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Circles and Triangles

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This commit is contained in:
Michał Gdula 2025-06-25 23:35:00 +01:00
parent 79a34396e7
commit 8d36a12a32
2 changed files with 163 additions and 5 deletions
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164
lib_sharp.c
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@ -277,11 +277,165 @@ void sharp_display_draw_filled_rectangle(sharp_display_t * display, uint16_t x,
w = min_uint16(w, display->width); w = min_uint16(w, display->width);
h = min_uint16(h, display->height); h = min_uint16(h, display->height);
for (uint16_t i = 0; i < h; i += 1) for (; y < h; y += 1)
{ {
for (uint16_t j = 0; j < w; j += 1) sharp_display_draw_line(display, x, y, x + w, y, color);
{ }
sharp_display_draw_pixel(display, x + j, y + i, color); }
}
void sharp_display_draw_circle(sharp_display_t * display, uint16_t x, uint16_t y, uint16_t r, uint16_t color)
{
int16_t f = 1 - r;
int16_t ddfx = 1;
int16_t ddfy = -2 * r;
int16_t x0 = 0;
int16_t y0 = r;
sharp_display_draw_pixel(display, x, y + r, color);
sharp_display_draw_pixel(display, x, y - r, color);
sharp_display_draw_pixel(display, x + r, y, color);
sharp_display_draw_pixel(display, x - r, y, color);
while (x0 < y0)
{
if (f >= 0)
{
y0 -= 1;
ddfy += 2;
f += ddfy;
}
x0 += 1;
ddfx += 2;
f += ddfx;
sharp_display_draw_pixel(display, x + x0, y + y0, color);
sharp_display_draw_pixel(display, x - x0, y + y0, color);
sharp_display_draw_pixel(display, x + x0, y - y0, color);
sharp_display_draw_pixel(display, x - x0, y - y0, color);
sharp_display_draw_pixel(display, x + y0, y + x0, color);
sharp_display_draw_pixel(display, x - y0, y + x0, color);
sharp_display_draw_pixel(display, x + y0, y - x0, color);
sharp_display_draw_pixel(display, x - y0, y - x0, color);
}
}
void sharp_display_draw_filled_circle(sharp_display_t * display, uint16_t x, uint16_t y, uint16_t r, uint16_t color)
{
int16_t f = 1 - r;
int16_t ddfx = 1;
int16_t ddfy = -2 * r;
int16_t x0 = 0;
int16_t y0 = r;
sharp_display_draw_line(display, x, y - r, x, y + r, color);
while (x0 < y0)
{
if (f >= 0)
{
y0 -= 1;
ddfy += 2;
f += ddfy;
}
x0 += 1;
ddfx += 2;
f += ddfx;
sharp_display_draw_line(display, x + x0, y - y0, x + x0, y + y0, color);
sharp_display_draw_line(display, x + y0, y - x0, x + y0, y + x0, color);
sharp_display_draw_line(display, x - x0, y - y0, x - x0, y + y0, color);
sharp_display_draw_line(display, x - y0, y - x0, x - y0, y + x0, color);
}
}
void sharp_display_draw_triangle(sharp_display_t * display, uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint16_t color)
{
sharp_display_draw_line(display, x0, y0, x1, y1, color);
sharp_display_draw_line(display, x1, y1, x2, y2, color);
sharp_display_draw_line(display, x2, y2, x0, y0, color);
}
void sharp_display_draw_filled_triangle(sharp_display_t * display, uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint16_t color)
{
if (y0 > y1) {
swap_int16(&y0, &y1);
swap_int16(&x0, &x1);
}
if (y1 > y2) {
swap_int16(&y2, &y1);
swap_int16(&x2, &x1);
}
if (y0 > y1) {
swap_int16(&y0, &y1);
swap_int16(&x0, &x1);
}
// Line
if (y0 == y2)
{
int16_t a = x0;
int16_t b = x0;
if (x1 < a)
{
a = x1;
} else if (x1 > b)
{
b = x1;
}
if (x2 < a)
{
a = x2;
} else if (x2 > b)
{
b = x2;
}
sharp_display_draw_line(display, a, y0, b, y0, color);
return;
}
int16_t dx01 = x1 - x0;
int16_t dy01 = y1 - y0;
int16_t dx02 = x2 - x0;
int16_t dy02 = y2 - y0;
int16_t dx12 = x2 - x1;
int16_t dy12 = y2 - y1;
int16_t sa = 0;
int16_t sb = 0;
int16_t a = 0;
int16_t b = 0;
int16_t last = y1 - 1;
if (y1 == y2)
{
last = y1;
}
int16_t y = y0;
for (; y <= last; y += 1) {
a = x0 + sa / dy01;
b = x0 + sb / dy02;
sa += dx01;
sb += dx02;
sharp_display_draw_line(display, a, y, b, y, color);
}
sa = dx12 * (y - y1);
sb = dx02 * (y - y0);
for (; y <= y2; y += 1) {
a = x1 + sa / dy12;
b = x0 + sb / dy02;
sa += dx12;
sb += dx02;
sharp_display_draw_line(display, a, y, b, y, color);
} }
} }

4
lib_sharp.h
View file

@ -40,5 +40,9 @@ void sharp_display_draw_pixel(sharp_display_t * display, uint16_t x, uint16_t y,
void sharp_display_draw_line(sharp_display_t * display, int16_t x0, int16_t y0, int16_t x1, int16_t y1, uint16_t color); void sharp_display_draw_line(sharp_display_t * display, int16_t x0, int16_t y0, int16_t x1, int16_t y1, uint16_t color);
void sharp_display_draw_rectangle(sharp_display_t * display, uint16_t x, uint16_t y, uint16_t w, uint16_t h, uint16_t color); void sharp_display_draw_rectangle(sharp_display_t * display, uint16_t x, uint16_t y, uint16_t w, uint16_t h, uint16_t color);
void sharp_display_draw_filled_rectangle(sharp_display_t * display, uint16_t x, uint16_t y, uint16_t w, uint16_t h, uint16_t color); void sharp_display_draw_filled_rectangle(sharp_display_t * display, uint16_t x, uint16_t y, uint16_t w, uint16_t h, uint16_t color);
void sharp_display_draw_circle(sharp_display_t * display, uint16_t x, uint16_t y, uint16_t r, uint16_t color);
void sharp_display_draw_filled_circle(sharp_display_t * display, uint16_t x, uint16_t y, uint16_t r, uint16_t color);
void sharp_display_draw_triangle(sharp_display_t * display, uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint16_t color);
void sharp_display_draw_filled_triangle(sharp_display_t * display, uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint16_t color);
#endif #endif