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Triangular.js
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Triangular.js
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// Known bugs:
// Removing lines when there are only one or two triangles removes the polygon group.
var colorSets = {
'Icy': ['E1F2F7', '89BECE', '4F8B98', '0A3F47'],
'Citrus': ['FFDA17', 'EC6227', '6D1F08', '6D1F08'],
'White to Black': ['FBFBFB', 'ADADAD', '39393A', '000000'],
'Red Blue Yellow Purple': ['E30613', '602483', 'B5DEE4', 'FFE600'],
'Eye Candy': ['098e7b', 'fdb606', 'd40144', 'fb4810'],
'Fourties Lipstick': ['0d061c', 'be1900', '1e1c2c', '720a00'],
'Colorful Mess': ['0fe1fa', 'f0ff00', '009bf7', 'ff4001'],
'Plum': ['786262', 'b8988b', 'ebc8ad', '434a4c'],
'Green': ['044c29', '45bf55', '167f39', '96ed89'],
'Purple Cream': ['fee293', '380c2a', 'a6243d', 'e85400'],
'Orange Brown': ['520026', '822a21', 'fc9851', 'c2410a'],
'Green Gold': ['a99000', 'fffb8d', '298737', '005737'],
'Revolution': ['5f020d', '9c0413', 'd9cda9', '0d0000']
};
var colorSetNames = [];
colorSets.each(function(colorSet, i) {
colorSetNames.push(i);
});
var activeColorSet = colorSets[colorSetNames.first];
function onMouseDown(event) {
structure.onMouseDown(event);
}
function onMouseDrag(event) {
structure.onMouseDrag(event);
}
function onMouseUp(event) {
structure.onMouseUp(event);
}
var values = {
maxDistance: 100
}
var components = {
colorset: {
type: 'list', label: 'Color Set',
options: colorSetNames,
onChange: function(value) {
activeColorSet = colorSets[value];
structure.polygons.each(function(polygon) {
polygon.colorize();
});
}
},
maxDistance: {
label: 'Maximum Distance',
steppers: true,
increment: 50,
units: 'point'
},
menuEntry: {
type: 'menu-entry',
value: 'Initialize With Selected',
onSelect: function() {
var selectedGroups = document.getItems({
type: Group,
selected: true
});
var structureGroup;
for(var i = 0; i < selectedGroups.length; i++) {
var selectedGroup = selectedGroups[i];
if(selectedGroup.name == 'Triangular')
structureGroup = selectedGroup;
}
if(structureGroup) {
structure = new Structure(structureGroup);
structureGroup.selected = false;
} else {
Dialog.alert('Please select a Triangular group first');
}
}
}
};
var palette = new Palette('Triangular', components, values);
Structure = Base.extend({
initialize: function(group) {
this.lines = [];
this.lastLines = [];
this.maxDistance = 20;
this.polygons = {};
if(!group) {
this.group = new Group();
this.group.name = 'Triangular';
this._id = Math.floor(Math.random() * 10000);
this.group.data._id = this._id;
this.lineGroup = new Group();
this.lineGroup.name = 'Lines';
this.lineGroup.visible = false;
this.group.appendTop(this.lineGroup);
this.polygonGroup = new Group();
this.polygonGroup.name = 'Polygons';
this.group.appendTop(this.polygonGroup);
this.path = new Path();
this.path.fillColor = null;
this.path.strokeColor = new GrayColor(1);
this.path.strokeWidth = 1;
this.path.name = 'data';
this.path.visible = false;
this.group.appendTop(this.path);
} else {
this.group = group;
this._id = this.group.data._id;
this.lineGroup = group.children['Lines'];
this.polygonGroup = group.children['Polygons'];
this.path = group.children['data'];
this.rebuild();
}
},
onMouseDrag: function(event) {
this.lastLines.each(function(line) {
if(line.path)
line.path.remove();
});
this.lastLines = [];
if(!Key.isDown('shift')) {
this.path.segments.pop();
// this.points.pop();
this.addPoint(event.point);
}
},
onMouseDown: function(event) {
this.checkValidity();
this.lines = [];
this.lineGroup.children.each(function(linePath) {
this.lines.push(new Line(linePath));
}, this);
this.points = [];
this.path.segments.each(function(segment) {
this.points.push(segment.point);
}, this);
this.lineGroup.selected = true;
this.showPoints();
var newPoint = event.point;
this.lineGroup.visible = true;
var hitResult = this.lineGroup.hitTest(event.point);
if(hitResult) {
// if we hit an anchor, remove that point
if(hitResult.type == 'anchor') {
var found = false;
newPoint = hitResult.point;
this.removePoint(newPoint);
} else {
// if we hit a line, remove it first
var item = hitResult.item;
if(item instanceof Path && item.isParent(this.lineGroup)) {
newPoint = hitResult.point;
