drawImage() ist eine Schlüsselmethode. Sie kann Bilder, Leinwände und Videos einführen und skalieren oder zuschneiden.
JavaScript-CodeInhalt in die Zwischenablage kopieren
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context.drawImage(img,dx,dy);
JavaScript-CodeInhalt in die Zwischenablage kopieren
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context.drawImage(img,dx,dy,dw,dw);
JavaScript-CodeInhalt in die Zwischenablage kopieren
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context.drawImage(img,sx,sy,sw,sh,dx,dy,dw,dh)
Als nächstes versuchen wir, ein Bild zu laden.
JavaScript-CodeInhalt in die Zwischenablage kopieren
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- "zh">
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"UTF-8">
drawImage()
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"canvas-warp"
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<script> <li class="alt"> <span>
</span>
</li> window.onload = <li><span>function</span></li>(){ <li class="alt"> <span>
</span>
</li> <li><span>var</span></li> canvas = document.getElementById(<li class="alt">
<span>"canvas"</span><span class="keyword">); </span> <span>
</span>
</li>canvas.width = 800; <li> <span>
</span><span class="keyword">canvas.height = 600; </span> <span>
</span><span class="string"> </span><span>var</span>
</li> context = canvas.getContext(<li class="alt"><span>"2d"</span></li> <li> <span>
</span>
</li> context.fillStyle = <li class="alt">
<span>"#FFF"</span><span class="keyword"> </span> <span>
</span><span class="string"> context.fillRect(0,0,800,600);
</span><span> </span> </li>
<li>
<span> </span><span class="string">var</span><span> img = </span>
</li>new<li class="alt">
<span> Image(); </span> </li>
<li><span> img.src = </span></li>"./images/20-1.jpg"<li class="alt">
<span>;
</span><span class="keyword"> img.onload = </span><span>Funktion</span><span class="keyword">(){ </span> <span>
</span>
</li> context.drawImage(img,200,50); <li> <span>
</span><span class="string">
</span><span> }; </span> </li>
<li class="alt">
<span></script>
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Laufergebnis:
![2016325103645161.jpg (850×500)](http://files.jb51.net/file_images/article/201603/2016325103645161.jpg?201622510372)
Erstellen Sie einen Fotorahmen:
Hier kombinieren wir clip(), drawImage() und die kubische Bezier-Kurve bezierCurveTo(), um im obigen Fall einen herzförmigen Fotorahmen hinzuzufügen~
JavaScript-CodeInhalt in die Zwischenablage kopieren
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"zh">
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"UTF-8">
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绘制心形相框
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"canvas-warp">
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你的浏览器居然不支持Canvas?!赶快换一个吧!!
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<script> </span> </li>
<li class="alt">
<span> window.onload = </span><span class="keyword">Funktion</span><span>(){ </span> </li>
<li>
<span> </span><span class="keyword">var</span><span> canvas = document.getElementById(</span><span class="string">"canvas"</span><span>); </span> </li>
<li class="alt">
<span> canvas.width = 800; </span> </li>
<li>
<span> canvas.height = 600; </span> </li>
<li class="alt">
<span> </span><span class="keyword">var</span><span> context = canvas.getContext(</span><span class="string">"2d"</span><span>); </span> </li>
<li>
<span> context.fillStyle = </span><span class="string">"#FFF"</span><span>; </span> </li>
<li class="alt">
<span> context.fillRect(0,0,800,600); </span> </li>
<li>
<span> </span> </li>
<li class="alt">
<span> context.beginPath(); </span> </li>
<li>
<span> context.moveTo(400,260); </span> </li>
<li class="alt">
<span> context.bezierCurveTo(450,220,450,300,400,315); </span> </li>
<li>
<span> context.bezierCurveTo(350,300,350,220,400,260); </span> </li>
<li class="alt">
<span> context.clip(); </span> </li>
<li>
<span> context.closePath(); </span> </li>
<li class="alt">
<span> </span> </li>
<li>
<span> </span><span class="keyword">var</span><span> img = </span><span class="keyword">new</span><span> Image(); </span> </li>
<li class="alt">
<span> img.src = </span><span class="string">"./images/20-1.jpg"</span><span>; </span> </li>
<li>
<span> img.onload = </span><span class="keyword">Funktion</span><span>(){ </span> </li>
<li class="alt">
<span> context.drawImage(img,348,240,100,100); </span> </li>
<li>
<span> } </span> </li>
<li class="alt">
<span> }; </span> </li>
<li>
<span></script>
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运行结果:
![2016325103713253.jpg (300×286)](http://files.jb51.net/file_images/article/201603/2016325103713253.jpg?2016225103721)
是不是美美的?好啦, 至此最关键的遮罩和图像裁剪以及说完了, 其实在java.awt中, drawImage()也是一个至关重要的方法.有人说制作Java游戏界面,只要Mit der Funktion „drawImage()“ können Sie die Funktion „DrawImage()“ in der Funktion „Canvas“ verwenden图片的处理就很重要了.即使基本功, 也是对图片最重要的处理方法.