/**
* art_svp_intersect: Compute the intersection of two sorted vector paths.
* @svp1: One sorted vector path.
* @svp2: The other sorted vector path.
*
* Computes the intersection of the two argument svp's. Given two
* svp's with winding numbers of 0 and 1 everywhere, the resulting
* winding number will be 1 where both of the argument svp's has a
* winding number 1, 0 otherwise. The result is newly allocated.
*
* Currently, this routine has accuracy problems pending the
* implementation of the new intersector.
*
* Return value: The intersection of @svp1 and @svp2.
**/
ArtSVP *
art_svp_intersect (const ArtSVP *svp1, const ArtSVP *svp2)
{
#ifdef ART_USE_NEW_INTERSECTOR
ArtSVP *svp3, *svp_new;
ArtSvpWriter *swr;
#ifdef ROBIN_DEBUG
dump_svp("art_svp_intersect svp1", svp1);
dump_svp("art_svp_intersect svp2", svp2);
#endif
svp3 = art_svp_merge (svp1, svp2);
swr = art_svp_writer_rewind_new (ART_WIND_RULE_INTERSECT);
art_svp_intersector (svp3, swr);
svp_new = art_svp_writer_rewind_reap (swr);
art_free (svp3); /* shallow free because svp3 contains shared segments */
#ifdef ROBIN_DEBUG
dump_svp("art_svp_intersect svp_new", svp_new);
#endif
return svp_new;
#else
ArtSVP *svp3, *svp4, *svp_new;
svp3 = art_svp_merge_perturbed (svp1, svp2);
svp4 = art_svp_uncross (svp3);
art_svp_free (svp3);
svp_new = art_svp_rewind_uncrossed (svp4, ART_WIND_RULE_INTERSECT);
art_svp_free (svp4);
return svp_new;
#endif
}
/**
* art_svp_diff: Compute the symmetric difference of two sorted vector paths.
* @svp1: One sorted vector path.
* @svp2: The other sorted vector path.
*
* Computes the symmetric of the two argument svp's. Given two svp's
* with winding numbers of 0 and 1 everywhere, the resulting winding
* number will be 1 where either, but not both, of the argument svp's
* has a winding number 1, 0 otherwise. The result is newly allocated.
*
* Currently, this routine has accuracy problems pending the
* implementation of the new intersector.
*
* Return value: The symmetric difference of @svp1 and @svp2.
**/
ArtSVP *
art_svp_diff (const ArtSVP *svp1, const ArtSVP *svp2)
{
#ifdef ART_USE_NEW_INTERSECTOR
ArtSVP *svp3, *svp_new;
ArtSvpWriter *swr;
svp3 = art_svp_merge (svp1, svp2);
swr = art_svp_writer_rewind_new (ART_WIND_RULE_ODDEVEN);
art_svp_intersector (svp3, swr);
svp_new = art_svp_writer_rewind_reap (swr);
art_free (svp3); /* shallow free because svp3 contains shared segments */
return svp_new;
#else
ArtSVP *svp3, *svp4, *svp_new;
svp3 = art_svp_merge_perturbed (svp1, svp2);
svp4 = art_svp_uncross (svp3);
art_svp_free (svp3);
svp_new = art_svp_rewind_uncrossed (svp4, ART_WIND_RULE_ODDEVEN);
art_svp_free (svp4);
return svp_new;
#endif
}
/**
* art_svp_diff: Compute the symmetric difference of two sorted vector paths.
* @svp1: One sorted vector path.
* @svp2: The other sorted vector path.
*
* Computes the symmetric of the two argument svp's. Given two svp's
* with winding numbers of 0 and 1 everywhere, the resulting winding
* number will be 1 where either, but not both, of the argument svp's
* has a winding number 1, 0 otherwise. The result is newly allocated.
*
* Currently, this routine has accuracy problems pending the
* implementation of the new intersector.
*
* Return value: The symmetric difference of @svp1 and @svp2.
