Develop Reference

Uncaught TypeError: (((item.value + 1) / total) * 100).floor is not a function

This code is running good here: https://jsfiddle.net/petersirka/fycx4kr1/
but not on other code editor like codepen or vscode getting error on line 33
//HTML
<svg id="svg" width="600" height="600"></svg>
//Javascript
function Donut(cx, cy, radius, data) {
function arcradius(cx, cy, radius, degrees) {`enter code here`
var radians = (degrees - 90) * Math.PI / 180.0;
return {
x: cx + (radius * Math.cos(radians)),
y: cy + (radius * Math.sin(radians))
};
}
var decimals = 4;
var total = 0;
var arr = [];
var beg = 0;
var end = 0;
var count = 0;
var half = radius / 2;
var midpoint = radius / 2.4;
for (var i = 0; i < data.length; i++)
total += data[i].value;
for (var i = 0; i < data.length; i++) {
var item = data[i];
var tmp = {};
var p = (((item.value + 1) / total) * 100).floor(2);
count += p;
if (i === length - 1 && count < 100)
p = p + (100 - count);
end = beg + ((360 / 100) * p);
tmp.index = i;
tmp.value = item.value;
tmp.data = item;
var b = arcradius(cx, cy, radius, end);
var e = arcradius(cx, cy, radius, beg);
var la = (end - beg) <= 180 ? 0 : 1;
tmp.d = ['M', b.x.floor(decimals), b.y.floor(decimals), 'A', radius, radius, 0, la, 0, e.x.floor(decimals), e.y.floor(decimals)].join(' ');
arr.push(tmp);
beg = end;
}
return arr;
}
// USAGE
(function(svg) {
var data = [{
value: 45
}, {
value: 25
}, {
value: 30
}];
var centerX = 300;
var centerY = 300;
var radius = 250;
var color = ['#7400b8', '#ff006e', '#3a86ff'];
var arr = Donut(centerX, centerY, radius, data);
for (var i = 0; i < arr.length; i++) {
var item = arr[i];
svg.asvg('<g><path d="{0}" stroke="{1}" fill="none" stroke-width="50" /></g>'.format(item.d, color[i]));
}
})(document.getElementById('#svg'));
I know Math.Floor is a function because I've used it before and I looked it up. Did I mess something up in the code? Thanks.
Sorry if this question is a little vague, I'm still learning (as you can see :p).

If you want to convert the line
var p = (((item.value + 1) / total) * 100).floor(2);
into an integer with the floor function, you must write it like this:
var p = Math.floor(((item.value + 1) / total) * 100);
So the term you want to apply the Math.floor() function is inside the brackets.
I don't know what that (2) at the end means though...

change color of each line in a vertex

I'm drawing each point of a vector as a vertex in P5.js.
I would like to change the color of each vertex in a loop separately like a rainbow. The thing is that it changes the color of all the vertex and I don't know why.
var x = 0.01
var y = 0
var z = 0
var sigma = 10
var prandtl = 28
var rayleigh = 8 / 3
var dt = 0.01
var positionPoint = []
var colorChange = 0;
function setup() {
createCanvas(800, 800, WEBGL)
colorMode(HSB)
}
function draw() {
background("grey")
formula()
noFill()
scale(5)
strokeWeight(3)
beginShape()
rotateZ(frameCount * 0.01);
rotateY(frameCount * 0.01);
for (var i = 0; i < positionPoint.length; i++) {
stroke(colorChange, 255, 255)
vertex(positionPoint[i].x, positionPoint[i].y, positionPoint[i].z)
colorChange += 0.001
if (colorChange > 255) {
colorChange = 0
}
}
endShape()
}
const formula = () => {
var dx = (sigma * (y - x)) * dt
var dy = (x * (prandtl - z) - y) * dt
var dz = (x * y - rayleigh * z) * dt
x = x + dx
y = y + dy
z = z + dz
positionPoint.push(createVector(x, y, z))
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.1.9/p5.min.js"></script>

