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Can see an example in our cmas2d_customlib example problemtype.

<gid>/problemtypes/Examples/examplescustomlib/cmas2dcondition_customlibsymbols.gid

The condition named Pointpoint_Weight weightdeclares inside the <condition> xml node a <symbol> Tcl proc, to draw the condition as a simple raster image file.

  <condition n="Pointpoint_Weightweight" pn="Point Weight" ov="point" ovm="node" icon="darkorange-weight-18" groups_icon="yelowish-group" help="Concentrated mass">
    <value n="Weight" pn="Weight" v="0.0" unit_magnitude="M" units="kg" help="Specify the weight that you want to apply"/>  
    <symbol proc="gid_groups_conds::draw_symbol_image weight-18.png" orientation="global"/>
    <!-- or a more customized example implementing our own procecedure <symbol proc='Cmas2d::DrawSymbolWeigth' orientation='global'/>
-->
  </condition>

The gid_groups_conds::draw_symbol_image predefined library proc require the image file name (common image formats are allowed)

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In this simple case the picture doesn’t use any value of the condition, all conditions of this name will be represented with the same bitmap.

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