**/
ArtSVP *
art_svp_diff (const ArtSVP *svp1, const ArtSVP *svp2)
{
ArtSVP *svp3, *svp4, *svp_new;
svp3 = art_svp_merge_perturbed (svp1, svp2);
svp4 = art_svp_uncross (svp3);
art_svp_free (svp3);
svp_new = art_svp_rewind_uncrossed (svp4, ART_WIND_RULE_ODDEVEN);
art_svp_free (svp4);
return svp_new;
}
/**
* art_svp_intersect: Compute the intersection of two sorted vector paths.
* @svp1: One sorted vector path.
* @svp2: The other sorted vector path.
*
* Computes the intersection of the two argument svp's. Given two
* svp's with winding numbers of 0 and 1 everywhere, the resulting
* winding number will be 1 where both of the argument svp's has a
* winding number 1, 0 otherwise. The result is newly allocated.
*
* Currently, this routine has accuracy problems pending the
* implementation of the new intersector.
*
* Return value: The intersection of @svp1 and @svp2.
**/
ArtSVP *
art_svp_intersect (const ArtSVP *svp1, const ArtSVP *svp2)
{
ArtSVP *svp3, *svp4, *svp_new;
svp3 = art_svp_merge_perturbed (svp1, svp2);
svp4 = art_svp_uncross (svp3);
art_svp_free (svp3);
svp_new = art_svp_rewind_uncrossed (svp4, ART_WIND_RULE_INTERSECT);
art_svp_free (svp4);
return svp_new;
}
ArtSVP* run_intersector(ArtSVP*svp, ArtWindRule rule)
{
ArtSvpWriter * swr = art_svp_writer_rewind_new(rule);
double zoom = 1.0;
intbbox_t bbox = get_svp_bbox(svp, zoom);
art_svp_intersector(svp, swr);
ArtSVP*result = art_svp_writer_rewind_reap(swr);
clean_svp(result);
if(!check_svp(result)) {
current_svp = result;
art_report_error(); // might set art_error_in_intersector
} else {
msg("<verbose> Comparing polygon renderings of size %dx%d and %dx%d", bbox.width, bbox.height, bbox.width, bbox.height);
unsigned char*data1 = render_svp(svp, &bbox, zoom, rule);
unsigned char*data2 = render_svp(result, &bbox, zoom, ART_WIND_RULE_ODDEVEN);
if(!compare_bitmaps(&bbox, data1, data2)) {
msg("<verbose> Bad SVP rewinding result- polygons don't match");
current_svp = result;
art_report_error(); // might set art_error_in_intersector
}
free(data1);
free(data2);
}
if(art_error_in_intersector) {
msg("<verbose> Error in polygon processing");
art_svp_free(result);
art_error_in_intersector=0;
return 0;
}
return result;
}
static void
test_intersection(void)
{
ArtVpath vp0[] = {
{ ART_MOVETO, 10, 10},
{ ART_LINETO, 60, 60},
{ ART_LINETO, 110, 10},
{ ART_LINETO, 10, 10},
{ ART_END, 0, 0}
},
vp1[]= {
{ART_MOVETO, 110,34.999999999999993},
{ART_LINETO, 10,35},
{ART_LINETO, 10,36},
{ART_LINETO, 110,35.999999999999993},
{ART_LINETO, 110,34.999999999999993},
{ART_END, 0,0}
},
vp2[]= {
{ART_MOVETO, 110,35.999999999999993},
{ART_LINETO, 10,36},
{ART_LINETO, 10,37},
{ART_LINETO, 110,36.999999999999993},
{ART_LINETO, 110,35.999999999999993},
{ART_END, 0,0}
},
*vp[] = {vp0, vp1, vp2};
ArtSVP *svp[3], *svpi;
int i;
for(i=0; i<3; i++) {
svp[i]=art_svp_from_vpath(vp[i]);
printf("vpath[%d]\n", i);
print_vpath(vp[i]);
printf("svp[%d]\n", i);
print_svp(svp[i]);
}
for(i=2; i>0; i--) {
svpi = art_svp_intersect(svp[i],svp[0]);
printf("svp[%d] & svp[0]\n", i);
print_svp(svpi);
art_svp_free(svpi);
}
for(i=0; i<3; i++) {
art_svp_free(svp[i]);
}
}
/**
* art_svp_union: Compute the union of two sorted vector paths.
