e44d8471e7
Fix broken cup (`∪`) and cap (`∩`) symbol Fix Fix broken degree-C and degree-F ligature. Closes #449, #450.
66 lines
1.3 KiB
JavaScript
66 lines
1.3 KiB
JavaScript
"use strict";
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const quadify = require("primitive-quadify-off-curves");
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exports.OffsetCurve = class OffsetCurve {
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constructor(bone, offset, contrast) {
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this.bone = bone;
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this.offset = offset;
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this.contrast = contrast;
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}
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eval(t) {
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const c = this.bone.eval(t);
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const d = this.bone.derivative(t);
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const absD = Math.hypot(d.x, d.y);
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return {
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x: c.x - (d.y / absD) * this.offset * this.contrast,
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y: c.y + (d.x / absD) * this.offset
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};
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}
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derivative(t) {
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const DELTA = 1 / 0x10000;
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const forward = this.eval(t + DELTA);
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const backward = this.eval(t - DELTA);
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return {
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x: (forward.x - backward.x) / (2 * DELTA),
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y: (forward.y - backward.y) / (2 * DELTA)
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};
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}
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};
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exports.curveToContour = function(curve, err) {
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let exitPoints = [];
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const z0 = curve.eval(0);
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const z1 = curve.eval(1);
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exitPoints.push({
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x: z0.x,
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y: z0.y,
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cubic: false,
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on: true
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});
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const offPoints = quadify.autoQuadify(curve, err || 1);
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for (let k = 0; k < offPoints.length; k++) {
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const z = offPoints[k];
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if (k > 0) {
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const z0 = offPoints[k - 1];
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exitPoints.push({
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x: (z.x + z0.x) / 2,
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y: (z.y + z0.y) / 2,
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on: true
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});
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}
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exitPoints.push({
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x: z.x,
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y: z.y,
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cubic: false,
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on: false
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});
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}
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exitPoints.push({
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x: z1.x,
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y: z1.y,
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cubic: false,
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on: true
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});
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return exitPoints;
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};
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