ref: 99cc56f2e986f7337142d382d699ef09c337074a
dir: /sys/src/libdraw/line.c/
#include <u.h> #include <libc.h> #include <draw.h> void line(Image *dst, Point p0, Point p1, int end0, int end1, int radius, Image *src, Point sp) { lineop(dst, p0, p1, end0, end1, radius, src, sp, SoverD); } void lineop(Image *dst, Point p0, Point p1, int end0, int end1, int radius, Image *src, Point sp, Drawop op) { uchar *a; _setdrawop(dst->display, op); a = bufimage(dst->display, 1+4+2*4+2*4+4+4+4+4+2*4); if(a == nil){ fprint(2, "image line: %r\n"); return; } a[0] = 'L'; BPLONG(a+1, dst->id); BPLONG(a+5, p0.x); BPLONG(a+9, p0.y); BPLONG(a+13, p1.x); BPLONG(a+17, p1.y); BPLONG(a+21, end0); BPLONG(a+25, end1); BPLONG(a+29, radius); BPLONG(a+33, src->id); BPLONG(a+37, sp.x); BPLONG(a+41, sp.y); }