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mario
2025-02-26 14:49:25 +07:00
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dcm4chee/default/tmp/deploy/tmp7473912347174030350oviyam2-exp.war/js/rect.js Normal file
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/**
* Definition of shape Rectangles
*/
ovm.shape.rect = function(xPixelSpacing,yPixelSpacing,measure_Unit) {
var handle = 5;
var rects = [];
var curr_rect = null;
var xPxlSpcing = xPixelSpacing;
var yPxlSpcing = yPixelSpacing;
var measureUnit = measure_Unit;
var isCurrentDrawingRect = false;
this.createNewRect = function(x1,y1,x2,y2) {
if(curr_rect!=undefined) {
curr_rect.setCoords(x1,y1,x2,y2,false);
// if(parseFloat(curr_rect.area)>0.0) { // To avoid rectangle in (-)ve area
curr_rect.meanOfRect();
curr_rect.stdDevOfRect();
rects.push(curr_rect);
curr_rect = undefined;
// }
}
};
this.initNewRect = function() {
curr_rect = new ovm.rect(xPxlSpcing, yPxlSpcing, measureUnit, 0, 0, 0, 0, 0);
};
this.draw = function(graphic,canvasCtx) {
canvasCtx.lineWidth='2';
canvasCtx.strokeStyle=canvasCtx.fillStyle='orange';
var w = graphic.x2-graphic.x1;
var h = graphic.y2-graphic.y1;
canvasCtx.strokeRect(graphic.x1,graphic.y1,w,h);
// Handles
if(graphic.active) {
canvasCtx.strokeStyle = canvasCtx.fillStyle = 'white';
canvasCtx.strokeRect(graphic.x1-handle,graphic.y1-handle,handle*2,handle*2);
canvasCtx.strokeRect(graphic.x1+(w/2)-handle,graphic.y1-handle,handle*2,handle*2);
canvasCtx.strokeRect((graphic.x1+w)-handle,graphic.y1-handle,handle*2,handle*2);
canvasCtx.strokeRect(graphic.x1-handle,graphic.y1+(h/2)-handle,handle*2,handle*2);
canvasCtx.strokeRect((graphic.x1+w)-handle,graphic.y1+(h/2)-handle,handle*2,handle*2);
canvasCtx.strokeRect(graphic.x1-handle,(graphic.y1+h)-handle,handle*2,handle*2);
canvasCtx.strokeRect(graphic.x1+(w/2)-handle,(graphic.y1+h)-handle,handle*2,handle*2);
canvasCtx.strokeRect((graphic.x1+w)-handle,(graphic.y1+h)-handle,handle*2,handle*2);
}
// Text
canvasCtx.fillStyle = graphic.txtActive? "blue" : "maroon";
canvasCtx.globalAlpha = 0.5;
canvasCtx.font = "14px Arial";
var text = canvasCtx.measureText(graphic.stdDev.length>graphic.area.length? graphic.stdDev : graphic.area);
canvasCtx.fillRect(graphic.textX,graphic.textY,Math.ceil(text.width)+10,60);
canvasCtx.globalAlpha = 0.9;
canvasCtx.fillStyle = "white";
//canvasCtx.fillText(graphic.area,graphic.textX+2,graphic.textY+15);
//canvasCtx.fillText(graphic.mean,graphic.textX+2,graphic.textY+35);
//canvasCtx.fillText(graphic.stdDev,graphic.textX+2,graphic.textY+55);
if(state.hflip && !state.vflip && !state.rotate!=0 && !this.isCurrentDrawingRect){
canvasCtx.save();
canvasCtx.translate(drawCanvas.width,0);
canvasCtx.scale(-1,1);
canvasCtx.fillText(graphic.area,(drawCanvas.width -graphic.textX+2)-135,graphic.textY+15);
canvasCtx.fillText(graphic.mean,(drawCanvas.width -graphic.textX+2)-135,graphic.textY+35);
