PT Draw

PT draw is a drawing library for the pine time for drawing very simple line art, including icons and fonts which are scalable to any size.

This project has several goals:

• Be small in RAM
• Be fast to run
• Be usable on low-end hardware
• Create simple, clean scalable graphics

Example

The following is an example for drawing the letter "s" in 8 bytes (curves are set to 8 segments).

UINT8 l[8] = {SEQ_CURV | ((3 - 1) << 4), 0xD2, 0x00, 0x26, 0x77, 0xD8, 0xFF, 0x2D};
pt_draw_create_bitmap(l, 8, buff, 256);

Output result:

In the following image you can see how the above HEX values influence the shape of the curve.

Key:

• Blue - HEX values from the description sequence
• Red - Order of the bytes in the sequence (and order the shape is drawn)
• Green - Direct line to outer points
• Magenta - The pull from the "curve" point

Documentation

The following is documentation on the project:

• Algorithms
• API
• File format

TODO

• Basic icon set
• 7 bit ASCI font definition
• Test coverage (prevent code regression)
• Fuzzing for sequence input (no valid or invalid sequence should crash)
• Shape fill (for simple shapes, trying to keep efficient)