Add string measurement APIs - Githubissues

PaulStoffregen / ILI9341_t3

Optimized ILI9341 TFT Library

http://pjrc.com/store/display_ili9341.html

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Add string measurement APIs #54

Closed ImpulseAdventure closed 5 years ago

ImpulseAdventure commented 5 years ago

This PR adds the minimum necessary changes to support the reading of text string dimensions in the current font mode. These APIs are essential in order to enable other libraries to offer horizontal / vertical text justification with ILI9341_t3.

Details

Add measureTextWidth(), measureTextHeight()
Largely based on the work by @blackketter in his ILI9341_t3 fork, with additional fixes for font height metrics in setFontAdafruit() mode

Testing

Confirmed full text justification works correctly after integrating into the GUIslice GUI framework library (using both the default Adafruit-GFX font as well as the ILI9341_t3 fonts).
Confirmed existing ILI9341_t3 examples such as graphicstest & DemoSauce work correctly

Thanks