How better organize grid lines? - javascript

There are grid lines from points.
Is there another solution with better performance, because if I add many svg elements(etc. rects, circles, paths) and increase the dimension of the grid I will see the freeze effect when I use zoom, move element...
The size of the grid is changed.
Also, how can I create endless grid lines, instead limited (gridCountX, gridCountY)?
Thanks
var svg = d3.select("body").append("svg");
var svgG = svg.append("g");
var gridLines = svgG.append("g").classed("grid-lines-container", true).data(["gridLines"]);
var gridCountX = _.range(100);
var gridCountY = _.range(100);
var size = 10;
gridLines.selectAll("g").data(gridCountY)
.enter()
.append("g")
.each(function(d) {
d3.select(this).selectAll("circle").data(gridCountX).enter()
.append("circle")
.attr("cx", function(_d) {return _d*size;})
.attr("cy", function(_d) {return d*size;})
.attr("r", 0.5)
.attr("style", function() {
return "stroke: black;";
});
});
var zoomSvg = d3.zoom()
.scaleExtent([1, 10])
.on("zoom", function(){
svgG.attr("transform", d3.event.transform);
});
svg.call(zoomSvg);
svg {
width: 100%;
height: 100%;
border: 1px solid #a1a1a1;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>
<script src="https://d3js.org/d3.v4.min.js"></script>

As you note, this approach is not really scalable and has a larger impact on performance. I have found the approach of utilizing d3 axes for grids to have minimal performance impact while also being relatively straightforward to incorporate with zoom such that you can have infinite zoom with the grid lines updating in a sensible manner due to the "magic" of automatic generation of sensible tick locations in d3.
To implement something similar in d3 v4, you can do something along these lines:
var svg = d3.select("svg"),
margin = {top: 20, right: 140, bottom: 50, left: 70},
width = svg.attr("width") - margin.left - margin.right,
height = svg.attr("height") - margin.top - margin.bottom,
g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")"),
innerSvg = g.append("svg").attr("width", width).attr("height", height);
// Calculate domain for x and y from data and store in x0, y0 (not shown here)
x.domain(x0);
y.domain(y0);
xGridAxis = d3.axisBottom(x).ticks(10);
yGridAxis = d3.axisLeft(y).ticks(10 * height / width);
// Create grouping and additional set of axes for displaying grid
innerSvg.append("g")
.attr("class", "grid x-grid")
.attr("transform", "translate (0," + height + ")")
.call(xGridAxis
.tickSize(-height, 0, 0)
.tickFormat("")
)
.selectAll(".tick");
innerSvg.append("g")
.attr("class", "grid y-grid")
.attr("transform", "translate (" + width + ", 0)")
.call(yGridAxis
.tickSize(width)
.tickFormat("")
);
// Add element to capture mouse events for drag and pan of plots
var zoom = d3.zoom()
.on("zoom", zoomed);
var scrollZoom = innerSvg.append("rect")
.attr("class", "zoom")
.attr("width", width)
.attr("height", height)
.attr("pointer-events", "all") // Defaults to panning with mouse
.call(zoom);
// Mouse panning and scroll-zoom implementation using d3.zoom
// Modification of : http://bl.ocks.org/lorenzopub/013c0c41f9ffab4d27f860127f79c5f5
function zoomed() {
lastEventTransform = d3.event.transform;
// Rescale the grid using the new transform associated with zoom/pan action
svg.select(".x-grid").call(xGridAxis.scale(lastEventTransform.rescaleX(x)));
svg.select(".y-grid").call(yGridAxis.scale(lastEventTransform.rescaleY(y)));
// Calculate transformed x and y locations which are used to redraw all plot elements
var xt = lastEventTransform.rescaleX(x),
yt = lastEventTransform.rescaleY(y);
// Code below just shows how you might do it. Will need to tweak based on your plot
var line = d3.line()
.x(function(d) { return xt(d.x); })
.y(function(d) { return yt(d.y); });
innerSvg.selectAll(".line")
.attr("d", function(d) { return line(d.values); });
innerSvg.selectAll(".dot")
.attr("cx", function(d) {return xt(d.x); })
.attr("cy", function(d) {return yt(d.y); });
}
Here is a worked out example in d3 v4 that inspired my version above:
http://bl.ocks.org/lorenzopub/013c0c41f9ffab4d27f860127f79c5f5

