252 lines
8.1 KiB
TypeScript
252 lines
8.1 KiB
TypeScript
// 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 base64js from 'base64-js';
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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 {parseServerTiming, PathfinderMeshData} from "./meshes";
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import {lerp, panic, Range, unwrapNull, unwrapUndef} from "./utils";
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export const BUILTIN_SVG_URI: string = "/svg/demo";
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const parseColor = require('parse-color');
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const PARTITION_SVG_PATHS_ENDPOINT_URL: string = "/partition-svg-paths";
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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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type FillRule = 'evenodd' | 'winding';
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export abstract class SVGPath {
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element: SVGPathElement;
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color: glmatrix.vec4;
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constructor(element: SVGPathElement, colorProperty: keyof CSSStyleDeclaration) {
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this.element = element;
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const style = window.getComputedStyle(element);
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this.color = unwrapNull(colorFromStyle(style[colorProperty]));
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}
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}
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export class SVGFill extends SVGPath {
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fillRule: FillRule;
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get pathfinderFillRule(): string {
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return { evenodd: 'EvenOdd', winding: 'Winding' }[this.fillRule];
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}
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constructor(element: SVGPathElement) {
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super(element, 'fill');
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const style = window.getComputedStyle(element);
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this.fillRule = style.fillRule === 'evenodd' ? 'evenodd' : 'winding';
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}
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}
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export class SVGStroke extends SVGPath {
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width: number;
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constructor(element: SVGPathElement) {
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super(element, 'stroke');
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const style = window.getComputedStyle(element);
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const ctm = element.getCTM();
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const strokeWidthString = unwrapNull(style.strokeWidth);
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const matches = /^(\d+\.?\d*)(.*)$/.exec(strokeWidthString);
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let strokeWidth;
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if (matches == null) {
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strokeWidth = 0.0;
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} else {
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strokeWidth = parseFloat(matches[1]);
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if (matches[2] === 'px')
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strokeWidth *= lerp(ctm.a, ctm.d, 0.5);
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}
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this.width = strokeWidth;
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}
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}
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interface ClipPathIDTable {
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[id: string]: number;
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}
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export class SVGLoader {
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pathInstances: SVGPath[];
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scale: number;
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pathBounds: glmatrix.vec4[];
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svgBounds: glmatrix.vec4;
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svgViewBox: glmatrix.vec4;
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isMonochrome: boolean;
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private svg: SVGSVGElement;
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private fileData: ArrayBuffer;
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private paths: any[];
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private clipPathIDs: ClipPathIDTable;
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constructor() {
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this.scale = 1.0;
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this.pathInstances = [];
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this.pathBounds = [];
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this.svgBounds = glmatrix.vec4.create();
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this.svg = unwrapNull(document.getElementById('pf-svg')) as Element as SVGSVGElement;
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this.isMonochrome = false;
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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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partition(pathIndex?: number | undefined): Promise<PathfinderMeshData> {
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// Make the request.
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const paths = pathIndex == null ? this.paths : [this.paths[pathIndex]];
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let time = 0;
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return window.fetch(PARTITION_SVG_PATHS_ENDPOINT_URL, {
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body: JSON.stringify({
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paths: paths,
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viewBoxHeight: this.svgViewBox[3] - this.svgViewBox[1],
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viewBoxWidth: this.svgViewBox[2] - this.svgViewBox[0],
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}),
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headers: {'Content-Type': 'application/json'} as any,
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method: 'POST',
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}).then(response => {
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time = parseServerTiming(response.headers);
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return response.arrayBuffer();
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}).then(buffer => new PathfinderMeshData(buffer));
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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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const viewBox = svgElement.viewBox.baseVal;
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this.svg.setAttribute('width', "" + viewBox.width);
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this.svg.setAttribute('height', "" + viewBox.height);
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// Scan for geometry elements.
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this.pathInstances.length = 0;
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this.clipPathIDs = {};
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this.scanElement(this.svg);
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this.paths = [];
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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, viewBox.height - svgCTM.f);
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glmatrix.mat2d.scale(ctm, ctm, [this.scale, this.scale]);
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const bottomLeft = glmatrix.vec2.create();
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const topRight = glmatrix.vec2.create();
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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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glmatrix.vec2.min(bottomLeft, bottomLeft, point);
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glmatrix.vec2.max(topRight, topRight, point);
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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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const pathBounds = glmatrix.vec4.clone([
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bottomLeft[0], bottomLeft[1],
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topRight[0], topRight[1],
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]);
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if (instance instanceof SVGFill) {
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this.paths.push({
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kind: { Fill: instance.pathfinderFillRule },
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segments: segments,
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});
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this.pathBounds.push(pathBounds);
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} else if (instance instanceof SVGStroke) {
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this.paths.push({ kind: { Stroke: instance.width }, segments: segments });
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this.pathBounds.push(pathBounds);
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}
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}
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this.isMonochrome = this.pathInstances.every(pathInstance => {
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return glmatrix.vec4.equals(pathInstance.color, this.pathInstances[0].color);
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});
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this.svgViewBox = glmatrix.vec4.clone([
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viewBox.x, viewBox.y, viewBox.x + viewBox.width, viewBox.y + viewBox.height,
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]);
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}
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private scanElement(element: Element): void {
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const style = window.getComputedStyle(element);
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if (element instanceof SVGPathElement) {
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if (colorFromStyle(style.fill) != null)
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this.addPathInstance(new SVGFill(element));
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if (colorFromStyle(style.stroke) != null)
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this.addPathInstance(new SVGStroke(element));
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}
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for (const kid of element.childNodes) {
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if (kid instanceof Element)
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this.scanElement(kid);
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}
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}
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private addPathInstance(pathInstance: SVGPath): void {
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this.pathInstances.push(pathInstance);
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}
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}
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function colorFromStyle(style: string | null): glmatrix.vec4 | null {
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if (style == null || style === 'none')
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return null;
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// TODO(pcwalton): Gradients?
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const color = parseColor(style);
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if (color.rgba == null)
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return glmatrix.vec4.clone([0.0, 0.0, 0.0, 1.0]);
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if (color.rgba[3] === 0.0)
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return null;
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return glmatrix.vec4.clone(color.rgba);
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}
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