canvasCtx.fillText(graphic.stdDev,(drawCanvas.width -graphic.textX+2)-135,graphic.textY+55);
canvasCtx.restore();
}
if(state.vflip && !state.hflip && !state.rotate!=0 && !this.isCurrentDrawingRect){
canvasCtx.save();
canvasCtx.translate(0,drawCanvas.height);
canvasCtx.scale(1,-1);
canvasCtx.fillText(graphic.area, graphic.textX+2,(drawCanvas.height -graphic.textY)-48);
canvasCtx.fillText(graphic.mean, graphic.textX+2,(drawCanvas.height -graphic.textY)-28);
canvasCtx.fillText(graphic.stdDev, graphic.textX+2,(drawCanvas.height -graphic.textY)-8);
canvasCtx.restore();
}
if(!state.vflip && state.hflip && (state.rotate===90 || state.rotate===180 || state.rotate===270) && !this.isCurrentDrawingRect){
if(state.rotate===90 || state.rotate===180 || state.rotate===270) {
canvasCtx.save();
canvasCtx.translate(0,drawCanvas.height);
canvasCtx.scale(1,-1);
canvasCtx.fillText(graphic.area,graphic.textX+2,(drawCanvas.height -graphic.textY)-50);
canvasCtx.fillText(graphic.mean,graphic.textX+2,(drawCanvas.height -graphic.textY)-30);
canvasCtx.fillText(graphic.stdDev,graphic.textX+2,(drawCanvas.height -graphic.textY)-10);
canvasCtx.restore();
}
}
if(state.vflip && !state.hflip && (state.rotate===90 || state.rotate===180 || state.rotate===270) && !this.isCurrentDrawingRect){
if(state.rotate===90 || state.rotate===180 || state.rotate===270) {
canvasCtx.save();
canvasCtx.translate(drawCanvas.width,0);
canvasCtx.scale(-1,1);
canvasCtx.fillText(graphic.area,(drawCanvas.width -graphic.textX+2)-130,graphic.textY+15);
canvasCtx.fillText(graphic.mean,(drawCanvas.width -graphic.textX+2)-130,graphic.textY+35);
canvasCtx.fillText(graphic.stdDev,(drawCanvas.width -graphic.textX+2)-130,graphic.textY+55);
canvasCtx.restore();
}
}
if(state.rotate!=0 && !state.vflip && !state.hflip && !this.isCurrentDrawingRect) {
if(state.rotate===180) {
canvasCtx.save();
canvasCtx.translate(drawCanvas.width/2,drawCanvas.height/2);
canvasCtx.rotate(Math.PI);
canvasCtx.translate(-drawCanvas.width/2,-drawCanvas.height/2);
canvasCtx.fillText(graphic.area,(drawCanvas.width -graphic.textX)-130, (drawCanvas.height -graphic.textY)-50);
canvasCtx.fillText(graphic.mean, (drawCanvas.width -graphic.textX)-130, (drawCanvas.height -graphic.textY)-30);
canvasCtx.fillText(graphic.stdDev, (drawCanvas.width -graphic.textX)-130, (drawCanvas.height -graphic.textY)-10);
canvasCtx.restore();
}
else {
canvasCtx.fillText(graphic.area,graphic.textX+2,graphic.textY+15);
canvasCtx.fillText(graphic.mean,graphic.textX+2,graphic.textY+35);
canvasCtx.fillText(graphic.stdDev,graphic.textX+2,graphic.textY+55);
}
}
if((state.rotate===0 || state.rotate===90 || state.rotate===180 || state.rotate===270) && state.vflip && state.hflip && !this.isCurrentDrawingRect) {
if(state.rotate===0) {
canvasCtx.save();
canvasCtx.translate(drawCanvas.width,drawCanvas.height);
canvasCtx.scale(-1,-1);
canvasCtx.fillText(graphic.area,(drawCanvas.width -graphic.textX+2)-135,(drawCanvas.height -graphic.textY)-50);
