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<td >Qt 5.9</td><td ><a href="qtquick-index.html">Qt Quick</a></td><td ><a href="qtquick-tutorials-samegame-samegame3-example.html">QML Advanced Tutorial 3 - Implementing the Game Logic</a></td><td >samegame.js Example File</td></tr></table><table class="buildversion"><tr>
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<h1 class="title">samegame.js Example File</h1>
<span class="subtitle">tutorials/samegame/samegame3/samegame.js</span>
<!-- $$$tutorials/samegame/samegame3/samegame.js-description -->
<div class="descr"> <a name="details"></a>
<pre class="js">
<span class="comment">/* This script file handles the game logic */</span>
var <span class="name">maxColumn</span> = <span class="number">10</span>;
var <span class="name">maxRow</span> = <span class="number">15</span>;
var <span class="name">maxIndex</span> = <span class="name">maxColumn</span> <span class="operator">*</span> <span class="name">maxRow</span>;
var <span class="name">board</span> = new <span class="name">Array</span>(<span class="name">maxIndex</span>);
var <span class="name">component</span>;
<span class="comment">//Index function used instead of a 2D array</span>
<span class="keyword">function</span> <span class="name">index</span>(<span class="name">column</span>, row) {
<span class="keyword">return</span> <span class="name">column</span> <span class="operator">+</span> (<span class="name">row</span> <span class="operator">*</span> <span class="name">maxColumn</span>);
}
<span class="keyword">function</span> <span class="name">startNewGame</span>() {
<span class="comment">//Calculate board size</span>
<span class="name">maxColumn</span> <span class="operator">=</span> <span class="name">Math</span>.<span class="name">floor</span>(<span class="name">gameCanvas</span>.<span class="name">width</span> <span class="operator">/</span> <span class="name">gameCanvas</span>.<span class="name">blockSize</span>);
<span class="name">maxRow</span> <span class="operator">=</span> <span class="name">Math</span>.<span class="name">floor</span>(<span class="name">gameCanvas</span>.<span class="name">height</span> <span class="operator">/</span> <span class="name">gameCanvas</span>.<span class="name">blockSize</span>);
<span class="name">maxIndex</span> <span class="operator">=</span> <span class="name">maxRow</span> <span class="operator">*</span> <span class="name">maxColumn</span>;
<span class="comment">//Close dialogs</span>
<span class="name">dialog</span>.<span class="name">hide</span>();
<span class="comment">//Initialize Board</span>
<span class="name">board</span> <span class="operator">=</span> new <span class="name">Array</span>(<span class="name">maxIndex</span>);
<span class="name">gameCanvas</span>.<span class="name">score</span> <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">for</span> (<span class="keyword">var</span> <span class="name">column</span> = <span class="number">0</span>; <span class="name">column</span> <span class="operator"><</span> <span class="name">maxColumn</span>; column++) {
<span class="keyword">for</span> (<span class="keyword">var</span> <span class="name">row</span> = <span class="number">0</span>; <span class="name">row</span> <span class="operator"><</span> <span class="name">maxRow</span>; row++) {
<span class="name">board</span>[<span class="name">index</span>(<span class="name">column</span>, <span class="name">row</span>)] <span class="operator">=</span> <span class="number">null</span>;
<span class="name">createBlock</span>(<span class="name">column</span>, <span class="name">row</span>);
}
}
}
<span class="keyword">function</span> <span class="name">createBlock</span>(<span class="name">column</span>, row) {
<span class="keyword">if</span> (<span class="name">component</span> <span class="operator">==</span> <span class="number">null</span>)
<span class="name">component</span> <span class="operator">=</span> <span class="name">Qt</span>.<span class="name">createComponent</span>(<span class="string">"Block.qml"</span>);
<span class="comment">// Note that if Block.qml was not a local file, component.status would be</span>
<span class="comment">// Loading and we should wait for the component's statusChanged() signal to</span>
<span class="comment">// know when the file is downloaded and ready before calling createObject().</span>
