Qt 5.6 | Qt Quick | Qt Quick Demo - Maroon in Trouble | logic.js Example File

Qt 5.6.3 Reference Documentation

# logic.js Example File

demos/maroon/content/logic.js

      /****************************************************************************
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      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Contact: http://www.qt.io/licensing/
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      ** This file is part of the examples of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
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      **     from this software without specific prior written permission.
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      .pragma library // Shared game state
      .import QtQuick 2.0 as QQ

      // Game Stuff
      var gameState // Local reference
      function getGameState() { return gameState; }

      var towerData = [ // Name and cost, stats are in the delegate per instance
          { "name": "Melee", "cost": 20 },
          { "name": "Ranged", "cost": 50 },
          { "name": "Bomb", "cost": 75 },
          { "name": "Factory", "cost": 25 }
      ]

      var waveBaseData = [300, 290, 280, 270, 220, 180, 160, 80, 80, 80, 30, 30, 30, 30];
      var waveData = [];

      var towerComponents = new Array(towerData.length);
      var mobComponent = Qt.createComponent("mobs/MobBase.qml");

      function endGame()
      {
          gameState.gameRunning = false;
          gameState.gameOver = true;
          for (var i = 0; i < gameState.cols; i++) {
              for (var j = 0; j < gameState.rows; j++) {
                  if (gameState.towers[towerIdx(i, j)]) {
                      gameState.towers[towerIdx(i, j)].destroy();
                      gameState.towers[towerIdx(i, j)] = null;
                  }
              }
              for (var j in gameState.mobs[i])
                  gameState.mobs[i][j].destroy();
              gameState.mobs[i].splice(0,gameState.mobs[i].length); //Leaves queue reusable
          }
      }

      function startGame(gameCanvas)
      {
          waveData = new Array();
          for (var i in waveBaseData)
              waveData[i] = waveBaseData[i];
          gameState.freshState();
          for (var i = 0; i < gameCanvas.cols; i++) {
              for (var j = 0; j < gameCanvas.rows; j++)
                  gameState.towers[towerIdx(i, j)] = null;
              gameState.mobs[i] = new Array();
          }
          gameState.towers[towerIdx(0, 0)] = newTower(3, 0, 0);//Start with a starfish in the corner
          gameState.gameRunning = true;
          gameState.gameOver = false;
      }

      function newGameState(gameCanvas)
      {
          for (var i = 0; i < towerComponents.length; i++) {
              towerComponents[i] = Qt.createComponent("towers/" + towerData[i].name + ".qml");
              if (towerComponents[i].status == QQ.Component.Error) {
                  gameCanvas.errored = true;
                  gameCanvas.errorString += "Loading Tower " + towerData[i].name + "\n" + (towerComponents[i].errorString());
                  console.log(towerComponents[i].errorString());
              }
          }
          gameState = gameCanvas;
          gameState.freshState();
          gameState.towers = new Array(gameCanvas.rows * gameCanvas.cols);
          gameState.mobs = new Array(gameCanvas.cols);
          return gameState;
      }

      function row(y)
      {
          return Math.floor(y / gameState.squareSize);
      }

      function col(x)
      {
          return Math.floor(x / gameState.squareSize);
      }

      function towerIdx(x, y)
      {
          return y + (x * gameState.rows);
      }

      function newMob(col)
      {
          var ret = mobComponent.createObject(gameState.canvas,
              { "col" : col,
                "speed" : (Math.min(2.0, 0.10 * (gameState.waveNumber + 1))),
                "y" : gameState.canvas.height });
          gameState.mobs[col].push(ret);
          return ret;
      }

      function newTower(type, row, col)
      {
          var ret = towerComponents[type].createObject(gameState.canvas);
          ret.row = row;
          ret.col = col;
          ret.fireCounter = ret.rof;
          ret.spawn();
          return ret;
      }

      function buildTower(type, x, y)
      {
          if (gameState.towers[towerIdx(x,y)] != null) {
              if (type <= 0) {
                  gameState.towers[towerIdx(x,y)].sell();
                  gameState.towers[towerIdx(x,y)] = null;
              }
          } else {
              if (gameState.coins < towerData[type - 1].cost)
                  return;
              gameState.towers[towerIdx(x, y)] = newTower(type - 1, y, x);
              gameState.coins -= towerData[type - 1].cost;
          }
      }

      function killMob(col, mob)
      {
          if (!mob)
              return;
          var idx = gameState.mobs[col].indexOf(mob);
          if (idx == -1 || !mob.hp)
              return;
          mob.hp = 0;
          mob.die();
          gameState.mobs[col].splice(idx,1);
      }

      function killTower(row, col)
      {
          var tower = gameState.towers[towerIdx(col, row)];
          if (!tower)
              return;
          tower.hp = 0;
          tower.die();
          gameState.towers[towerIdx(col, row)] = null;
      }

      function tick()
      {
          if (!gameState.gameRunning)
              return;

          // Spawn
          gameState.waveProgress += 1;
          var i = gameState.waveProgress;
          var j = 0;
          while (i > 0 && j < waveData.length)
              i -= waveData[j++];
          if ( i == 0 ) // Spawn a mob
              newMob(Math.floor(Math.random() * gameState.cols));
          if ( j == waveData.length ) { // Next Wave
              gameState.waveNumber += 1;
              gameState.waveProgress = 0;
              var waveModifier = 10; // Constant governing how much faster the next wave is to spawn (not fish speed)
              for (var k in waveData ) // Slightly faster
                  if (waveData[k] > waveModifier)
                      waveData[k] -= waveModifier;
          }

          // Towers Attack
          for (var j in gameState.towers) {
              var tower = gameState.towers[j];
              if (tower == null)
                  continue;
              if (tower.fireCounter > 0) {
                  tower.fireCounter -= 1;
                  continue;
              }
              var column = tower.col;
              for (var k in gameState.mobs[column]) {
                  var conflict = gameState.mobs[column][k];
                  if (conflict.y <= gameState.canvas.height && conflict.y + conflict.height > tower.y
                      && conflict.y - ((tower.row + 1) * gameState.squareSize) < gameState.squareSize * tower.range) { // In Range
                      tower.fire();
                      tower.fireCounter = tower.rof;
                      conflict.hit(tower.damage);
                  }
              }

              // Income
              if (tower.income) {
                  gameState.coins += tower.income;
                  tower.fire();
                  tower.fireCounter = tower.rof;
              }
          }

          // Mobs move
          for (var i = 0; i < gameState.cols; i++) {
              for (var j = 0; j < gameState.mobs[i].length; j++) {
                  var mob = gameState.mobs[i][j];
                  var newPos = gameState.mobs[i][j].y - gameState.mobs[i][j].speed;
                  if (newPos < 0) {
                      gameState.lives -= 1;
                      killMob(i, mob);
                      if (gameState.lives <= 0)
                          endGame();
                      continue;
                  }
                  var conflict = gameState.towers[towerIdx(i, row(newPos))];
                  if (conflict != null) {
                      if (mob.y < conflict.y + gameState.squareSize)
                          gameState.mobs[i][j].y += gameState.mobs[i][j].speed * 10; // Moved inside tower, now hurry back out
                      if (mob.fireCounter > 0) {
                          mob.fireCounter--;
                      } else {
                          gameState.mobs[i][j].fire();
                          conflict.hp -= mob.damage;
                          if (conflict.hp <= 0)
                              killTower(conflict.row, conflict.col);
                          mob.fireCounter = mob.rof;
                      }
                  } else {
                      gameState.mobs[i][j].y = newPos;
                  }
              }
          }

      }