With d3.js I have created d3 dendrograms to visualize hierachicals relations between objects. Dimensions and margins of the graph are defined with fixed height and width values.
var width = 1000,
height = 800,
boxWidth = 150,
boxHeight = 35,
gap = {
width: 50,
height: 12
},
margin = {
top: 16,
right: 16,
bottom: 16,
left: 16
},
svg;
With a few relations, display is ok but with many relations it's doesn't fit, graph is 'cut' and I can't see the entire graph. How to set this width and height properties dynamically and adjusted to the size of the graph ?
An example with a correct display : Codepen
An example with an incorrect display : Codepen
Let's work this out, you need to know the bounding box of your content first and then adjust the svg size. To do that, in this particular case, you only have to look at the boxes or nodes and can ignore the links.
With that in mind you can do the following after populating the Nodes in your renderRelationshipGraph function and return the calculated value:
function renderRelationshipGraph(data) {
// ...
var bbox = Nodes.reduce(function (max, d)
{
var w = d.x + boxWidth;
var h = d.y + boxHeight;
if (w > max[0]) {max[0] = w}
if (h > max[1]) {max[1] = h}
return max
}, [0,0])
return bbox
}
then on the main code change use it to update height and width of the svg:
svg = d3.select("#tree").append("svg")
.attr("width", width)
.attr("height", height);
svg.append("g");
var bbox = renderRelationshipGraph(data);
svg.attr("width", bbox[0])
.attr("height", bbox[1]);
You can add a transition and limit the height but this does what you requested with a really large end result.
Related
I'm learning to make charts in d3 from scratch without taking someone else code and modifying it. I can successfully create a x & y axis vertical bar chart. But when it comes to transform the same chart to horizontal bar chart I end up in a mess. Here is my code so far:
var data = [{
name: "China",
value: 1330141295
}, {
name: "India",
value: 1173108018
}, {
name: "Indonesia",
value: 242968342
}, {
name: "Russia",
value: 139390205
}];
//set margins
var margin = {
top: 30,
right: 30,
bottom: 30,
left: 40
};
var width = 960 - margin.left - margin.right;
var height = 600 - margin.top - margin.bottom;
//set scales & ranges
var yScale = d3.scaleBand().range([0, height]).padding(0.1)
var xScale = d3.scaleLinear().range([0, width])
//draw the svg
var svg = d3.select("#chart").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom).append("g")
.attr("transform", "translate(" + margin.left * 2 + "," + margin.top + ")")
//load the data
data.forEach(function(d) {
d.population = +d.population;
});
//set domains
xScale.domain([0, d3.max(data, function(d) {
return d.population
})])
yScale.domain(data.map(d => d.name))
//add x & y Axis
svg.append("g")
.attr("transform", "translate(" + 0 + "," + height + ")")
.call(d3.axisBottom(xScale));
svg.append("g")
.call(d3.axisLeft(yScale))
.selectAll("rect")
.data(data)
.enter()
.append("rect")
.attr("y", d => yScale(d.name))
.attr("height", d => yScale(d.name))
.attr("x", d => width - xScale(d.population))
.attr("width", yScale.bandwidth())
Thank you very much.
You need to change a lot of things in your code.
TL;DR
change value to population in the array
scales are used to convert values to proportional pixel values
height is the vertical size of an element. you should use yScale(d.name)
width is the horizontal size of an element. you should use xScale(d.population)
y is the vertical position of an element. you should use yScale.bandwidth()
x is the vertical position of an element. you should use 0
use selectAll("rect") on a new appended g or the svg element not the same g element that has the axises on it
add fill attribute so that your rects have color
You have the population field labelled value but you're calling population through out the code to use it. So replace value with population in your data objects.
Next you need to change the way you're setting up the rects. use selectAll on the svg element directly or append another g to the svg element and add the rects on that element. Right now your code attempts to add the rects to the same g element as the x axis.
Make sure you are setting the attributes of the rects correctly. Height is the size in pixels of the rect element not the position. y is the position of the rects vertically from the top downwards. this means the height attribute should use yScale(d.name) and width should use xScale(d.population) because they are the width and length of the rectangles, or rect elements. x and y are the coordinate positions of the element from the top left corner of the svg element. Use them to determine the starting position of the top left pixel of your rects. You should have y as yScale.bandwidth() and x as 0.
I dynamically am changing the data for a Tree Diagram, and don't know what the height of the SVG should be. How can I calculate the height of the Tree Diagram to update the SVG dimensions?
Fiddle example: https://jsfiddle.net/intelligence_ai/guesukv6/
Please view the code on the fiddle, SO requires that I post some code with fiddle links:
var treemap = d3.tree().nodeSize([40, 40]);
root = d3.hierarchy(data, function(d) { return d.children; });
root.x0 = 100;
root.y0 = 0;
function update(source) {
// Assigns the x and y position for the nodes
var data = treemap(root);
// Compute the new tree layout.
var nodes = data.descendants(),
links = data.descendants().slice(1);
// Normalize for fixed-depth.
let connectorLength = 200; // the length of the lines in pixels
nodes.forEach(function(d){ d.y = d.depth * connectorLength});
nodes = nodes.filter(function(d){
return d.depth != 0;
})
...