this.removeLine(new Line(item));
}
}
}
// if shift is down don't add a point
if(!Key.isDown('shift')) {
this.addPoint(newPoint);
}
},
onMouseUp: function(event) {
this.lineGroup.visible = false;
this.hidePoints();
this.lineGroup.selected = false;
this.addLastLines();
this.createPolygons();
},
checkValidity: function() {
var valid = true;
if(!this.group.isValid()) {
var groups = document.getItems({
type: Group
});
var triGroup;
groups.each(function(group) {
if(group.name && group.name == 'Triangular' && group.data._id == this._id) {
triGroup = group;
}
}, this);
this.initialize(triGroup);
// print('recreating everything');
return
}
if(this.lineGroup.isValid()) {
for(var i = 0, l = this.lines.length; i < l; i++) {
var line = this.lines[i];
if(!line.getPath().isValid()) {
i = l;
this.rebuild();
}
}
} else {
print('group is invalid');
}
},
showPoints: function() {
this.pointsPreview = new Layer();
this.pointsPreview.color = 'black';
var size = 2 / document.activeView.zoom;
for(var i = 0, l = this.path.segments.length; i < l; i++) {
this.pointsPreview.appendChild(new Path.Circle(this.path.segments[i].point, size));
}
},
hidePoints: function() {
if(this.pointsPreview && this.pointsPreview.isValid()) {
this.pointsPreview.remove();
}
},
rebuild: function() {
this.rebuildLines();
this.rebuildPolygons();
},
rebuildLines: function() {
this.lines = [];
var children = this.lineGroup.children;
for(var j = 0, l = children.length; j < l; j++) {
var linePath = children[j];
if(linePath.name == 'line') {
if(linePath.segments.length == 2) {
var line = new Line(linePath);
this.lines.push(line);
} else {
linePath.remove();
}
}
}
},
rebuildPolygons: function() {
this.polygons = {};
this.polygonGroup.children.each(function(polyGroup) {
var polygon = new Polygon(polyGroup);
this.polygons[polygon.getHash()] = polygon;
}, this);
},
createPolygons: function() {
var polygonizer = new Polygonizer();
polygonizer.add(this.lines);
var polys = polygonizer.getPolygons();
var path;
if(polys) {
for(var i = 0; i < polys.length; i++ ) {
var poly = polys[i];
var polygon = new Polygon(poly);
if(!polygon.exists()) {
path = polygon.getPath();
this.polygonGroup.appendTop(polygon.group);
path.data.exists = true;
this.polygons[polygon.getHash()] = polygon;
} else {
path = this.polygons[polygon.getHash()].path;
path.data.exists = true;
}
}
this.removeUnusedPolygons();
this.polygons.each(function(polygon) {
if(!polygon.fillColor)
polygon.colorize();
});
}
},
removeUnusedPolygons: function() {
for(var i in this.polygons) {
var polygon = this.polygons[i];
var path = polygon.path;
if(path.data.exists) {
path.data.exists = false;
} else {
polygon.group.remove();
delete this.polygons[i];
}
}
},
removeLine: function(toRemove) {
for(var i = 0, l = this.lines.length; i < l; i++) {
var line = this.lines[i];
if(line.equals(toRemove)) {
this.lines.splice(i, 1);
line.path && line.path.remove();
i = l;
}
}
},
removePoint: function(toRemove) {
for(var i = this.lines.length; i != 0; i--) {
var line = this.lines[i - 1];
if(line.hasPoint(toRemove)) {
line.path && line.path.remove();
this.lines.splice(i - 1, 1);
found = true;
}
}
if(found) {
for(var i = 0, l = this.path.segments.length; i < l; i++) {
var segment = this.path.segments[i];
if(segment.point == toRemove) {
this.path.segments.splice(i, 1);
i = l;
}
}
}
},
addLastLines: function() {
this.lastLines.each(function(line) {
this.lines.push(line);
}, this);
this.lastLines = [];
},
addPoint: function(newPoint) {
this.path.add(newPoint);
var path = this.path;
var line = new Line(newPoint, newPoint);
for(var j = 0; j < path.segments.length; j++) {
var segment = path.segments[j];
var point = segment.point;
var delta = point - newPoint;
if(delta.length > 0 && delta.length < values.maxDistance) {
line.initialize(newPoint, point);
var crosses = false;
for(var k = 0, l = this.lines.length; k < l; k++) {
var oldLine = this.lines[k];
if(oldLine.intersects(line)) {
crosses = true;
k = l;
}
}
if(!crosses) {
this.lastLines.push(new Line(newPoint, point));
}
}
}
this.lastLines.each(function(line) {
var path = line.getPath();
this.lineGroup.appendTop(path);
}, this);
}
});
Polygon = Base.extend({
initialize: function(points) {
this.lines = [];
this.points = [];
if(points instanceof Group) {
this.group = points;
