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2D Lissajous improvements

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* allow user to control rotation speed (c3 slider)
* preserve accuracy by performing division _after_ multiplication: " (i * speed) / 32", instead of " i * (speed / 32)"
* proper rounding of "map" results, for better visual appearance
* avoid division by zero in map() function
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Frank 2023-06-14 20:21:43 +02:00 committed by GitHub
parent dd9da2853a
commit 9e69627626
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1 changed files with 7 additions and 6 deletions
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wled00/FX.cpp
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@ -5095,21 +5095,22 @@ uint16_t mode_2DLissajous(void) { // By: Andrew Tuline
const uint16_t rows = SEGMENT.virtualHeight();
SEGMENT.fadeToBlackBy(SEGMENT.intensity);
uint_fast16_t phase = (millis() * (1 + SEGENV.custom3)) /32; // allow user to control rotation speed
//for (int i=0; i < 4*(cols+rows); i ++) {
for (int i=0; i < 256; i ++) {
//float xlocn = float(sin8(now/4+i*(SEGMENT.speed>>5))) / 255.0f;
//float ylocn = float(cos8(now/4+i*2)) / 255.0f;
uint8_t xlocn = sin8(millis()/4+i*(SEGMENT.speed>>5));
uint8_t ylocn = cos8(millis()/4+i*2);
xlocn = map(xlocn,0,255,0,cols-1);
ylocn = map(ylocn,0,255,0,rows-1);
SEGMENT.setPixelColorXY(xlocn, ylocn, SEGMENT.color_from_palette(millis()/100+i, false, PALETTE_SOLID_WRAP, 0));
uint_fast8_t xlocn = sin8(phase/2 + (i*SEGMENT.speed)/32);
uint_fast8_t ylocn = cos8(phase/2 + i*2);
xlocn = (cols < 2) ? 1 : (map(2*xlocn, 0,511, 0,2*(cols-1)) +1) /2; // softhack007: "*2 +1" for proper rounding
ylocn = (rows < 2) ? 1 : (map(2*ylocn, 0,511, 0,2*(rows-1)) +1) /2; // "rows > 2" is needed to avoid div/0 in map()
SEGMENT.setPixelColorXY((uint8_t)xlocn, (uint8_t)ylocn, SEGMENT.color_from_palette(millis()/100+i, false, PALETTE_SOLID_WRAP, 0));
}
return FRAMETIME;
} // mode_2DLissajous()
static const char _data_FX_MODE_2DLISSAJOUS[] PROGMEM = "Lissajous@X frequency,Fade rate;!;!;2";
static const char _data_FX_MODE_2DLISSAJOUS[] PROGMEM = "Lissajous@X frequency,Fade rate,,,Speed;!;!;2;;c3=15";
///////////////////////