GameCanvas.qml Example File

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  import QtQuick 2.0
  import "logic.js" as Logic
  import "towers" as Towers

  Item {
      id: grid

      property int squareSize: 64
      property int rows: 6
      property int cols: 4
      property Item canvas: grid
      property int score: 0
      property int coins: 100
      property int lives: 3
      property int waveNumber: 0
      property int waveProgress: 0
      property var towers
      property var mobs
      property bool gameRunning: false
      property bool gameOver: false
      property bool errored: false
      property string errorString: ""

      width: cols * squareSize
      height: rows * squareSize

      function freshState() {
          lives = 3
          coins = 100
          score = 0
          waveNumber = 0
          waveProgress = 0
          gameOver = false
          gameRunning = false
          towerMenu.shown = false
          helpButton.comeBack();
      }

      Text {
          id: errorText // Mostly for debug purposes
          text: errorString
          visible: errored
          color: "red"
          font.pixelSize: 18
          wrapMode: Text.WordWrap
          width: parent.width / 1.2
          height: parent.height / 1.2
          anchors.centerIn: parent
          z: 1000
      }

      Timer {
          interval: 16
          running: true
          repeat: true
          onTriggered: Logic.tick()
      }

      MouseArea {
          id: ma
          anchors.fill: parent
          onClicked: {
              if (towerMenu.visible)
                  towerMenu.finish()
              else
                  towerMenu.open(mouse.x, mouse.y)
          }
      }

      Image {
          id: towerMenu
          visible: false
          z: 1500
          scale: 0.9
          opacity: 0.7
          property int dragDistance: 16
          property int targetRow: 0
          property int targetCol: 0
          property bool shown: false
          property bool towerExists: false

          function finish() {
              shown = false
          }

          function open(xp,yp) {
              if (!grid.gameRunning)
                  return
              targetRow = Logic.row(yp)
              targetCol = Logic.col(xp)
              if (targetRow == 0)
                  towerMenu.y = (targetRow + 1) * grid.squareSize
              else
                  towerMenu.y = (targetRow - 1) * grid.squareSize
              towerExists = (grid.towers[Logic.towerIdx(targetCol, targetRow)] != null)
              shown = true
              helpButton.goAway();
          }

          states: State {
              name: "shown"; when: towerMenu.shown && !grid.gameOver
              PropertyChanges { target: towerMenu; visible: true; scale: 1; opacity: 1 }
          }

          transitions: Transition {
              PropertyAction { property: "visible" }
              NumberAnimation { properties: "opacity,scale"; duration: 500; easing.type: Easing.OutElastic }
          }

          x: -32
          source: "gfx/dialog.png"
          Row {
              id: buttonRow
              height: 100
              anchors.centerIn: parent
              spacing: 8
              BuildButton {
                  row: towerMenu.targetRow; col: towerMenu.targetCol
                  anchors.verticalCenter: parent.verticalCenter
                  towerType: 1; index: 0
                  canBuild: !towerMenu.towerExists
                  source: "gfx/dialog-melee.png"
                  onClicked: towerMenu.finish()
              }
              BuildButton {
                  row: towerMenu.targetRow; col: towerMenu.targetCol
                  anchors.verticalCenter: parent.verticalCenter
                  towerType: 2; index: 1
                  canBuild: !towerMenu.towerExists
                  source: "gfx/dialog-shooter.png"
                  onClicked: towerMenu.finish()
              }
              BuildButton {
                  row: towerMenu.targetRow; col: towerMenu.targetCol
                  anchors.verticalCenter: parent.verticalCenter
                  towerType: 3; index: 2
                  canBuild: !towerMenu.towerExists
                  source: "gfx/dialog-bomb.png"
                  onClicked: towerMenu.finish()
              }
              BuildButton {
                  row: towerMenu.targetRow; col: towerMenu.targetCol
                  anchors.verticalCenter: parent.verticalCenter
                  towerType: 4; index: 3
                  canBuild: !towerMenu.towerExists
                  source: "gfx/dialog-factory.png"
                  onClicked: towerMenu.finish()
              }
          }
      }

      Keys.onPressed: { // Cheat Codes while Testing
          if (event.key == Qt.Key_Up && (event.modifiers & Qt.ShiftModifier))
              grid.coins += 10;
          if (event.key == Qt.Key_Left && (event.modifiers & Qt.ShiftModifier))
              grid.lives += 1;
          if (event.key == Qt.Key_Down && (event.modifiers & Qt.ShiftModifier))
              Logic.gameState.waveProgress += 1000;
          if (event.key == Qt.Key_Right && (event.modifiers & Qt.ShiftModifier))
              Logic.endGame();
      }

      Image {
          id: helpButton
          z: 1010
          source: "gfx/button-help.png"
          function goAway() {
              helpMA.enabled = false;
              helpButton.opacity = 0;
          }
          function comeBack() {
              helpMA.enabled = true;
              helpButton.opacity = 1;
          }
          Behavior on opacity { NumberAnimation {} }
          MouseArea {
              id: helpMA
              anchors.fill: parent
              onClicked: {helpImage.visible = true; helpButton.visible = false;}
          }

          anchors.horizontalCenter: parent.horizontalCenter
          anchors.bottom: parent.bottom
          anchors.bottomMargin: 0
      }

      Image {
          id: helpImage
          z: 1010
          source: "gfx/help.png"
          anchors.fill: parent
          visible: false
          MouseArea {
              anchors.fill: parent
              onClicked: helpImage.visible = false;
          }
      }

  }