Shapes drawn from corner points can only be colored uniformly. You need to draw separate line segments.
vertex(positionPoint[i].x, positionPoint[i].y, positionPoint[i].z)
line(positionPoint[i].x, positionPoint[i].y, positionPoint[i].z,
positionPoint[i+1].x, positionPoint[i+1].y, positionPoint[i+1].z)
Color channels are in range [0, 255]. Set colorChange = 0 before the loop and inclrement it by 1 in the loop:
colorChange = 0;
for (var i = 0; i < positionPoint.length-1; i++) {
// [...]
colorChange += 1
if (colorChange > 255) {
colorChange = 0
}
}
var x = 0.01
var y = 0
var z = 0
var sigma = 10
var prandtl = 28
var rayleigh = 8 / 3
var dt = 0.01
var positionPoint = []
var colorChange = 0;
function setup() {
createCanvas(800, 800, WEBGL)
colorMode(HSB)
}
function draw() {
background("grey")
formula()
noFill()
scale(5)
strokeWeight(3)
//beginShape()
rotateZ(frameCount * 0.01);
rotateY(frameCount * 0.01);
colorChange = 0;
for (var i = 0; i < positionPoint.length-1; i++) {
stroke(colorChange, 255, 255)
//vertex(positionPoint[i].x, positionPoint[i].y, positionPoint[i].z)
line(positionPoint[i].x, positionPoint[i].y, positionPoint[i].z, positionPoint[i+1].x, positionPoint[i+1].y, positionPoint[i+1].z)
colorChange += 1
if (colorChange > 255) {
colorChange = 0
}
}
//endShape()
}
const formula = () => {
var dx = (sigma * (y - x)) * dt
var dy = (x * (prandtl - z) - y) * dt
var dz = (x * y - rayleigh * z) * dt
x = x + dx
y = y + dy
z = z + dz
positionPoint.push(createVector(x, y, z))
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.1.9/p5.min.js"></script>

Draw regular polygons inscribed in a circle

I'm trying to draw regular polygons(square and equilateral triangle) inscribed in a circle of a given centre (x,y) and a radius (r). I'm using raphael.js.
Here's my function to draw a inscribed square:
function draw_square(x,y,radius){
var side= radius*(Math.sqrt(2));
var x = x - (side/2);
var y = y - (side/2);
var square= paper.rect(x, y, side, side);
}
Can anyone shed some light on how I could draw an equilateral triangle(inscribed in a given circle)?

First time I've used raphael, so you'll have to extract what you need from the following:
<html>
<body>
<div id="paper"></div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/raphael/2.1.4/raphael-min.js"></script>
<script>
var paper = new Raphael(document.getElementById('paper'), 256, 256);
var x = 128, y = 128, r = 64, n = 9;
paper.circle(x, y, r);
var xx, yy, i, a, pathString = "";
for (i = 0; i <= n; ++i) {
a = ((4 * Math.PI * i) + (Math.PI * n) + (2 * Math.PI)) / (2 * n);
xx = x + r * Math.cos(a);
yy = y + r * Math.sin(a);
pathString += (i == 0 ? "M " : " L ") + xx + " " + yy;
}
pathString += " z";
paper.path(pathString);
</script>
</body>
</html>
EDIT: Refactored to use var a, and to always have a horizontal base.

function draw_triangle(x, y, radius){
var x_offset =radius*(Math.cos(Math.PI/6));
var y_offset =radius*(Math.sin(Math.PI/6));
var x1 = x;
var y1 = y - radius;
var x2 = x + x_offset;
var y2 = y + y_offset;
var x3 = x - x_offset;
var y3 = y + y_offset;
var triangle = "M"+x1+","+y1+"L"+x2+","+y2+"L"+x3+","+y3+"Z";
var triangle= paper.path(triangle);
}
With a little help of trigo and raphael paper.path().

How do I draw x number of circles around a central circle, starting at the top of the center circle?

