ImageGear for C and C++ on Windows v19.10 - Updated
Using Function Calls
User Guide > How to Work with... > Annotations > New Annotation API: ArtX > How to... > Create an Annotation > Using Function Calls

Some applications won't use the ART Toolbar, or will provide the Toolbar and other options for creating marks. In that case, a function in your application will need to create the marks directly. ART marks are created by using their objects. For example, a rectangle can be created as follows:

 
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IG_ARTX_rectangle_create(pRectangle, pFillColor, pBorder, nOpacity, &hRectMark);

Once it is created, it should be added to the ART page:

 
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IG_ARTX_page_mark_add(hArtPage, hRectMark, nCoordType, &hRectMark);

Mark properties can be edited at any time:

 
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IG_ARTX_rectangle_opacity_set(_hRectMark, 128);