Detect square paths
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@ -29,6 +29,8 @@ const QUAD_VERTEX_POSITIONS: Uint8Array = new Uint8Array([
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0, 1,
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]);
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const EPSILON: number = 1e-6;
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interface SVGPath {
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abs(): SVGPath;
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translate(x: number, y: number): SVGPath;
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@ -37,9 +39,18 @@ interface SVGPath {
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SVGPath;
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}
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interface Point2D {
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class Point2D {
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x: number;
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y: number;
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constructor(x: number, y: number) {
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this.x = x;
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this.y = y;
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}
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approxEq(other: Point2D): boolean {
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return Math.abs(this.x - other.x) <= EPSILON && Math.abs(this.y - other.y) <= EPSILON;
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}
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}
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interface Size2D {
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@ -228,6 +239,9 @@ class App {
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gl.enableVertexAttribArray(coverProgram.attributes.TileIndex);
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gl.enableVertexAttribArray(coverProgram.attributes.Color);
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// Set up event handlers.
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this.canvas.addEventListener('click', event => this.onClick(event), false);
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this.scene = null;
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this.primitiveCount = 0;
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}
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@ -312,11 +326,12 @@ class App {
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point = firstPoint;
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} else {
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point = {
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x: parseFloat(segment[segment.length - 2]) - tile.origin.x,
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y: parseFloat(segment[segment.length - 1]) - tile.origin.y,
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x: parseFloat(segment[segment.length - 2]),
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y: parseFloat(segment[segment.length - 1]),
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};
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}
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/*
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if (!(point.x > -1.0))
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throw new Error("x too low");
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if (!(point.y > -1.0))
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@ -325,6 +340,7 @@ class App {
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throw new Error("x too high:" + point.x);
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if (!(point.y < TILE_SIZE + 1.0))
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throw new Error("y too high");
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*/
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if (segment[0] === 'M') {
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firstPoint = point;
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@ -362,6 +378,10 @@ class App {
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this.primitiveCount = primitiveCount;
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console.log(primitiveCount + " primitives");
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}
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private onClick(event: MouseEvent): void {
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this.redraw();
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}
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}
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class Scene {
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@ -420,13 +440,16 @@ class Scene {
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let x = boundingRect.origin.x - boundingRect.origin.x % TILE_SIZE;
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while (true) {
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const tileBounds = {
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origin: {x, y},
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origin: new Point2D(x, y),
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size: {width: TILE_SIZE, height: TILE_SIZE},
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};
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const tilePath = this.clipPathToRect(path, tileBounds);
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if (tilePath.toString().length > 0)
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tiles.push(new Tile(pathElementIndex, tilePath, tileBounds.origin));
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if (tilePath.toString().length > 0) {
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tilePath.translate(-tileBounds.origin.x, -tileBounds.origin.y);
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if (!pathIsSquare(tilePath, TILE_SIZE))
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tiles.push(new Tile(pathElementIndex, tilePath, tileBounds.origin));
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}
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if (x >= boundingRect.origin.x + boundingRect.size.width)
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break;
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@ -465,6 +488,7 @@ class Scene {
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document.body.removeChild(svgElement);
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console.log(tiles);
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this.tiles = tiles;
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this.pathColors = pathColors;
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}
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@ -483,8 +507,8 @@ class Scene {
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}
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});
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if (minX == null || minY == null || maxX == null || maxY == null)
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return {origin: {x: 0, y: 0}, size: {width: 0, height: 0}};
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return {origin: {x: minX, y: minY}, size: {width: maxX - minX, height: maxY - minY}};
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return {origin: new Point2D(0, 0), size: {width: 0, height: 0}};
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return {origin: new Point2D(minX, minY), size: {width: maxX - minX, height: maxY - minY}};
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}
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private clipPathToRect(path: SVGPath, tileBounds: Rect): SVGPath {
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@ -496,17 +520,15 @@ class Scene {
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}
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private clipPathToEdge(edge: Edge, edgePos: number, input: SVGPath): SVGPath {
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let pathStart: Point2D | null = null, from = {x: 0, y: 0}, firstPoint = false;
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let pathStart: Point2D | null = null, from = new Point2D(0, 0), firstPoint = false;
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let output: string[][] = [];
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input.iterate(segment => {
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const event = segment[0];
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let to;
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switch (event) {
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case 'M':
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from = {
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x: parseFloat(segment[segment.length - 2]),
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y: parseFloat(segment[segment.length - 1]),
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};
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from = new Point2D(parseFloat(segment[segment.length - 2]),
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parseFloat(segment[segment.length - 1]));
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pathStart = from;
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firstPoint = true;
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return;
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@ -516,10 +538,8 @@ class Scene {
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to = pathStart;
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break;
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default:
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to = {
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x: parseFloat(segment[segment.length - 2]),
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y: parseFloat(segment[segment.length - 1]),
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};
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to = new Point2D(parseFloat(segment[segment.length - 2]),
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parseFloat(segment[segment.length - 1]));
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break;
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}
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@ -586,7 +606,7 @@ class Scene {
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}
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const intersection = cross(cross(start, end), edgeVector);
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return {x: intersection.x / intersection.z, y: intersection.y / intersection.z};
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return new Point2D(intersection.x / intersection.z, intersection.y / intersection.z);
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}
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}
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@ -687,6 +707,30 @@ function waitForQuery(gl: WebGL2RenderingContext, disjointTimerQueryExt: any, qu
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console.log(elapsed + "ms elapsed");
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}
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function pathIsSquare(path: SVGPath, squareLength: number): boolean {
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const SQUARE_VERTICES = [
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new Point2D(0.0, 0.0),
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new Point2D(0.0, squareLength),
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new Point2D(squareLength, squareLength),
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new Point2D(squareLength, 0.0),
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];
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let result = true;
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path.iterate((segment, index) => {
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if (index < SQUARE_VERTICES.length) {
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const point = new Point2D(parseFloat(segment[1]), parseFloat(segment[2]));
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result = result && point.approxEq(SQUARE_VERTICES[index]);
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} else if (index === SQUARE_VERTICES.length) {
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const point = new Point2D(parseFloat(segment[1]), parseFloat(segment[2]));
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result = result && (segment[0] === 'Z' || point.approxEq(SQUARE_VERTICES[0]));
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} else if (index === SQUARE_VERTICES.length + 1) {
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result = result && segment[0] === 'Z';
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} else {
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result = false;
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}
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});
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return result;
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}
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function main(): void {
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window.fetch(SVG).then(svg => {
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svg.text().then(svgText => {
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