Bridgetek FT800, Руководство по программированию

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FT800 Series Programmer Guide
Version 2.1
Document Reference No.: BRT_000030 Clearance No.: BRT#037
27
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2.5.5 Bitmap transformation matrix
To achieve the bitmap transformation, the bitmap transform matrix below is specified in
the FT800 and denoted as
m
m =
[
𝐵𝐼𝑇𝑀𝐴𝑃_𝑇𝑅𝐴𝑁𝑆𝐹𝑂𝑅𝑀_𝐴 𝐵𝐼𝑇𝑀𝐴𝑃_𝑇𝑅𝐴𝑁𝑆𝐹𝑂𝑅𝑀_𝐵 𝐵𝐼𝑇𝑀𝐴𝑃_𝑇𝑅𝐴𝑁𝑆𝐹𝑂𝑅𝑀_𝐶
𝐵𝐼𝑇𝑀𝐴𝑃_𝑇𝑅𝐴𝑁𝑆𝐹𝑂𝑅𝑀_𝐷 𝐵𝐼𝑇𝑀𝐴𝑃_𝑇𝑅𝐴𝑁𝑆𝐹𝑂𝑅𝑀_𝐸 𝐵𝐼𝑇𝑀𝐴𝑃_𝑇𝑅𝐴𝑁𝑆𝐹𝑂𝑅𝑀_𝐹]
by default m =
[1.0 0.0 0.0
0.0 1.0 0.0
]
, it is named as identity matrix.
The coordinates
𝑥
′ ,
𝑦
′ after transforming is calculated in following equation:
[
𝑥
′
𝑦
′
1
]
= m ×
[
𝑥
𝑦
1
]
i.e.:
𝑥
′
= 𝑥 ∗ 𝐴 + 𝑦 ∗ 𝐵 + 𝐶
𝑦
′
= 𝑥 ∗ 𝐷 + 𝑦 ∗ 𝐸 + 𝐹
where A,B,C,E,D,E,F stands for the values assigned by commands
BITMAP_TRANSFORM_A-F.
2.5.6 Color and transparency
The same bitmap can be drawn in more places on the screen, in different colors and
transparency:
dl ( COLOR_RGB ( 255 , 64 , 64 )); // red at (200, 120)
dl ( VERTEX2II ( 200 , 120 , 0 , 0 ));
dl ( COLOR_RGB ( 64 , 180 , 64 )); // green at (216, 136)
dl ( VERTEX2II ( 216 , 136 , 0 , 0 ));
dl ( COLOR_RGB ( 255 , 255 , 64 )); // transparent yellow at (232, 152)
dl ( COLOR_A ( 150 ));
dl ( VERTEX2II ( 232 , 152 , 0 , 0 ));
Code snippet 10 color and transparency