Jan/WLED_MM_Infinity
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better rounding

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This commit is contained in:
Frank
2024-07-16 15:13:05 +02:00
parent e3d27de395
commit 96584c6c70
1 changed files with 8 additions and 5 deletions
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13
wled00/FX_2Dfcn.cpp
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@@ -695,12 +695,15 @@ void Segment::drawLine(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint3
// WLEDMM shorten line according to depth
if (depth < UINT8_MAX) {
if (depth == 0) return; // nothing to paint
if (depth<2) {x1 = x0; y1=y0; } // single pixel
else {
int dx1 = ((int(x1) - int(x0)) * int(depth)) / 255; // X distance, scaled down by depth
int dy1 = ((int(y1) - int(y0)) * int(depth)) / 255; // Y distance, scaled down by depth
x1 = x0 + dx1;
y1 = y0 + dy1;
else { // shorten line
x0 *=2; y0 *=2; // we do everything "*2" for better rounding
int dx1 = ((int(2*x1) - int(x0)) * int(depth)) / 255; // X distance, scaled down by depth
int dy1 = ((int(2*y1) - int(y0)) * int(depth)) / 255; // Y distance, scaled down by depth
x1 = (x0 + dx1 +1) / 2;
y1 = (y0 + dy1 +1) / 2;
x0 /=2; y0 /=2;
}
}