this.path = this.group.children['polyPath'];
this.fillColor = this.path.data.fillColor;
for(var i = 0, l = this.path.segments.length; i < l; i++) {
var segment = this.path.segments[i];
this.points.push(segment.point);
}
} else {
this.points = [];
for(var i = 0, l = points.length; i < l; i++) {
if(i % 2)
this.points.push(points[i]);
}
}
for(var i = 0, l = this.points.length; i < l; i++) {
var point = this.points[i];
var nextPoint = this.points[i + 1 < this.points.length ? i + 1 : 0];
this.lines.push([point, nextPoint]);
}
},
exists: function() {
return !!structure.polygons[this.getHash()];
},
getPath: function() {
this.path = new Path();
this.path.strokeColor = null;
this.path.fillColor = null;
this.path.closed = true;
this.path.name = 'polyPath';
this.path.data.hash = this.getHash();
for(var j = 0, l = this.points.length; j < l; j++) {
var point = this.points[j];
this.path.add(point);
}
this.group = new Group();
this.group.name = 'polygon';
this.group.appendTop(this.path);
var center = this.getInCenter();
if(center) {
var clone = this.path.clone();
clone.scale(0.5, center);
clone.name = 'inside';
this.group.appendTop(clone);
var clone = clone.clone();
clone.name = 'shadow';
var delta = clone.segments[1].point - clone.segments[0].point;
delta.length = Math.random() * delta.length / 2 + (delta.length * 0.1);
clone.segments[1].point = clone.segments[0].point + delta;
}
return this.path;
},
getInCenter: function() {
if(!this.center) {
if(this.points.length == 3) {
var lines = [];
for(var i = 0, l = this.points.length; i < l; i++) {
var point = this.points[i];
var prevPoint = i == 0 ? this.points[l - 1] : this.points[i - 1];
var nextPoint = i == l - 1 ? this.points[0] : this.points[i + 1];
var delta1 = nextPoint - point;
var delta2 = prevPoint - point;
delta2.angle = (delta1.angle + delta2.angle) / 2;
lines.push(new Line(point, point + delta2, true));
}
this.center = lines[0].getIntersectionPoint(lines[1]);
}
}
return this.center;
},
getHash: function() {
if(!this.hash) {
if(this.path) {
this.hash = this.path.data.hash;
} else {
var sum = new Point();
for(var i = 0, l = this.points.length; i < l; i++) {
sum += this.points[i];
}
sum = (sum * 10000).floor();
this.hash = sum.x + '' + sum.y;
}
}
return this.hash;
},
findShared: function(mLine) {
for(var i in structure.polygons) {
var polygon = structure.polygons[i];
if(polygon.getHash() != this.getHash()) {
var found = false;
for(var j = 0; j < polygon.lines.length; j++) {
var line = polygon.lines[j];
if((line[0] == mLine[0] && line[1] == mLine[1]) || (line[1] == mLine[0] && line[0] == mLine[1])) {
return polygon;
}
}
}
}
},
colorize: function() {
var colors = {};
var intersects = false;
var colorSet = activeColorSet;
for(var i = 0; i < 4; i++) {
colors[colorSet[i]] = {
found: false
}
}
var takenColors = [];
for(var i = 0; i < this.lines.length; i++) {
var sPolygon = this.findShared(this.lines[i]);
if(sPolygon && sPolygon.fillColor) {
if(colors[sPolygon.fillColor])
colors[sPolygon.fillColor].found = true;
}
}
var selected = false;
var colorsArray = [];
for(var i in colors) {
colors[i].color = i;
colorsArray.push(colors[i]);
}
colorsArray = colorsArray.shuffle();
for(var i = 0; i < colorsArray.length; i++) {
if(!colorsArray[i].found) {
var color = colorsArray[i].color;
this.path.fillColor = '#' + color;
var index = i + 2 >= colorsArray.length ? (i + 2) % colorsArray.length : i + 2;
this.group.children[0].fillColor = colorsArray[index].color;
if(this.group.children.length >= 2) {
var index = i + 1 == colorsArray.length ? 0 : i + 1;
this.group.children[1].fillColor = colorsArray[index].color;
}
this.fillColor = color;
this.path.data.fillColor = color;
break;
}
}
}
});
Line = Base.extend({
initialize: function(point1, point2, extend) {
if(point1 instanceof Path) {
var path = point1;
this.point1 = path.segments.first.point;
this.point2 = path.segments.last.point;
this.path = path;
} else {
this.point1 = point1;
this.point2 = point2;
}
this.vector = this.point2 - this.point1;
var shortV = this.vector.normalize(0.01);
this.shortVector = this.vector - shortV;
this.shortPoint1 = this.point1 - shortV;
// extend controls wether the line extends beyond the defining points,
// meaning point results outside the line segment are allowed.
