draw-text

C++ implementation

#pragma XOD evaluate_on_pin disable
#pragma XOD evaluate_on_pin enable input_UPD

node {
    static void printAt(rgb_lcd* lcd, uint8_t rowIndex, uint8_t posIndex, XString str) {
        lcd->setCursor(posIndex, rowIndex);
        uint8_t whitespace = 16;
        for (auto it = str.iterate(); it && whitespace > 0; ++it, --whitespace)
            lcd->print(*it);
    }
    
    void evaluate(Context ctx) {
        // The node responds only if there is an input pulse
        if (!isInputDirty<input_UPD>(ctx))
            return;

        auto t = getValue<input_DEV>(ctx);

        auto str = getValue<input_TXT>(ctx);
        uint8_t row = (uint8_t) getValue<input_ROW>(ctx);
        uint8_t pos = (uint8_t) getValue<input_COL>(ctx);

        if (row < 0 || row >= t.rows || pos < 0 || pos >= t.cols) {
            raiseError<output_DONE>(ctx);
            return;
        }
        
        printAt(t.lcd, row, pos, str);

        emitValue<output_DONE>(ctx, 1);
        emitValue<output_DEV_>(ctx, t);
    }
}