Related

D3Js v3: Path not showing up on Node Elements

With Javascript Im generating HTML-Code with a SVG in it. I want to display a a donut chart in it then. Im able to draw the chart on a static HTML-Element. However, when I try to display it in my JavaScript-generated node element the path is not showing up, but I can see the text. What am I missing here?
https://jsfiddle.net/fuL5doja/46/
function createNodes(){
var parent = document.getElementById('chart');
var child = document.createElement('div');
child.classList.add('childContainer');
parent.appendChild(child);
var svg = document.createElement('svg');
svg.id = 'donut';
child.appendChild(svg);
}
function donutChart(){
// set the dimensions and margins of the graph
var width = 30
height = 30
margin = 0
// The radius of the pieplot is half the width or half the height (smallest one). I subtract a bit of margin.
var radius = 30
// append the svg object to the div called 'my_dataviz'
var svg = d3.select('#donut')
.attr("width", width)
.attr("height", height)
.append("g")
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
// Create dummy data
var dataDummy = {a: 70, b:30}
// set the color scale
var color = d3.scale.ordinal()
.domain(dataDummy)
.range(["#bebfc2", "#8FB91C"])
// Compute the position of each group on the pie:
var pie = d3.layout.pie()
.value(function(d) {return d.value; })
var data_ready = pie(d3.entries(dataDummy))
// Build the pie chart: Basically, each part of the pie is a path that we build using the arc function.
svg.selectAll('whatever')
.data(data_ready)
.enter()
.append('path')
.attr('d', d3.svg.arc()
.innerRadius(5) // This is the size of the donut hole
.outerRadius(radius)
)
.attr('fill', function(d){ return(color(d.data.key)) })
.style("opacity", 0.7)
svg.append("text")
.attr("x", -12) // space legend
.attr("y", 2)
.attr("class", "donutText")
.text('30%');
}
function donutChart2(){
// set the dimensions and margins of the graph
var width = 30
height = 30
margin = 0
// The radius of the pieplot is half the width or half the height (smallest one). I subtract a bit of margin.
var radius = 30
// append the svg object to the div called 'my_dataviz'
var svg = d3.select('#test')
.attr("width", width)
.attr("height", height)
.append("g")
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
// Create dummy data
var dataDummy = {a: 70, b:30}
// set the color scale
var color = d3.scale.ordinal()
.domain(dataDummy)
.range(["#bebfc2", "#8FB91C"])
// Compute the position of each group on the pie:
var pie = d3.layout.pie()
.value(function(d) {return d.value; })
var data_ready = pie(d3.entries(dataDummy))
// Build the pie chart: Basically, each part of the pie is a path that we build using the arc function.
svg.selectAll('whatever')
.data(data_ready)
.enter()
.append('path')
.attr('d', d3.svg.arc()
.innerRadius(5) // This is the size of the donut hole
.outerRadius(radius)
)
.attr('fill', function(d){ return(color(d.data.key)) })
.style("opacity", 0.7)
svg.append("text")
.attr("x", -12) // space legend
.attr("y", 2)
.attr("class", "donutText")
.text('30%');
}
createNodes();
donutChart();
donutChart2();
.childContainer {
width: 200px;
height: 100px;
border: 1px solid black;
}
#mySvg {
}
<div id="chart"></div>
<svg id="test"></svg>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.1/moment.min.js" integrity="sha512-qTXRIMyZIFb8iQcfjXWCO8+M5Tbc38Qi5WzdPOYZHIlZpzBHG3L3by84BBBOiRGiEb7KKtAOAs5qYdUiZiQNNQ==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
You need to create the svg element with svg namespace uri for it to support path when creating directly with JavaScript:
var svg = document.createElementNS('http://www.w3.org/2000/svg','svg');
Instead of just the typical
var svg = document.createElement('svg');
Alternatively, you could use D3 to append the svg, which will make sure it's correctly namespaced!
d3.select(child).append('svg').attr('id', 'donut');

