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<td >Qt 5.12</td><td ><a href="qtquick-index.html">Qt Quick</a></td><td >Qt Quick Examples - Canvas</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qtquick-index.html">Qt 5.12.6 Reference Documentation</a></td>
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<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#running-the-example">Running the Example</a></li>
<li class="level1"><a href="#red-heart">Red Heart</a></li>
<li class="level1"><a href="#talk-bubble">Talk Bubble</a></li>
<li class="level1"><a href="#squircle">Squircle</a></li>
<li class="level1"><a href="#rounded-rectangle">Rounded Rectangle</a></li>
<li class="level1"><a href="#smile-face">Smile Face</a></li>
<li class="level1"><a href="#clip">Clip</a></li>
<li class="level1"><a href="#tiger">Tiger</a></li>
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<h1 class="title">Qt Quick Examples - Canvas</h1>
<span class="subtitle"></span>
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<p>This is a collection of QML Canvas examples.</p>
<!-- @@@canvas -->
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<div class="descr"> <a name="details"></a>
<p class="centerAlign"><img src="images/qml-canvas-example.png" alt="" /></p><p><i>Canvas</i> is a collection of small QML examples relating to the <a href="qml-qtquick-canvas.html">Canvas</a> type. Each example is a small QML file emphasizing a particular type or feature.</p>
<a name="running-the-example"></a>
<h2 id="running-the-example">Running the Example</h2>
<p>To run the example from Qt Creator, open the <b>Welcome</b> mode and select the example from <b>Examples</b>. For more information, visit Building and Running an Example.</p>
<a name="red-heart"></a>
<h2 id="red-heart">Red Heart</h2>
<p><i>Red heart</i> uses the bezier curve API to stroke and fill a red heart.</p>
<pre class="qml">
ctx.beginPath();
ctx.moveTo(75,40);
ctx.bezierCurveTo(75,37,70,25,50,25);
ctx.bezierCurveTo(20,25,20,62.5,20,62.5);
ctx.bezierCurveTo(20,80,40,102,75,120);
ctx.bezierCurveTo(110,102,130,80,130,62.5);
ctx.bezierCurveTo(130,62.5,130,25,100,25);
ctx.bezierCurveTo(85,25,75,37,75,40);
ctx.closePath();
</pre>
<a name="talk-bubble"></a>
<h2 id="talk-bubble">Talk Bubble</h2>
<p><i>Talk bubble</i> uses the quadraticCurveTo() API to stroke and fill a customized talk bubble:</p>
<pre class="qml">
ctx.beginPath();
ctx.moveTo(75,25);
ctx.quadraticCurveTo(25,25,25,62.5);
ctx.quadraticCurveTo(25,100,50,100);
ctx.quadraticCurveTo(50,120,30,125);
ctx.quadraticCurveTo(60,120,65,100);
ctx.quadraticCurveTo(125,100,125,62.5);
ctx.quadraticCurveTo(125,25,75,25);
ctx.closePath();
</pre>
<p>This example also demonstrates the fillText() API:</p>
<pre class="qml">
ctx.fillStyle = "white";
ctx.font = "bold 17px sans-serif";
ctx.fillText("Qt Quick", 40, 70);
</pre>
<a name="squircle"></a>
<h2 id="squircle">Squircle</h2>
<p><i>Squircle</i> uses a collection of simple moveTo() and lineTo() path APIs to draw a smooth squircle.</p>
<a name="rounded-rectangle"></a>
<h2 id="rounded-rectangle">Rounded Rectangle</h2>
<p><i>Rounded rectangle</i> uses a collection of lineTo() and arcTo() path APIs to draw a rounded rectangle.</p>
<a name="smile-face"></a>
<h2 id="smile-face">Smile Face</h2>
<p><i>Smile face</i> uses several paths to draw and fill a smiling face.</p>
<a name="clip"></a>
<h2 id="clip">Clip</h2>
<p><i>Clip</i> uses the clip API to clip a given image.</p>
<pre class="qml">
ctx.clip();
ctx.drawImage(canvas.imagefile, 0, 0);
</pre>
<a name="tiger"></a>
<h2 id="tiger">Tiger</h2>
<p><i>Tiger</i> uses the SVG path API to draw a tiger with a collection of SVG path strings.</p>
<pre class="qml">
for (var i = 0; i < Tiger.tiger.length; i++) {
if (Tiger.tiger[i].width != undefined)
ctx.lineWidth = Tiger.tiger[i].width;
if (Tiger.tiger[i].path != undefined)
ctx.path = Tiger.tiger[i].path;
if (Tiger.tiger[i].fill != undefined) {
ctx.fillStyle = Tiger.tiger[i].fill;
ctx.fill();
}
if (Tiger.tiger[i].stroke != undefined) {
ctx.strokeStyle = Tiger.tiger[i].stroke;
ctx.stroke();
}
}
</pre>
<p>Files:</p>
<ul>
<li><a href="qtquick-canvas-beziercurve-beziercurve-qml.html">canvas/bezierCurve/bezierCurve.qml</a></li>
<li><a href="qtquick-canvas-canvas-pro.html">canvas/canvas.pro</a></li>
<li><a href="qtquick-canvas-canvas-qml.html">canvas/canvas.qml</a></li>
<li><a href="qtquick-canvas-canvas-qrc.html">canvas/canvas.qrc</a></li>
<li><a href="qtquick-canvas-clip-clip-qml.html">canvas/clip/clip.qml</a></li>
<li><a href="qtquick-canvas-main-cpp.html">canvas/main.cpp</a></li>
<li><a href="qtquick-canvas-quadraticcurveto-quadraticcurveto-qml.html">canvas/quadraticCurveTo/quadraticCurveTo.qml</a></li>
<li><a href="qtquick-canvas-roundedrect-roundedrect-qml.html">canvas/roundedrect/roundedrect.qml</a></li>
<li><a href="qtquick-canvas-smile-smile-qml.html">canvas/smile/smile.qml</a></li>
<li><a href="qtquick-canvas-squircle-squircle-qml.html">canvas/squircle/squircle.qml</a></li>
<li><a href="qtquick-canvas-tiger-tiger-js.html">canvas/tiger/tiger.js</a></li>
<li><a href="qtquick-canvas-tiger-tiger-qml.html">canvas/tiger/tiger.qml</a></li>
</ul>
<p>Images:</p>
<ul>
<li><a href="images/used-in-examples/canvas/contents/qt-logo.png">canvas/contents/qt-logo.png</a></li>
<li><a href="images/used-in-examples/canvas/squircle/squircle.png">canvas/squircle/squircle.png</a></li>
</ul>
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