Bridgetek FT801 - Drawing pattern

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FT800 Series Programmer Guide

Version 2.1

Document Reference No.: BRT_000030 Clearance No.: BRT#037

Product Page

2.5.3 Drawing pattern

The general pattern for drawing is:

 BEGIN with one of the primitive types

 Input one or more vertices, which specify the placement of the primitive on

the screen

 END to mark the end of the primitive

(note: In many examples the END command is not explicitly listed)

The primitive types that the graphics engine support are:

 BITMAPS - rectangular pixel arrays, in various color formats

 POINTS - anti-aliased points, point radius is 1-256 pixels

 LINES - anti-aliased lines, with width from 0 to 4095 1/16th of pixel units.

(width is from center of the line to boundary)

 LINE_STRIP - anti-aliased lines, connected head-to-tail

 RECTS - round-cornered rectangles, curvature of the corners can be adjusted

using LINE_WIDTH.

 EDGE_STRIP_A/B/L/R - edge strips

Examples

Draw points with varying radius from 5 pixels to 13 pixels with different colors:

dl( COLOR_RGB(128, 0, 0) );

dl( POINT_SIZE(5 * 16) );

dl( BEGIN(POINTS) );

dl( VERTEX2F(30 * 16,17 * 16) );

dl( COLOR_RGB(0, 128, 0) );

dl( POINT_SIZE(8 * 16) );

dl( VERTEX2F(90 * 16, 17 * 16) );

dl( COLOR_RGB(0, 0, 128) );

dl( POINT_SIZE(10 * 16) );

dl( VERTEX2F(30 * 16, 51 * 16) );

dl( COLOR_RGB(128, 128, 0) );

dl( POINT_SIZE(13 * 16) );

dl( VERTEX2F(90 * 16, 51 * 16) );