Creating a zoom function in D3

I have a function where that when a button is pressed (Several buttons the represent several animal types), that animal types SVG is updated with its corresponding data. I'm trying to replicate this zoom function but am having issues implementing it with my code. There are several SVGs that are used globally like this (one for each animal type):
let x = d3.scaleLinear()
.domain([0, 1000])
.range([ 0, width ]);
var xAxis = d3.axisBottom(x);
svgReptile.append("g")
.attr("transform", "translate(0," + height + ")")
.call(xAxis)
const yAxis = d3.scaleLinear()
.domain([0, 220])
.range([ height, 0])
svgReptile.append("g")
.call(d3.axisLeft(yAxis))
The function below is called when one of the animal buttons is pressed.
function update(animal, whatSVG, xAxis, yAxis, color) {
const points = whatSVG
.selectAll("circle")
.data(data);
points.enter()
.append("circle")
.attr("cx", function(d) {
return xAxis(d.state);
})
.attr("cy", function(d) {
return yAxis(d.percentage);
})
.merge(points)
.attr("r", 3)
.attr("cx", function(d) {
return xAxis(d.decade)
})
.attr("cy", function(d) {
return yAxis(d.count)
})
.style("fill", function (d) { return colour(d.animal) } );
points.exit()
.attr('r', 0)
.remove();
}
Question:
How can I implement a zoom feature that expands the x-axis when zoomed (or anything similar) like the one linked above?
I think you're looking for a 'brush zoom' from the last line of your question.
The following source code if from an example in a d3 graph gallery
The cross hair allows you to select an area to expand. If you follow the link there is a graph above it that is entitled "Zoom with axis" but it doesn't zoom in the way you've described, it just moves the axis, but doesn't enlarge the graph contents with it. Perhaps both will be useful!
Hope this helps
// set the dimensions and margins of the graph
var margin = {top: 10, right: 20, bottom: 20, left: 20},
width = 500 - margin.left - margin.right,
height = 400 - margin.top - margin.bottom;
// append the svg object to the body of the page
var Svg = d3.select("#brushZoom")
.append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform",
"translate(" + margin.left + "," + margin.top + ")");
//Read the data
d3.csv("https://raw.githubusercontent.com/holtzy/D3-graph-gallery/master/DATA/iris.csv", function(data) {
// Add X axis
var x = d3.scaleLinear()
.domain([4, 8])
.range([ 0, width ]);
var xAxis = Svg.append("g")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x));
// Add Y axis
var y = d3.scaleLinear()
.domain([0, 9])
.range([ height, 0]);
Svg.append("g")
.call(d3.axisLeft(y));
// Add a clipPath: everything out of this area won't be drawn.
var clip = Svg.append("defs").append("svg:clipPath")
.attr("id", "clip")
.append("svg:rect")
.attr("width", width )
.attr("height", height )
.attr("x", 0)
.attr("y", 0);
// Color scale: give me a specie name, I return a color
var color = d3.scaleOrdinal()
.domain(["setosa", "versicolor", "virginica" ])
.range([ "#440154ff", "#21908dff", "#fde725ff"])
// Add brushing
var brush = d3.brushX() // Add the brush feature using the d3.brush function
.extent( [ [0,0], [width,height] ] ) // initialise the brush area: start at 0,0 and finishes at width,height: it means I select the whole graph area
.on("end", updateChart) // Each time the brush selection changes, trigger the 'updateChart' function
// Create the scatter variable: where both the circles and the brush take place
var scatter = Svg.append('g')
.attr("clip-path", "url(#clip)")
// Add circles
scatter
.selectAll("circle")
.data(data)
.enter()
.append("circle")
.attr("cx", function (d) { return x(d.Sepal_Length); } )
.attr("cy", function (d) { return y(d.Petal_Length); } )
.attr("r", 8)
.style("fill", function (d) { return color(d.Species) } )
.style("opacity", 0.5)
// Add the brushing
scatter
.append("g")
.attr("class", "brush")
.call(brush);
// A function that set idleTimeOut to null
var idleTimeout
function idled() { idleTimeout = null; }
// A function that update the chart for given boundaries
function updateChart() {
extent = d3.event.selection
// If no selection, back to initial coordinate. Otherwise, update X axis domain
if(!extent){
if (!idleTimeout) return idleTimeout = setTimeout(idled, 350); // This allows to wait a little bit
x.domain([ 4,8])
}else{
x.domain([ x.invert(extent[0]), x.invert(extent[1]) ])
scatter.select(".brush").call(brush.move, null) // This remove the grey brush area as soon as the selection has been done
}
// Update axis and circle position
xAxis.transition().duration(1000).call(d3.axisBottom(x))
scatter
.selectAll("circle")
.transition().duration(1000)
.attr("cx", function (d) { return x(d.Sepal_Length); } )
.attr("cy", function (d) { return y(d.Petal_Length); } )
}
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.13.0/d3.min.js"></script>
<div id="brushZoom"></div>

