144 lines
3.8 KiB
JavaScript
144 lines
3.8 KiB
JavaScript
"use strict";
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const TypoGeom = require("typo-geom");
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const Point = require("../../support/point");
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const CurveUtil = require("../../support/curve-util");
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const util = require("util");
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module.exports = finalizeGlyphs;
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function finalizeGlyphs(para, glyphStore) {
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const skew = Math.tan(((para.slopeAngle || 0) / 180) * Math.PI);
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regulateGlyphStore(skew, glyphStore);
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return glyphStore;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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function regulateGlyphStore(skew, glyphStore) {
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for (const g of glyphStore.glyphs()) {
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if (g.geometry.isEmpty()) continue;
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if (!regulateCompositeGlyph(glyphStore, g)) {
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const cs = g.geometry.asContours();
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g.clearGeometry();
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g.includeContours(cs, 0, 0);
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}
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}
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for (const g of glyphStore.glyphs()) {
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if (!g.geometry.asReferences()) regulateSimpleGlyph(g, skew);
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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function regulateCompositeGlyph(glyphStore, g) {
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const refs = g.geometry.asReferences();
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if (!refs) return false;
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for (const sr of refs) {
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const gn = glyphStore.queryNameOf(sr.glyph);
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if (!gn || sr.glyph.autoRefPriority < 0) return false;
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}
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return true;
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}
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function regulateSimpleGlyph(g, skew) {
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let cs = g.geometry.asContours();
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for (const contour of cs) for (const z of contour) z.x -= z.y * skew;
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cs = simplifyContours(cs);
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for (const contour of cs) for (const z of contour) z.x += z.y * skew;
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g.clearGeometry();
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g.includeContours(cs, 0, 0);
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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function simplifyContours(source) {
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const sink = new FairizedShapeSink();
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TypoGeom.ShapeConv.transferGenericShape(
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TypoGeom.Fairize.fairizeBezierShape(
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TypoGeom.Boolean.removeOverlap(
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CurveUtil.convertShapeToArcs(source),
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TypoGeom.Boolean.PolyFillType.pftNonZero,
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CurveUtil.BOOLE_RESOLUTION
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)
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),
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sink,
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CurveUtil.GEOMETRY_PRECISION
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);
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return sink.contours;
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}
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class FairizedShapeSink {
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constructor() {
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this.contours = [];
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this.lastContour = [];
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}
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beginShape() {}
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endShape() {
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if (this.lastContour.length > 2) {
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// TT use CW for outline, being different from Clipper
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const c = this.lastContour.reverse();
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const zFirst = c[0],
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zLast = c[c.length - 1];
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if (isOccurrent(zFirst, zLast)) c.pop();
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this.contours.push(c);
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}
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this.lastContour = [];
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}
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moveTo(x, y) {
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this.endShape();
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this.lineTo(x, y);
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}
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lineTo(x, y) {
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const z = Point.fromXY(Point.Type.Corner, x, y).round(CurveUtil.RECIP_GEOMETRY_PRECISION);
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while (this.lastContour.length >= 2) {
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const a = this.lastContour[this.lastContour.length - 2],
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b = this.lastContour[this.lastContour.length - 1];
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if (isLineExtend(a, b, z)) {
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this.lastContour.pop();
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} else {
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break;
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}
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}
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this.lastContour.push(z);
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}
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arcTo(arc, x, y) {
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const offPoints = TypoGeom.Quadify.auto(arc, 1, 8);
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if (offPoints) {
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for (const z of offPoints)
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this.lastContour.push(
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Point.from(Point.Type.Quadratic, z).round(CurveUtil.RECIP_GEOMETRY_PRECISION)
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);
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}
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this.lineTo(x, y);
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}
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}
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function isOccurrent(zFirst, zLast) {
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return (
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zFirst.type === Point.Type.Corner &&
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zLast.type === Point.Type.Corner &&
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zFirst.x === zLast.x &&
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zFirst.y === zLast.y
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);
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}
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function isLineExtend(a, b, c) {
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return (
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a.type === Point.Type.Corner &&
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c.type === Point.Type.Corner &&
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((aligned(a.x, b.x, c.x) && between(a.y, b.y, c.y)) ||
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(aligned(a.y, b.y, c.y) && between(a.x, b.x, c.x)))
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);
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}
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function geometryPrecisionEqual(a, b) {
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return (
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Math.round(a * CurveUtil.RECIP_GEOMETRY_PRECISION) ===
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Math.round(b * CurveUtil.RECIP_GEOMETRY_PRECISION)
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);
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}
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function aligned(a, b, c) {
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return geometryPrecisionEqual(a, b) && geometryPrecisionEqual(b, c);
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}
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function between(a, b, c) {
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return (a <= b && b <= c) || (a >= b && b >= c);
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}
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