Hopefully, this applet is fairly intuitive. Basically, you select the drawing algorithm from the drop-down list, enter the parameters in the grid below and click the redraw button.

Note: The applet will continue to use the same parameters until you do click the redraw button. You must also click the check box to the left of each row in the grid that has a valid set of values. The values in the grid are the a..f transform co-efficients as described earlier.