4. Drawing an icon on the M5Paper from an array

Drawing an icon on the M5Paper from an array

  • S

    On the M5Paper how can I draw an icon using a function with drawPixel() from an array of the form;

    static const uint8_t SUNRISE64x64[8192] = {
    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff........};

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  • M

    There is an M5Paper weather display that uses that very code. Maybe looking at it will help you figure it out. I am just getting started coding, but I compiled that weather project yesterday and remember seeing that code.

    https://github.com/Bastelschlumpf/M5PaperWeather/blob/master/weather/Icons.h

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  • S

    Yes indeed, that's the very code I'm using at the moment. The problem is the people over at the Arduino Forum insist that the code is "not allowed" and bad C/C++ coding because the icon arrays are uint8_t and the DrawIcon function uses uint16_t. Here is a link to the discussions this issue appears towards the end of the discussion from post 20/38. Also it is very difficult for me to understand eactly how the DrawIcon function works, even though it most certainly does work. I have tried changing the uint16_t references in the function to uint8_t and the arrays to uint16_t but all I get with both changes is a black square instead of an icon.

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  • Hello @Steve1

    I had success with the following converter settings.

    0_1704017737289_IconConvert1_20231231.png

    0_1704017750382_IconConvert2_20231231.png

    This creates a array size of 8192 - same as the stock icons and displays correctly using the DrawIcon() function from the Weather app.

    // array size is 8192
static const uint16_t IconCloud64x64[]  = {
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000,

    Note: I had best results converting jpg using above converter. (png did not work for me and always created an all zero array.)

    Thanks
    Felix

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