Mouse.qml Example File

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  //Import the declarative plugins
  import QtQuick 2.0

  //Import the javascript functions for this game
  import "lib.js" as Lib

  //Implementation of the Mouse control.
  Item {
      id: mouse
      x: 0
      y: 0
      width: Lib.cellDimension
      height: Lib.cellDimension
      property int angle

      AnimatedImage {
          id: img
          source: "content/mouse_down.gif"
          anchors.fill: parent
          visible:  true
      }

      function distance(origX, origY, newX, newY) {
        return Math.sqrt((Math.pow((newX - origX),2)) + (Math.pow((newY - origY),2)))
      }

      //Function for moving the mouse
      function move(newx, newy)
      {
          if (mouse.x === newx && mouse.y === newy)
              return
          // somehow this actually works
          var a = newy - mouse.y
          var b = newx - mouse.x
          var c = distance(mouse.x, mouse.y, newx, newy)
          var radians_to_degrees = 57.2957795

          if (a > 0)
              angle = -Math.acos(a / b) * radians_to_degrees
          else
              angle = -Math.asin(b / c) * radians_to_degrees
          if (b > 0)
               angle = -Math.acos(a / c) * radians_to_degrees
          else
              angle = Math.acos(a / c) * radians_to_degrees

          if (angle < 0)
              angle = 360 + angle

          img.rotation = angle
          mouse.x = newx;
          mouse.y = newy;
      }
  }