canvasCtx.fillText(graphic.mean,(drawCanvas.width -graphic.textX+2)-135,(drawCanvas.height -graphic.textY)-30);
canvasCtx.fillText(graphic.stdDev,(drawCanvas.width -graphic.textX+2)-135,(drawCanvas.height -graphic.textY)-10);
canvasCtx.restore();
}
else {
canvasCtx.fillText(graphic.area,graphic.textX+2,graphic.textY+15);
canvasCtx.fillText(graphic.mean,graphic.textX+2,graphic.textY+35);
canvasCtx.fillText(graphic.stdDev,graphic.textX+2,graphic.textY+55);
}
}
if((!state.rotate===0 || !state.rotate===90 || !state.rotate===180 || !state.rotate===270) && state.hflip && state.vflip && !this.isCurrentDrawingRect) {
canvasCtx.save();
canvasCtx.translate(drawCanvas.width,drawCanvas.height);
canvasCtx.scale(-1,-1);
canvasCtx.fillText(graphic.area,(drawCanvas.width -graphic.textX+2)-135,(drawCanvas.height -graphic.textY)-50);
canvasCtx.fillText(graphic.mean,(drawCanvas.width -graphic.textX+2)-135,(drawCanvas.height -graphic.textY)-30);
canvasCtx.fillText(graphic.stdDev,(drawCanvas.width -graphic.textX+2)-135,(drawCanvas.height -graphic.textY)-10);
canvasCtx.restore();
}
if(!state.hflip && !state.vflip && !state.rotate!=0 ) {
//canvasCtx.save();
canvasCtx.fillText(graphic.area,graphic.textX+2,graphic.textY+15);
canvasCtx.fillText(graphic.mean,graphic.textX+2,graphic.textY+35);
canvasCtx.fillText(graphic.stdDev,graphic.textX+2,graphic.textY+55);
//canvasCtx.restore();
}
if(this.isCurrentDrawingRect) {
canvasCtx.fillText(graphic.area,graphic.textX+2,graphic.textY+15);
canvasCtx.fillText(graphic.mean,graphic.textX+2,graphic.textY+35);
canvasCtx.fillText(graphic.stdDev,graphic.textX+2,graphic.textY+55);
}
// Reference Lines
if(graphic.x1!=graphic.textX) {
canvasCtx.save();
canvasCtx.beginPath();
canvasCtx.strokeStyle = "yellow";
canvasCtx.setLineDash([10,7]);
var closestPt = this.getClosestAnchor([{x:graphic.textX,y:graphic.textY},{x:graphic.textX+Math.ceil(text.width+10),y:graphic.textY},{x:graphic.textX,y:graphic.textY+60},{x:graphic.textX+Math.ceil(text.width+10),y:graphic.textY+60}],{x:graphic.refX,y:graphic.refY});
canvasCtx.moveTo(closestPt.x, closestPt.y);
canvasCtx.lineTo(graphic.refX,graphic.refY);
canvasCtx.stroke();
canvasCtx.closePath();
canvasCtx.restore();
}
};
this.drawData = function(ctx) {
ctx.save();
for(var i=0;i<rects.length;i++) {
this.draw(this.viewPortGraphic(rects[i]),ctx);
}
ctx.restore();
};
this.drawRect = function(canvasCtx,x1,y1,x2,y2) {
curr_rect.setCoords(x1,y1,x2,y2,true);
this.isCurrentDrawingRect = true;
canvasCtx.save();
canvasCtx.strokeStyle=canvasCtx.fillStyle='orange';
canvasCtx.lineWidth='2';
this.draw(this.viewPortGraphic(curr_rect),canvasCtx);
this.isCurrentDrawingRect = false;
canvasCtx.restore();
};
this.getActiveRect = function(canvasCtx,x,y) {
for(var i=0;i<rects.length;i++) {
var rect = rects[i];
if(rect.isShapeSelection(canvasCtx,x,y)) {
return rect;
}
}
return null;
};
this.viewPortGraphic = function(shape) {
return {
x1:shape.x1*state.scale+state.translationX,
