HowTo:BackgroundImg

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The coordinates are given in the range [0,1], and define the sub-window of the S2PLOT window which is used for the S2PLOT 3-d graphics. The background image covers the entire window, even if it must be stretched to do so. The coordinates are given in the range [0,1], and define the sub-window of the S2PLOT window which is used for the S2PLOT 3-d graphics. The background image covers the entire window, even if it must be stretched to do so.

Revision as of 05:25, 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 X coord of bottom left corner for S2PLOT graphics 0.2
S2PLOT_Y1 Y coord of bottom left corner for S2PLOT graphics 0.1
S2PLOT_X2 X coord of top right corner for S2PLOT graphics 0.7
S2PLOT_Y2 Y coord of top right corner for S2PLOT graphics 0.9

The coordinates are given in the range [0,1], and define the sub-window of the S2PLOT window which is used for the S2PLOT 3-d graphics. The background image covers the entire window, even if it must be stretched to do so.

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