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Triangulation.js
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Triangulation.js
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//Base image for tridrawing
function Base() {
this.image = null;
this.bounds = null;
}
Base.prototype.setImage = function(image) {
this.image = image;
this.calculateBounds();
};
Base.prototype.calculateBounds = function() {
this.bounds = this.image.bounds;
}
//Base Triangle
function Triangle(a,b,c,ai,bi,ci) {
this.a = a;
this.b = b;
this.c = c;
this.pointsIndex = {'a': ai, 'b': bi, 'c': ci};
this.calculateCircum();
}
Triangle.prototype.calculateCircum = function() {
var a =this.a;
var b= this.b;
var c = this.c;
var y23 = b.y - c.y;
var y31 = c.y - a.y;
var y12 = a.y - b.y;
var aa = a.x*y23 + b.x*y31 + c.x*y12;
var k = a.x*a.x + a.y*a.y;
var m = b.x*b.x + b.y*b.y;
var n = c.x*c.x + c.y*c.y;
var bb = k*y23 + m*y31 + n*y12;
var cc = k*(b.x - c.x) + m*(c.x - a.x) + n*(a.x - b.x);
var dd = k*(b.x*c.y - c.x*b.y)+ m*(c.x*a.y - a.x*c.y) + n*(a.x*b.y - b.x*a.y);
this.circum = {'a': aa, 'b': bb, 'c': cc, 'd': dd};
}
Triangle.prototype.isPointInCircum = function(point) {
var circum = this.circum;
var r = circum.a*(point.x*point.x+point.y*point.y) - circum.b*point.x + circum.c*point.y -circum.d;
return (r<=0);
}
//Triangulation object
function Triangulation() {
this.bounds = null;
this.points = [];
this.triangles = [];
this.onChange = function() {}
}
Triangulation.prototype.setBounds = function(bounds) {
this.bounds = bounds;
var tl = bounds.topLeft;
var tr = bounds.topRight;
var bl = bounds.bottomLeft;
var br = bounds.bottomRight;
this.points[0] = tl;
this.points[1] = tr;
this.points[2] = bl;
this.points[3] = br;
//this.triangles.push(new Triangle(tl,tr,bl)); //Add triangle topLeft, topRight, bottomLeft
//this.triangles.push(new Triangle(bl,tr,br)); //Add triangle bottomLeft, topRight, bottomRight
this.addTriangle(0,1,2); //Add triangle topLeft, topRight, bottomLeft
this.addTriangle(2,1,3); //Add triangle bottomLeft, topRight, bottomRight
this.onChange(this.triangles);
}
Triangulation.prototype.inBounds = function(point) {
return (point.x>=this.bounds.topLeft.x&&point.x<=this.bounds.bottomRight.x
&&point.y>=this.bounds.topLeft.y&&point.y<=this.bounds.bottomRight.y);
}
Triangulation.prototype.addPoint = function(point) {
if(!this.inBounds(point)) return;
/*var circle = new Path.Circle(point,5);
circle.strokeColor = "#FF0000";
circle.fillColor = null;*/
//this.onChange(this.triangles);
var currentIndex = this.points.length;
this.points.push(point);
var boundPoints = [];
//Check for the "inCircum"
for(var i=0;i<this.triangles.length;) {
var t = this.triangles[i];
//recolorTriangle(i,'#FF0000');
if(t.isPointInCircum(point)) {
//recolorTriangle(i,'#FF0000');
if(boundPoints.indexOf(t.pointsIndex.a)==-1) boundPoints.push(t.pointsIndex.a);
if(boundPoints.indexOf(t.pointsIndex.b)==-1) boundPoints.push(t.pointsIndex.b);
if(boundPoints.indexOf(t.pointsIndex.c)==-1) boundPoints.push(t.pointsIndex.c);
//Remove triangle
this.removeTriangle(i);
}
else {
i++; //go to next traingle
}
}
//Sort boundPoints (indexes) by the angles
var p0=this.points[currentIndex];
for(i=0;i<boundPoints.length;i++) {
var p1 = this.points[boundPoints[i]];
var v1 = p1 - p0;
var minAngle = v1.angle;
for(var j=i+1;j<boundPoints.length;j++) {
var p2 = this.points[boundPoints[j]];
var v2 = p2 - p0;
if(v2.angle<minAngle) {
minAngle = v2.angle;
var tempIndex = boundPoints[j];
boundPoints[j] = boundPoints[i];
boundPoints[i] = tempIndex;
}
}
}
//Finally, add all new triangles
for(i=0;i<boundPoints.length;i++) {
p1 = this.points[boundPoints[i]];
var i2 = (i==boundPoints.length-1)?0:(i+1);
p2 = this.points[boundPoints[i2]];
this.addTriangle(currentIndex,boundPoints[i],boundPoints[i2]);
}
this.onChange(this.triangles);
}
Triangulation.prototype.addTriangle = function(ai,bi,ci) {
var a = this.points[ai];
var b = this.points[bi];
var c = this.points[ci];
this.triangles.push(new Triangle(a,b,c,ai,bi,ci));
}
Triangulation.prototype.removeTriangle = function(index) {
this.triangles.splice(index,1);
}
var init = false;
var base;
var triangulation;
function initialize() {
var rasters = document.getItems({
type: Raster,
selected: true
});
if(rasters.length==1) {
initDrawing(rasters[0]);
}
else {
Dialog.alert("Please select one raster image first!");
}
}
function initDrawing(image) {
init=true;
base = new Base();
base.setImage(image);
triangulation = new Triangulation();
triangulation.onChange = onTriangulationChange;
triangulation.setBounds(base.bounds);
}
//Development functions! Check them later!
var graphicTriangles = [];
function onTriangulationChange(triangles) { ///Redraw on triangulation change
removeAllTriangles();
var l = triangles.length;
for(var i=0;i<l;i++) {
var t = triangles[i];
graphicTriangles[i] = drawTriangle(triangles[i]);
}
}
function drawTriangle(triangle) {
var trianglePath = new Path();
trianglePath.add(triangle.a);
trianglePath.add(triangle.b);
trianglePath.add(triangle.c);
trianglePath.closed = true;
trianglePath.fillColor = getRasterColor(base.image,trianglePath);
//trianglePath.opacity = 0.5;
trianglePath.strokeColor = null;
trianglePath.strokeWidth = 0;
return trianglePath;
}
function getRasterColor(raster,path) {
var color = raster.getAverageColor(path);
return color;
}
function recolorTriangle(i,color) {
graphicTriangles[i].strokeColor = color;
}
function removeAllTriangles() {
for(var i=0;i<graphicTriangles.length;i++) {
graphicTriangles[i].remove();
}
}
//
//MouseEvent Handlers
function onMouseDown(event) {
if(!init) return;
if(event.item) {
//console.log(event.item)
}
triangulation.addPoint(event.point);
}
//Init main
initialize();