if(that.type == "drag"){
      dragok=false;
      for(var i=0;i<storedLines.length;i++){
          var r=storedLines[i];
          if(r.x1>startX && r.x2<(mouseX + startX) && r.y1>startY &&  r.y2<(mouseY + startY)){
              // if yes, set that rects isDragging=true
              dragok=true;
              r.isDragging=true;
              ctx.strokeStyle = "blue";
          }
      }
   }