These files contain source code for handling various graphics file formats.
||This file handles windows bitmap files. It supports loading and saving
plus a few simple transformations. It also has methods to set pixel
colours and is used by all the pattern drawing applications.
Currently only 24 bit encoding is supported completely.
|These files are used for reading and writing GIF files. These is no
support for compressing or decompressing the image data.
They do let you peek inside the files and you can add remove or edit the
comment records. You can aslo alter the speed and repeat counts for
||This file enables you to convert a set of GIF files into an
animated GIF. It currently only supports series of files that all have the
same colour map and are the same size, like those that are output by some of the
examples included in the pattern code.
These files contain functions used in the patterns, but don't draw patterns
||This creates a list of files with incremental names. These are useful
for generating animations. For instance the script
MakeFileList.MakeFileList ('c:\\', 'pic', 'gif', 1, 4)
Generates the file names
||This is used to generate ranges of colours. It also defines a few. It is
used a lot in the CirclePatterns module, eg
colour_map = ColourMap.createLinear (ColourMap.green, ColourMap.blue, 4)
creates a list of four colours spread evenly between blue and green.
Colours are encoded as three character strings so the above map looks like
['\x00\xff\x00', 'U\xaa\x00', '\xaaU\x00', '\xff\x00\x00']
||This Constructs the set of pixels to draw a line between
two points. It is used by various patterns to draw straight lines.
The line following algorithm basically calculates the value of
Z = Ax + By + C
for candidate points along the line and chooses the next point to be the candidate
where Z is closest to zero. Because we start at a point on the line (where Z = 0) and
calculate the candidate values by adding the derivatives (dz/dx and dz/dy) we don't need
to know the value of C.