update example
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Casper Lamboo
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226
comb.js
226
comb.js
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@ -1,6 +1,7 @@
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import earcut from 'earcut';
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import { add, divide, distanceTo, normalize, subtract, normal, dot } from './src/sliceActions/helpers/vector2.js';
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function lineIntersection(a1, a2, b1, b2) {
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// source: http://mathworld.wolfram.com/Line-LineIntersection.html
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const intersection = {
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@ -93,100 +94,102 @@ function decompose(polygon) {
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return { vertices, convexPolygons };
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}
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function findClosestPath(convexPolygons, start, end, visited = [], path = []) {
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if (start === end) return [];
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visited = [...visited, start];
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const { connects } = convexPolygons[start];
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const finish = connects.find(({ to }) => to === end);
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if (finish) return [...path, finish];
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const posibilities = [];
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for (const connect of connects) {
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if (visited.includes(connect.to)) continue;
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const posibility = findClosestPath(convexPolygons, connect.to, end, visited, [...path, connect]);
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if (posibility) posibilities.push(posibility);
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}
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if (posibilities.length === 0) {
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return null;
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} else if (posibilities.length === 1) {
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return posibilities[0];
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} else if (posibilities.length > 1) {
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const distanceMap = new WeakMap();
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for (const posibility of posibilities) {
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const distance = posibility.reduce((totalDistance, connect) => totalDistance + connect.distance, 0);
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distanceMap.set(posibility, distance);
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}
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return posibilities.sort((a, b) => distanceMap.get(a) - distanceMap.get(b))[0];
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}
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}
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// const parse = string => parseFloat(string);
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// function findClosestPath(map, start, end) {
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// // dijkstra's algorithm
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// const costs = { [start]: 0 };
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// const open = { [0]: [start] };
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// const predecessors = {};
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// const distanceMap = new WeakMap();
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// function findClosestPath(convexPolygons, start, end, visited = [], path = [], distance = 0) {
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// if (start === end) return [];
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//
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// while (open) {
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// const keys = Object.keys(open).map(parse);
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// if (keys.length === 0) break;
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// keys.sort();
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// visited = [...visited, start];
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//
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// const [key] = keys;
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// const bucket = open[key];
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// const node = bucket.shift();
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// const currentCost = key;
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// const { connects } = map[node];
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// const { connects } = convexPolygons[start];
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//
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// if (!bucket.length) delete open[key];
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// const finish = connects.find(({ to }) => to === end);
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// if (finish) return [...path, finish];
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//
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// for (const { distance, to } of connects) {
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// const totalCost = distance + currentCost;
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// const vertexCost = costs[to];
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// const posibilities = [];
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// for (let i = 0; i < connects.length; i ++) {
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// const connect = connects[i];
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// if (visited.includes(connect.to)) continue;
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//
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// if ((typeof vertexCost === 'undefined') || (vertexCost > totalCost)) {
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// costs[to] = totalCost;
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//
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// if (!open[totalCost]) open[totalCost] = [];
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// open[totalCost].push(to);
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//
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// predecessors[to] = node;
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// }
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// const positibiltyDistance = distance + connect.distance;
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// const posibility = findClosestPath(convexPolygons, connect.to, end, visited, [...path, connect], positibiltyDistance);
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// if (posibility) {
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// posibilities.push(posibility);
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// distanceMap.set(posibility, positibiltyDistance);
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// }
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// }
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//
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// if (typeof costs[end] === 'undefined') return null;
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//
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// const nodes = [];
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// let node = end;
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// while (typeof node !== 'undefined') {
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// nodes.push(node);
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// node = predecessors[node];
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// if (posibilities.length === 0) {
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// return null;
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// } else if (posibilities.length === 1) {
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// return posibilities[0];
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// } else if (posibilities.length > 1) {
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// return posibilities.sort((a, b) => distanceMap.get(a) - distanceMap.get(b))[0];
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// }
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// nodes.reverse();
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//
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// const path = [];
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// for (let i = 1; i < nodes.length; i ++) {
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// const from = nodes[i - 1];
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// const to = nodes[i];
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//
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// const connection = map[from].connects.find(connect => connect.to === to);
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// path.push(connection);
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// }
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//
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// return path;
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// }
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const findKey = _key => ({ key }) => _key === key;
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function findClosestPath(map, start, end) {
