sk-mbb.js

//record the current drawing coordinates 	  
function recordCoor(event)
{
  //get current mouse coordinate 
  var pointer = canvas.getPointer(event.e);
  var posX = pointer.x;
  var posY = pointer.y;
  
  //record the point if withing the canvas and the mouse is pressed 
  if(posX >=0 && posY >= 0 && mousePressed)  
  {	  
    coords.push(pointer) 
  } 
}
	  
//get the best bounding box by finding the top left and bottom right cornders    
function getMinBox(){
	
   var coorX = coords.map(function(p) {return p.x});
   var coorY = coords.map(function(p) {return p.y});
   //find top left corner 
   var min_coords = {
    x : Math.min.apply(null, coorX),
    y : Math.min.apply(null, coorY)
   }
   //find right bottom corner 
   var max_coords = {
    x : Math.max.apply(null, coorX),
    y : Math.max.apply(null, coorY)
   }
   return {
    min : min_coords,
    max : max_coords
   }
}