<span class="keyword">if</span> (<span class="name">component</span>.<span class="name">status</span> <span class="operator">==</span> <span class="name">Component</span>.<span class="name">Ready</span>) {
var <span class="name">dynamicObject</span> = <span class="name">component</span>.<span class="name">createObject</span>(<span class="name">gameCanvas</span>);
<span class="keyword">if</span> (<span class="name">dynamicObject</span> <span class="operator">==</span> <span class="number">null</span>) {
<span class="name">console</span>.<span class="name">log</span>(<span class="string">"error creating block"</span>);
<span class="name">console</span>.<span class="name">log</span>(<span class="name">component</span>.<span class="name">errorString</span>());
<span class="keyword">return</span> <span class="number">false</span>;
}
<span class="name">dynamicObject</span>.<span class="name">type</span> <span class="operator">=</span> <span class="name">Math</span>.<span class="name">floor</span>(<span class="name">Math</span>.<span class="name">random</span>() <span class="operator">*</span> <span class="number">3</span>);
<span class="name">dynamicObject</span>.<span class="name">x</span> <span class="operator">=</span> <span class="name">column</span> <span class="operator">*</span> <span class="name">gameCanvas</span>.<span class="name">blockSize</span>;
<span class="name">dynamicObject</span>.<span class="name">y</span> <span class="operator">=</span> <span class="name">row</span> <span class="operator">*</span> <span class="name">gameCanvas</span>.<span class="name">blockSize</span>;
<span class="name">dynamicObject</span>.<span class="name">width</span> <span class="operator">=</span> <span class="name">gameCanvas</span>.<span class="name">blockSize</span>;
<span class="name">dynamicObject</span>.<span class="name">height</span> <span class="operator">=</span> <span class="name">gameCanvas</span>.<span class="name">blockSize</span>;
<span class="name">board</span>[<span class="name">index</span>(<span class="name">column</span>, <span class="name">row</span>)] <span class="operator">=</span> <span class="name">dynamicObject</span>;
} <span class="keyword">else</span> {
<span class="name">console</span>.<span class="name">log</span>(<span class="string">"error loading block component"</span>);
<span class="name">console</span>.<span class="name">log</span>(<span class="name">component</span>.<span class="name">errorString</span>());
<span class="keyword">return</span> <span class="number">false</span>;
}
<span class="keyword">return</span> <span class="number">true</span>;
}
var <span class="name">fillFound</span>; <span class="comment">//Set after a floodFill call to the number of blocks found</span>
var <span class="name">floodBoard</span>; <span class="comment">//Set to 1 if the floodFill reaches off that node</span>
<span class="keyword">function</span> <span class="name">handleClick</span>(<span class="name">xPos</span>, yPos) {
var <span class="name">column</span> = <span class="name">Math</span>.<span class="name">floor</span>(<span class="name">xPos</span> <span class="operator">/</span> <span class="name">gameCanvas</span>.<span class="name">blockSize</span>);
var <span class="name">row</span> = <span class="name">Math</span>.<span class="name">floor</span>(<span class="name">yPos</span> <span class="operator">/</span> <span class="name">gameCanvas</span>.<span class="name">blockSize</span>);
<span class="keyword">if</span> (<span class="name">column</span> <span class="operator">>=</span> <span class="name">maxColumn</span> <span class="operator">||</span> <span class="name">column</span> <span class="operator"><</span> <span class="number">0</span> <span class="operator">||</span> <span class="name">row</span> <span class="operator">>=</span> <span class="name">maxRow</span> <span class="operator">||</span> <span class="name">row</span> <span class="operator"><</span> <span class="number">0</span>)
<span class="keyword">return</span>;
<span class="keyword">if</span> (<span class="name">board</span>[<span class="name">index</span>(<span class="name">column</span>, <span class="name">row</span>)] <span class="operator">==</span> <span class="number">null</span>)
<span class="keyword">return</span>;
<span class="comment">//If it's a valid block, remove it and all connected (does nothing if it's not connected)</span>