I'm trying to create a UI that has a lot of items in circles. Sometimes these circles will have related circles that should be displayed around them.
I was able to cobble together something that works, here.
The problem is that the outer circles start near 0 degrees, and I'd like them to start at an angle supplied by the consumer of the function/library. I was never a star at trigonometry, or geometry, so I could use a little help.
As you can see in the consuming code, there is a setting: startingDegree: 270 that the function getPosition should honor, but I haven't been able to figure out how.
Update 04/02/2014:
as I mentioned in my comment to Salix alba, I wasn't clear above, but what I needed was to be able to specify the radius of the satellite circles, and to have them go only partly all the way around. Salix gave a solution that calculates the size the satellites need to be to fit around the center circle uniformly.
Using some of the hints in Salix's answer, I was able to achieve the desired result... and have an extra "mode," thanks to Salix, in the future.
The working, though still rough, solution is here: http://jsfiddle.net/RD4RZ/11/. Here is the entire code (just so it's all on SO):
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script type="text/javascript" src="//code.jquery.com/jquery-1.10.1.js"></script>
<style type="text/css">
.circle
{
position: absolute;
width: 100px;
height: 100px;
background-repeat: no-repeat;background-position: center center;
border: 80px solid #a19084;
border-radius: 50%;
-moz-border-radius: 50%;
}
.sm
{
border: 2px solid #a19084;
}
</style>
<script type="text/javascript">//<![CDATA[
$(function () {
function sind(x) {
return Math.sin(x * Math.PI / 180);
}
/*the law of cosines:
cc = aa + bb - 2ab cos(C), where c is the satellite diameter a and b are the legs
solving for cos C, cos C = ( aa + bb - cc ) / 2ab
Math.acos((a * a + b * b - c * c) / (2 * a * b)) = C
*/
function solveAngle(a, b, c) { // Returns angle C using law of cosines
var temp = (a * a + b * b - c * c) / (2 * a * b);
if (temp >= -1 && temp <= 1)
return radToDeg(Math.acos(temp));
else
throw "No solution";
}
function radToDeg(x) {
return x / Math.PI * 180;
}
function degToRad(x) {
return x * (Math.PI / 180);
}
var satellite = {
//settings must have: collection (array), itemDiameter (number), minCenterDiameter (number), center (json with x, y numbers)
//optional: itemPadding (number), evenDistribution (boolean), centerPadding (boolean), noOverLap (boolean)
getPosition: function (settings) {
//backwards compat
settings.centerPadding = settings.centerPadding || settings.itemPadding;
settings.noOverLap = typeof settings.noOverLap == 'undefined' ? true : settings.noOverLap;
settings.startingDegree = settings.startingDegree || 270;
settings.startSatellitesOnEdge = typeof settings.startSatellitesOnEdge == 'undefined' ? true : settings.startSatellitesOnEdge;
var itemIndex = $.inArray(settings.item, settings.collection);
var itemCnt = settings.collection.length;
var satelliteSide = settings.itemDiameter + (settings.itemSeparation || 0) + (settings.itemPadding || 0);
var evenDistribution = typeof settings.evenDistribution == 'undefined' ? true : settings.evenDistribution;
var degreeOfSeparation = (360 / itemCnt);
/*
we know all three sides:
one side is the diameter of the satellite itself (plus any padding). the other two
are the parent radius + the radius of the satellite itself (plus any padding).
given that, we need to find the angle of separation using the law of cosines (solveAngle)
*/
//if (!evenDistribution) {
var side1 = ((satelliteSide / 2)) + ((settings.minCenterDiameter + (2 * settings.centerPadding)) / 2);
var side2 = satelliteSide;;
var degreeOfSeparationBasedOnSatellite = solveAngle(side1, side1, side2); //Math.acos(((((side1 * side1) + (side2 * side2)) - (side2 * side2)) / (side2 * side2 * 2)) / 180 * Math.PI) * Math.PI;
degreeOfSeparation = evenDistribution? degreeOfSeparation: settings.noOverLap ? Math.min(degreeOfSeparation, degreeOfSeparationBasedOnSatellite) : degreeOfSeparationBasedOnSatellite;
//}
//angle-angle-side
//a-A-B
var a = satelliteSide;
var A = degreeOfSeparation;
/*
the three angles of any triangle add up to 180. We know one angle (degreeOfSeparation)
and we know the other two are equivalent to each other, so...
*/
var B = (180 - A) / 2;
//b is length necessary to fit all satellites, might be too short to be outside of base circle
var b = a * sind(B) / sind(A);
var offset = (settings.itemDiameter / 2) + (settings.itemPadding || 0); // 1; //
var onBaseCircleLegLength = ((settings.minCenterDiameter / 2) + settings.centerPadding) + offset;
var offBase = false;
if (b > onBaseCircleLegLength) {
offBase = true;
}
b = settings.noOverLap ? Math.max(b, onBaseCircleLegLength) : onBaseCircleLegLength;
var radianDegree = degToRad(degreeOfSeparation);
//log('b=' + b);
//log('settings.center.x=' + settings.center.x);
//log('settings.center.y=' + settings.center.y);
var degreeOffset = settings.startingDegree;
if (settings.startSatellitesOnEdge) {
degreeOffset += ((offBase ? degreeOfSeparation : degreeOfSeparationBasedOnSatellite) / 2);
}
var i = ((Math.PI * degreeOffset) / 180) + (radianDegree * itemIndex);// + (degToRad(degreeOfSeparationBasedOnSatellite) / 2); //(radianDegree) * (itemIndex);
var x = (Math.cos(i) * b) + (settings.center.x - offset);
var y = (Math.sin(i) * b) + (settings.center.y - offset);
return { 'x': Math.round(x), 'y': Math.round(y) };
}
,
/* if we ever want to size satellite by how many need to fit tight around the base circle:
x: function calcCircles(n) {
circles.splice(0); // clear out old circles
var angle = Math.PI / n;
var s = Math.sin(angle);
var r = baseRadius * s / (1 - s);
console.log(angle);
console.log(s);
console.log(r);
console.log(startAngle);
console.log(startAngle / (Math.PI * 2));
for (var i = 0; i < n; ++i) {
var phi = ((Math.PI * startAngle) / 180) + (angle * i * 2);
var cx = 150 + (baseRadius + r) * Math.cos(phi);
var cy = 150 + (baseRadius + r) * Math.sin(phi);
circles.push(new Circle(cx, cy, r));
}
},
*/
//settings must have: collection (array), itemDiameter (number), minCenterDiameter (number), center (json with x, y numbers)
//optional: itemPadding (number), evenDistribution (boolean), centerPadding (boolean), noOverLap (boolean)
getAllPositions: function (settings) {
var point;
var points = [];
var collection = settings.collection;
for (var i = 0; i < collection.length; i++) {
settings.item = collection[i]
points.push(satellite.getPosition(settings));
}
return points;
}
};
var el = $("#center"), cnt = 10, arr = [], itemDiameter= 100;
for (var c = 0; c < cnt; c++) {
arr.push(c);
}
var settings = {
collection: arr,
itemDiameter: itemDiameter,
minCenterDiameter: el.width(),
center: { x: el.width() / 2, y: el.width() / 2 },
itemPadding: 2,
evenDistribution: false,
centerPadding: parseInt(el.css("border-width")),
noOverLap: false,
startingDegree: 270
};
var points = satellite.getAllPositions(settings);
for (var i = 0; i < points.length; i++) {
var $newdiv1 = $("<div></div>");
var div = el.append($newdiv1);
$newdiv1.addClass("circle").addClass("sm");
$newdiv1.text(i);
$newdiv1.css({ left: points[i].x, top: points[i].y, width: itemDiameter +'px', height: itemDiameter +'px' });
}
});//]]>
</script>
</head>
<body>
<div id="center" class="circle" style="left:250px;top:250px" >
</div>
</body>
</html>

