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Clarified texture cropping specs

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Modified Files:
 	README.xmlpanel
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j4strngs 2001-07-24 20:36:41 +00:00
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Docs/README.xmlpanel
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@ -1,5 +1,5 @@
Users Guide to FlightGear panel configuration
Version 0.7.7.1, June 23 2001
Version 0.7.7.2, July 24 2001
Author: John Check <j4strngs@rockfish.net>
This document describes the configuration of
@ -607,6 +607,39 @@ per axis
128 = 2 pixels, 0.0078125
256 = 1 pixel, 0.00390625
The displayed size of a texture in pixels is set in the instrument
configuration file. The size of the cropped area in pixels is not
directly related to the final display size.
What that table represents is:
1 / (256 / # of pixels)
Take as an example, a section 64 pixels wide on the texture file.
256/64 = 4
1/4 = 0.25
Or lets consider 1 pixel wide
256/1 = 256
1/256 = 0.00390625
If the section starts at the extreme left of the texture, the
starting number is 0.0 and the end is 0.25
If the section *doesn't* start at the edge you need to take the starting
pixel and calculate an offset. Lets say you start 2 pixels from the
edge and you are cropping a section 64 pixels wide...
256/2 = 128
1/128 = 0.0078125 <- this is the value for a 2 pixel wide offset
0.0078125 <- start at
0.25 <- add value for 64 px wide
0.2571825 <- end at
Generating Textures
-------------------
A common procedure for generating gauge faces is to use a
vector graphics package such as xfig, exporting the result as a
postscript file. 3D modeling tools may also be used and I prefer them