bd028579
 易尊强
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import smoothBezier from './smoothBezier';
import { VectorArray } from '../../core/vector';
import PathProxy from '../../core/PathProxy';
export function buildPath(
ctx: CanvasRenderingContext2D | PathProxy,
shape: {
points: VectorArray[],
smooth?: number
smoothConstraint?: VectorArray[]
},
closePath: boolean
) {
const smooth = shape.smooth;
let points = shape.points;
if (points && points.length >= 2) {
if (smooth) {
const controlPoints = smoothBezier(
points, smooth, closePath, shape.smoothConstraint
);
ctx.moveTo(points[0][0], points[0][1]);
const len = points.length;
for (let i = 0; i < (closePath ? len : len - 1); i++) {
const cp1 = controlPoints[i * 2];
const cp2 = controlPoints[i * 2 + 1];
const p = points[(i + 1) % len];
ctx.bezierCurveTo(
cp1[0], cp1[1], cp2[0], cp2[1], p[0], p[1]
);
}
}
else {
ctx.moveTo(points[0][0], points[0][1]);
for (let i = 1, l = points.length; i < l; i++) {
ctx.lineTo(points[i][0], points[i][1]);
}
}
closePath && ctx.closePath();
}
}
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