<span class="name">floodFill</span>(<span class="name">column</span>, <span class="name">row</span>, -<span class="number">1</span>);
<span class="keyword">if</span> (<span class="name">fillFound</span> <span class="operator"><=</span> <span class="number">0</span>)
<span class="keyword">return</span>;
<span class="name">gameCanvas</span>.<span class="name">score</span> <span class="operator">+=</span> (<span class="name">fillFound</span> <span class="operator">-</span> <span class="number">1</span>) <span class="operator">*</span> (<span class="name">fillFound</span> <span class="operator">-</span> <span class="number">1</span>);
<span class="name">shuffleDown</span>();
<span class="name">victoryCheck</span>();
}
<span class="keyword">function</span> <span class="name">floodFill</span>(<span class="name">column</span>, row, type) {
<span class="keyword">if</span> (<span class="name">board</span>[<span class="name">index</span>(<span class="name">column</span>, <span class="name">row</span>)] <span class="operator">==</span> <span class="number">null</span>)
<span class="keyword">return</span>;
var <span class="name">first</span> = <span class="number">false</span>;
<span class="keyword">if</span> (<span class="name">type</span> <span class="operator">==</span> -<span class="number">1</span>) {
<span class="name">first</span> <span class="operator">=</span> <span class="number">true</span>;
<span class="name">type</span> <span class="operator">=</span> <span class="name">board</span>[<span class="name">index</span>(<span class="name">column</span>, <span class="name">row</span>)].<span class="name">type</span>;
<span class="comment">//Flood fill initialization</span>
<span class="name">fillFound</span> <span class="operator">=</span> <span class="number">0</span>;
<span class="name">floodBoard</span> <span class="operator">=</span> new <span class="name">Array</span>(<span class="name">maxIndex</span>);
}
<span class="keyword">if</span> (<span class="name">column</span> <span class="operator">>=</span> <span class="name">maxColumn</span> <span class="operator">||</span> <span class="name">column</span> <span class="operator"><</span> <span class="number">0</span> <span class="operator">||</span> <span class="name">row</span> <span class="operator">>=</span> <span class="name">maxRow</span> <span class="operator">||</span> <span class="name">row</span> <span class="operator"><</span> <span class="number">0</span>)
<span class="keyword">return</span>;
<span class="keyword">if</span> (<span class="name">floodBoard</span>[<span class="name">index</span>(<span class="name">column</span>, <span class="name">row</span>)] <span class="operator">==</span> <span class="number">1</span> <span class="operator">||</span> (!<span class="name">first</span> <span class="operator">&&</span> <span class="name">type</span> <span class="operator">!=</span> <span class="name">board</span>[<span class="name">index</span>(<span class="name">column</span>, <span class="name">row</span>)].<span class="name">type</span>))
<span class="keyword">return</span>;
<span class="name">floodBoard</span>[<span class="name">index</span>(<span class="name">column</span>, <span class="name">row</span>)] <span class="operator">=</span> <span class="number">1</span>;
<span class="name">floodFill</span>(<span class="name">column</span> <span class="operator">+</span> <span class="number">1</span>, <span class="name">row</span>, <span class="name">type</span>);
<span class="name">floodFill</span>(<span class="name">column</span> <span class="operator">-</span> <span class="number">1</span>, <span class="name">row</span>, <span class="name">type</span>);
<span class="name">floodFill</span>(<span class="name">column</span>, <span class="name">row</span> <span class="operator">+</span> <span class="number">1</span>, <span class="name">type</span>);
<span class="name">floodFill</span>(<span class="name">column</span>, <span class="name">row</span> <span class="operator">-</span> <span class="number">1</span>, <span class="name">type</span>);
<span class="keyword">if</span> (<span class="name">first</span> <span class="operator">==</span> <span class="number">true</span> <span class="operator">&&</span> <span class="name">fillFound</span> <span class="operator">==</span> <span class="number">0</span>)
<span class="keyword">return</span>; <span class="comment">//Can't remove single blocks</span>