y1:shape.y1*state.scale+state.translationY,
x2:shape.x2*state.scale+state.translationX,
y2:shape.y2*state.scale+state.translationY,
textX:shape.textX*state.scale+state.translationX,
textY:shape.textY*state.scale+state.translationY,
refX:shape.refX*state.scale+state.translationX,
refY:shape.refY*state.scale+state.translationY,
active:shape.active,
txtActive:shape.txtActive,
area:shape.txtArea,
mean:shape.txtMean,
stdDev:shape.txtStdDev
};
};
this.canvasToImgCoordinates = function(point) {
return {x:(point.x-state.translationX)/state.scale,y:(point.y-state.translationY)/state.scale};
};
this.removeShape = function(shape) {
rects.splice(rects.indexOf(shape), 1);
};
this.clearAll = function() {
rects = [];
};
this.getClosestAnchor = function(points,refPt) {
var dist1 = Math.round(Math.sqrt(Math.pow(points[0].x-refPt.x,2) + Math.pow(points[0].y-refPt.y,2)));
var dist2 = Math.round(Math.sqrt(Math.pow(points[1].x-refPt.x,2) + Math.pow(points[1].y-refPt.y,2)));
var dist3 = Math.round(Math.sqrt(Math.pow(points[2].x-refPt.x,2) + Math.pow(points[2].y-refPt.y,2)));
var dist4 = Math.round(Math.sqrt(Math.pow(points[3].x-refPt.x,2) + Math.pow(points[3].y-refPt.y,2)));
var min = Math.min(dist1,dist2,dist3,dist4);
switch(min) {
case dist1:
return points[0];
case dist2:
return points[1];
case dist3:
return points[2];
case dist4:
return points[3];
default:
return points[0];
}
};
};
/**
* @namespace rect
*/
ovm.rect = function(xPixelSpacing,yPixelSpacing,measure_Unit,a,b,c,d,e) {
// Variables
var handle = 5;
this.xPxlSpcing = xPixelSpacing;
this.yPxlSpcing = yPixelSpacing;
this.measureUnit = measure_Unit;
if(this.measureUnit=="cm") {
this.measureUnit = this.measureUnit + String.fromCharCode(178);
}
this.x1=a;
this.y1=b;
this.x2=c;
this.y2=d;
this.width;
this.height;
this.active = false;
this.area = e;
this.mean = "";
this.stdDev = "";
// Text
this.textX = a;
this.textY = b-50;
this.txtActive = false;
this.txtArea = "Area : " + this.area + " " + this.measureUnit;
this.txtMean = "Mean : ";
this.txtStdDev = "StdDev : ";
this.refX = 0;
this.refY = 0;
// Functions
this.setCoords = function(a,b,c,d,active) {
this.x1 = Math.round((a-state.translationX)/state.scale);
this.y1 = Math.round((b-state.translationY)/state.scale);
this.x2 = Math.round((c-state.translationX)/state.scale);
this.y2 = Math.round((d-state.translationY)/state.scale);
this.width = Math.round((this.x2-this.x1)*this.xPxlSpcing);
this.width = (this.width<0) ? Math.abs(this.width) : this.width; //Mouse drag opposite canvas direction (-)ve
this.height = Math.round((this.y2-this.y1)*this.yPxlSpcing);
this.height = (this.height<0) ? Math.abs(this.height) : this.height; //Mouse drag opposite canvas direction (-)ve
this.active = active;
this.area = ((this.width*this.height)/100).toFixed(3);
this.area = (this.area<0) ? Math.abs(this.area) : this.area; //width or height (-)ve, change to (+)ve