this.extend = extend;
},
getPath: function() {
if(!this.path) {
this.path = new Path.Line(this.point1, this.point2) {
strokeColor: null,
fillColor: null,
name: 'line'
};
}
return this.path;
},
intersects: function(line) {
var v1 = this.shortVector;
var v2 = line.shortVector;
var cross = v1.cross(v2);
// Epsilon tolerance
if (Math.abs(cross) <= 10e-6)
return null;
var v = line.shortPoint1 - this.shortPoint1;
var t1 = v.cross(v2) / cross;
var t2 = v.cross(v1) / cross;
// Check the ranges of t parameters if the line is not allowed to
// extend beyond the definition points.
if ((this.extend || 0 <= t1 && t1 <= 1)
&& (line.extend || 0 <= t2 && t2 <= 1))
return true;
return null;
},
getIntersectionPoint: function(line) {
var v1 = this.shortVector;
var v2 = line.shortVector;
var cross = v1.cross(v2);
// Epsilon tolerance
if (Math.abs(cross) <= 10e-6)
return null;
var v = line.shortPoint1 - this.shortPoint1;
var t1 = v.cross(v2) / cross;
var t2 = v.cross(v1) / cross;
// Check the ranges of t parameters if the line is not allowed to
// extend beyond the definition points.
if ((this.extend || 0 <= t1 && t1 <= 1)
&& (line.extend || 0 <= t2 && t2 <= 1))
return this.point1 + v1 * t1;
return null;
},
getSide: function(p) {
var v1 = this.point2 - this.point1;
var v2 = p - this.point1;
var ccw = v2.cross(v1);
if (ccw == 0.0) {
ccw = v2.dot(v1);
if (ccw > 0.0) {
ccw = (v2 - v1).dot(v1);
if (ccw < 0.0)
ccw = 0.0;
}
}
return ccw < 0.0 ? -1 : ccw > 0.0 ? 1 : 0;
},
getVector: function() {
return this.point2 - this.point1;
},
equals: function(line) {
return this.point1 == line.point1 && this.point2 == line.point2;
},
sharesPoint: function(line) {
return line.hasPoint(this.point1) || line.hasPoint(this.point2);
},
hasPoint: function(point) {
return this.point1 == point || this.point2 == point;
},
toString: function() {
return 'Line: point1: ' + this.point1 + ', point2' + this.point2;
}
});
/*
* Adapted to Javascript from the JTS Topology Suite by Jonathan Puckey 2010
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* For more information, contact:
*
* Vivid Solutions
* Suite #1A
* 2328 Government Street
* Victoria BC V8T 5G5
* Canada
*
* (250)385-6040
* www.vividsolutions.com
*/
Polygonizer = Base.extend({
initialize: function() {
this.dangles = [];
this.cutEdges = [];
this.invalidRingLines = [];
this.holeList = null;
this.shellList = null;
this.polyList = null;
},
add: function(lines) {
lines.each(function(line) {
if(!this.graph)
this.graph = new PolygonizeGraph();
this.graph.addEdge(line);
}, this);
},
getPolygons: function() {
this.polygonize();
return this.polyList;
},
polygonize: function() {
if(this.polyList != null) return;
this.polyList = [];
if(!this.graph) return;
this.dangles = this.graph.deleteDangles();
this.cutEdges = this.graph.deleteCutEdges();
this.edgeRingList = this.graph.getEdgeRings();
this.validEdgeRingList = [];
this.invalidRingList = [];
// this.edgeRingList = [];
this.findValidRings();
this.findShellsAndHoles();
//this.assignHolesToShells(this.holeList, this.shellList);
this.polyList = [];
for(var i = 0, l = this.shellList.length; i < l; i++) {
var er = this.shellList[i];
var points = er.getCoordinates();
this.polyList.push(points);
}
},
assignHolesToShells: function(holeList, shellList) {
for(var i = 0, l = holeList.length; i < l; i++) {
var holeER = holeList[i];
this.assignHoleToShell(holeER, shellList);
