mirror of
https://github.com/isometimes/rpi4-osdev
synced 2024-11-24 11:10:40 +00:00
110 lines
2.3 KiB
C
110 lines
2.3 KiB
C
#include "../include/wgt.h"
|
|
|
|
void wellipse (short x_center, short y_center, short x_radius, short y_radius)
|
|
{
|
|
short x, y;
|
|
long aa, aa2, bb, bb2, d, dx, dy;
|
|
|
|
x = 0;
|
|
y = y_radius;
|
|
aa = (int)x_radius * (int)x_radius;
|
|
aa2 = 2 * aa;
|
|
bb = (int)y_radius * (int)y_radius;
|
|
bb2 = 2 * bb;
|
|
|
|
d = bb - aa * (int)y_radius + aa / 4;
|
|
dx = 0;
|
|
dy = aa2 * (int)y_radius;
|
|
|
|
wputpixel (x_center, y_center - y);
|
|
wputpixel (x_center, y_center + y);
|
|
wputpixel (x_center - x_radius, y_center);
|
|
wputpixel (x_center + x_radius, y_center);
|
|
|
|
while (dx < dy)
|
|
{
|
|
if (d > 0)
|
|
{
|
|
y--;
|
|
dy -= aa2;
|
|
d -= dy;
|
|
}
|
|
x++;
|
|
dx += bb2;
|
|
d += bb + dx;
|
|
|
|
wputpixel (x_center + x, y_center + y);
|
|
wputpixel (x_center - x, y_center + y);
|
|
wputpixel (x_center + x, y_center - y);
|
|
wputpixel (x_center - x, y_center - y);
|
|
}
|
|
|
|
d += (3 * (aa - bb) / 2 - (dx + dy)) / 2;
|
|
while (y > 0)
|
|
{
|
|
if (d < 0)
|
|
{
|
|
x++;
|
|
dx += bb2;
|
|
d += bb + dx;
|
|
}
|
|
|
|
y--; dy -= aa2; d += aa - dy;
|
|
wputpixel (x_center + x, y_center + y);
|
|
wputpixel (x_center - x, y_center + y);
|
|
wputpixel (x_center + x, y_center - y);
|
|
wputpixel (x_center - x, y_center - y);
|
|
}
|
|
}
|
|
|
|
void wfill_ellipse (short x_center, short y_center, short x_radius, short y_radius)
|
|
{
|
|
short x, y;
|
|
long aa, aa2, bb, bb2, d, dx, dy;
|
|
|
|
x = 0;
|
|
y = y_radius;
|
|
aa = (int)x_radius * (int)x_radius;
|
|
aa2 = 2 * aa;
|
|
bb = (int)y_radius * (int)y_radius;
|
|
bb2 = 2 * bb;
|
|
d = bb - aa * (int)y_radius + aa / 4;
|
|
dx = 0;
|
|
dy = aa2 * (int)y_radius;
|
|
|
|
while (dx < dy)
|
|
{
|
|
if (d > 0)
|
|
{
|
|
wline (x_center + x, y_center + y, x_center - x, y_center + y);
|
|
wline (x_center + x, y_center - y, x_center - x, y_center - y);
|
|
y--;
|
|
dy -= aa2;
|
|
d -= dy;
|
|
}
|
|
x++;
|
|
dx += bb2;
|
|
d += bb + dx;
|
|
|
|
}
|
|
wline (x_center + x, y_center + y, x_center - x, y_center + y);
|
|
wline (x_center + x, y_center - y, x_center - x, y_center - y);
|
|
|
|
d += (3 * (aa - bb) / 2 - (dx + dy)) / 2;
|
|
while (y > 0)
|
|
{
|
|
if (d < 0)
|
|
{
|
|
x++;
|
|
dx += bb2;
|
|
d += bb + dx;
|
|
}
|
|
|
|
y--;
|
|
dy -= aa2;
|
|
d += aa - dy;
|
|
|
|
wline (x_center + x, y_center + y, x_center - x, y_center + y);
|
|
wline (x_center + x, y_center - y, x_center - x, y_center - y);
|
|
}
|
|
}
|