this.txtArea = "Area : " + this.area + " " + this.measureUnit;
this.textX = this.x1;
this.textY = this.y1-(100/state.scale);
this.fixReferenceLinePoints();
};
this.getType = function() {
return "rect";
};
this.isShapeSelection = function(canvasCtx,x,y) {
var point = this.canvasToImgcoordinates({x:x,y:y});
var w = this.x2-this.x1,h = this.y2-this.y1;
point = {x:Math.round(point.x),y:Math.round(point.y)};
this.active = this.isLineIntersects(this.x1,this.y1,this.x1+w,this.y1,point.x,point.y) || this.isLineIntersects(this.x1,this.y1+h,this.x1+w,this.y1+h,point.x,point.y) || this.isLineIntersects(this.x1,this.y1,this.x1,this.y1+h,point.x,point.y) || this.isLineIntersects(this.x1+w,this.y1,this.x1+w,this.y1+h,point.x,point.y);
return this.active || this.isTextSelection(canvasCtx,x,y);
};
this.isActiveShape = function(canvasCtx,x,y) {
var point = this.canvasToImgcoordinates({x:x,y:y});
var w = this.x2-this.x1,h = this.y2-this.y1;
this.active = (this.x1<=point.x && this.x1+w>=point.x && this.y1<=point.y && this.y1+h>=point.y) ? true : false;
return this.active || this.isTextSelection(canvasCtx,x,y);
};
this.detectHandle = function(x,y,target) {
var point = this.canvasToImgcoordinates({x:x,y:y});
var w = this.x2-this.x1;
var h = this.y2-this.y1;
if(point.x>=this.x1-handle && point.x<=this.x1+handle && point.y>=this.y1-handle && point.y<=this.y1+handle) {
target.style.cursor = 'nw-resize';
return 0;
} else if(point.x>=((this.x1+(w/2))-handle) && point.x<=((this.x1+(w/2))+handle) && point.y>=this.y1-handle && point.y<=this.y1+handle) {
target.style.cursor = 'n-resize';
return 1;
} else if(point.x>=((this.x1+w)-handle) && point.x<=(this.x1+w+handle) && point.y>=this.y1-handle && point.y<=this.y1+handle) {
target.style.cursor = 'ne-resize';
return 2;
} else if(point.x>=this.x1-handle && point.x<=this.x1+handle && point.y>=((this.y1+(h/2))-handle) && point.y<=((this.y1+(h/2))+handle)) {
target.style.cursor = 'w-resize';
return 3;
} else if(point.x>=((this.x1+w)-handle) && point.x<=(this.x1+w+handle) && point.y>=((this.y1+(h/2))-handle) && point.y<=((this.y1+(h/2))+handle)) {
target.style.cursor = 'e-resize';
return 4;
} else if(point.x>=(this.x1-handle) && point.x<=(this.x1+handle) && point.y>=((this.y1+h)-handle) && point.y<=(this.y1+h+handle)) {
target.style.cursor = 'sw-resize';
return 5;
} else if(point.x>=((this.x1+(w/2))-handle) && point.x<=((this.x1+(w/2))+handle) && point.y>=((this.y1+h)-handle) && point.y<=(this.y1+h+handle)) {
target.style.cursor = 's-resize';
return 6;
} else if(point.x>=((this.x1+w)-handle) && point.x<=(this.x1+w+handle) && point.y>=((this.y1+h)-handle) && point.y<=(this.y1+h+handle)) {
target.style.cursor = 'se-resize';
return 7;
} else {
target.style.cursor = 'default';
return -1;
}
};
this.moveShape = function(deltaX,deltaY) {
if(this.active) {
this.x1+=deltaX;
this.y1+=deltaY;
this.x2+=deltaX;
this.y2+=deltaY;
this.width = Math.round((this.x2-this.x1)*this.xPxlSpcing);