}
},
assignHoleToShell: function(holeER, shellList) {
var shell = EdgeRing.findEdgeRingContaining(holeER, shellList);
if(shell != null)
shell.addHole(holeER.getRing());
},
findValidRings: function() {
for(var i = 0, l = this.edgeRingList.length; i < l; i++) {
var er = this.edgeRingList[i];
if(er.isValid()) {
this.validEdgeRingList.push(er);
} else {
this.invalidRingList.push(er);
}
}
},
findShellsAndHoles: function() {
this.holeList = [];
this.shellList = [];
for(var i = 0, l = this.edgeRingList.length; i < l; i++) {
var er = this.edgeRingList[i];
if(er.isHole()) {
this.holeList.push(er);
} else {
this.shellList.push(er);
}
}
},
});
/**
* Represents a planar graph of edges that can be used to compute a
* polygonization, and implements the algorithms to compute the
* {@link EdgeRings} formed by the graph.
* <p>
* The marked flag on {@link DirectedEdge}s is used to indicate that a directed edge
* has be logically deleted from the graph.
*
* @version 1.7
*/
PolygonizeGraph = Base.extend({
initialize: function() {
this.edges = [];
this.dirEdges = [];
this.nodes = {};
},
addEdge: function(line) {
if(line.point1 != line.point2) {
var startPt = line.point1;
var endPt = line.point2;
var nStart = this.getNode(startPt);
var nEnd = this.getNode(endPt);
var de0 = new PolygonizeDirectedEdge(nStart, nEnd, line.point2, true);
var de1 = new PolygonizeDirectedEdge(nEnd, nStart, line.point1, false);
var edge = new PolygonizeEdge(line);
edge.setDirectedEdges(de0, de1);
this.add(edge);
}
//var linePts = CoordinateArrays.removeRepeatedPoints(line.getCoordinates());
},
deleteDangles: function() {
// nodes to remove:
var nodeStack = this.findNodesOfDegree(1);
var dangleLines = [];
while(nodeStack.length) {
// for(var i = 0, l = nodesToRemove.length; i < l; i++) {
var node = nodeStack.pop();
this.deleteAllEdges(node);
var nodeOutEdges = node.getOutEdges().getEdges();
for(var j = 0, l = nodeOutEdges.length; j < l; j++) {
var de = nodeOutEdges[j];
de.marked = true;
var sym = de.getSym();
if(sym)
sym.marked = true;
// save the line as a dangle
var e = de.getEdge();
dangleLines.push(e);
var toNode = de.to;
// add the toNode to the list to be processed, if it is now a dangle
if (this.getDegreeNonDeleted(toNode) == 1)
nodeStack.push(toNode);
}
}
return dangleLines;
},
deleteCutEdges: function() {
this.computeNextCWEdges();
// label the current set of edgerings
this.findLabeledEdgeRings(this.dirEdges);
/**
* Cut Edges are edges where both dirEdges have the same label.
* Delete them, and record them
*/
var cutLines = [];
for(var i = 0, l = this.dirEdges.length; i < l; i++) {
var de = this.dirEdges[i];
if(de.marked) continue;
var sym = de.getSym();
if(de.label == sym.label) {
de.marked = true;
sym.marked = true;
// save the line as a cut edge
var e = de.getEdge();
cutLines.push(e.line);
}
}
return cutLines;
},
computeNextCWEdges: function() {
this.nodes.each(function(node) {
var deStar = node.getOutEdges();
var startDE = null;
var prevDE = null;
var edges = deStar.getEdges();
for(var i = 0, l = edges.length; i < l; i++) {
var outDE = edges[i];
if(outDE.marked) continue;
if(startDE == null)
startDE = outDE;
if(prevDE != null) {
var sym = prevDE.getSym();
sym.next = outDE;
}
prevDE = outDE
}
if(prevDE != null) {
var sym = prevDE.getSym();
sym.next = startDE;
}
}, this);
},
/**
* Computes the EdgeRings formed by the edges in this graph.
