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#include "Vlib.h"
#define TICKtoRAD(a) (a * M_PI / (180.0 * 64.0))
#define INCR (30 * 64)
void
VDrawArc(Viewport * v, int x, int y, int width, int height, int angle1, int angle2, Color color)
{
register ZInfo *z;
register double w, h, xc, yc;
register int incr, x1, x2, y1, y2;
if (v->ztop == v->zsize) {
fprintf(stderr, "Z-information pool overflow\n");
return;
}
z = &(v->zpool[(v->ztop)++]);
z->depth = --v->depth;
z->color = color;
w = width / 2.0;
h = height / 2.0;
xc = x + width / 2.0;
yc = y + height / 2.0;
if (angle2 < 0) {
incr = -INCR;
angle2 = -angle2;
}
else
incr = INCR;
if (angle2 > 360 * 64)
angle2 = 360 * 64;
x1 = (int) (xc + (w * cos(TICKtoRAD(angle1))));
y1 = (int) (yc - (h * sin(TICKtoRAD(angle1))));
while (angle2 != 0) {
angle1 += incr;
angle2 -= INCR;
if (angle2 < 0) {
angle1 -= angle2;
angle2 = 0;
}
x2 = (int) (xc + (w * cos(TICKtoRAD(angle1))));
y2 = (int) (yc - (h * sin(TICKtoRAD(angle1))));
v->DrawLine(v, x1, y1, x2, y2, z->color);
x1 = x2;
y1 = y2;
}
}
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