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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Path to Bezier</title>
<script src="https://cdn.jsdelivr.net/npm/dat.gui@0.7.6/build/dat.gui.js"></script>
<script src="lib/config.js"></script>
</head>
<body>
<style>
html, bod {
width: 100%;
height: 100%;
margin: 0;
}
</style>
<canvas id="main" width="1600" height="1600"></canvas>
<script type="importmap">
{
"imports": {
"zrender/": "../",
"tslib": "../node_modules/tslib/tslib.es6.js"
}
}
</script>
<script type="module">
import Sector from "zrender/lib/graphic/shape/Sector.js";
import PathProxy from "zrender/lib/core/PathProxy.js";
import {pathToBezierCurves, pathToPolygons} from "zrender/lib/tool/convertPath.js";
import {alignBezierCurves} from "zrender/lib/tool/morphPath.js";
const canvas = document.querySelector('#main');
const ctx = canvas.getContext('2d');
const R = 20;
const G = 50;
const config = {
startAngle: 0
}
function drawPolygon(data) {
ctx.beginPath();
ctx.moveTo(data[0], data[1])
for (let i = 2; i < data.length;) {
ctx.lineTo(data[i++], data[i++]);
}
}
function drawBezier(data) {
ctx.beginPath();
for (let i = 0; i < data.length;) {
i === 0 && ctx.moveTo(data[i++], data[i++]);
ctx.bezierCurveTo(data[i++], data[i++], data[i++], data[i++], data[i++], data[i++]);
}
}
// We choose the most complex sector path to test.
function buildSector() {
for (let k = 0; k < 4; k++) {
for (let i = 0; i < 20; i++) {
const sign = 1 - (k % 2) * 2;
const endAngle = config.startAngle + (Math.PI * 2 * (1 - i / 10));
const cx = i * G + G;
const cy = G + k * G * 3;
const r = R;
const anticlockwise = k < 2;
// const circleArgs = [x * G + G, G + k * G * 2, R, startAngle, endAngle, k < 2];
// const circlePath = new PathProxy();
// circlePath.beginPath();
// circlePath.arc.apply(circlePath, circleArgs);
const sector = new Sector({
shape: {
cx, cy, r, startAngle: config.startAngle, endAngle,
clockwise: !anticlockwise,
r0: r / 2
}
});
sector.createPathProxy();
sector.buildPath(sector.path, sector.shape);
ctx.beginPath();
sector.path.rebuildPath(ctx);
ctx.strokeStyle = 'green';
ctx.lineWidth = 2;
ctx.stroke();
ctx.fillStyle = 'rgba(0,0,0,0.2)'
const arr = pathToBezierCurves(sector.path);
ctx.save();
ctx.translate(0, G);
ctx.strokeStyle = 'red';
drawBezier(arr[0]);
ctx.stroke();
ctx.fill();
ctx.restore();
const polygon = pathToPolygons(sector.path);
ctx.save();
ctx.translate(0, G * 2);
ctx.strokeStyle = 'blue';
drawPolygon(polygon[0]);
ctx.stroke();
ctx.fill();
ctx.restore();
}
}
}
function buildPolygon() {
for (let k = 0; k < 20; k++) {
const polygonPoints = [];
const N = k + 3;
const dStep = 2 * Math.PI / N;
for (let i = 0; i < N; i++) {
polygonPoints.push(
[k * G + G + Math.cos(i * dStep) * R, G * 14 + Math.sin(i * dStep) * R]
);
}
const polygonPath = new PathProxy();
for (let i = 0; i < polygonPoints.length; i++) {
const x = polygonPoints[i][0];
const y = polygonPoints[i][1];
i === 0 ? polygonPath.moveTo(x, y) : polygonPath.lineTo(x, y);
}
polygonPath.closePath();
const arr = pathToBezierCurves(polygonPath);
ctx.beginPath();
ctx.strokeStyle = 'green';
ctx.lineWidth = 2;
for (let i = 0; i < polygonPoints.length; i++) {
const x = polygonPoints[i][0];
const y = polygonPoints[i][1];
i === 0 ? ctx.moveTo(x, y) : ctx.lineTo(x, y);
}
ctx.closePath();
ctx.stroke();
ctx.fillStyle = 'rgba(0,0,0,0.2)'
ctx.save();
ctx.translate(0, G);
ctx.strokeStyle = 'red';
ctx.lineWidth = 1;
drawBezier(arr[0]);
ctx.stroke();
ctx.fill();
ctx.restore();
const polygon = pathToPolygons(polygonPath);
ctx.save();
ctx.translate(0, G * 2);
ctx.strokeStyle = 'blue';
drawPolygon(polygon[0]);
ctx.stroke();
ctx.fill();
ctx.restore();
}
}
function update() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
buildSector();
buildPolygon();
}
const gui = new dat.GUI();
gui.add(config, 'startAngle', -10, 10).onChange(update)
update();
</script>
</body>
</html>
|
