This subroutine generates and displays one frame of the animation using C drawcgm. The function is displayed as a color contour plot. C n the number of interior grid points in each of the x and y C directions. C dx the grid spacing. C ubig the displacements interpolated onto a finer grid.
C ibigscale the size of the finer grid, used to give smoother transitions C between colors.
C indicates whether or not the animation frame is the first one. This gives C a smoother transition between colored regions. C Generate the color image from the integer array. The image is positioned C on the display surface using drawcgm's coordinate system. The display C surface is represented by x and y coordinates ranging from 0.0 to 1.0.