this.height = Math.round((this.y2-this.y1)*this.yPxlSpcing);
this.txtMean = "Mean : ";
this.txtStdDev = "StdDev : ";
}
this.textX+=deltaX;
this.textY+=deltaY;
this.fixReferenceLinePoints();
};
this.resizeShape = function(deltaX,deltaY,handle) {
switch(handle) {
case 0:
this.x1+=deltaX;
this.y1+=deltaY;
break;
case 1:
this.y1+=deltaY;
break;
case 2:
this.x2+=deltaX;
this.y1+=deltaY;
break;
case 3:
this.x1+=deltaX;
break;
case 4:
this.x2+=deltaX;
break;
case 5:
this.x1+=deltaX;
this.y2+=deltaY;
break;
case 6:
this.y2+=deltaY;
break;
case 7:
this.x2+=deltaX;
this.y2+=deltaY;
break;
}
this.textX+=deltaX;
this.textY+=deltaY;
this.width = Math.round((this.x2-this.x1)*this.xPxlSpcing);
this.height = Math.round((this.y2-this.y1)*this.yPxlSpcing);
this.area = ((this.width*this.height)/100).toFixed(3);
this.txtArea = "Area : " + this.area + " " + this.measureUnit;
this.txtMean = "Mean : ";
this.txtStdDev = "StdDev : ";
this.fixReferenceLinePoints();
};
this.meanOfRect = function() {
var sum = 0, pixelCount = 0;
for(var i = this.x1;i<this.x1+this.width;i++) {
for(var j = this.y1;j<this.y1+this.height;j++) {
++pixelCount;
var pixel = getPixelValAt(i,j);
if(pixel!=undefined) {
sum+=pixel;
}
}
}
if(pixelCount==0) {
return 0;
}
this.mean = (sum/pixelCount).toFixed(3);
this.txtMean = "Mean : " + this.mean;
};
this.stdDevOfRect = function() {
var sum = 0,pixelCount = 0;
for(var i = this.x1;i<this.x1+this.width;i++) {
for(var j = this.y1;j<this.y1+this.height;j++) {
++pixelCount;
var value = getPixelValAt(i,j);
if(value!="undefined") {
var deviation = value - this.mean;
sum+=deviation * deviation;
}
}
}
if(pixelCount==0) {
return 0;
}
this.stdDev = Math.sqrt(sum/pixelCount).toFixed(3);
this.txtStdDev = "StdDev : " + this.stdDev;
};
this.measure = function() {
this.meanOfRect();
this.stdDevOfRect();
};
this.canvasToImgcoordinates = function(point) {
return {x:((point.x-state.translationX)/state.scale),y:((point.y-state.translationY)/state.scale)};
};
this.ImgTocanvascoordinates = function(point) {
return {x:point.x*state.scale+state.translationX,y:point.y*state.scale+state.translationY};
};
this.isTextSelection = function(canvasCtx,mouseX,mouseY) {
var point = this.canvasToImgcoordinates({x:mouseX,y:mouseY});
var text = canvasCtx.measureText(this.txtStdDev.length>this.txtArea.length? this.txtStdDev : this.txtArea);
this.txtActive = (point.x>=this.textX && point.x<=this.textX+(Math.ceil((text.width+state.translationX)/state.scale)) && point.y>=this.textY && point.y<=(this.textY+(60/state.scale)));
return this.txtActive;
};
this.isLineIntersects = function(x1,y1,x2,y2,x,y) {
var a = Math.round(Math.sqrt(Math.pow((x2+handle)-(x1+handle),2) + Math.pow((y2+handle)-(y1+handle),2)));
var b = Math.round(Math.sqrt(Math.pow(x-(x1+handle),2) + Math.pow(y-(y1+handle),2)));
var c = Math.round(Math.sqrt(Math.pow((x2+handle)-x,2) + Math.pow((y2+handle)-y,2)));
return (a==b+c);
};
this.fixReferenceLinePoints = function() {
if(this.textX>=this.x1 && this.textX<=this.x2 && this.textY<=this.y1 && this.textY<=this.y2 && this.isPtWithinLine({x:this.x1,y:this.y1}, {x:this.x2,y:this.y1}, {x:this.textX,y:this.textY})) {
this.findClosestPointForLine({x:this.x1,y:this.y1}, {x:this.x2,y:this.y1}, {x:this.textX,y:this.textY});
}
else if(this.textY>=this.y1 && this.textY<=this.y2 && this.textX<=this.x1 && this.textX<=this.x2 && this.isPtWithinLine({x:this.x1,y:this.y1}, {x:this.x1,y:this.y2}, {x:this.textX,y:this.textY})) {
this.findClosestPointForLine({x:this.x1,y:this.y1}, {x:this.x1,y:this.y2}, {x:this.textX,y:this.textY});
}
else if(this.textX>=this.x1 && this.textX<=this.x2 && this.textY>=this.y1 && this.textY>=this.y2 && this.isPtWithinLine({x:this.x1,y:this.y2},{x:this.x2,y:this.y2},{x:this.textX,y:this.textY})) {
this.findClosestPointForLine({x:this.x1,y:this.y2},{x:this.x2,y:this.y2},{x:this.textX,y:this.textY});
}
else if(this.textY>=this.y1 && this.textY<=this.y2 && this.textX>=this.x1 && this.textX>=this.x2 && this.isPtWithinLine({x:this.x2,y:this.y1},{x:this.x2,y:this.y2},{x:this.textX,y:this.textY})) {
this.findClosestPointForLine({x:this.x2,y:this.y1},{x:this.x2,y:this.y2},{x:this.textX,y:this.textY});
} else {
var closestPt = this.getClosestAnchor([{x:this.x1,y:this.y1},{x:this.x2,y:this.y1},{x:this.x1,y:this.y2},{x:this.x2,y:this.y2}],{x:this.textX,y:this.textY});
this.refX = closestPt.x;
this.refY = closestPt.y;
}
};
this.isPtWithinLine = function(A,B,P) {
var dotproduct = (P.x - A.x) * (B.x - A.x) + (P.y - A.y)*(B.y - A.y);
if(dotproduct<0) {
return false;
}
var squaredlengthBA = (B.x - A.x)*(B.X - A.x) + (B.y - A.y)*(B.y - A.y);
if(dotproduct > squaredlengthBA) {
return false;
}
return true;
};
this.findClosestPointForLine = function(A,B,P) {
var a_to_p = [P.x - A.x , P.y - A.y]; // Vector A to P
var a_to_b = [B.x - A.x , B.y - A.y]; // Vector A to B
// Find squared magnitude of a_to_b
var atb2 = Math.pow(a_to_b[0],2) + Math.pow(a_to_b[1],2);
// Find dot product of a_to_p and a_to_b
var atp_dot_atb = a_to_p[0] * a_to_b[0] + a_to_p[1] * a_to_b[1];
// Normalized distance from a to closest point
var t = atp_dot_atb / atb2;
// Add the distance to A, moving towards B
this.refX = A.x + a_to_b[0] * t;
this.refY = A.y + a_to_b[1] * t;
};
this.getClosestAnchor = function(points,refPt) {
var dist1 = Math.round(Math.sqrt(Math.pow(points[0].x-refPt.x,2) + Math.pow(points[0].y-refPt.y,2)));
var dist2 = Math.round(Math.sqrt(Math.pow(points[1].x-refPt.x,2) + Math.pow(points[1].y-refPt.y,2)));
var dist3 = Math.round(Math.sqrt(Math.pow(points[2].x-refPt.x,2) + Math.pow(points[2].y-refPt.y,2)));
var dist4 = Math.round(Math.sqrt(Math.pow(points[3].x-refPt.x,2) + Math.pow(points[3].y-refPt.y,2)));
var min = Math.min(dist1,dist2,dist3,dist4);
switch(min) {
case dist1:
return points[0];
case dist2:
return points[1];
case dist3:
return points[2];
case dist4:
return points[3];
default:
return points[0];
}
};
};