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Add draw arbitrary line.

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This commit is contained in:
giomba 2022-12-02 21:44:12 +01:00
parent 2baddfc76e
commit 0297598438
1 changed files with 49 additions and 4 deletions
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53
src/main.c
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@ -192,6 +192,42 @@ void draw_simple_line(uint16_t x, uint16_t y, uint16_t len, bool horizontal)
}
}
void draw_line(uint16_t _x0, uint16_t _y0, uint16_t _x1, uint16_t _y1, bool fill)
{
const float x0 = _x0;
const float y0 = _y0;
const float x1 = _x1;
const float y1 = _y1;
if (x0 != x1)
{
const uint16_t x_begin = MIN(x0, x1);
const uint16_t x_end = MAX(x0, x1);
for (uint16_t x = x_begin; x < x_end; ++x)
{
const uint16_t y = (y1 - y0) * (x - x0) / (x1 - x0) + y0;
if (fill)
set_pixel(x, y);
else
clear_pixel(x, y);
}
}
else
{
const uint16_t y_begin = MIN(y0, y1);
const uint16_t y_end = MAX(y0, y1);
for (uint16_t y = y_begin; y < y_end; ++y)
{
if (fill)
set_pixel(x0, y);
else
clear_pixel(x0, y);
}
}
}
void new_frame_handler(void)
{
if (vga_pixel_ptr && dma_ready)
@ -251,10 +287,19 @@ int main()
set_pixel(x, (x / 32) * 4 + 120);
}
// draw "E" - nice because it's not symmetrical along X
draw_simple_line(100, 100, 8, true);
draw_simple_line(100, 100, 8, false);
draw_simple_line(100, 104, 8, true);
draw_simple_line(100, 108, 8, true);
draw_line(100, 100, 108, 100, true);
draw_line(100, 100, 100, 108, true);
draw_line(100, 104, 104, 104, true);
draw_line(100, 108, 108, 108, true);
for (uint16_t x = 0; x < 480; x += 20)
{
draw_line(x, 0, 0, 480 - x, true);
draw_line(480, x, 480 - x, 480, true);
}
draw_line(200, 200, 280, 78, true);
draw_line(87, 42, 42, 87, true);
// Running programs on PIO
PIORun vga_hsync, vga_vsync, vga_pixel;