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// dijkstra's algorithm
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const distances = { [start]: 0 };
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const open = [{ key: 0, nodes: [start] }];
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const predecessors = {};
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while (open.length !== 0) {
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const key = Math.min(...open.map(n => n.key).sort());
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const bucket = open.find(findKey(key));
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const node = bucket.nodes.shift();
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const currentDistance = key;
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const { connects } = map[node];
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if (bucket.nodes.length === 0) open.splice(open.indexOf(bucket), 1);
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for (let i = 0; i < connects.length; i ++) {
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const { distance, to } = connects[i];
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const totalDistance = distance + currentDistance;
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const vertexDistance = distances[to];
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if ((typeof vertexDistance === 'undefined') || (vertexDistance > totalDistance)) {
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distances[to] = totalDistance;
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let openNode = open.find(findKey(totalDistance));
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if (!openNode) {
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openNode = { key: totalDistance, nodes: [] };
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open.push(openNode);
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}
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openNode.nodes.push(to);
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predecessors[to] = node;
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}
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}
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}
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if (typeof distances[end] === 'undefined') return null;
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const nodes = [];
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let node = end;
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while (typeof node !== 'undefined') {
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nodes.push(node);
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node = predecessors[node];
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}
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nodes.reverse();
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const path = [];
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for (let i = 1; i < nodes.length; i ++) {
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const from = nodes[i - 1];
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const to = nodes[i];
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const connection = map[from].connects.find(connect => connect.to === to);
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path.push(connection);
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}
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return path;
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}
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function containLineInPath(path, start, end, vertices) {
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const line = [start];
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for (const { edge: [indexA, indexB] } of path) {
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for (let i = 0; i < path.length; i ++) {
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const { edge: [indexA, indexB] } = path[i];
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const vertexA = vertices[indexA];
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const vertexB = vertices[indexB];
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@ -204,6 +207,7 @@ function containLineInPath(path, start, end, vertices) {
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return line;
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}
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const canvas = document.createElement('canvas');
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document.body.appendChild(canvas);
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canvas.width = 610;
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@ -281,38 +285,38 @@ function compute() {
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context.fillStyle = 'lightgray';
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context.fill();
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// context.fillStyle = 'black';
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// context.strokeStyle = 'black';
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// context.textAlign = 'center';
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// context.textBaseline = 'middle';
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// context.lineWidth = 1;
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// context.font = '14px arial';
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// for (let i = 0; i < convexPolygons.length; i ++) {
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// const { face, center } = convexPolygons[i];
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//
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// context.beginPath();
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// for (const index of face) {
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// const vertex = vertices[index];
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// context.lineTo(vertex.x, vertex.y);
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// }
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// context.closePath();
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// context.stroke();
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//
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// context.fillText(i, center.x, center.y);
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// }
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context.fillStyle = 'black';
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context.strokeStyle = 'black';
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context.textAlign = 'center';
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context.textBaseline = 'middle';
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context.lineWidth = 1;
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context.font = '14px arial';
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for (let i = 0; i < convexPolygons.length; i ++) {
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const { face, center } = convexPolygons[i];
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// if (path) {
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// context.beginPath();
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// for (const { edge: [indexA, indexB] } of path) {
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// const pointA = vertices[indexA];
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// const pointB = vertices[indexB];
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// context.moveTo(pointA.x, pointA.y);
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// context.lineTo(pointB.x, pointB.y);
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// }
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// context.strokeStyle = 'blue';
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// context.lineWidth = 3;
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// context.stroke();
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// }
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context.beginPath();
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for (const index of face) {
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const vertex = vertices[index];
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context.lineTo(vertex.x, vertex.y);
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}
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context.closePath();
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context.stroke();
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context.fillText(i, center.x, center.y);
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}
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if (path) {
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context.beginPath();
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for (const { edge: [indexA, indexB] } of path) {
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const pointA = vertices[indexA];
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const pointB = vertices[indexB];
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context.moveTo(pointA.x, pointA.y);
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context.lineTo(pointB.x, pointB.y);
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}
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context.strokeStyle = 'blue';
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context.lineWidth = 3;
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context.stroke();
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}
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if (line) {
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context.beginPath();
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