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76 lines
1.8 KiB
76 lines
1.8 KiB
export function buildPath(ctx, shape) {
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var x = shape.x;
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var y = shape.y;
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var width = shape.width;
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var height = shape.height;
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var r = shape.r;
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var r1;
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var r2;
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var r3;
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var r4;
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if (width < 0) {
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x = x + width;
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width = -width;
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}
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if (height < 0) {
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y = y + height;
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height = -height;
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}
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if (typeof r === 'number') {
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r1 = r2 = r3 = r4 = r;
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}
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else if (r instanceof Array) {
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if (r.length === 1) {
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r1 = r2 = r3 = r4 = r[0];
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}
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else if (r.length === 2) {
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r1 = r3 = r[0];
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r2 = r4 = r[1];
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}
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else if (r.length === 3) {
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r1 = r[0];
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r2 = r4 = r[1];
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r3 = r[2];
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}
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else {
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r1 = r[0];
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r2 = r[1];
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r3 = r[2];
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r4 = r[3];
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}
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}
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else {
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r1 = r2 = r3 = r4 = 0;
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}
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var total;
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if (r1 + r2 > width) {
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total = r1 + r2;
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r1 *= width / total;
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r2 *= width / total;
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}
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if (r3 + r4 > width) {
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total = r3 + r4;
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r3 *= width / total;
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r4 *= width / total;
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}
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if (r2 + r3 > height) {
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total = r2 + r3;
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r2 *= height / total;
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r3 *= height / total;
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}
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if (r1 + r4 > height) {
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total = r1 + r4;
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r1 *= height / total;
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r4 *= height / total;
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}
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ctx.moveTo(x + r1, y);
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ctx.lineTo(x + width - r2, y);
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r2 !== 0 && ctx.arc(x + width - r2, y + r2, r2, -Math.PI / 2, 0);
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ctx.lineTo(x + width, y + height - r3);
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r3 !== 0 && ctx.arc(x + width - r3, y + height - r3, r3, 0, Math.PI / 2);
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ctx.lineTo(x + r4, y + height);
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r4 !== 0 && ctx.arc(x + r4, y + height - r4, r4, Math.PI / 2, Math.PI);
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ctx.lineTo(x, y + r1);
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r1 !== 0 && ctx.arc(x + r1, y + r1, r1, Math.PI, Math.PI * 1.5);
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}
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