The central bit you need to work out is radius of the small circles. If you have R for radius of the central circle and you want to fit n smaller circles around it. Let the as yet unknown radius of the small circle be r. We can construct a right angle triangle with one corner in the center of the big circle one in the center of the small circle and one which is where a line from the center is tangent to the small circle. This will be a right angle. The angle at the center is a the hypotenuse has length R+r the opposite is r and we don't need the adjacent. Using trig
sin(a) = op / hyp = r / (R + r)
rearrange
(R+r) sin(a) = r
R sin(a) + r sin(a) = r
R sin(a) = r - r sin(a)
R sin(a) = (1 - sin(a)) r
r = R sin(a) / ( 1 - sin(a))
once we have r we are pretty much done.
You can see this as a fiddle http://jsfiddle.net/SalixAlba/7mAAS/
// canvas and mousedown related variables
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var $canvas = $("#canvas");
var canvasOffset = $canvas.offset();
var offsetX = canvasOffset.left;
var offsetY = canvasOffset.top;
var scrollX = $canvas.scrollLeft();
var scrollY = $canvas.scrollTop();
// save canvas size to vars b/ they're used often
var canvasWidth = canvas.width;
var canvasHeight = canvas.height;
var baseRadius = 50;
var baseCircle = new Circle(150,150,50);
var nCircles = 7;
var startAngle = 15.0;
function Circle(x,y,r) {
this.x = x;
this.y = y;
this.r = r;
}
Circle.prototype.draw = function() {
ctx.beginPath();
ctx.arc(this.x,this.y,this.r, 0, 2 * Math.PI, false);
ctx.stroke();
}
var circles = new Array();
function calcCircles(n) {
circles.splice(0); // clear out old circles
var angle = Math.PI / n;
var s = Math.sin(angle);
var r = baseRadius * s / (1-s);
console.log(angle);
console.log(s);
console.log(r);
for(var i=0;i<n;++i) {
var phi = startAngle + angle * i * 2;
var cx = 150+(baseRadius + r) * Math.cos(phi);
var cy = 150+(baseRadius + r) * Math.sin(phi);
circles.push(new Circle(cx,cy,r));
}
}
function draw() {
baseCircle.draw();
circles.forEach(function(ele){ele.draw()});
}
calcCircles(7);
draw();