Since you specified that the nodeSize is [40,40] and you have 129 nodes, the height should be:
var height = 40 * 129;
Since you want to calculate it dynamically, it should be:
var height = treemap.nodeSize()[1] * nodes.length;
Also, when specifying tree.nodeSize the root node will be positioned at 0,0. Therefore, you have to translate the main group:
.attr("transform", "translate("+ margin.left + "," + (height/2) + ")");
Here is the updated fiddle: https://jsfiddle.net/jxw0Ld3c/
I am struggling to keep the area graph inbounds for a particular set of data. I am not able to figure out what exactly is making it go out of range
var xRange = d3.scale.linear().range([MARGINS.left, WIDTH - MARGINS.right]).domain([0, numberOfDays + 1]),
yRange = d3.scale.linear().range([HEIGHT - MARGINS.top, MARGINS.bottom]).domain([_.min(areaData), _.max(areaData)]);
js fiddle here
https://jsfiddle.net/sahils/o7df3tyn/20/
Its due to you setting them exactly so these lines :
<svg id="visualisation" width="1200" height="400"></svg>
And
WIDTH = 1000,
HEIGHT = 400,
Rather than this just use window size :
var WIDTH = window.innerWidth,
HEIGHT = window.innerHeight,
vis = d3.select('#visualisation').attr('width', WIDTH).attr('height', HEIGHT)
And remove the styling from your html. Updated fiddle : https://jsfiddle.net/thatOneGuy/o7df3tyn/23/
I am looking to implement ggplot2 type of graphs using d3.js library for interactivey purpose. I love ggplot2 but users are interested in interactive graphs. I've been exploring d3.js library and there seems to be lots of different graph capability but I really did not see any statistical graphs like linear line, forecast etc. Given a scatter plot, is it possible to also add linear line to the graph.
I have this sample script that draws scatter plot. How would I add linear line to this graph in d3.js?
// data that you want to plot, I've used separate arrays for x and y values
var xdata = [5, 10, 15, 20],
ydata = [3, 17, 4, 6];
// size and margins for the chart
var margin = {top: 20, right: 15, bottom: 60, left: 60}
, width = 960 - margin.left - margin.right
, height = 500 - margin.top - margin.bottom;
// x and y scales, I've used linear here but there are other options
// the scales translate data values to pixel values for you
var x = d3.scale.linear()
.domain([0, d3.max(xdata)]) // the range of the values to plot
.range([ 0, width ]); // the pixel range of the x-axis
var y = d3.scale.linear()
.domain([0, d3.max(ydata)])
.range([ height, 0 ]);
// the chart object, includes all margins
var chart = d3.select('body')
.append('svg:svg')
.attr('width', width + margin.right + margin.left)
.attr('height', height + margin.top + margin.bottom)
.attr('class', 'chart')
// the main object where the chart and axis will be drawn
var main = chart.append('g')
.attr('transform', 'translate(' + margin.left + ',' + margin.top + ')')
.attr('width', width)
.attr('height', height)
.attr('class', 'main')
// draw the x axis
var xAxis = d3.svg.axis()
.scale(x)
.orient('bottom');
main.append('g')
.attr('transform', 'translate(0,' + height + ')')
.attr('class', 'main axis date')
.call(xAxis);
// draw the y axis
var yAxis = d3.svg.axis()
.scale(y)
.orient('left');
main.append('g')
.attr('transform', 'translate(0,0)')
.attr('class', 'main axis date')
.call(yAxis);
// draw the graph object
var g = main.append("svg:g");
g.selectAll("scatter-dots")
.data(ydata) // using the values in the ydata array
.enter().append("svg:circle") // create a new circle for each value
.attr("cy", function (d) { return y(d); } ) // translate y value to a pixel
.attr("cx", function (d,i) { return x(xdata[i]); } ) // translate x value
.attr("r", 10) // radius of circle
.style("opacity", 0.6); // opacity of circle
To add a line to your plot, all that you need to do is to append some line SVGs to your main SVG (chart) or to the group that contains your SVG elements (main).
Your code would look something like the following:
chart.append('line')
.attr('x1',x(10))
.attr('x2',x(20))
.attr('y1',y(5))
.attr('y2',y(10))
This would draw a line from (10,5) to (20,10). You could similarly create a data set for your lines and append a whole bunch of them.
One thing you might be interested in is the SVG path element. This is more common for lines than drawing one straight segment at a time. The documentation is here.