d3 how to tie text to top right corner of view port while zooming and panning

I am creating a mapping application in d3 and want to tie some text to the top right corner of my view port. Additionally, I want the text to remain in the top right corner while I zoom and pan across the application.I think I can solve my problem by figuring out how to get the coordinates of the top right corner of my view. Knowing this information would allow me to then set the coordinates of my text element. I've tried manually setting the dimensions of the containing svg element and then moving the text to that location but interestingly this didn't work. I was hoping to be able to find the coordinates programatically rather than setting coordinates manually. How can I do this in d3/javascript?
EDIT:
My code is a modification of this code by Andy Barefoot: https://codepen.io/nb123456/pen/zLdqvM
My own zooming and panning code has essentially remained the same as the above example:
function zoomed() {
t = d3
.event
.transform
;
countriesGroup
.attr("transform","translate(" + [t.x, t.y] + ")scale(" + t.k + ")")
;
}
I'm trying to append the text at the very bottom of the code:
countriesGroup.append("text")
.attr("transform", "translate(" How do I get top right coordinates? ")")
.style("fill", "#ff0000")
.attr("font-size", "50px")
.text("This is a test");
My idea is to be able to get the top right coordinates of the view port through the code rather than setting it manually and then have the coordinates of the text update as the user zooms or pans.
To keep something in place while zooming and panning you could invert the zoom:
point == invertZoom(applyZoom(point))
This isn't particularly efficient, as we are using two operations to get to the original number. The zoom is applied here:
countriesGroup
.attr("transform","translate(" + [t.x, t.y] + ")scale(" + t.k + ")");
While the inversion would need to look something like:
text.attr("x", d3.zoom.transform.invert(point)[0])
.attr("y", d3.zoom.transform.invert(point)[1])
.attr("font-size", baseFontSize / d3.zoom.transform.k);
Where point and base font size are the original anchor point and font size. This means storing that data somewhere. In the example below I assign it as a datum to the text element:
var width = 500;
var height = 200;
var data = d3.range(100).map(function() {
return {x:Math.random()*width,y:Math.random()*height}
})
var zoom = d3.zoom()
.on("zoom",zoomed);
var svg = d3.select("body")
.append("svg")
.attr("width",width)
.attr("height",height)
.call(zoom);
var g = svg.append("g")
var circles = g.selectAll()
.data(data)
.enter()
.append("circle")
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; })
.attr("r", 5)
.attr("fill","steelblue")
var text = g.append("text")
.datum({x: width-10, y: 20, fontSize: 12})
.attr("x", function(d) { return d.x; })
.attr("y", function(d) { return d.y; })
.style("text-anchor","end")
.attr("font-size",function(d) { return d.fontSize; })
.text("This is a test");
function zoomed() {
g.attr("transform", d3.event.transform);
var d = text.datum();
var p = d3.event.transform.invert([d.x,d.y]);
var x1 = p[0];
var y1 = p[1];
text.attr("x",x1)
.attr("y",y1)
.attr("font-size", d.fontSize / d3.event.transform.k)
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.10.0/d3.min.js"></script>
Better Solution
The above is the solution to the approach you seem to be looking for. But the end result is best achieved by a different method. As I mention in my comment, the above approach goes through extra steps that can be avoided. There can also be some size/clarity changes in the text when zooming (quickly) using the above method
As noted above, you are applying the zoom here:
countriesGroup
.attr("transform","translate(" + [t.x, t.y] + ")scale(" + t.k + ")")
The zoom transform is applied only to countriesGroup, if your label happens to be in a different g (and not a child of countriesGroup), it won't be scaled or panned.
We wouldn't need to apply and invert the zoom, and we wouldn't need to update the position or font size of the text at all.
var width = 500;
var height = 200;
var data = d3.range(100).map(function() {
return {x:Math.random()*width,y:Math.random()*height}
})
var zoom = d3.zoom()
.on("zoom",zoomed);
var svg = d3.select("body")
.append("svg")
.attr("width",width)
.attr("height",height)
.call(zoom);
var g = svg.append("g");
var g2 = svg.append("g"); // order does matter in layering
var circles = g.selectAll()
.data(data)
.enter()
.append("circle")
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; })
.attr("r", 5)
.attr("fill","steelblue")
// position once and leave it alone:
var text = g2.append("text")
.attr("x", width - 10)
.attr("y", 20 )
.style("text-anchor","end")
.attr("font-size", 12)
.text("This is a test");
function zoomed() {
// apply the zoom to the g that has zoomable content:
g.attr("transform", d3.event.transform);
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.10.0/d3.min.js"></script>