* @svp1: One sorted vector path.
* @svp2: The other sorted vector path.
*
* Computes the union of the two argument svp's. Given two svp's with
* winding numbers of 0 and 1 everywhere, the resulting winding number
* will be 1 where either (or both) of the argument svp's has a
* winding number 1, 0 otherwise. The result is newly allocated.
*
* Currently, this routine has accuracy problems pending the
* implementation of the new intersector.
*
* Return value: The union of @svp1 and @svp2.
**/
ArtSVP *
art_svp_union (const ArtSVP *svp1, const ArtSVP *svp2)
{
ArtSVP *svp3, *svp4, *svp_new;
svp3 = art_svp_merge_perturbed (svp1, svp2);
svp4 = art_svp_uncross (svp3);
art_svp_free (svp3);
svp_new = art_svp_rewind_uncrossed (svp4, ART_WIND_RULE_POSITIVE);
#ifdef VERBOSE
print_ps_svp (svp4);
print_ps_svp (svp_new);
#endif
art_svp_free (svp4);
return svp_new;
}
gfxline_t* gfxpoly_circular_to_evenodd(gfxline_t*line, double gridsize)
{
msg("<verbose> Converting circular-filled gfxline of %d segments to even-odd filled gfxline", gfxline_len(line));
ArtSVP* svp = gfxfillToSVP(line, 1);
ArtSVP* svp_rewinded;
svp_rewinded = run_intersector(svp, ART_WIND_RULE_NONZERO);
if(!svp_rewinded) {
art_svp_free(svp);
return 0;
}
gfxline_t* result = gfxline_from_gfxpoly((gfxpoly_t*)svp_rewinded);
art_svp_free(svp);
art_svp_free(svp_rewinded);
return result;
}
/**
* art_svp_vpath_stroke: Stroke a vector path.
* @vpath: #ArtVPath to stroke.
* @join: Join style.
* @cap: Cap style.
* @line_width: Width of stroke.
* @miter_limit: Miter limit.
* @flatness: Flatness.
*
* Computes an svp representing the stroked outline of @vpath. The
* width of the stroked line is @line_width.
*
* Lines are joined according to the @join rule. Possible values are
* ART_PATH_STROKE_JOIN_MITER (for mitered joins),
* ART_PATH_STROKE_JOIN_ROUND (for round joins), and
* ART_PATH_STROKE_JOIN_BEVEL (for bevelled joins). The mitered join
* is converted to a bevelled join if the miter would extend to a
* distance of more than @miter_limit * @line_width from the actual
* join point.
*
* If there are open subpaths, the ends of these subpaths are capped
* according to the @cap rule. Possible values are
* ART_PATH_STROKE_CAP_BUTT (squared cap, extends exactly to end
* point), ART_PATH_STROKE_CAP_ROUND (rounded half-circle centered at
* the end point), and ART_PATH_STROKE_CAP_SQUARE (squared cap,
* extending half @line_width past the end point).
*
* The @flatness parameter controls the accuracy of the rendering. It
* is most important for determining the number of points to use to
* approximate circular arcs for round lines and joins. In general, the
* resulting vector path will be within @flatness pixels of the "ideal"
* path containing actual circular arcs. I reserve the right to use
* the @flatness parameter to convert bevelled joins to miters for very
* small turn angles, as this would reduce the number of points in the
* resulting outline path.
*
* The resulting path is "clean" with respect to self-intersections, i.e.
* the winding number is 0 or 1 at each point.
