pie3d_svg

3D pie chart supports variable heights of diffrent slices and inner radius with transition and auto rotating implemented by SVG.

npm package

npm i @hinkage/pie3d_svg

Example

example video

example/test.js

let el = document.querySelector('.test');
let inst = Pie3D(el);
inst.render({
	data: fakeData(),
	colorArray: [
		'rgba(213, 63, 11, 1.0)',
		'rgba(89, 19, 208, 1.0)',
		'rgba(56, 140, 227, 1.0)',
		'rgba(20, 202, 156, 1.0)',
		'rgba(185, 195, 16, 1.0)',
		'rgba(210, 138, 26, 1.0)',
		'rgba(109, 175, 243, 1.0)',
		'rgba(108, 200, 243, 1.0)'
	],
	x: 300,
	y: 250,
	width: 150,
	height: 80,
	depth: 30,
	depthRange: [20, 60],
	innerRadius: 0.6,
	startAngle: 270,
	enableTransition: true,
	enableAutoRotate: true,
	rotateDuration: 1000,
	rotateInterval: 2000,
	onRotate: function (d, i) {
		console.log('onRotate:', d, i);
	}
});

Two ways

One is seperate slices to 3 groups of inner, outer and top. This way does not need to care the order of elements inside each group, and supports any start angle, but does not support variable height.

Another is treat each part of pie as one group. This needs to care the order of eath part inside the pie. But this way can only permit start angle to be set to 270 degrees.

Config

Look at src/default_config.js.

The default config will be overridden by the object passed to function render. Try to change the value of each property to see what will happend to understand what the property means.

Caution

startAngle can only be set to 270 degrees, because of the limitation of SVG. SVG is designed for 2D graphic, not for 3D graphic like this.

You can try to set startAngle to 0 degrees, then only provide two items of data, click on update button several times, then you can find the problem. No matter which order that two parts are placed, the overlapping result is wrong.

In 3D graphic, each single pixel's distance to camera must be calculated to decide we can see that pixel or not, this is not possible in SVG. This is the biggest limitation of this implementation. The perfect implemetation can only be done by WebGL, which is the real 3D graphic interface.

There is another library: amcharts variable-height-3d-pie-chart-v4.

As I test, It has the same problem as this repository, when the startAngle is set to 0, and endAngle is set 360, and only provide two items of data, it produces the same problem.