Wrong point of origin reference

I'm facing problem with wrong point of origin when multiple elements are added to an SVG.
JSFiddle: https://jsfiddle.net/sbc6ejeu/2/
I've added an SVG and associated path and couple of circles to it. They seem to correspond to the correct origin. However when I move the slider, I expect the circle of id=movingCicle (as mentioned in the code) to move along the green curve (line). I'm unable to start the initial
position of the circle to the same origin as other svg elements.
Also I observe that the range of the red circle is not same as the other elements or the SVG to which it is appended. For the 2nd and 3rd drop down options, the red cicle moves out of the graph when the slider is increased. I feel I'm missing out on something.
Appretiate any help on this.Thanks!
function initialize() {
// Add circle data
jsonCircles = [{
"xAxis": 50,
"yAxis": 154
}, {
"xAxis": 150,
"yAxis": 154
}];
// Set the dimensions of the canvas / graph
var margin = {
top: 30,
right: 20,
bottom: 30,
left: 50
};
width = 600 - margin.left - margin.right;
height = 270 - margin.top - margin.bottom;
// Set the ranges
x = d3.scale.linear().range([0, width]);
y = d3.scale.linear().range([height, 0]);
// Define the axes
xAxis = d3.svg.axis().scale(x)
.orient("bottom").ticks(10);
yAxis = d3.svg.axis().scale(y)
.orient("left").ticks(7);
valueLine = d3.svg.line()
.x(function(d, i) {
return x(i);
})
.y(function(d) {
return y(d);
});
// Adds the svg canvas
svg = d3.select("#graph")
.append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.attr("id", "svg1")
.append("g")
.attr("transform",
"translate(" + margin.left + "," + margin.top + ")");
}
function updateCirclePosition(i) {
d3.select("#movingCircle").remove();
svg.append("circle")
.attr("cx", +i)
.attr("cy", yValues[i])
.attr("r", 5)
.attr("id", "movingCircle")
.style("fill", "red");
}
function addSvgElements() {
// Add the valueline path.
var path = svg.append("path")
.attr("class", "line")
.attr("id", "lineId")
.attr("d", valueLine(yValues));
}
Inside the function updateCirclePosition, the variable i contains the value of the budget, and yValues[i] is the corresponding revenue.
The corresponding coordinates in the chart can be found using x and y functions, therefore x(i) and y(yValues[i]) should be used to set the correct cx and cy:
svg.append("circle")
.attr("cx", x(i))
.attr("cy", y(yValues[i]))
updated fiddle: https://jsfiddle.net/sbc6ejeu/5/

Is this approach right of making a heatmap matrix

I need a heatmap matrix like this,
Now I tried using D3.js, I am able to make matrix and also made it zoomable too, but now I am stuck at adding Notes to rectangles as SVG doesn't supports it.
Am I on right track or can I use Div and jQuery instead to develop this heatmap, I visited hundreds of plugins but non satisfies my needs.
Proper matrix - http://jsfiddle.net/nhe613kt/49/
Trying adding Notes with one rectangle - http://jsfiddle.net/nhe613kt/60
Can I use any other plugin or simple HTML ?
var width = 600,
height = 600;
var margin = {top: -5, right: -5, bottom: -5, left: -5};
var zoom = d3.behavior.zoom()
.scaleExtent([1, 15])
.on("zoom", zoomed);
var svgContainer = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height)
.style("background-color", "black")
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.right + ")")
.call(zoom);
var zoomed = function () {
svgContainer.attr("transform", "translate("+ d3.event.translate + ")scale(" + d3.event.scale + ")");
};
var zoom = d3.behavior.zoom()
.scaleExtent([1, 8])
.on("zoom", zoomed)
.size([width, height]);
svgContainer.call(zoom);
var rectangle1 = svgContainer.append("rect")
.attr("x", 0)
.attr("y", 0)
.attr("width", 100)
.attr("height", 100)
.attr("fill", "red")
.append("text")
.text("Hahaha");
You need to configure the text node properly:
svgContainer.append("text")
.attr("x", 10)
.attr("y", 20)
.attr("fill", "blue")
.text("Hahaha");
Otherwise, it might be outside of the visible are (y=0 is a common mistake; the Y coordinate moves the baseline of the text, not the top-right corner). Also without a color, the text will inherit one from the parent.
Demo: http://jsfiddle.net/nhe613kt/65/

Categories

Resources