*
* Return value: Resulting stroked outline in svp format.
**/
ArtSVP *
art_svp_vpath_stroke (ArtVpath *vpath,
ArtPathStrokeJoinType join,
ArtPathStrokeCapType cap,
double line_width,
double miter_limit,
double flatness)
{
ArtVpath *vpath_stroke, *vpath2;
ArtSVP *svp, *svp2, *svp3;
vpath_stroke = art_svp_vpath_stroke_raw (vpath, join, cap,
line_width, miter_limit, flatness);
#ifdef VERBOSE
print_ps_vpath (vpath_stroke);
#endif
vpath2 = art_vpath_perturb (vpath_stroke);
#ifdef VERBOSE
print_ps_vpath (vpath2);
#endif
art_free (vpath_stroke);
svp = art_svp_from_vpath (vpath2);
#ifdef VERBOSE
print_ps_svp (svp);
#endif
art_free (vpath2);
svp2 = art_svp_uncross (svp);
#ifdef VERBOSE
print_ps_svp (svp2);
#endif
art_svp_free (svp);
svp3 = art_svp_rewind_uncrossed (svp2, ART_WIND_RULE_NONZERO);
#ifdef VERBOSE
print_ps_svp (svp3);
#endif
art_svp_free (svp2);
return svp3;
}
gfxpoly_t* gfxpoly_from_fill(gfxline_t*line, double gridsize)
{
/* I'm not sure whether doing perturbation here is actually
a good idea- if that line has been run through the machinery
several times already, it might be safer to leave it alone,
since it should already be in a format libart can handle */
#ifdef PERTURBATE
ArtSVP* svp = gfxfillToSVP(line, 1);
#else
ArtSVP* svp = gfxfillToSVP(line, 0);
#endif
#ifdef DEBUG
char filename[80];
static int counter = 0;
sprintf(filename, "svp%d.ps", counter);
write_svp_postscript(filename, svp);
sprintf(filename, "gfxline%d.ps", counter);
write_gfxline_postscript(filename, line);
#endif
/* we do xor-filling by default, so dir is always 1
(actually for oddeven rewinding it makes no difference, but
it's "cleaner")
*/
int t;
for(t=0; t<svp->n_segs; t++) {
svp->segs[t].dir = 1;
}
/* for some reason, we need to rewind / self-intersect the polygons that gfxfillToSVP
returns- art probably uses a different fill mode (circular?) for vpaths */
ArtSVP*svp_uncrossed=0;
#ifdef DEBUG
sprintf(filename, "svp%d_in.ps", counter);
write_svp_postscript(filename, svp);
counter++;
#endif
svp_uncrossed = run_intersector(svp, ART_WIND_RULE_ODDEVEN);
art_svp_free(svp);
svp=svp_uncrossed;
return (gfxpoly_t*)svp;
}
/**
* art_svp_vpath_stroke: Stroke a vector path.
* @vpath: #ArtVPath to stroke.
* @join: Join style.
* @cap: Cap style.
* @line_width: Width of stroke.
* @miter_limit: Miter limit.
* @flatness: Flatness.
*
* Computes an svp representing the stroked outline of @vpath. The
* width of the stroked line is @line_width.
*
* Lines are joined according to the @join rule. Possible values are
* ART_PATH_STROKE_JOIN_MITER (for mitered joins),
* ART_PATH_STROKE_JOIN_ROUND (for round joins), and
* ART_PATH_STROKE_JOIN_BEVEL (for bevelled joins). The mitered join
* is converted to a bevelled join if the miter would extend to a
* distance of more than @miter_limit * @line_width from the actual
* join point.
*
* If there are open subpaths, the ends of these subpaths are capped
* according to the @cap rule. Possible values are
* ART_PATH_STROKE_CAP_BUTT (squared cap, extends exactly to end
* point), ART_PATH_STROKE_CAP_ROUND (rounded half-circle centered at
* the end point), and ART_PATH_STROKE_CAP_SQUARE (squared cap,
* extending half @line_width past the end point).
