Qt 5.7 | Qt Sensors | Qt Sensors - Maze QML Example | Mouse.qml Example File

Qt 5.7.1 Reference Documentation

# Mouse.qml Example File

maze/Mouse.qml

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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;
          }
      }