ref: 87c8fa541572387c012dab672890e13334ef8c37
dir: /sys/src/libdraw/ellipse.c/
#include <u.h> #include <libc.h> #include <draw.h> static void doellipse(int cmd, Image *dst, Point *c, int xr, int yr, int thick, Image *src, Point *sp, int alpha, int phi, Drawop op) { uchar *a; _setdrawop(dst->display, op); a = bufimage(dst->display, 1+4+4+2*4+4+4+4+2*4+2*4); if(a == nil){ fprint(2, "image ellipse: %r\n"); return; } a[0] = cmd; BPLONG(a+1, dst->id); BPLONG(a+5, src->id); BPLONG(a+9, c->x); BPLONG(a+13, c->y); BPLONG(a+17, xr); BPLONG(a+21, yr); BPLONG(a+25, thick); BPLONG(a+29, sp->x); BPLONG(a+33, sp->y); BPLONG(a+37, alpha); BPLONG(a+41, phi); } void ellipse(Image *dst, Point c, int a, int b, int thick, Image *src, Point sp) { doellipse('e', dst, &c, a, b, thick, src, &sp, 0, 0, SoverD); } void ellipseop(Image *dst, Point c, int a, int b, int thick, Image *src, Point sp, Drawop op) { doellipse('e', dst, &c, a, b, thick, src, &sp, 0, 0, op); } void fillellipse(Image *dst, Point c, int a, int b, Image *src, Point sp) { doellipse('E', dst, &c, a, b, 0, src, &sp, 0, 0, SoverD); } void fillellipseop(Image *dst, Point c, int a, int b, Image *src, Point sp, Drawop op) { doellipse('E', dst, &c, a, b, 0, src, &sp, 0, 0, op); } void arc(Image *dst, Point c, int a, int b, int thick, Image *src, Point sp, int alpha, int phi) { alpha |= 1<<31; doellipse('e', dst, &c, a, b, thick, src, &sp, alpha, phi, SoverD); } void arcop(Image *dst, Point c, int a, int b, int thick, Image *src, Point sp, int alpha, int phi, Drawop op) { alpha |= 1<<31; doellipse('e', dst, &c, a, b, thick, src, &sp, alpha, phi, op); } void fillarc(Image *dst, Point c, int a, int b, Image *src, Point sp, int alpha, int phi) { alpha |= 1<<31; doellipse('E', dst, &c, a, b, 0, src, &sp, alpha, phi, SoverD); } void fillarcop(Image *dst, Point c, int a, int b, Image *src, Point sp, int alpha, int phi, Drawop op) { alpha |= 1<<31; doellipse('E', dst, &c, a, b, 0, src, &sp, alpha, phi, op); }