On another note you may find it easier to work with data in d3 if you create it all as one object. For example, if your data was in the following form:
data = [{x: 5, y:3}, {x: 10, y:17}, {x: 15, y:4}, {x: 20, y:6}]
You could use:
g.selectAll("scatter-dots")
.data(ydata) // using the values in the ydata array
.enter().append("svg:circle") // create a new circle for each value
.attr("cy", function (d) { return y(d.y); } ) //set y
.attr("cx", function (d,i) { return x(d.x); } ) //set x
This would eliminate potentially messy indexing if your data gets more complex.
UPDATE: Here is the relevant block: https://bl.ocks.org/HarryStevens/be559bed98d662f69e68fc8a7e0ad097
I wrote this function to calculate a linear regression from data, formatted as JSON.
It takes 5 parameters:
1) Your data
2) The column name of the data plotted on your x-axis
3) The column name of the data plotted on your y-axis
4) The minimum value of your x-axis
5) The minimum value of your y-axis
I got the formula for calculating a linear regression from http://classroom.synonym.com/calculate-trendline-2709.html
function calcLinear(data, x, y, minX, minY){
/////////
//SLOPE//
/////////
// Let n = the number of data points
var n = data.length;
var pts = [];
data.forEach(function(d,i){
var obj = {};
obj.x = d[x];
obj.y = d[y];
obj.mult = obj.x*obj.y;
pts.push(obj);
});
// Let a equal n times the summation of all x-values multiplied by their corresponding y-values
// Let b equal the sum of all x-values times the sum of all y-values
// Let c equal n times the sum of all squared x-values
// Let d equal the squared sum of all x-values
var sum = 0;
var xSum = 0;
var ySum = 0;
var sumSq = 0;
pts.forEach(function(pt){
sum = sum + pt.mult;
xSum = xSum + pt.x;
ySum = ySum + pt.y;
sumSq = sumSq + (pt.x * pt.x);
});
var a = sum * n;
var b = xSum * ySum;
var c = sumSq * n;
var d = xSum * xSum;
// Plug the values that you calculated for a, b, c, and d into the following equation to calculate the slope
// m = (a - b) / (c - d)
var m = (a - b) / (c - d);
/////////////
//INTERCEPT//
/////////////
// Let e equal the sum of all y-values
var e = ySum;
// Let f equal the slope times the sum of all x-values
var f = m * xSum;
// Plug the values you have calculated for e and f into the following equation for the y-intercept
// y-intercept = b = (e - f) / n = (14.5 - 10.5) / 3 = 1.3
var b = (e - f) / n;
// return an object of two points
// each point is an object with an x and y coordinate
return {
ptA : {
x: minX,
y: m * minX + b
},
ptB : {
y: minY,
x: (minY - b) / m
}
}
}
i'm trying to somehow sweep in a half-donut-chart, meaning starting with a blank screen the chart starts drawing at -90 degree (or 270) and performs a halfcircle until reaching 90 degree. the code looks like:
var width = 800;
var height = 400;
var radius = 300;
var grad=Math.PI/180;
var data = [30, 14, 4, 4, 5];
var color = d3.scale.category20();
var svg = d3.select("body").append("svg").attr("width", width).attr("height",
`height).append("g").attr("transform", "translate(" + radius*1.5 + "," + radius*1.5 +
")");
var arc = d3.svg.arc().innerRadius(radius - 100).outerRadius(radius - 20);
var pie = d3.layout.pie().sort(null);
svg.selectAll("path").data(pie(data)).enter().append("path").attr("d",
arc).attr("fill",
function(d, i) { return color(i); }).transition().duration(500).attrTween("d", sweep);
function sweep(a) {
var i = d3.interpolate({startAngle: -90*grad, endAngle: -90*grad},{startAngle: -90*grad, endAngle: 90*grad});
return function(t) {
return arc(i(t));
};
}
looking at several examples i managed to get the animation, however, i fail at binding (or converting) the data to the arc. my feeling is that there is only one path drawn and then it stops.
if i change the interpolation to start/end -90/90 and a, i get different colors but not all of them. adding the start/end-angle to the pie-var gives me a transition where a one-colored-arc is shown at the beginning and then the other parts slide in (which would be correct if there was no arc at the beginning - the proportions also seem a bit wrong). setting the initial color to white does not help because then everything stays white.
i'm afraid i'm missing an obvious point, but so far i'm stuck, maybe someone can point me in the right direction.
after quite some variations and tests it somehow started to work, using these to lines of code:
var pie = d3.layout.pie().sort(null).startAngle(-90*grad).endAngle(90*grad);
var i = d3.interpolate({startAngle: -90*grad, endAngle: -90*grad},a);
one final "problem" was that the height of the svg was too small and so some segments got cut off, so changing it to
var height = 800;
ended my search. thanks for any considerations.
A small typo on the
var svg = d3.select("body").append("svg").attr("width", width).attr("height", `height)
should be:
var svg = d3.select("body").append("svg").attr("width", width).attr("height", height)