*
* The @flatness parameter controls the accuracy of the rendering. It
* is most important for determining the number of points to use to
* approximate circular arcs for round lines and joins. In general, the
* resulting vector path will be within @flatness pixels of the "ideal"
* path containing actual circular arcs. I reserve the right to use
* the @flatness parameter to convert bevelled joins to miters for very
* small turn angles, as this would reduce the number of points in the
* resulting outline path.
*
* The resulting path is "clean" with respect to self-intersections, i.e.
* the winding number is 0 or 1 at each point.
*
* Return value: Resulting stroked outline in svp format.
**/
ArtSVP *
art_svp_vpath_stroke (ArtVpath *vpath,
ArtPathStrokeJoinType join,
ArtPathStrokeCapType cap,
double line_width,
double miter_limit,
double flatness)
{
#ifdef ART_USE_NEW_INTERSECTOR
ArtVpath *vpath_stroke;
ArtSVP *svp, *svp2;
ArtSvpWriter *swr;
vpath_stroke = art_svp_vpath_stroke_raw (vpath, join, cap,
line_width, miter_limit, flatness);
#ifdef VERBOSE
print_ps_vpath (vpath_stroke);
#endif
svp = art_svp_from_vpath (vpath_stroke);
#ifdef VERBOSE
print_ps_svp (svp);
#endif
art_free (vpath_stroke);
swr = art_svp_writer_rewind_new (ART_WIND_RULE_NONZERO);
art_svp_intersector (svp, swr);
svp2 = art_svp_writer_rewind_reap (swr);
#ifdef VERBOSE
print_ps_svp (svp2);
#endif
art_svp_free (svp);
return svp2;
#else
ArtVpath *vpath_stroke, *vpath2;
ArtSVP *svp, *svp2, *svp3;
vpath_stroke = art_svp_vpath_stroke_raw (vpath, join, cap,
line_width, miter_limit, flatness);
#ifdef VERBOSE
print_ps_vpath (vpath_stroke);
#endif
vpath2 = art_vpath_perturb (vpath_stroke);
#ifdef VERBOSE
print_ps_vpath (vpath2);
#endif
art_free (vpath_stroke);
svp = art_svp_from_vpath (vpath2);
#ifdef VERBOSE
print_ps_svp (svp);
#endif
art_free (vpath2);
svp2 = art_svp_uncross (svp);
#ifdef VERBOSE
print_ps_svp (svp2);
#endif
art_svp_free (svp);
svp3 = art_svp_rewind_uncrossed (svp2, ART_WIND_RULE_NONZERO);
#ifdef VERBOSE
print_ps_svp (svp3);
#endif
art_svp_free (svp2);
return svp3;
#endif
}
static void
test_intersect (void)
{
ArtVpath vpath[] = {
#if 0
/* two triangles */
{ ART_MOVETO, 100, 100 },
{ ART_LINETO, 300, 400 },
{ ART_LINETO, 400, 200 },
{ ART_LINETO, 100, 100 },
{ ART_MOVETO, 110, 110 },
{ ART_LINETO, 310, 410 },
{ ART_LINETO, 410, 210 },
{ ART_LINETO, 110, 110 },
#endif
#if 0
/* a bowtie */
{ ART_MOVETO, 100, 100 },
{ ART_LINETO, 400, 400 },
{ ART_LINETO, 400, 100 },
{ ART_LINETO, 100, 400 },
{ ART_LINETO, 100, 100 },
#endif
#if 1
/* a square */
{ ART_MOVETO, 100, 100 },
{ ART_LINETO, 100, 400 },
{ ART_LINETO, 400, 400 },
{ ART_LINETO, 400, 100 },
{ ART_LINETO, 100, 100 },
