GameCanvas.qml Example File | Qt Quick 5.9

Qt 5.9 | Qt Quick | Qt Quick Demo - Maroon in Trouble | GameCanvas.qml Example File

Qt 5.9.4 Reference Documentation

# GameCanvas.qml Example File

demos/maroon/content/GameCanvas.qml

      /****************************************************************************
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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;
              }
          }

      }