如何分别更改d3.js条形图条的颜色并为其缩放？
[英]How do I change the colour of my d3.js Bar Graph bars individually and make a Scale for them?
问题描述
I am currently building a graph which shows data for the Amount of Resources being used Per Project and representing it using a bar graph. 
我目前正在构建一个图形，该图形显示每个项目正在使用的资源量的数据，并使用条形图表示它。 I am currently trying to change the colour of the bars so that each one has it's own specific colour. 我目前正在尝试更改条形的颜色，以便每个条都有其自己的特定颜色。 Currently it is set to scale between 2 blues and pick a colour based on it's length but I would like each one to be 1 of 3 colours. 目前，它设置为在2种蓝色之间缩放，并根据其长度选择一种颜色，但我希望每种颜色都是3种颜色中的1种。 I am also trying to make a legend which shows what each colour represents on said bar graph. 我还试图制作一个图例，以显示每种颜色在条形图上表示的含义。
<!DOCTYPE html> <html> <head> <meta> <meta name="description" content="Drawing Shapes w/ D3 - " /> <meta charset="utf-8"> <title>Resources per Project</title> <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script> <style type="text/css"> h1 { font-size: 35px; color: darkgrey; font-family: Helvetica; border-bottom-width: 3px; border-bottom-style: dashed; border-bottom-color: black; } h2 { font-size: 20px; color: black; font-family: Helvetica; text-decoration: underline; margin-left: 350px; margin-top: 0px; } .label { font-size: 20px; color: darkgrey; font-family: "Arial Black"; border-bottom-width: 3px; border-bottom-style: dashed; border-bottom-color: black; } </style> </head> <body> <h1>Resources used per Project</h1> <p>Choose Month: <select id="label-option"> <option value="April">April</option> <option value="May">May</option> <option value="June">June</option> <option value="July">July</option> <option value="August">August</option> <option value="September">September</option> </select> <script type="text/javascript"> var width = 800 var height = 500 var emptyVar = 0 var dataArrayProjects = ['2G', 'An', 'At', 'Au', 'AW', 'Ch', 'CI', 'CN'] var April = [0.35, 1.66, 3.04, 1.54, 3.45, 2.56, 2.29, 1.37] var May = [0.36, 1.69, 3.08, 1.54, 3.62, 2.61, 2.22, 1.44] var June = [0.34, 1.7, 3.08, 1.63, 3.66, 2.68, 2.24, 1.51] var July = [0.3, 1.72, 3.17, 1.67, 3.56, 2.56, 2.17, 1.44] var August = [0.28, 1.79, 3.18, 1.71, 3.62, 2.73, 2.26, 1.54] var September = [1.23, 1.74, 3.12, 1.61, 3.66, 2.71, 2.2, 1.48] d3.select("#label-option").on("change", change) function change() { var data = April; if (this.selectedIndex == 1){ data = May; } else if (this.selectedIndex == 2){ data = June; } else if (this.selectedIndex == 3){ data = July; } else if (this.selectedIndex == 4){ data = August; } else if (this.selectedIndex == 5){ data = September; } canvas.selectAll("rect") .data(data) .attr("width", emptyVar) .attr("height", 50) .attr("fill", function(d) { return color(d) }) .attr("y", function(d, i) { return i * 55 }) bars.transition() .duration(1500) .delay(200) .attr("width", function(d) { return widthScale(d); }); texts = canvas.selectAll(".label") .data(data) .attr("x", function(d) { return widthScale(d) + 10; }) .attr("fill", function(d) { return color(d) }) .attr("y", function(d, i) { return (i * 55) + 25 }) .style("opacity", 0) .text(function(d, i) { return d; }) texts.transition() .duration(2000) .delay(180) .style("opacity", 1) } var widthScale = d3.scale.linear() .domain([0, 4]) .range([0, width - 60]); var heightScale = d3.scale.ordinal() .domain(dataArrayProjects) .rangePoints([10, height - 85]); var color = d3.scale.linear() .domain([0, 4]) .range(["#000033", "#22cdff"]) var xAxis = d3.svg.axis() .ticks("30") .scale(widthScale); var yAxis = d3.svg.axis() .scale(heightScale) .orient("left"); var canvas = d3.select("body") .append("svg") .attr("width", width) .attr("height", height) .append("g") .attr("transform", "translate(40, 0)"); var bars = canvas.selectAll("rect") .data(April) .enter() .append("rect") .attr("width", emptyVar) .attr("height", 50) .attr("fill", function(d) { return color(d) }) .attr("y", function(d, i) { return i * 55 }) var texts = canvas.selectAll(".label") .data(April) .enter() .append("text") .attr("class", "label") .attr("x", function(d) { return widthScale(d) + 10; }) .attr("fill", function(d) { return color(d) }) .attr("y", function(d, i) { return (i * 55) + 25 }) .text(function(d, i) { return d; }) .style("opacity", 0) canvas.append("g") .attr("transform", "translate(0, 430)") .attr("font-family", "Helvetica") .attr("font-size", "15px") .call(xAxis); canvas.append("g") .attr("font-family", "Helvetica") .attr("font-size", "15px") .style("fill", "black") .attr("class", "y axis") .call(yAxis); bars.transition() .duration(1500) .delay(200) .attr("width", function(d) { return widthScale(d); }) texts.transition() .duration(2000) .delay(180) .style("opacity", 1) var yAxisLine = canvas.append("line") .attr("x1", -3) .attr("y1", 0) .attr("x2", -3) .attr("y2", 436) .attr("stroke-width", 6) .attr("stroke", "black"); </script> <h2>Resources</h2> </body> </html>
How do I set the colour of the bars individually and how do I made a legend using said colours. 如何分别设置条形的颜色，以及如何使用所述颜色制作图例。
Thanks in advance! 提前致谢！
1 个解决方案
解决方案1
2 已采纳 2016-06-29 05:24:42
For changing colors, you have already assigned a variable color and further it is used for filling bars. 为了改变颜色，您已经分配了可变颜色，并且进一步将其用于填充条。
Your code is: 您的代码是：
var color = d3.scale.linear()
.domain([0, 4])
.range(["#000033", "#22cdff"])
Instead initialize with some fixed colors 而是用一些固定的颜色初始化
var color = ["#000033", "#22cdff", "#010101"]
And change code base for assigning it into bar fill: 并更改将其分配给条形填充的代码库：
var bars = canvas.selectAll("rect")
.data(April)
.enter()
.append("rect")
.attr("width", emptyVar)
.attr("height", 50)
.attr("fill", function(d, i) {
return color[i%3] // here it is picking up colors in sequence
})
.attr("y", function(d, i) {
return i * 55
})
var texts = canvas.selectAll(".label")
.data(April)
.enter()
.append("text")
.attr("class", "label")
.attr("x", function(d) {
return widthScale(d) + 10;
})
.attr("fill", function(d, i) {
return color[i%3] // here it is picking up colors in sequence
})
.attr("y", function(d, i) {
return (i * 55) + 25
})
.text(function(d, i) {
return d;
})
.style("opacity", 0)
Colors will be picked from color array. 颜色将从颜色阵列中选取。
And for legends there are many plugins and code available. 对于图例，有许多可用的插件和代码。 you can refer one of my answer 你可以参考我的答案之一
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