A relative rotation in an animation

I have a problem with Raphael.js. I want to rotate the "compassScale" - set in the following code - in a relative manner.
This works for the paths, but all the texts "animate" to the absolute rotation of 30 degree. I want them to rotate to the 30 degrees relative from their actual positions.
var compassScale = paper.set();
var centerX = 200;
var centerY = 200;
var radius = 195;
var compasCircle = paper.circle(centerX, centerY, radius);
for(var i = 0; i < 360; i++) {
var winkelRad = i * (Math.PI/180)
var xStart = centerX + Math.sin(winkelRad) * radius;
var yStart = centerY + Math.cos(winkelRad) * radius;
var diff = 6;
if(i % 10 === 0){
compassScale.push(paper.text(centerX, centerY - radius + 18, i).rotate(i, centerX, centerY, true));
diff = 12;
} else if(i % 5 === 0) {
diff = 8;
}
var xEnd = centerX + Math.sin(winkelRad) * (radius - diff);
var yEnd = centerY + Math.cos(winkelRad) * (radius - diff);
compassScale.push(paper.path("M" + xStart + " " + yStart + " L" + xEnd + " " + yEnd));
}
compassScale.animate({rotation:"30 " + centerX + " " + centerY}, 5000);

Like you said, the problem is that you're animating all elements to 30 degrees, not their current rotation + 30 degrees. It's actually quite simple once you think of it that way. Here is your revised code that works:
var compassScale = paper.set();
var texts = []; // array to hold the text elements
var centerX = 200;
var centerY = 200;
var radius = 195;
var compasCircle = paper.circle(centerX, centerY, radius);
for(var i = 0; i < 360; i++) {
var winkelRad = i * (Math.PI/180)
var xStart = centerX + Math.sin(winkelRad) * radius;
var yStart = centerY + Math.cos(winkelRad) * radius;
var diff = 6;
if(i % 10 === 0){
texts.push(paper.text(centerX, centerY - radius + 18, i).rotate(i, centerX, centerY, true));
diff = 12;
} else if(i % 5 === 0) {
diff = 8;
}
var xEnd = centerX + Math.sin(winkelRad) * (radius - diff);
var yEnd = centerY + Math.cos(winkelRad) * (radius - diff);
compassScale.push(paper.path("M" + xStart + " " + yStart + " L" + xEnd + " " + yEnd));
}
compassScale.animate({rotation:"30 " + centerX + " " + centerY}, 5000);
// loop through the text elements, adjusting their rotation by adding 30 to their individual rotation
for (var i = 0, l = texts.length; i < l; i += 1) {
// node.attr("rotation") returns something like 50 200 200, so we have to split the string and grab the first number with shift
texts[i].animate({rotation: (30 + +texts[i].attr("rotation").split(" ").shift()) + " " + centerX + " " + centerY}, 5000);
}

Just a quick observation:
Looks like "Rotation" isn't part of the Atrr anymore since ver 2, so you can't use it in "animate", but you can replace that with "transform: "r" + (some degree)"..
eg:
element.animate( {transform: "r" + (-90)}, 2000, 'bounce');