pngencoder.html

java图形报表制作Applet

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<TD><B>Methods inherited from class java.lang.Object</B></TD>
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<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
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<A NAME="BEST_COMPRESSION"><!-- --></A><H3>
BEST_COMPRESSION</H3>
<PRE>
public static final int <B>BEST_COMPRESSION</B></PRE>
<DL>
<DD>The best compression level.</DL>
<HR>

<A NAME="BEST_SPEED"><!-- --></A><H3>
BEST_SPEED</H3>
<PRE>
public static final int <B>BEST_SPEED</B></PRE>
<DL>
<DD>The compression level with the best speed.</DL>
<HR>

<A NAME="COLOR_INDEXED"><!-- --></A><H3>
COLOR_INDEXED</H3>
<PRE>
public static final int <B>COLOR_INDEXED</B></PRE>
<DL>
<DD>Encode the image as a palette indexed image with maximum 256 colors.
 This image type takes less space and is sometimes more efficiently encoded.
 If the original image has more than 256 colors, the image will
 automatically be encoded as a 24bit truecolor image.</DL>
<HR>

<A NAME="COLOR_TRUECOLOR"><!-- --></A><H3>
COLOR_TRUECOLOR</H3>
<PRE>
public static final int <B>COLOR_TRUECOLOR</B></PRE>
<DL>
<DD>Encode the image as 24bit truecolor RGB image with 16,7 million colors.</DL>
<HR>

<A NAME="DEFAULT_COMPRESSION"><!-- --></A><H3>
DEFAULT_COMPRESSION</H3>
<PRE>
public static final int <B>DEFAULT_COMPRESSION</B></PRE>
<DL>
<DD>The default compression level.</DL>

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<A NAME="PngEncoder()"><!-- --></A><H3>
PngEncoder</H3>
<PRE>
public <B>PngEncoder</B>()</PRE>
<DL>
<DD>Creates a new PngEncoder for truecolor images and default compression.</DL>
<HR>

<A NAME="PngEncoder(int)"><!-- --></A><H3>
PngEncoder</H3>
<PRE>
public <B>PngEncoder</B>(int&nbsp;colorType)</PRE>
<DL>
<DD>Creates a new PngEncoder with the specified color type
 and default compression.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>colorType</CODE> - COLOR_TRUECOLOR or COLOR_INDEXED.<DT><B>Throws:</B><DD><CODE>java.lang.IllegalArgumentException</CODE> - If the color type is invalid.</DL>
</DD>
</DL>
<HR>

<A NAME="PngEncoder(int, int)"><!-- --></A><H3>
PngEncoder</H3>
<PRE>
public <B>PngEncoder</B>(int&nbsp;colorType,
                  int&nbsp;compression)</PRE>
<DL>
<DD>Creates a new PngEncoder with the specified color type and compression.
 The less compression, the faster the encoding will be and larger the image.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>colorType</CODE> - COLOR_TRUECOLOR, or COLOR_INDEXED.<DD><CODE>compression</CODE> - The compression level (0-9 or DEFAULT_COMPRESSION, BEST_SPEED, BEST_COMPRESSION).<DT><B>Throws:</B><DD><CODE>java.lang.IllegalArgumentException</CODE> - If the color type or compression level is invalid.</DL>
</DD>
</DL>

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<A NAME="encode(java.awt.Image, java.io.OutputStream)"><!-- --></A><H3>
encode</H3>
<PRE>
public void <B>encode</B>(java.awt.Image&nbsp;image,
                   java.io.OutputStream&nbsp;out)
            throws java.io.IOException</PRE>
<DL>
<DD>Encodes an image to an output stream as a PNG image. 
 It does not close the output stream, this must be done by the caller.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>image</CODE> - the buffered image to encode.<DD><CODE>out</CODE> - the output stream to write the encoded data to.</DL>
</DD>
</DL>
<HR>

<A NAME="getColorType()"><!-- --></A><H3>
getColorType</H3>
<PRE>
public int <B>getColorType</B>()</PRE>
<DL>
<DD>Gets the current image type.<DD><DL>
<DT><B>Returns:</B><DD>COLOR_INDEXED or COLOR_TRUECOLOR.</DL>
</DD>
</DL>
<HR>

<A NAME="getVersion()"><!-- --></A><H3>
getVersion</H3>
<PRE>
public static java.lang.String <B>getVersion</B>()</PRE>
<DL>
<DD>Gets the version number.</DL>
<HR>

<A NAME="main(java.lang.String[])"><!-- --></A><H3>
main</H3>
<PRE>
public static void <B>main</B>(java.lang.String[]&nbsp;argv)</PRE>
<DL>
<DD>Prints out the version number.</DL>
<HR>

<A NAME="setColorType(int)"><!-- --></A><H3>
setColorType</H3>
<PRE>
public void <B>setColorType</B>(int&nbsp;colorType)</PRE>
<DL>
<DD>Sets the encoded image type. Palette indexed images are smaller but can
 contain a maximum of 256 colors. Truecolor images uses one byte per
 pixel and can contain 16,7 million colors, but are larger.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>colorType</CODE> - COLOR_INDEXED or COLOR_TRUECOLOR.<DT><B>Throws:</B><DD><CODE>java.lang.IllegalArgumentException</CODE> - If the color type is invalid.</DL>
</DD>
</DL>
<HR>

<A NAME="setCompression(int)"><!-- --></A><H3>
setCompression</H3>
<PRE>
public void <B>setCompression</B>(int&nbsp;level)</PRE>
<DL>
<DD>Sets the image compression level. The better the compression the
 smaller the image and longer the encoding time.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>level</CODE> - 0-9 or DEFAULT_COMPRESSION, BEST_SPEED, or BEST_COMPRESSION.<DT><B>Throws:</B><DD><CODE>java.lang.IllegalArgumentException</CODE> - If the compression level is invalid.</DL>
</DD>
</DL>
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