HowTo:BackgroundImg

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Revision as of 04:43, 19 February 2008

It is simple to run an existing S2PLOT program over the top of a background image. This behaviour is completely controlled by runtime environment variables, so no modification to program code is required.

You will need a background image in TGA format. You can use the ImageMagick "convert" utility to write a TGA file from almost any bitmap format file.

Prior to running your S2PLOT program, simply set the following environment variables:

variable meaning sample value
S2PLOT_BGIMG filename of background TGA image "universe.tga"
S2PLOT_X1 window-fractional X coordinate (in range 0,1) of bottom left corner for S2PLOT animation 0.2
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