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Sub-Shapes

When you define an element or connector shape using a Shape Script, you can build the shape from separate components, defined as sub-shapes. Using sub-shapes, you can create complex shapes that more closely resemble the objects that they represent.

Sub-shape Layout

To set the layout type you use the layoutType attribute, which must be set in the initialization attributes section of the script; in other words, before any of the methods are called. Valid values for this attribute are:

  • LeftRight - Shapes with this layout position the sub-shapes side by side, with the first added on the left, and subsequent sub-shapes to the right
  • TopDown - Places the sub-shapes in a vertical arrangement, with the first sub-shape added to the top and subsequent sub-shapes added beneath
  • Border - This requires an additional argument to the addsubshape method to specify which region of the containing shape the sub-shape is to occupy: N, E, S, W or CENTER; each region can only be occupied by one sub-shape
    A sub-shape that is assigned to the E or W region must have its preferredwidth attribute specified in its declaration and, similarly, sub-shapes added to N or S must have their preferredheight attribute set; in this case, the values for these attributes are treated as static lengths and do not scale glyphs

Example

shape main

{

     layouttype="topdown";

     setfillcolor(0,0,255);

     rectangle(0,0,100,100);

     addsubshape("sub",50,100,20,0);

     addsubshape("sub",50,100,30,-100);

     addsubshape("sub",50,100,40,-200);

     addsubshape("sub",50,100,50,-300);

     shape sub

     {

          setfillcolor(0,255,0);

          ellipse(0,0,100,100);

     }

}

The script defines this shape:

A shape script example that illustrates the use of sub-shapes.
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