I meet a problem
on rendering a vpath which has crossing segments and
the crossing point seperates the region into
two parts, the coding is something like
this:
ArtVpath vp[] =
{
{ART_MOVETO, 100, 100},
{ART_LINETO, 100,
0},
{ART_LINETO, 0, 0},
{ART_LINETO, 0,
100},
{ART_LINETO, 200, 100},
{ART_LINETO, 200,
200},
{ART_LINETO, 100, 200},
{ART_LINETO, 100,
100},
{ART_END, 0, 0}
};
ArtSVP* s, * svp =
art_svp_from_vpath(vp);
if(svp){
s =
art_svp_uncross(svp);
art_svp_free(svp);
svp
= art_svp_rewind_uncrossed (s,
ART_WIND_RULE_NONZERO);
art_svp_free(s);
}
if(svp){
art_u8* buffer = art_new (art_u8,
WIDTH*HEIGHT*BYTES_PER_PIXEL);
if(buffer){
art_u32 color = (0xFF
<< 24) | (0x00 <<16) | (0x00<<8) | (0xAA);
art_rgb_fill_run(buffer,
0xFF, 0xFF, 0xFF, WIDTH * HEIGHT);
art_rgb_svp_alpha(svp,
0, 0, WIDTH, HEIGHT, color, buffer, WIDTH * BYTES_PER_PIXEL,
NULL);
...
}
}
appreciate if u can offer solution to
handle this problem early.
Any comments will be greatly
helpful!!
ultrasony
20/11/2002
