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<H2><A NAME="7_5">7.5 How does StrokeCSIM() work?</A></H2>
<P> Knowledge of the exact technical details of the way StrokeCSIM()
 works is probably not needed by many people but for completeness we
 outline those details in this short section.</P>
<P> The fundamental issue we have to solve is that we must be able to
 call the image script in two modes. When the user includes the image
 script the StrokeCSIM() method should return the HTML page but when the
 image script is later called directly in the image tag it must not
 return an HTML page but rather the actual image.</P>
<P> The way this is solved is by using one HTTP argument which is passed
 on automatically when we use the image script name in the image-tag.</P>
<P> If you look at the generated HTML you will see that the argument to
 the src-property of the image tag is not simply the script name but the
 script name with a additional argument.</P>
<P> In the JpGraph internal code this pre-defined argument is checked
 for and if it exists the image is send back and not the HTML page.</P>
<P> The name of this argument is defined by a DEFINE() statement in
 JpGraph. The define is _CSIM_DISPLAY.</P>
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