#endif
#if 1
/* another square */
#define XOFF 10
#define YOFF 10
{ ART_MOVETO, 100 + XOFF, 100 + YOFF },
{ ART_LINETO, 100 + XOFF, 400 + YOFF },
{ ART_LINETO, 400 + XOFF, 400 + YOFF },
{ ART_LINETO, 400 + XOFF, 100 + YOFF },
{ ART_LINETO, 100 + XOFF, 100 + YOFF },
#endif
{ ART_END, 0, 0}
};
ArtSVP *svp, *svp2;
ArtSvpWriter *swr;
svp = art_svp_from_vpath (vpath);
#define RUN_INTERSECT
#ifdef RUN_INTERSECT
swr = art_svp_writer_rewind_new (ART_WIND_RULE_ODDEVEN);
art_svp_intersector (svp, swr);
svp2 = art_svp_writer_rewind_reap (swr);
#endif
#if 0
output_svp_ppm (svp2);
#else
print_svp (svp2);
#endif
art_svp_free (svp);
#ifdef RUN_INTERSECT
art_svp_free (svp2);
#endif
}
static void
make_testpat (void)
{
ArtVpath *vpath, *vpath2, *vpath3;
ArtSVP *svp, *svp2;
ArtSVP *svp3;
art_u8 buf[512 * 512 * BYTES_PP];
int i, j;
int iter;
art_u8 colorimg[256][256][3];
art_u8 rgbaimg[256][256][4];
art_u8 bitimg[16][2];
int x, y;
double affine[6];
double affine2[6];
double affine3[6];
ArtAlphaGamma *alphagamma;
double dash_data[] = { 20 };
ArtVpathDash dash;
dash.offset = 0;
dash.n_dash = 1;
dash.dash = dash_data;
#ifdef TEST_AFFINE
test_affine ();
exit (0);
#endif
vpath = randstar (50);
svp = art_svp_from_vpath (vpath);
art_free (vpath);
vpath2 = randstar (50);
#if 1
vpath3 = art_vpath_dash (vpath2, &dash);
art_free (vpath2);
svp2 = art_svp_vpath_stroke (vpath3,
ART_PATH_STROKE_JOIN_MITER,
ART_PATH_STROKE_CAP_BUTT,
15,
4,
0.5);
art_free (vpath3);
#else
svp2 = art_svp_from_vpath (vpath2);
#endif
#if 1
svp3 = art_svp_intersect (svp, svp2);
#else
svp3 = svp2;
#endif
#if 0
print_svp (svp);
#endif
for (y = 0; y < 256; y++)
for (x = 0; x < 256; x++)
{
colorimg[y][x][0] = (x + y) >> 1;
colorimg[y][x][1] = (x + (255 - y)) >> 1;
colorimg[y][x][2] = ((255 - x) + y) >> 1;
rgbaimg[y][x][0] = (x + y) >> 1;
rgbaimg[y][x][1] = (x + (255 - y)) >> 1;
rgbaimg[y][x][2] = ((255 - x) + y) >> 1;
rgbaimg[y][x][3] = y;
}
for (y = 0; y < 16; y++)
for (x = 0; x < 2; x++)
bitimg[y][x] = (x << 4) | y;
affine[0] = 0.5;
affine[1] = .2;
affine[2] = -.2;
affine[3] = 0.5;
affine[4] = 64;
affine[5] = 64;
affine2[0] = 1;
affine2[1] = -.2;
affine2[2] = .2;
affine2[3] = 1;
affine2[4] = 128;
affine2[5] = 128;
affine3[0] = 5;
affine3[1] = -.2;
affine3[2] = .2;
affine3[3] = 5;
affine3[4] = 384;
affine3[5] = 32;
#if 0
alphagamma = art_alphagamma_new (1.8);
#else
alphagamma = NULL;
#endif
#ifdef COLOR
printf ("P6\n512 512\n255\n");
#else
printf ("P5\n512 512\n255\n");
#endif
for (iter = 0; iter < NUM_ITERS; iter++)
for (j = 0; j < 512; j += TILE_SIZE)
for (i = 0; i < 512; i += TILE_SIZE)
{
#ifdef COLOR
art_rgb_svp_aa (svp, i, j, i + TILE_SIZE, j + TILE_SIZE,
0xffe0a0, 0x100040,
