📄 custom.htm

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<meta name="GENERATOR" content="Microsoft FrontPage 3.0">
<title>Custom transitions</title>
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<h3>Custom transitions</h3>

<p>To create a custom transition you have to derive a new class from one of the available
classes. The root class is <a href="transeff.htm">TTransitionEffect</a>. It handles all
the basics to perform transitions, but it is completely inoperative by itself. All the
transitions derive directly or indirectly from it. In order to configure your custom
transitions you may have to override some virtual methods, depending on your needs. This
methods are:

<ul type="disc">
  <li><a href="transeff.htm#DoExecute">DoExecute</a></li>
  <li>GetPixelFormat</li>
  <li><a href="transeff.htm#NeedDstImage">NeedDstImage</a></li>
  <li><a href="transeff.htm#NeedSrcImage">NeedSrcImage</a></li>
  <li><a href="transeff.htm#RenderWhenClipped">RenderWhenClipped</a></li>
  <li><a href="transeff.htm#TwoPassesCapable">TwoPassesCapable</a></li>
  <li><a href="transeff.htm#UseOffScreenBmp">UseOffScreenBmp</a></li>
</ul>

<p>As an example, we have taken the <a href="shake.htm">TShakeTransition</a> of the Demo
project.</p>

<p>If you want to CPU-independently time your transition you can derive it from <a
href="ttimedte.htm">TTimedTransitionEffect</a> instead. This way you can take advantage of
its built in time handling algorithm. In this case you don't have to override <a
href="transeff.htm#DoExecute">DoExecute</a> because you will use <a href="ttimedte.htm">TTimedTransitionEffect</a>'s
one. Instead, you have to override some of the following methods:

<ul type="disc">
  <li><a href="ttimedte.htm#ExecuteFrame">ExecuteFrame</a></li>
  <li><a href="ttimedte.htm#Finalize">Finalize</a></li>
  <li><a href="ttimedte.htm#Initialize">Initialize</a></li>
</ul>

<p>An example of this is the <a href="simple.htm">TSimpleWipeTransition</a> of the Demo
project.</p>

<p>If you have created nice transitions we could put them into our website.</p>

<p>We are planning to develope many more transitions. If you don't like to create your own
you can always request it to us. We will give preference to the most requested and
interesting ones.</p>
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