ILI943x and GFXfont usage

[probso]

Please can you provide some simple documentation on the expected/normal parameters of these functions:
void drawChar(uint16_t x, uint16_t y, char c, uint16_t colour, GFXfont *font);
void charBounds(char c, int16_t *x, int16_t *y, int16_t *minx, int16_t *miny, int16_t *maxx, int16_t *maxy, GFXfont *font);
void textBounds(const char *str, int16_t x, int16_t y, int16_t *x1, int16_t *y1, uint16_t *w, uint16_t *h, GFXfont *font);

Specifically,

• what is passed for the GFXfont variable to access the font library?
• how are charBounds and textBounds used?
• Is it possible to pass a string to textBounds rather than single charecters?

Many thanks

[Fbeen]

Getting it to work was quite a challenge. First, I created a new C++(!) project in VScode and cloned the repository into this new project directory. Then, I modified CmakeLists.txt to the following at the bottom:

# ==========================================================================================
add_subdirectory(pico-libs/src/common/fonts)
add_subdirectory(pico-libs/src/common/ili934x)

# Add the standard library to the build
target_link_libraries(test4
    pico_stdlib
    fonts
    ili934x
)

# Add the standard include files to the build
target_include_directories(test4 PRIVATE
    pico-libs/src/common/fonts
    pico-libs/src/common/ili934x
    ${CMAKE_CURRENT_LIST_DIR}
)

pico_add_extra_outputs(test4)
# =================================================================================================

Ninja then complained during compilation that there was no build.ninja file. Using ChatGPT, I was able to fix it with the following commands, where test4 was the project directory:

cd ~/pico/test4
rm -rf build
mkdir build
cd build
cmake -G Ninja ..

Finally, there was an error message that the sleep_us() function wasn't declared, and I had to add

#include "pico/stdlib.h"

to the ili934x.h include file!