QT AGIStudio allows AGI games to be created or edited.
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qt-agistudio/help/overlay_pic.html

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<TITLE>overlay.pic</TITLE></HEAD>
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<h1>overlay.pic</h1>
<B>Category</B><p>
<a href="picture_commands.html">Picture commands</a><p>
<B>Syntax</B><p>
<p>
overlay.pic(vA);<p>
<B>Description</B><p>
<p>
overlay.pic does the same thing as <a href="draw_pic.html">draw.pic</a>, except that the visual and priority screens are not cleared. This means that picture vA is drawn on top of the existing picture. Note that
because fills only work on white surfaces, fills in picture vA which are not on a white part of the existing picture wont work. It's generally best not to use fills in pictures that you intend to
overlay.
<p>
Remember to use <a href="show_pic.html">show.pic</a> to update the screen once the picture has been overlayed.<p>
Make sure the picture is loaded into memory before overlaying it.<p>
<B>See also</B><p>
<a href="draw_pic.html">draw.pic</a><p>
<a href="load_pic.html">load.pic</a><p>
<a href="drawing_pictures.html">Drawing pictures</a><p>
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