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Added a quick lookup table for texture dimensions.

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curt 2001-03-06 19:35:56 +00:00
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docs-mini/README.xmlpanel
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Users Guide to FlightGear panel configuration
Version 0.5, November 8 2000
Version 0.6, March 1 2001
Author: John Check <j4strngs@rockfish.net>
This document is an attempt to describe the configuration of
@ -124,10 +124,33 @@ applied *before* the transformation that describes the needle movement.
About Textures:
The texture files used to create the panel instruments are maximum 256x256
pixels, red/green/blue/alpha format. When calling a section of a texture file
the 0,0 lower left convention is used. There is a pair of x /y coordinates
defining which section of the texture to use.
pixels, red/green/blue/alpha format. However the mechanism for specifying
texture cropping coordinates is decimal in nature. When calling a section
of a texture file the 0,0 lower left convention is used.
There is a pair of x/y coordinates defining which section of the texture
to use.
The following table can be used to calculate texture cropping specifications.
# of divisions | width in pixels | decimal specification
per axis
1 = 256 pixels 1
2 = 128 pixels, 0.5
4 = 64 pixels, 0.25
8 = 32 pixels, 0.125
16 = 16 pixels, 0.0625
32 = 8 pixels, 0.03125
64 = 4 pixels, 0.015625
128 = 2 pixels, 0.0078125
The recommended procedure for generating gauge faces is to use a
vector graphics package such as xfig, exporting the result as a
poscript file. 3D modeling tools may also be used and are prefered
for pretty items that don't require text such as levers, switches,
bezels and so forth. Ideally, the size of the item in the final render
should be of proportions that fit into the recommended pixel widths.
The resulting files should be imported into a graphics manipulation
package such as GIMP, et al for final processing.
* If there are *any* XML parsing errors, the panel will fail to load,
@ -140,4 +163,3 @@ defining which section of the texture to use.
there may also be built-in layers for special things like a
weather-radar display or a GPS (though the GPS could be handled with
text properties).