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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/ge/ge_rotate.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">任意角度旋转</h1><div class="date inPage">20 Nov 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d249082e23__20250121171702">进行任意角度旋转的时候可以进行 blending，并且可以指定原图和目标图的旋转中心，任意角度旋转原图和目标图都只支持 RGB 格式。
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其中旋转角度传给驱动的是旋转角度的 sin 和 cos 值，为 2.12 定点数，其中小数部分 12bits ，则应用程序计算 sin 和 cos 值的方法如下：</p><div class="- topic/p p" data-ofbid="d249082e25__20250121171702"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="ge_任意角度旋转_0__image_t4v_fhb_d1c" src="../../../images/ge/ge_function_rot.png" alt="ge_function_rot"/></div><br/></div><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="ge_任意角度旋转_0__codeblock_ec3_ghb_d1c" data-ofbid="ge_任意角度旋转_0__codeblock_ec3_ghb_d1c">#include <stdio.h>
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#include <math.h>
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#<span class="hl-directive">define</span> PI <span class="hl-number">3.14159265</span>
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#<span class="hl-directive">define</span> SIN(x) (sin(x* PI / <span class="hl-number">180.0</span>))
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#<span class="hl-directive">define</span> COS(x) (cos(x* PI / <span class="hl-number">180.0</span>))
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<strong class="hl-keyword">double</strong> degree = <span class="hl-number">30.0</span> <em class="hl-comment">// (0 <= degree < 360)</em>
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angle_sin = (<strong class="hl-keyword">int</strong>)(SIN(x) * <span class="hl-number">4096</span>);
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angle_cos = (<strong class="hl-keyword">int</strong>)(COS(x) * <span class="hl-number">4096</span>);
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<em class="hl-comment">// 应用程序也可以预先生成需要的角度的 sin 和 cos 值列表，通过查表减小计算量</em></pre></div></article></main></div>
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