42 lines
1.4 KiB
JavaScript
42 lines
1.4 KiB
JavaScript
import { lineLength } from '../geometry';
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import { polygonHachureLines } from './scan-line-hachure';
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export class DotFiller {
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constructor(helper) {
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this.helper = helper;
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}
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fillPolygons(polygonList, o) {
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o = Object.assign({}, o, { hachureAngle: 0 });
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const lines = polygonHachureLines(polygonList, o);
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return this.dotsOnLines(lines, o);
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}
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dotsOnLines(lines, o) {
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const ops = [];
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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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let fweight = o.fillWeight;
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if (fweight < 0) {
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fweight = o.strokeWidth / 2;
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}
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const ro = gap / 4;
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for (const line of lines) {
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const length = lineLength(line);
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const dl = length / gap;
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const count = Math.ceil(dl) - 1;
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const offset = length - (count * gap);
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const x = ((line[0][0] + line[1][0]) / 2) - (gap / 4);
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const minY = Math.min(line[0][1], line[1][1]);
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for (let i = 0; i < count; i++) {
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const y = minY + offset + (i * gap);
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const cx = (x - ro) + Math.random() * 2 * ro;
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const cy = (y - ro) + Math.random() * 2 * ro;
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const el = this.helper.ellipse(cx, cy, fweight, fweight, o);
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ops.push(...el.ops);
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}
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}
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return { type: 'fillSketch', ops };
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}
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}
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