2017-09-19 21:04:42 -04:00
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// pathfinder/client/src/svg-loader.ts
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//
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// Copyright © 2017 The Pathfinder Project Developers.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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import * as glmatrix from 'gl-matrix';
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import * as _ from 'lodash';
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import 'path-data-polyfill.js';
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import {panic, unwrapNull} from "./utils";
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import {PathfinderMeshData, Partitionable} from "./meshes";
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export const BUILTIN_SVG_URI: string = "/svg/demo";
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const PARTITION_SVG_PATHS_ENDPOINT_URL: string = "/partition-svg-paths";
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/// The minimum size of a stroke.
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const HAIRLINE_STROKE_WIDTH: number = 0.25;
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declare class SVGPathSegment {
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type: string;
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values: number[];
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}
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declare global {
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interface SVGPathElement {
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getPathData(settings: any): SVGPathSegment[];
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}
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}
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export interface PathInstance {
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element: SVGPathElement;
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stroke: number | 'fill';
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}
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export class SVGLoader implements Partitionable {
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constructor() {
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this.svg = unwrapNull(document.getElementById('pf-svg')) as Element as SVGSVGElement;
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this.pathInstances = [];
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this.paths = [];
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this.bounds = glmatrix.vec4.create();
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}
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loadFile(fileData: ArrayBuffer) {
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this.fileData = fileData;
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const decoder = new (window as any).TextDecoder('utf-8');
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const fileStringData = decoder.decode(new DataView(this.fileData));
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const svgDocument = (new DOMParser).parseFromString(fileStringData, 'image/svg+xml');
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const svgElement = svgDocument.documentElement as Element as SVGSVGElement;
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this.attachSVG(svgElement);
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}
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private attachSVG(svgElement: SVGSVGElement) {
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// Clear out the current document.
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let kid;
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while ((kid = this.svg.firstChild) != null)
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this.svg.removeChild(kid);
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// Add all kids of the incoming SVG document.
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while ((kid = svgElement.firstChild) != null)
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this.svg.appendChild(kid);
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// Scan for geometry elements.
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this.pathInstances.length = 0;
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const queue: Array<Element> = [this.svg];
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let element;
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while ((element = queue.pop()) != null) {
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let kid = element.lastChild;
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while (kid != null) {
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if (kid instanceof Element)
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queue.push(kid);
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kid = kid.previousSibling;
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}
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if (element instanceof SVGPathElement) {
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const style = window.getComputedStyle(element);
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if (style.fill !== 'none')
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this.pathInstances.push({ element: element, stroke: 'fill' });
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if (style.stroke !== 'none') {
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this.pathInstances.push({
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element: element,
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stroke: parseInt(style.strokeWidth!),
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});
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}
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}
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}
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let minX = 0, minY = 0, maxX = 0, maxY = 0;
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this.paths = [];
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// Extract, normalize, and transform the path data.
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for (const instance of this.pathInstances) {
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const element = instance.element;
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const svgCTM = element.getCTM();
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const ctm = glmatrix.mat2d.fromValues(svgCTM.a, svgCTM.b,
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svgCTM.c, svgCTM.d,
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svgCTM.e, svgCTM.f);
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glmatrix.mat2d.scale(ctm, ctm, [1.0, -1.0]);
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const segments = element.getPathData({normalize: true}).map(segment => {
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const newValues = _.flatMap(_.chunk(segment.values, 2), coords => {
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const point = glmatrix.vec2.create();
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glmatrix.vec2.transformMat2d(point, coords, ctm);
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minX = Math.min(point[0], minX);
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minY = Math.min(point[1], minY);
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maxX = Math.max(point[0], maxX);
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maxY = Math.max(point[1], maxY);
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return [point[0], point[1]];
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});
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return {
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type: segment.type,
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values: newValues,
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};
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});
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let kind;
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if (instance.stroke === 'fill')
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kind = 'Fill';
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else
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kind = { Stroke: Math.max(HAIRLINE_STROKE_WIDTH, instance.stroke) };
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this.paths.push({ segments: segments, kind: kind });
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}
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this.bounds = glmatrix.vec4.clone([minX, minY, maxX, maxY]);
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}
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partition(): Promise<PathfinderMeshData> {
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// Make the request.
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return window.fetch(PARTITION_SVG_PATHS_ENDPOINT_URL, {
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method: 'POST',
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headers: {'Content-Type': 'application/json'},
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body: JSON.stringify({ paths: this.paths }),
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}).then(response => response.text()).then(responseText => {
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const response = JSON.parse(responseText);
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if (!('Ok' in response))
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panic("Failed to partition the font!");
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const meshes = response.Ok.pathData;
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return new PathfinderMeshData(meshes);
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});
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}
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private svg: SVGSVGElement;
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private fileData: ArrayBuffer;
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pathInstances: PathInstance[];
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private paths: any[];
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bounds: glmatrix.vec4;
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}
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