<span class="name">board</span>[<span class="name">index</span>(<span class="name">column</span>, <span class="name">row</span>)].<span class="name">opacity</span> <span class="operator">=</span> <span class="number">0</span>;
<span class="name">board</span>[<span class="name">index</span>(<span class="name">column</span>, <span class="name">row</span>)] <span class="operator">=</span> <span class="number">null</span>;
<span class="name">fillFound</span> <span class="operator">+=</span> <span class="number">1</span>;
}
<span class="keyword">function</span> <span class="name">shuffleDown</span>() {
<span class="comment">//Fall down</span>
<span class="keyword">for</span> (<span class="keyword">var</span> <span class="name">column</span> = <span class="number">0</span>; <span class="name">column</span> <span class="operator"><</span> <span class="name">maxColumn</span>; column++) {
var <span class="name">fallDist</span> = <span class="number">0</span>;
<span class="keyword">for</span> (<span class="keyword">var</span> <span class="name">row</span> = <span class="name">maxRow</span> <span class="operator">-</span> <span class="number">1</span>; <span class="name">row</span> <span class="operator">>=</span> <span class="number">0</span>; row--) {
<span class="keyword">if</span> (<span class="name">board</span>[<span class="name">index</span>(<span class="name">column</span>, <span class="name">row</span>)] <span class="operator">==</span> <span class="number">null</span>) {
<span class="name">fallDist</span> <span class="operator">+=</span> <span class="number">1</span>;
} <span class="keyword">else</span> {
<span class="keyword">if</span> (<span class="name">fallDist</span> <span class="operator">></span> <span class="number">0</span>) {
var <span class="name">obj</span> = <span class="name">board</span>[<span class="name">index</span>(<span class="name">column</span>, <span class="name">row</span>)];
<span class="name">obj</span>.<span class="name">y</span> <span class="operator">+=</span> <span class="name">fallDist</span> <span class="operator">*</span> <span class="name">gameCanvas</span>.<span class="name">blockSize</span>;
<span class="name">board</span>[<span class="name">index</span>(<span class="name">column</span>, <span class="name">row</span> <span class="operator">+</span> <span class="name">fallDist</span>)] <span class="operator">=</span> <span class="name">obj</span>;
<span class="name">board</span>[<span class="name">index</span>(<span class="name">column</span>, <span class="name">row</span>)] <span class="operator">=</span> <span class="number">null</span>;
}
}
}
}
<span class="comment">//Fall to the left</span>
var <span class="name">fallDist</span> = <span class="number">0</span>;
<span class="keyword">for</span> (<span class="keyword">var</span> <span class="name">column</span> = <span class="number">0</span>; <span class="name">column</span> <span class="operator"><</span> <span class="name">maxColumn</span>; column++) {
<span class="keyword">if</span> (<span class="name">board</span>[<span class="name">index</span>(<span class="name">column</span>, <span class="name">maxRow</span> <span class="operator">-</span> <span class="number">1</span>)] <span class="operator">==</span> <span class="number">null</span>) {
<span class="name">fallDist</span> <span class="operator">+=</span> <span class="number">1</span>;
} <span class="keyword">else</span> {
<span class="keyword">if</span> (<span class="name">fallDist</span> <span class="operator">></span> <span class="number">0</span>) {
<span class="keyword">for</span> (<span class="keyword">var</span> <span class="name">row</span> = <span class="number">0</span>; <span class="name">row</span> <span class="operator"><</span> <span class="name">maxRow</span>; row++) {
var <span class="name">obj</span> = <span class="name">board</span>[<span class="name">index</span>(<span class="name">column</span>, <span class="name">row</span>)];
<span class="keyword">if</span> (<span class="name">obj</span> <span class="operator">==</span> <span class="number">null</span>)
<span class="keyword">continue</span>;
<span class="name">obj</span>.<span class="name">x</span> <span class="operator">-=</span> <span class="name">fallDist</span> <span class="operator">*</span> <span class="name">gameCanvas</span>.<span class="name">blockSize</span>;
