| 1 | "use strict";
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| 2 |
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| 3 | Object.defineProperty(exports, "__esModule", {
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| 4 | value: true
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| 5 | });
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| 6 | exports.clipEdges = clipEdges;
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| 7 | exports.createBorderEdge = createBorderEdge;
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| 8 | exports.createEdge = createEdge;
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| 9 | exports.setEdgeEnd = setEdgeEnd;
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| 10 | var _Diagram = require("./Diagram");
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| 11 | function createEdge(left, right, v0, v1) {
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| 12 | var edge = [null, null],
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| 13 | index = _Diagram.edges.push(edge) - 1;
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| 14 | edge.left = left;
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| 15 | edge.right = right;
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| 16 | if (v0) setEdgeEnd(edge, left, right, v0);
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| 17 | if (v1) setEdgeEnd(edge, right, left, v1);
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| 18 | _Diagram.cells[left.index].halfedges.push(index);
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| 19 | _Diagram.cells[right.index].halfedges.push(index);
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| 20 | return edge;
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| 21 | }
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| 22 | function createBorderEdge(left, v0, v1) {
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| 23 | var edge = [v0, v1];
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| 24 | edge.left = left;
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| 25 | return edge;
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| 26 | }
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| 27 | function setEdgeEnd(edge, left, right, vertex) {
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| 28 | if (!edge[0] && !edge[1]) {
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| 29 | edge[0] = vertex;
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| 30 | edge.left = left;
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| 31 | edge.right = right;
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| 32 | } else if (edge.left === right) {
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| 33 | edge[1] = vertex;
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| 34 | } else {
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| 35 | edge[0] = vertex;
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| 36 | }
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| 37 | }
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| 38 |
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| 39 | // Liang–Barsky line clipping.
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| 40 | function clipEdge(edge, x0, y0, x1, y1) {
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| 41 | var a = edge[0],
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| 42 | b = edge[1],
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| 43 | ax = a[0],
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| 44 | ay = a[1],
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| 45 | bx = b[0],
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| 46 | by = b[1],
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| 47 | t0 = 0,
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| 48 | t1 = 1,
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| 49 | dx = bx - ax,
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| 50 | dy = by - ay,
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| 51 | r;
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| 52 | r = x0 - ax;
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| 53 | if (!dx && r > 0) return;
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| 54 | r /= dx;
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| 55 | if (dx < 0) {
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| 56 | if (r < t0) return;
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| 57 | if (r < t1) t1 = r;
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| 58 | } else if (dx > 0) {
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| 59 | if (r > t1) return;
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| 60 | if (r > t0) t0 = r;
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| 61 | }
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| 62 | r = x1 - ax;
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| 63 | if (!dx && r < 0) return;
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| 64 | r /= dx;
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| 65 | if (dx < 0) {
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| 66 | if (r > t1) return;
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| 67 | if (r > t0) t0 = r;
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| 68 | } else if (dx > 0) {
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| 69 | if (r < t0) return;
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| 70 | if (r < t1) t1 = r;
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| 71 | }
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| 72 | r = y0 - ay;
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| 73 | if (!dy && r > 0) return;
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| 74 | r /= dy;
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| 75 | if (dy < 0) {
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| 76 | if (r < t0) return;
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| 77 | if (r < t1) t1 = r;
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| 78 | } else if (dy > 0) {
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| 79 | if (r > t1) return;
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| 80 | if (r > t0) t0 = r;
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| 81 | }
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| 82 | r = y1 - ay;
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| 83 | if (!dy && r < 0) return;
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| 84 | r /= dy;
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| 85 | if (dy < 0) {
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| 86 | if (r > t1) return;
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| 87 | if (r > t0) t0 = r;
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| 88 | } else if (dy > 0) {
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| 89 | if (r < t0) return;
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| 90 | if (r < t1) t1 = r;
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| 91 | }
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| 92 | if (!(t0 > 0) && !(t1 < 1)) return true; // TODO Better check?
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| 93 |
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| 94 | if (t0 > 0) edge[0] = [ax + t0 * dx, ay + t0 * dy];
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| 95 | if (t1 < 1) edge[1] = [ax + t1 * dx, ay + t1 * dy];
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| 96 | return true;
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| 97 | }
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| 98 | function connectEdge(edge, x0, y0, x1, y1) {
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| 99 | var v1 = edge[1];
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| 100 | if (v1) return true;
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| 101 | var v0 = edge[0],
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| 102 | left = edge.left,
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| 103 | right = edge.right,
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| 104 | lx = left[0],
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| 105 | ly = left[1],
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| 106 | rx = right[0],
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| 107 | ry = right[1],
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| 108 | fx = (lx + rx) / 2,
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| 109 | fy = (ly + ry) / 2,
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| 110 | fm,
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| 111 | fb;
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| 112 | if (ry === ly) {
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| 113 | if (fx < x0 || fx >= x1) return;
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| 114 | if (lx > rx) {
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| 115 | if (!v0) v0 = [fx, y0];else if (v0[1] >= y1) return;
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| 116 | v1 = [fx, y1];
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| 117 | } else {
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| 118 | if (!v0) v0 = [fx, y1];else if (v0[1] < y0) return;
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| 119 | v1 = [fx, y0];
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| 120 | }
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| 121 | } else {
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| 122 | fm = (lx - rx) / (ry - ly);
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| 123 | fb = fy - fm * fx;
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| 124 | if (fm < -1 || fm > 1) {
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| 125 | if (lx > rx) {
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| 126 | if (!v0) v0 = [(y0 - fb) / fm, y0];else if (v0[1] >= y1) return;
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| 127 | v1 = [(y1 - fb) / fm, y1];
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| 128 | } else {
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| 129 | if (!v0) v0 = [(y1 - fb) / fm, y1];else if (v0[1] < y0) return;
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| 130 | v1 = [(y0 - fb) / fm, y0];
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| 131 | }
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| 132 | } else {
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| 133 | if (ly < ry) {
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| 134 | if (!v0) v0 = [x0, fm * x0 + fb];else if (v0[0] >= x1) return;
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| 135 | v1 = [x1, fm * x1 + fb];
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| 136 | } else {
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| 137 | if (!v0) v0 = [x1, fm * x1 + fb];else if (v0[0] < x0) return;
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| 138 | v1 = [x0, fm * x0 + fb];
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| 139 | }
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| 140 | }
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| 141 | }
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| 142 | edge[0] = v0;
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| 143 | edge[1] = v1;
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| 144 | return true;
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| 145 | }
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| 146 | function clipEdges(x0, y0, x1, y1) {
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| 147 | var i = _Diagram.edges.length,
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| 148 | edge;
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| 149 | while (i--) {
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| 150 | if (!connectEdge(edge = _Diagram.edges[i], x0, y0, x1, y1) || !clipEdge(edge, x0, y0, x1, y1) || !(Math.abs(edge[0][0] - edge[1][0]) > _Diagram.epsilon || Math.abs(edge[0][1] - edge[1][1]) > _Diagram.epsilon)) {
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| 151 | delete _Diagram.edges[i];
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| 152 | }
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| 153 | }
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| 154 | } |
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