blocks|key|203622|text|从Java+Game+Engine|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|203623|/**
+*+Converts+a+given+Image+into+a+BufferedImage
+*
+*+@param+img+The+Image+to+be+converted
+*+@return+The+converted+BufferedImage
+*/
public+static+BufferedImage+toBufferedImage(Image+img)
{
++++if+(img+instanceof+BufferedImage)
++++{
++++++++return+(BufferedImage)+img;
++++}

++++//+Create+a+buffered+image+with+transparency
++++BufferedImage+bimage+=+new+BufferedImage(img.getWidth(null),+img.getHeight(null),+BufferedImage.TYPE_INT_ARGB);

++++//+Draw+the+image+on+to+the+buffered+image
++++Graphics2D+bGr+=+bimage.createGraphics();
++++bGr.drawImage(img,+0,+0,+null);
++++bGr.dispose();

++++//+Return+the+buffered+image
++++return+bimage;
}|code-block|syntax|javascript|203624|entityMap|0|LINK|mutability|MUTABLE|url|http://code.google.com/p/game-engine-for-java/source/browse/src/com/gej/util/ImageTool.java#31^0|1|G|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

From a <a href="http://code.google.com/p/game-engine-for-java/source/browse/src/com/gej/util/ImageTool.java#31">Java Game Engine</a>:

<pre><code>/**
 * Converts a given Image into a BufferedImage
 *
 * @param img The Image to be converted
 * @return The converted BufferedImage
 */
public static BufferedImage toBufferedImage(Image img)
{
 if (img instanceof BufferedImage)
 {
 return (BufferedImage) img;
 }

 // Create a buffered image with transparency
 BufferedImage bimage = new BufferedImage(img.getWidth(null), img.getHeight(null), BufferedImage.TYPE_INT_ARGB);

 // Draw the image on to the buffered image
 Graphics2D bGr = bimage.createGraphics();
 bGr.drawImage(img, 0, 0, null);
 bGr.dispose();

 // Return the buffered image
 return bimage;
}
</code></pre>

blocks|key|206051|text|如果您要返回一个sun.awt.image.ToolkitImage，则可以将图像强制转换为该图像，然后使用getBufferedImage()获取BufferedImage。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|206052|因此，你可以这样做，而不是你的最后一行代码。|206053|BufferedImage+buffered+=+((ToolkitImage)+image).getBufferedImage();|code-block|syntax|javascript|206054|entityMap|0|LINK|mutability|MUTABLE|url|http://javasourcecode.org/html/open-source/jdk/jdk-6u23/sun/awt/image/ToolkitImage.html#getBufferedImage%2528%2529^0|8|Q|22|D|1I|I|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|F|3|G|5|6|7|12|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|13|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

If you are getting back a <code>sun.awt.image.ToolkitImage</code>, you can cast the Image to that, and then use <a href="http://javasourcecode.org/html/open-source/jdk/jdk-6u23/sun/awt/image/ToolkitImage.html#getBufferedImage%28%29" rel="nofollow">getBufferedImage()</a> to get the <code>BufferedImage</code>.

So instead of your last line of code where you are casting you would just do:

<pre><code>BufferedImage buffered = ((ToolkitImage) image).getBufferedImage();
</code></pre>

blocks|key|3054815|text|处理这种情况的一种方法是创建一个新的图形，并告诉它的BufferedImage对象将缩放的图像绘制到新的BufferedImage中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3054816|final+float+FACTOR++=+4f;
BufferedImage+img+=+ImageIO.read(new+File("graphic.png"));
int+scaleX+=+(int)+(img.getWidth()+*+FACTOR);
int+scaleY+=+(int)+(img.getHeight()+*+FACTOR);
Image+image+=+img.getScaledInstance(scaleX,+scaleY,+Image.SCALE_SMOOTH);
BufferedImage+buffered+=+new+BufferedImage(scaleX,+scaleY,+TYPE);
buffered.getGraphics().drawImage(image,+0,+0+,+null);|code-block|syntax|javascript|3054817|这应该可以在不进行强制转换的情况下完成此操作。|3054818|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

One way to handle this is to create a new BufferedImage, and tell it's graphics object to draw your scaled image into the new BufferedImage:

<pre><code>final float FACTOR = 4f;
BufferedImage img = ImageIO.read(new File("graphic.png"));
int scaleX = (int) (img.getWidth() * FACTOR);
int scaleY = (int) (img.getHeight() * FACTOR);
Image image = img.getScaledInstance(scaleX, scaleY, Image.SCALE_SMOOTH);
BufferedImage buffered = new BufferedImage(scaleX, scaleY, TYPE);
buffered.getGraphics().drawImage(image, 0, 0 , null);
</code></pre>

That should do the trick without casting.

blocks|key|207932|text|如果你使用Kotlin，你可以用Sri+Harsha建议的相同方式向Image添加一个扩展方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|207933|fun+Image.toBufferedImage():+BufferedImage+{
++++if+(this+is+BufferedImage)+{
++++++++return+this
++++}
++++val+bufferedImage+=+BufferedImage(this.getWidth(null),+this.getHeight(null),+BufferedImage.TYPE_INT_ARGB)

++++val+graphics2D+=+bufferedImage.createGraphics()
++++graphics2D.drawImage(this,+0,+0,+null)
++++graphics2D.dispose()

++++return+bufferedImage
}|code-block|syntax|javascript|207934|并像这样使用它：|207935|myImage.toBufferedImage()|207936|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

If you use Kotlin, you can add an extension method to Image in the same manner Sri Harsha Chilakapati suggests.

<pre><code>fun Image.toBufferedImage(): BufferedImage {
 if (this is BufferedImage) {
 return this
 }
 val bufferedImage = BufferedImage(this.getWidth(null), this.getHeight(null), BufferedImage.TYPE_INT_ARGB)

 val graphics2D = bufferedImage.createGraphics()
 graphics2D.drawImage(this, 0, 0, null)
 graphics2D.dispose()

 return bufferedImage
}
</code></pre>

And use it like this:

<pre><code>myImage.toBufferedImage()
</code></pre>

There is already question like this <a href="https://stackoverflow.com/questions/9132149/how-to-convert-buffered-image-to-image-and-vice-versa">link</a> on StackOverflow and the accepted answer is "casting":

<pre><code>Image image = ImageIO.read(new File(file));
BufferedImage buffered = (BufferedImage) image;
</code></pre>

In my program I try:

<pre><code>final float FACTOR = 4f;
BufferedImage img = ImageIO.read(new File("graphic.png"));
int scaleX = (int) (img.getWidth() * FACTOR);
int scaleY = (int) (img.getHeight() * FACTOR);
Image image = img.getScaledInstance(scaleX, scaleY, Image.SCALE_SMOOTH);
BufferedImage buffered = (BufferedImage) image;
</code></pre>

Unfortunatelly I get run time error: 

<blockquote>
 sun.awt.image.ToolkitImage cannot be cast to java.awt.image.BufferedImage
</blockquote>

Obviously casting does not work. 
Question is: What is (or is there) the proper way of converting Image to BufferedImage?

Java converting Image to BufferedImage

Kotlin

StackOverflow上已经有类似这样的问题了，公认的答案是"casting"：Image image = ImageIO.read(new File(file));BufferedImage buffered = (BufferedImage) image;在我的程序中，我尝试：final float FACTO...

问Java将图像转换为BufferedImage
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