camera.gif (2038 bytes)This page contains demonstration programs contributed by various people who uses the QOCA toolkit.



Author: Richard Kuang-Hsu Lin

This applet utilizes the Cassowary solver.  It demonstrates the use of both equality and inequality constraints.  To see it work, try dragging any of the line on the diagram.

The constraints involved require that all the lines are within the boundary of the applet, and each end-point of a line is attached to end-point of another line within the same quadrilateral.  The corners of the inner quadrilateral are constrained to the mid-points of the outer quadrilateral.