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31 lines
1.1 KiB
31 lines
1.1 KiB
import { HachureFiller } from './hachure-filler';
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import { polygonHachureLines } from './scan-line-hachure';
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import { lineLength } from '../geometry';
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export class ZigZagFiller extends HachureFiller {
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fillPolygons(polygonList, o) {
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let gap = o.hachureGap;
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if (gap < 0) {
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gap = o.strokeWidth * 4;
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}
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gap = Math.max(gap, 0.1);
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const o2 = Object.assign({}, o, { hachureGap: gap });
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const lines = polygonHachureLines(polygonList, o2);
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const zigZagAngle = (Math.PI / 180) * o.hachureAngle;
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const zigzagLines = [];
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const dgx = gap * 0.5 * Math.cos(zigZagAngle);
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const dgy = gap * 0.5 * Math.sin(zigZagAngle);
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for (const [p1, p2] of lines) {
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if (lineLength([p1, p2])) {
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zigzagLines.push([
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[p1[0] - dgx, p1[1] + dgy],
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[...p2],
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], [
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[p1[0] + dgx, p1[1] - dgy],
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[...p2],
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]);
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}
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}
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const ops = this.renderLines(zigzagLines, o);
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return { type: 'fillSketch', ops };
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}
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}
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