<span class="name">board</span>[<span class="name">index</span>(<span class="name">column</span> <span class="operator">-</span> <span class="name">fallDist</span>, <span class="name">row</span>)] <span class="operator">=</span> <span class="name">obj</span>;
<span class="name">board</span>[<span class="name">index</span>(<span class="name">column</span>, <span class="name">row</span>)] <span class="operator">=</span> <span class="number">null</span>;
}
}
}
}
}
<span class="keyword">function</span> <span class="name">victoryCheck</span>() {
<span class="comment">//Award bonus points if no blocks left</span>
var <span class="name">deservesBonus</span> = <span class="number">true</span>;
<span class="keyword">for</span> (<span class="keyword">var</span> <span class="name">column</span> = <span class="name">maxColumn</span> <span class="operator">-</span> <span class="number">1</span>; <span class="name">column</span> <span class="operator">>=</span> <span class="number">0</span>; column--)
<span class="keyword">if</span> (<span class="name">board</span>[<span class="name">index</span>(<span class="name">column</span>, <span class="name">maxRow</span> <span class="operator">-</span> <span class="number">1</span>)] <span class="operator">!=</span> <span class="number">null</span>)
<span class="name">deservesBonus</span> <span class="operator">=</span> <span class="number">false</span>;
<span class="keyword">if</span> (<span class="name">deservesBonus</span>)
<span class="name">gameCanvas</span>.<span class="name">score</span> <span class="operator">+=</span> <span class="number">500</span>;
<span class="comment">//Check whether game has finished</span>
<span class="keyword">if</span> (<span class="name">deservesBonus</span> <span class="operator">||</span> !(<span class="name">floodMoveCheck</span>(<span class="number">0</span>, <span class="name">maxRow</span> <span class="operator">-</span> <span class="number">1</span>, -<span class="number">1</span>)))
<span class="name">dialog</span>.<span class="name">show</span>(<span class="string">"Game Over. Your score is "</span> <span class="operator">+</span> <span class="name">gameCanvas</span>.<span class="name">score</span>);
}
<span class="comment">//only floods up and right, to see if it can find adjacent same-typed blocks</span>
<span class="keyword">function</span> <span class="name">floodMoveCheck</span>(<span class="name">column</span>, row, type) {
<span class="keyword">if</span> (<span class="name">column</span> <span class="operator">>=</span> <span class="name">maxColumn</span> <span class="operator">||</span> <span class="name">column</span> <span class="operator"><</span> <span class="number">0</span> <span class="operator">||</span> <span class="name">row</span> <span class="operator">>=</span> <span class="name">maxRow</span> <span class="operator">||</span> <span class="name">row</span> <span class="operator"><</span> <span class="number">0</span>)
<span class="keyword">return</span> <span class="number">false</span>;
<span class="keyword">if</span> (<span class="name">board</span>[<span class="name">index</span>(<span class="name">column</span>, <span class="name">row</span>)] <span class="operator">==</span> <span class="number">null</span>)
<span class="keyword">return</span> <span class="number">false</span>;
var <span class="name">myType</span> = <span class="name">board</span>[<span class="name">index</span>(<span class="name">column</span>, <span class="name">row</span>)].<span class="name">type</span>;
<span class="keyword">if</span> (<span class="name">type</span> <span class="operator">==</span> <span class="name">myType</span>)
<span class="keyword">return</span> <span class="number">true</span>;
<span class="keyword">return</span> <span class="name">floodMoveCheck</span>(<span class="name">column</span> <span class="operator">+</span> <span class="number">1</span>, <span class="name">row</span>, <span class="name">myType</span>) <span class="operator">||</span> <span class="name">floodMoveCheck</span>(<span class="name">column</span>, <span class="name">row</span> <span class="operator">-</span> <span class="number">1</span>, <span class="name">board</span>[<span class="name">index</span>(<span class="name">column</span>, <span class="name">row</span>)].<span class="name">type</span>);
}
</pre>
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<!-- @@@tutorials/samegame/samegame3/samegame.js -->
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