CIGAL Reference Manual, Chapter 2 (Commands): ZSCAN
usage: zscan source [ drawflag colorflag storeflag imin width ]
ZSCAN takes a 2-dimensional input (SOURCE) and scans across it, creating a 3-dimensional graphics image. The z coordinate of each vector in the graphics image is the value of the corresponding position in the matrix.
DRAWFLAG determines what type of vectors to draw:
0 make each vector a point 1 draw a line connecting adjacent vectors along the x-axis 2 make each point a vertical line drawn from Z=0 to the new Z value
If COLORFLAG is negative then store the matrix value as the intensity, otherwise use COLORFLAG as the intensity for all vectors (default = -1).
If STOREFLAG is 0 then just draw the vectors, don't store them. The default is to store all vectors. This can be a lot of data for a large image matrix.
Matrix values <= IMIN are not stored; IMIN defaults to 0.
WIDTH is the line width of the vectors that will be drawn (default = 1).
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