KULSRUD(ID:5083/kul001)

Examples
Example 1 shows the use of description and manipulation commands to generate pictures.

The major part of the program is used to prepare a picture of three houses using a procedure HOUSE (Figure 4).

This picture is saved and a second frame with a street, tree, and sun is prepared (Figure 5).

Then the two pictures are merged (Figure 6).


Example 2 illustrates the use of analysis and validity checking. Given a previously prepared frame called SKETCH stored in the frame stack, check if the leftmost element is a vertical line. Then if the region is simply connected, solve for Laplace's equation inside the boundary. LAPLACE is the name of the library procedure used to perform this solution. Assume that the top left-hand point (XMIN, YMAX) is outside the boundary of the region (not on the leftmost element). The values of XMIN, XMAX, YMIN, YMAX, XSTEP, and YSTEP are known from the original scaling of the frame.


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