Published
Edited
Dec 6, 2019
md`# JavaScript Pie Radar Chart`
path1 = {
const svg = d3.create('svg');
const diameter = 400;
const radius = diameter / 2;
svg.attr('width', diameter + borderWidth);
svg.attr('height', diameter + borderWidth);
const center = radius + borderWidth;
const axeCount = 3;
const spaceSize = 3;
const pxSpaceSize = 0;
for (let i = 0; i < 17; i ++) {
const currentRadius = radius - (i * 10);
const spaceSize = center * 2 / currentRadius;
createAxes(svg, center, currentRadius, axeCount, spaceSize);
}
return svg.node();
}
function createAxes(svg, center, radius, axeCount, spaceSize){
const axe = 360 / axeCount;
for (let i = 0; i < axeCount; i++){
createCircularOutlinePath(svg, center, radius - borderWidth, axe * i + spaceSize, axe * (i + 1) - spaceSize);
}
}
function createCircularOutlinePath(svg, center, radius, startAngle, endAngle){
const path = svg.append('path');
path.attr('stroke', '#446688');
path.attr('stroke-width', borderWidth);
path.attr('fill', 'none');
path.attr('stroke-linecap', 'round');
path.attr('d', describeArc(center, radius, startAngle, endAngle));
return path;
}
function describeArc(center, radius, startAngle, endAngle){
var start = polarToCartesian(center, radius, endAngle);
var end = polarToCartesian(center, radius, startAngle);
var largeArcFlag = endAngle - startAngle <= 180 ? "0" : "1";
var d = [
"M", start.x, start.y,
"A", radius, radius, 0, largeArcFlag, 0, end.x, end.y
].join(" ");
return d;
}
function polarToCartesian(center, radius, angleInDegrees) {
var angleInRadians = (angleInDegrees-90) * Math.PI / 180.0;
return {
x: center + (radius * Math.cos(angleInRadians)),
y: center + (radius * Math.sin(angleInRadians))
};
}
diameter = 200;
radius = diameter / 2;
borderWidth = 4;
d3 = require('d3')
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