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implement alternate drawline

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This commit is contained in:
cho45 2019-08-26 15:21:57 +09:00
parent f2ab569e5a
commit 3883e9cfa1
1 changed files with 78 additions and 0 deletions
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78
plot.c
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@ -805,6 +805,7 @@ void plot_into_index(float measured[2][101][2])
markmap_all_markers();
}
#if 0
void
cell_drawline(int w, int h, int x0, int y0, int x1, int y1, int c)
{
@ -857,6 +858,83 @@ cell_drawline(int w, int h, int x0, int y0, int x1, int y1, int c)
}
}
}
#else
const uint8_t INSIDE = 0b0000;
const uint8_t LEFT = 0b0001;
const uint8_t RIGHT = 0b0010;
const uint8_t BOTTOM = 0b0100;
const uint8_t TOP = 0b1000;
inline static uint8_t
_compute_outcode(int w, int h, int x, int y)
{
uint8_t code = 0;
if (x < 0) {
code |= LEFT;
} else
if (x > w) {
code |= RIGHT;
}
if (y < 0) {
code |= BOTTOM;
} else
if (y > h) {
code |= TOP;
}
return code;
}
void
cell_drawline(int w, int h, int x0, int y0, int x1, int y1, int c)
{
uint8_t outcode0 = _compute_outcode(w, h, x0, y0);
uint8_t outcode1 = _compute_outcode(w, h, x1, y1);
if (outcode0 & outcode1) {
// this line is out of requested area. early return
return;
}
if (x0 > x1) {
SWAP(x0, x1);
SWAP(y0, y1);
}
int dx = x1 - x0;
int dy = y1 - y0;
int sy = dy > 0 ? 1 : -1;
int e = 0;
dy *= sy;
if (dx >= dy) {
e = dy * 2 - dx;
while (x0 != x1) {
if (y0 >= 0 && y0 < h && x0 >= 0 && x0 < w) spi_buffer[y0*w+x0] |= c;
x0++;
e += dy * 2;
if (e >= 0) {
e -= dx * 2;
y0 += sy;
}
}
if (y0 >= 0 && y0 < h && x0 >= 0 && x0 < w) spi_buffer[y0*w+x0] |= c;
} else {
e = dx * 2 - dy;
while (y0 != y1) {
if (y0 >= 0 && y0 < h && x0 >= 0 && x0 < w) spi_buffer[y0*w+x0] |= c;
y0 += sy;
e += dx * 2;
if (e >= 0) {
e -= dy * 2;
x0++;
}
}
if (y0 >= 0 && y0 < h && x0 >= 0 && x0 < w) spi_buffer[y0*w+x0] |= c;
}
}
#endif
int
search_index_range(int x, int y, uint32_t index[101], int *i0, int *i1)