* @return a list of the {@link EdgeRing}s found by the polygonization process.
*/
getEdgeRings: function() {
// maybe could optimize this, since most of these pointers should be set correctly already
// by deleteCutEdges()
this.computeNextCWEdges();
// clear labels of all edges in graph
this.label(this.dirEdges, -1);
var maximalRings = this.findLabeledEdgeRings(this.dirEdges);
this.convertMaximalToMinimalEdgeRings(maximalRings);
var edgeRingList = [];
for(var i = 0, l = this.dirEdges.length; i < l; i++) {
var de = this.dirEdges[i];
if(de.marked) continue;
if(de.isInRing()) continue
var er = this.findEdgeRing(de);
edgeRingList.push(er);
}
return edgeRingList;
},
label: function(dirEdges, label) {
for(var i = 0, l = dirEdges.length; i < l; i++)
dirEdges[i].label = label;
},
findEdgeRing: function(startDE) {
var de = startDE;
er = new EdgeRing();
do {
er.add(de);
de.setRing(er);
de = de.next;
} while (de != startDE);
return er;
},
findLabeledEdgeRings: function(dirEdges) {
var edgeRingStarts = [];
var currLabel = 1;
for(var i = 0, l = dirEdges.length; i < l; i++) {
var de = dirEdges[i];
if(de.marked) continue;
if(de.label >= 0) continue;
edgeRingStarts.push(de);
var edges = this.findDirEdgesInRing(de);
this.label(edges, currLabel);
currLabel++;
}
return edgeRingStarts;
},
findDirEdgesInRing: function(startDE) {
var de = startDE;
var edges = [];
do {
edges.push(de);
de = de.next;
} while (de != startDE);
return edges;
},
convertMaximalToMinimalEdgeRings: function(ringEdges) {
for(var i = 0, l = ringEdges.length; i < l; i++) {
var de = ringEdges[i];
var label = de.label;
var intNodes = this.findIntersectionNodes(de, label);
if(intNodes == null) continue;
// flip the next pointers on the intersection nodes to create minimal edge rings
for(var j = 0, l = intNodes.length; j < l; j++) {
var node = intNodes[j];
this.computeNextCCWEdges(node, label);
}
}
},
getDegree: function(node, label) {
var edges = node.getOutEdges().getEdges();
var degree = 0;
for(var i = 0, l = edges.length; i < l; i++) {
var de = edges[i];
if(de.label == label) degree++;
}
return degree;
},
findIntersectionNodes: function(startDE, label) {
var intNodes = null;
var de = startDE;
do {
var node = de.from;
if(this.getDegree(node, label) > 1) {
if(intNodes == null)
intNodes = [];
intNodes.push(node);
}
de = de.next;
// if(!de) {
// print('found null DE in ring');
// }
// if(de == startDE || !de.isInRing()) {
// print('found DE already in ring');
// }
} while (de != startDE);
return intNodes;
},
/**
* Computes the next edge pointers going CCW around the given node, for the
* given edgering label.
* This algorithm has the effect of converting maximal edgerings into minimal edgerings
*/
computeNextCCWEdges: function(node, label) {
var deStar = node.getOutEdges();
var firstOutDE = null;
var prevInDE = null
// the edges are stored in CCW order around the star
var edges = deStar.getEdges();
for(var i = edges.length - 1; i >= 0; i--) {
var de = edges[i];
var sym = de.getSym();
var outDE = null;
if(de.label == label) outDE = de;
var inDE = null;
if(sym.label == label) inDE = sym;
if(outDE == null && inDE == null) continue; // this edge is not in edgering
if(inDE != null)
prevInDE = inDE;
if(outDE != null) {
if(prevInDE != null) {
prevInDE.next = outDE;
prevInDE = null
}
if(firstOutDE == null)
firstOutDE = outDE;
}
}
if(prevInDE != null) {
prevInDE.next = firstOutDE;
}
},
getDegreeNonDeleted: function(node) {
var edges = node.getOutEdges().getEdges();
var degree = 0;
edges.each(function(de) {
if(!de.marked) degree++;
});
return degree;