buf + (j * 512 + i) * BYTES_PP, 512 * BYTES_PP,
alphagamma);
art_rgb_svp_alpha (svp2, i, j, i + TILE_SIZE, j + TILE_SIZE,
0xff000080,
buf + (j * 512 + i) * BYTES_PP, 512 * BYTES_PP,
alphagamma);
art_rgb_svp_alpha (svp3, i, j, i + TILE_SIZE, j + TILE_SIZE,
0x00ff0080,
buf + (j * 512 + i) * BYTES_PP, 512 * BYTES_PP,
alphagamma);
art_rgb_affine (buf + (j * 512 + i) * BYTES_PP,
i, j, i + TILE_SIZE, j + TILE_SIZE, 512 * BYTES_PP,
(art_u8 *)colorimg, 256, 256, 256 * 3,
affine,
ART_FILTER_NEAREST, alphagamma);
art_rgb_rgba_affine (buf + (j * 512 + i) * BYTES_PP,
i, j, i + TILE_SIZE, j + TILE_SIZE,
512 * BYTES_PP,
(art_u8 *)rgbaimg, 256, 256, 256 * 4,
affine2,
ART_FILTER_NEAREST, alphagamma);
art_rgb_bitmap_affine (buf + (j * 512 + i) * BYTES_PP,
i, j, i + TILE_SIZE, j + TILE_SIZE,
512 * BYTES_PP,
(art_u8 *)bitimg, 16, 16, 2,
0xffff00ff,
affine3,
ART_FILTER_NEAREST, alphagamma);
#else
art_gray_svp_aa (svp, i, j, i + TILE_SIZE, j + TILE_SIZE,
buf + (j * 512 + i) * BYTES_PP, 512 * BYTES_PP);
#endif
}
art_svp_free (svp2);
art_svp_free (svp3);
art_svp_free (svp);
#if 1
fwrite (buf, 1, 512 * 512 * BYTES_PP, stdout);
#endif
}
void art_draw_poly(art_buffer_p buffer, art_context_p context, int filled,
float *x, float *y, int n, int closed)
{
ArtVpath *vec, *vec2;
ArtSVP *svp;
double dash_data[2];
ArtVpathDash dash;
ArtDRect drect;
ArtIRect irect;
int i, mark = 0;
vec = art_new(ArtVpath, n + 1 + closed);
for(i = 0; i < n; i++) {
vec[mark].code = i ? ART_LINETO : ART_MOVETO;
if(i == 0 || i == n - 1 || hypot(x[i] - vec[mark - 1].x,
(buffer->height - y[i]) -
vec[mark - 1].y) > 1.0) {
vec[mark].x = x[i];
vec[mark].y = buffer->height - y[i];
mark++;
}
}
n = mark;
if(closed) {
vec[n].code = ART_LINETO;
vec[n].x = vec[0].x;
vec[n].y = vec[0].y;
}
vec[n + closed].code = ART_END;
vec[n + closed].x = 0;
vec[n + closed].y = 0;
if(context->current_dash_on > 0) {
dash.offset = 0;
dash_data[0] = context->current_dash_on;
dash_data[1] = context->current_dash_off;
dash.n_dash = 2;
dash.dash = dash_data;
vec2 = art_vpath_dash(vec, &dash);
art_free(vec);
vec = vec2;
}
if(filled)
svp = art_svp_from_vpath(vec);
else
svp = art_svp_vpath_stroke(vec, context->current_jointype,
context->current_captype,
context->current_linewidth,
context->current_miterlimit,
context->current_flatness);
art_free(vec);
art_drect_svp(&drect, svp);
art_drect_to_irect(&irect, &drect);
if(irect.x1 > buffer->width)
irect.x1 = buffer->width;
if(irect.y1 > buffer->height)
irect.y1 = buffer->height;
if(irect.x0 < 0)
irect.x0 = 0;
if(irect.y0 < 0)
irect.y0 = 0;
art_rgb_svp_alpha(svp, irect.x0, irect.y0, irect.x1, irect.y1,
context->current_color,
buffer->buffer + (irect.y0 * buffer->width + irect.x0) * 3,
