Sophie: php-manual-zh-5.2.4-1mdv2008.1 noarch

php-manual-zh-5.2.4-1mdv2008.1.noarch.rpm

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>imagearc</H1
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><P
>    (PHP 3, PHP 4, PHP 5)</P
>imagearc&nbsp;--&nbsp;画椭圆弧</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN86949"
></A
><H2
>说明</H2
>bool <B
CLASS="methodname"
>imagearc</B
> ( resource image, int cx, int cy, int w, int h, int s, int e, int color )<BR
></BR
><P
>&#13;   <B
CLASS="function"
>imagearc()</B
> 以
   <CODE
CLASS="parameter"
>cx</CODE
>，<CODE
CLASS="parameter"
>cy</CODE
>（图像左上角为 0, 0）为中心在
   <CODE
CLASS="parameter"
>image</CODE
> 所代表的图像中画一个椭圆弧。<CODE
CLASS="parameter"
>w</CODE
>
   和 <CODE
CLASS="parameter"
>h</CODE
> 分别指定了椭圆的宽度和高度，起始和结束点以
   <CODE
CLASS="parameter"
>s</CODE
> 和 <CODE
CLASS="parameter"
>e</CODE
>
   参数以角度指定。0°位于三点钟位置，以顺时针方向绘画。
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><B
>例 1. 用 <B
CLASS="function"
>imagearc()</B
> 画一个圆</B
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /></font><font color="#FF8000">// 创建一个 200X200 的图像<br /></font><font color="#0000BB">$img </font><font color="#007700">= </font><font color="#0000BB">imagecreatetruecolor</font><font color="#007700">(</font><font color="#0000BB">200</font><font color="#007700">, </font><font color="#0000BB">200</font><font color="#007700">);<br /></font><font color="#FF8000">// 分配颜色<br /></font><font color="#0000BB">$white </font><font color="#007700">= </font><font color="#0000BB">imagecolorallocate</font><font color="#007700">(</font><font color="#0000BB">$img</font><font color="#007700">, </font><font color="#0000BB">255</font><font color="#007700">, </font><font color="#0000BB">255</font><font color="#007700">, </font><font color="#0000BB">255</font><font color="#007700">);<br /></font><font color="#0000BB">$black </font><font color="#007700">= </font><font color="#0000BB">imagecolorallocate</font><font color="#007700">(</font><font color="#0000BB">$img</font><font color="#007700">, </font><font color="#0000BB">0</font><font color="#007700">, </font><font color="#0000BB">0</font><font color="#007700">, </font><font color="#0000BB">0</font><font color="#007700">);<br /></font><font color="#FF8000">// 画一个黑色的圆<br /></font><font color="#0000BB">imagearc</font><font color="#007700">(</font><font color="#0000BB">$img</font><font color="#007700">, </font><font color="#0000BB">100</font><font color="#007700">, </font><font color="#0000BB">100</font><font color="#007700">, </font><font color="#0000BB">150</font><font color="#007700">, </font><font color="#0000BB">150</font><font color="#007700">, </font><font color="#0000BB">0</font><font color="#007700">, </font><font color="#0000BB">360</font><font color="#007700">, </font><font color="#0000BB">$black</font><font color="#007700">);<br /></font><font color="#FF8000">// 将图像输出到浏览器<br /></font><font color="#0000BB">header</font><font color="#007700">(</font><font color="#DD0000">"Content-type: image/png"</font><font color="#007700">);<br /></font><font color="#0000BB">imagepng</font><font color="#007700">(</font><font color="#0000BB">$img</font><font color="#007700">);<br /></font><font color="#FF8000">// 释放内存<br /></font><font color="#0000BB">imagedestroy</font><font color="#007700">(</font><font color="#0000BB">$img</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
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</code></TD
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>&#13;   参见 <A
HREF="function.imageellipse.html"
><B
CLASS="function"
>imageellipse()</B
></A
>，<A
HREF="function.imagefilledellipse.html"
><B
CLASS="function"
>imagefilledellipse()</B
></A
>
   和 <A
HREF="function.imagefilledarc.html"
><B
CLASS="function"
>imagefilledarc()</B
></A
>。
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