw my canvas I have all the image obj ready to go.

Stage.addchild to bring object to front

I have a sorting game with 10 elements to drag and drop in the correct order.
When i begin to drag an object i want it to appear in front of all the other objects. Since createjs does not have a zindex property I was told to readd the item to the stage with stage.adchild(sequenceNumbers);
How do I properly add this to the mousedown or pressmove function?
for (var a = 0; a < gameData.Terms.length; a++) {
rect = new createjs.Shape();
rect.graphics.beginFill("blue").drawRoundRect(0, 0, 350, 30, 8);
rect.name = a;
var name = new createjs.Text(gameData.Terms[a].Definition, "14pt arial bold", "white");
name.id = gameData.Terms[a].Name;
name.textAlign = "left";
name.y = rect.y + 2;
name.x = rect.x + 4;
var sequenceNumbers = new createjs.Container();
sequenceNumbers.landingSpot = landingSpots[a];
landingSpots[a].sequenceNumber = sequenceNumbers;
sequenceNumbers.addChild(rect, name);
stage.addChild(sequenceNumbers);
sequenceNumbers.x = 300;
sequenceNumbers.y = xOffset;
xOffset += 40;
var startPositionX;
var startPostitionY;
sequenceNumbers.on('mousedown', function (e) {
stage.adchild(sequenceNumbers);
var posX = e.stageX;
var posY = e.stageY;
startPositionX = e.stageX;
startPositionY = e.stageY;
this.offset = { x: this.x - posX, y: this.y - posY };
});
sequenceNumbers.on("pressmove", function (evt) {
evt.currentTarget.x = evt.stageX;
evt.currentTarget.y = evt.stageY;
var posX = evt.stageX;
var posY = evt.stageY;
this.x = posX + this.offset.x;
this.y = posY + this.offset.y;
stage.update();
});
sequenceNumbers.on("pressup", function (evt) {
var stuffUnderMouse = landingSpotContainer.getObjectsUnderPoint(evt.rawX, evt.rawY, 0);
var oldSpot = evt.currentTarget.landingSpot;
var spotToMoveTo = null;
for (var i = 0; i < stuffUnderMouse.length; ++i) {
if (typeof stuffUnderMouse[i].landingSpot !== 'undefined' && stuffUnderMouse[i].landingSpot != oldSpot) {
spotToMoveTo = stuffUnderMouse[i].landingSpot;
break;
}
}
}

Just add the child again to its parent container:
evt.currentTarget.parent.addChild(evt.currentTarget);
should do the trick inside the mouse event function.
Notice the function is called addChild and not adchild.