buffer->width * 3, NULL);
art_svp_free(svp);
}
void finalize_selectregion(void)
{
GList *itemlist;
struct Item *item;
ArtVpath *vpath;
ArtSVP *lassosvp;
int i, n;
double *pt;
ui.cur_item_type = ITEM_NONE;
// build SVP for the lasso path
n = ui.cur_path.num_points;
vpath = g_malloc((n+2)*sizeof(ArtVpath));
for (i=0; i<n; i++) {
vpath[i].x = ui.cur_path.coords[2*i];
vpath[i].y = ui.cur_path.coords[2*i+1];
}
vpath[n].x = vpath[0].x; vpath[n].y = vpath[0].y;
vpath[0].code = ART_MOVETO;
for (i=1; i<=n; i++) vpath[i].code = ART_LINETO;
vpath[n+1].code = ART_END;
lassosvp = art_svp_from_vpath(vpath);
g_free(vpath);
// see which items we selected
for (itemlist = ui.selection->layer->items; itemlist!=NULL; itemlist = itemlist->next) {
item = (struct Item *)itemlist->data;
if (hittest_item(lassosvp, item)) {
// update the selection bbox
if (ui.selection->items==NULL || ui.selection->bbox.left>item->bbox.left)
ui.selection->bbox.left = item->bbox.left;
if (ui.selection->items==NULL || ui.selection->bbox.right<item->bbox.right)
ui.selection->bbox.right = item->bbox.right;
if (ui.selection->items==NULL || ui.selection->bbox.top>item->bbox.top)
ui.selection->bbox.top = item->bbox.top;
if (ui.selection->items==NULL || ui.selection->bbox.bottom<item->bbox.bottom)
ui.selection->bbox.bottom = item->bbox.bottom;
// add the item
ui.selection->items = g_list_append(ui.selection->items, item);
}
}
art_svp_free(lassosvp);
if (ui.selection->items == NULL) {
// if we clicked inside a text zone or image?
pt = ui.cur_path.coords;
item = click_is_in_text_or_image(ui.selection->layer, pt[0], pt[1]);
if (item!=NULL) {
for (i=0; i<n; i++, pt+=2) {
if (pt[0]<item->bbox.left || pt[0]>item->bbox.right || pt[1]<item->bbox.top || pt[1]>item->bbox.bottom)
{ item = NULL; break; }
}
}
if (item!=NULL) {
ui.selection->items = g_list_append(ui.selection->items, item);
g_memmove(&(ui.selection->bbox), &(item->bbox), sizeof(struct BBox));
}
}
if (ui.selection->items == NULL) reset_selection();
else { // make a selection rectangle instead of the lasso shape
gtk_object_destroy(GTK_OBJECT(ui.selection->canvas_item));
ui.selection->canvas_item = gnome_canvas_item_new(ui.cur_layer->group,
gnome_canvas_rect_get_type(), "width-pixels", 1,
"outline-color-rgba", 0x000000ff,
"fill-color-rgba", 0x80808040,
"x1", ui.selection->bbox.left, "x2", ui.selection->bbox.right,
"y1", ui.selection->bbox.top, "y2", ui.selection->bbox.bottom, NULL);
make_dashed(ui.selection->canvas_item);
ui.selection->type = ITEM_SELECTRECT;
}
update_cursor();
update_copy_paste_enabled();
update_font_button();
}
void gfxpoly_destroy(gfxpoly_t*poly)
{
ArtSVP*svp = (ArtSVP*)poly;
art_svp_free(svp);
}