void
arc(Bitmap *b, Point p0, Point p1, Point p2, int v, Fcode f)
{
unsigned int d;
int x, y, r, start, end, delta;
GC g;
p1.x -= p0.x;
p1.y -= p0.y;
p2.x -= p0.x;
p2.y -= p0.y;
r = (int)sqrt((double)(p1.x*p1.x + p1.y*p1.y));
start = (int)(64*rad2deg(atan2(-p2.y, p2.x)));
end = (int)(64*rad2deg(atan2(-p1.y, p1.x)));
if(start < 0)
start += 64*360;
if(end < 0)
end += 64*360;
delta = end - start;
if(delta < 0)
delta += 64*360;
x = p0.x - r;
y = p0.y - r;
if(b->flag&SHIFT){
x -= b->r.min.x;
y -= b->r.min.y;
}
d = 2*r;
g = _getfillgc(f, b, v);
/*
* delta is positive, so this draws counterclockwise arc
* from start to start+delta
*/
XDrawArc(_dpy, (Drawable)b->id, g, x, y, d, d, start, delta);
}
void
disc(Bitmap *b, Point p, int r, int v, Fcode f)
{
unsigned int d;
int x, y;
GC g;
x = p.x - r;
y = p.y - r;
if (b->flag&SHIFT){
x -= b->r.min.x;
y -= b->r.min.y;
}
d = 2*r;
g = _getfillgc(f, b, v);
XFillArc(_dpy, (Drawable)b->id, g, x, y, d, d, 0, 23040/* 360 deg */);
}
void
wrbitmap(Bitmap *b, int miny, int maxy, unsigned char *data)
{
XImage *im;
int w, h, inld, outld, l, offset, px;
GC g;
char *tdata;
w = Dx(b->r);
h = maxy - miny;
inld = b->ldepth;
outld = (b->ldepth == 0) ? 0 : screen.ldepth;
px = 1<<(3-outld); /* pixels per byte */
/* set l to number of bytes of data per scan line */
if(b->r.min.x >= 0)
offset = b->r.min.x % px;
else
offset = px - b->r.min.x % px;
l = (-b->r.min.x+px-1)/px;
if(b->r.max.x >= 0)
l += (b->r.max.x+px-1)/px;
else
l -= b->r.max.x/px;
l *= h;
tdata = (char *)malloc(l);
if (tdata == (char *) 0)
berror("wrbitmap malloc");
if (inld == outld)
memcpy((void*)tdata, (void*)data, l);
else
_ldconvert((char*)data, inld, tdata, outld, w, h);
im = XCreateImage(_dpy, 0, 1 << outld, ZPixmap, 0, tdata, w, h, 8, 0);
/* Botched interface to XCreateImage doesn't let you set these: */
im->bitmap_bit_order = MSBFirst;
im->byte_order = MSBFirst;
g = _getfillgc(S, b, ~0);
XSetBackground(_dpy, g, b->flag&DP1 ? 0 : _bgpixel);
XPutImage(_dpy, (Drawable)b->id, g, im, offset, 0, 0, miny - b->r.min.y, w-offset, h);
XDestroyImage(im);
}
void
segment(Bitmap *d, Point p1, Point p2, int v, Fcode f)
{
int x1, y1, x2, y2;
GC g;
x1 = p1.x;
y1 = p1.y;
x2 = p2.x;
y2 = p2.y;
if(d->flag&SHIFT){
x1 -= d->r.min.x;
y1 -= d->r.min.y;
x2 -= d->r.min.x;
y2 -= d->r.min.y;
}
g = _getfillgc(f, d, v);
XDrawLine(_dpy, (Drawable)d->id, g, x1, y1, x2, y2);
}
