pixie_utility.h

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#ifndef pixie_utility_h
#define pixie_utility_h
 
// Extra utilities for PixieChroma code, such as the gamma LUT
 
#if defined(ARDUINO_ARCH_ESP32)
    #define ANALOG_PIN 35
#endif
 
void (*anim_func)(PixieChroma* _p, float delta);
 
const int8_t xy_template[77] PROGMEM = {  
    -2, -2, -2, -2, -2, -2, -2,
    -2, -2, -2, -2, -2, -2, -2,
    -2, -1, -1, -1, -1, -1, -2,  
    -2, -1, -1, -1, -1, -1, -2,  
    -2, -1, -1, -1, -1, -1, -2,  
    -2, -1, -1, -1, -1, -1, -2,  
    -2, -1, -1, -1, -1, -1, -2,  
    -2, -1, -1, -1, -1, -1, -2,  
    -2, -1, -1, -1, -1, -1, -2,
    -2, -2, -2, -2, -2, -2, -2,
    -2, -2, -2, -2, -2, -2, -2
};
 
const uint8_t gamma8[] = {
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  1,  1,  1,
    1,  1,  1,  1,  1,  1,  1,  1,  1,  2,  2,  2,  2,  2,  2,  2,
    2,  3,  3,  3,  3,  3,  3,  3,  4,  4,  4,  4,  4,  5,  5,  5,
    5,  6,  6,  6,  6,  7,  7,  7,  7,  8,  8,  8,  9,  9,  9,  10,
    10, 10, 11, 11, 11, 12, 12, 13, 13, 13, 14, 14, 15, 15, 16, 16,
    17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 24, 24, 25,
    25, 26, 27, 27, 28, 29, 29, 30, 31, 32, 32, 33, 34, 35, 35, 36,
    37, 38, 39, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 50,
    51, 52, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68,
    69, 70, 72, 73, 74, 75, 77, 78, 79, 81, 82, 83, 85, 86, 87, 89,
    90, 92, 93, 95, 96, 98, 99, 101,102,104,105,107,109,110,112,114,
    115,117,119,120,122,124,126,127,129,131,133,135,137,138,140,142,
    144,146,148,150,152,154,156,158,160,162,164,167,169,171,173,175,
    177,180,182,184,186,189,191,193,196,198,200,203,205,208,210,213,
    215,218,220,223,225,228,231,233,236,239,241,244,247,249,252,255
};
 
char* dtoa(double input, char* buffer, int precision) {
    int32_t whole_part = (int32_t) input;
 
    // Deposit the whole part of the number.
    itoa( whole_part, buffer, 10 );
 
    // Now work on the faction if we need one.
    if( precision > 0 ) {
 
        // We do, so locate the end of the string and insert
        // a decimal point.
        char* end_of_string = buffer;
        while( *end_of_string != '\0' ){
            end_of_string++;
        }
        *end_of_string++ = '.'; 
 
        // Now work on the fraction, being sure to turn any negative
        // values positive.
        if (input < 0) {
            input *= -1;
            whole_part *= -1;
        }
        
        double fraction = input - whole_part;
        while (precision > 0) {
            // Multiply by ten and pull out the digit.
            fraction *= 10;
            whole_part = (int32_t) fraction;
            *end_of_string++ = '0' + whole_part;
 
            // Update the fraction and move on to the
            // next digit.
            fraction -= whole_part;
            precision--;
        }
 
        // Terminate the string.
        *end_of_string = '\0';
    }
    
    return buffer;
}
 
#endif