picture - creates a picture
picture( Width, Height, Xmin = -10, Xmax = 10, Bottom = -10, Top = 10, Color = [[1,1,1]] )See also
picture creates a picture variable which is Width x Height pixels, with the background color set to Color.
Width and Height must be integers above zero.
Xmin, Xmax, Bottom & Top must bu real numbers where Xmin < Xmax & Bottom < Top.
These four variables can later be changed by set_window.
Color must be a color matrix.
Only Width and Height must be specified.
pic = picture( 400, 300, [[1,0,0]] ) creates a red picture of 400x400 pixels