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better handling of perspective

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drawLine parameter "depth" shortens a line by a fraction - useful for VP perspective (vanishing point)
This commit is contained in:
Frank
2024-07-16 13:27:56 +02:00
parent 6565e716ab
commit e3d27de395
3 changed files with 22 additions and 12 deletions
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15
wled00/FX_2Dfcn.cpp
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@@ -676,7 +676,7 @@ void Segment::nscale8(uint8_t scale) { //WLEDMM: use fast types
}
//line function
void Segment::drawLine(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint32_t c, bool soft, uint16_t distance) {
void Segment::drawLine(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint32_t c, bool soft, uint8_t depth) {
if (!isActive()) return; // not active
// if (Segment::maxHeight==1) return; // not a matrix set-up
const int cols = virtualWidth();
@@ -693,6 +693,17 @@ void Segment::drawLine(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint3
if (_bri_t < 255) scaled_col = color_fade(c, _bri_t);
}
// WLEDMM shorten line according to depth
if (depth < UINT8_MAX) {
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;
}
}
const int dx = abs(x1-x0), sx = x0<x1 ? 1 : -1; // x distance & step
const int dy = abs(y1-y0), sy = y0<y1 ? 1 : -1; // y distance & step
@@ -732,7 +743,7 @@ void Segment::drawLine(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint3
} else {
// Bresenham's algorithm
int err = (dx>dy ? dx : -dy)/2; // error direction
for (uint_fast16_t d=0; d<distance; d++) {
for (;;) {
// if (x0 >= cols || y0 >= rows) break; // WLEDMM we hit the edge - should never happen
if (simpleSegment) setPixelColorXY_fast(x0, y0, c, scaled_col, cols, rows);
else setPixelColorXY(x0, y0, c);