Advanced Programming Guide

278 • Chapter 6: Programming with Maple GraphicsThe code in the springPlot procedure uses the short names of commandsfrom the plots and plottools packages to improve readability.You must either use long names or remember to load these two packagesbefore using springPlot.> with(plots): with(plottools):> springPlot(6);> display( springPlot(6) );For information on the commands in the plottools package relatedto graphics procedures, see section 6.5.6.9 Programming with ColorYou can color each type of object in the plot data structures, and addcolors to plotting routines. The color option allows you to specify colorsin the form of a solid color, by name, by RGB or HUE values, or via acolor function in the form of a Maple formula or function. Try each of thefollowing commands.> plot3d( sin(x*y), x=-3..3, y=-3..3, color=red );> plot3d( sin(x*y), x=-3..3, y=-3..3,> color=COLOUR(RGB, 0.3, 0.42, 0.1) );> p := (x,y) -> sin(x*y):> q := (x,y) -> if x < y then 1 else x - y end if: