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05949608aa
(closes #6217) - Split `actionStraighten` into `actionStraightenWay` and `actionStraightenNodes` - Now `operationStraighten` chooses the correct action depending on selected entities - Also move `getSmallestSurroundingRectangle` from `actionReflect` to `geo.js`
70 lines
2.3 KiB
JavaScript
70 lines
2.3 KiB
JavaScript
import { geoGetSmallestSurroundingRectangle, geoVecInterp, geoVecLength } from '../geo';
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import { utilGetAllNodes } from '../util';
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/* Reflect the given area around its axis of symmetry */
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export function actionReflect(reflectIds, projection) {
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var _useLongAxis = true;
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var action = function(graph, t) {
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if (t === null || !isFinite(t)) t = 1;
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t = Math.min(Math.max(+t, 0), 1);
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var nodes = utilGetAllNodes(reflectIds, graph);
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var points = nodes.map(function(n) { return projection(n.loc); });
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var ssr = geoGetSmallestSurroundingRectangle(points);
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// Choose line pq = axis of symmetry.
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// The shape's surrounding rectangle has 2 axes of symmetry.
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// Reflect across the longer axis by default.
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var p1 = [(ssr.poly[0][0] + ssr.poly[1][0]) / 2, (ssr.poly[0][1] + ssr.poly[1][1]) / 2 ];
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var q1 = [(ssr.poly[2][0] + ssr.poly[3][0]) / 2, (ssr.poly[2][1] + ssr.poly[3][1]) / 2 ];
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var p2 = [(ssr.poly[3][0] + ssr.poly[4][0]) / 2, (ssr.poly[3][1] + ssr.poly[4][1]) / 2 ];
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var q2 = [(ssr.poly[1][0] + ssr.poly[2][0]) / 2, (ssr.poly[1][1] + ssr.poly[2][1]) / 2 ];
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var p, q;
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var isLong = (geoVecLength(p1, q1) > geoVecLength(p2, q2));
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if ((_useLongAxis && isLong) || (!_useLongAxis && !isLong)) {
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p = p1;
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q = q1;
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} else {
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p = p2;
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q = q2;
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}
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// reflect c across pq
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// http://math.stackexchange.com/questions/65503/point-reflection-over-a-line
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var dx = q[0] - p[0];
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var dy = q[1] - p[1];
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var a = (dx * dx - dy * dy) / (dx * dx + dy * dy);
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var b = 2 * dx * dy / (dx * dx + dy * dy);
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for (var i = 0; i < nodes.length; i++) {
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var node = nodes[i];
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var c = projection(node.loc);
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var c2 = [
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a * (c[0] - p[0]) + b * (c[1] - p[1]) + p[0],
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b * (c[0] - p[0]) - a * (c[1] - p[1]) + p[1]
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];
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var loc2 = projection.invert(c2);
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node = node.move(geoVecInterp(node.loc, loc2, t));
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graph = graph.replace(node);
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}
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return graph;
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};
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action.useLongAxis = function(val) {
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if (!arguments.length) return _useLongAxis;
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_useLongAxis = val;
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return action;
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};
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action.transitionable = true;
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return action;
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}
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