[Bf-blender-cvs] SVN commit: /data/svn/bf-blender [55289] trunk/blender/source/blender/ blenlib: move polygon intersection out of BLI_lasso into BLI_math_geom since its a generally useful function .
Campbell Barton
ideasman42 at gmail.com
Thu Mar 14 22:44:17 CET 2013
Revision: 55289
http://projects.blender.org/scm/viewvc.php?view=rev&root=bf-blender&revision=55289
Author: campbellbarton
Date: 2013-03-14 21:44:16 +0000 (Thu, 14 Mar 2013)
Log Message:
-----------
move polygon intersection out of BLI_lasso into BLI_math_geom since its a generally useful function.
adds:
- isect_point_poly_v2()
- isect_point_poly_v2_int()
Modified Paths:
--------------
trunk/blender/source/blender/blenlib/BLI_math_geom.h
trunk/blender/source/blender/blenlib/intern/lasso.c
trunk/blender/source/blender/blenlib/intern/math_geom.c
Modified: trunk/blender/source/blender/blenlib/BLI_math_geom.h
===================================================================
--- trunk/blender/source/blender/blenlib/BLI_math_geom.h 2013-03-14 19:40:42 UTC (rev 55288)
+++ trunk/blender/source/blender/blenlib/BLI_math_geom.h 2013-03-14 21:44:16 UTC (rev 55289)
@@ -135,13 +135,15 @@
const float v0[3], const float v1[3], const float v2[3], float *r_lambda, float r_uv[2], const float epsilon);
/* point in polygon */
+bool isect_point_poly_v2(const float pt[2], const float verts[][2], const int nr);
+bool isect_point_poly_v2_int(const int pt[2], const int verts[][2], const int nr);
+
int isect_point_quad_v2(const float p[2], const float a[2], const float b[2], const float c[2], const float d[2]);
int isect_point_tri_v2(const float pt[2], const float v1[2], const float v2[2], const float v3[2]);
int isect_point_tri_v2_cw(const float pt[2], const float v1[2], const float v2[2], const float v3[2]);
int isect_point_tri_v2_int(const int x1, const int y1, const int x2, const int y2, const int a, const int b);
int isect_point_tri_prism_v3(const float p[3], const float v1[3], const float v2[3], const float v3[3]);
-
void isect_point_quad_uv_v2(const float v0[2], const float v1[2], const float v2[2], const float v3[2],
const float pt[2], float r_uv[2]);
void isect_point_face_uv_v2(const int isquad, const float v0[2], const float v1[2], const float v2[2],
Modified: trunk/blender/source/blender/blenlib/intern/lasso.c
===================================================================
--- trunk/blender/source/blender/blenlib/intern/lasso.c 2013-03-14 19:40:42 UTC (rev 55288)
+++ trunk/blender/source/blender/blenlib/intern/lasso.c 2013-03-14 21:44:16 UTC (rev 55289)
@@ -57,46 +57,13 @@
const int sx, const int sy,
const int error_value)
{
- /* we do the angle rule, define that all added angles should be about zero or (2 * PI) */
- float angletot = 0.0, dot, ang, cross, fp1[2], fp2[2];
- int a;
- const int *p1, *p2;
-
if (sx == error_value) {
return false;
}
-
- p1 = mcords[moves - 1];
- p2 = mcords[0];
-
- /* first vector */
- fp1[0] = (float)(p1[0] - sx);
- fp1[1] = (float)(p1[1] - sy);
- normalize_v2(fp1);
-
- for (a = 0; a < moves; a++) {
- /* second vector */
- fp2[0] = (float)(p2[0] - sx);
- fp2[1] = (float)(p2[1] - sy);
- normalize_v2(fp2);
-
- /* dot and angle and cross */
- dot = fp1[0] * fp2[0] + fp1[1] * fp2[1];
- ang = fabs(saacos(dot));
-
- cross = (float)((p1[1] - p2[1]) * (p1[0] - sx) + (p2[0] - p1[0]) * (p1[1] - sy));
-
- if (cross < 0.0f) angletot -= ang;
- else angletot += ang;
-
- /* circulate */
- fp1[0] = fp2[0]; fp1[1] = fp2[1];
- p1 = p2;
- p2 = mcords[a + 1];
+ else {
+ int pt[2] = {sx, sy};
+ return isect_point_poly_v2_int(pt, mcords, moves);
}
-
- if (fabsf(angletot) > 4.0f) return true;
- return false;
}
/* edge version for lasso select. we assume boundbox check was done */
Modified: trunk/blender/source/blender/blenlib/intern/math_geom.c
===================================================================
--- trunk/blender/source/blender/blenlib/intern/math_geom.c 2013-03-14 19:40:42 UTC (rev 55288)
+++ trunk/blender/source/blender/blenlib/intern/math_geom.c 2013-03-14 21:44:16 UTC (rev 55289)
@@ -728,6 +728,86 @@
return 1;
}
+/* point in polygon (keep float and int versions in sync) */
+bool isect_point_poly_v2(const float pt[2], const float verts[][2], const int nr)
+{
+ /* we do the angle rule, define that all added angles should be about zero or (2 * PI) */
+ float angletot = 0.0;
+ float fp1[2], fp2[2];
+ int i;
+ const float *p1, *p2;
+
+ p1 = verts[nr - 1];
+ p2 = verts[0];
+
+ /* first vector */
+ fp1[0] = (float)(p1[0] - pt[0]);
+ fp1[1] = (float)(p1[1] - pt[1]);
+ normalize_v2(fp1);
+
+ for (i = 0; i < nr; i++) {
+ float dot, ang, cross;
+ /* second vector */
+ fp2[0] = (float)(p2[0] - pt[0]);
+ fp2[1] = (float)(p2[1] - pt[1]);
+ normalize_v2(fp2);
+
+ /* dot and angle and cross */
+ dot = dot_v2v2(fp1, fp2);
+ ang = fabsf(saacos(dot));
+ cross = (float)((p1[1] - p2[1]) * (p1[0] - pt[0]) + (p2[0] - p1[0]) * (p1[1] - pt[1]));
+
+ if (cross < 0.0f) angletot -= ang;
+ else angletot += ang;
+
+ /* circulate */
+ copy_v2_v2(fp1, fp2);
+ p1 = p2;
+ p2 = verts[i + 1];
+ }
+
+ return (fabsf(angletot) > 4.0f);
+}
+bool isect_point_poly_v2_int(const int pt[2], const int verts[][2], const int nr)
+{
+ /* we do the angle rule, define that all added angles should be about zero or (2 * PI) */
+ float angletot = 0.0;
+ float fp1[2], fp2[2];
+ int i;
+ const int *p1, *p2;
+
+ p1 = verts[nr - 1];
+ p2 = verts[0];
+
+ /* first vector */
+ fp1[0] = (float)(p1[0] - pt[0]);
+ fp1[1] = (float)(p1[1] - pt[1]);
+ normalize_v2(fp1);
+
+ for (i = 0; i < nr; i++) {
+ float dot, ang, cross;
+ /* second vector */
+ fp2[0] = (float)(p2[0] - pt[0]);
+ fp2[1] = (float)(p2[1] - pt[1]);
+ normalize_v2(fp2);
+
+ /* dot and angle and cross */
+ dot = dot_v2v2(fp1, fp2);
+ ang = fabsf(saacos(dot));
+ cross = (float)((p1[1] - p2[1]) * (p1[0] - pt[0]) + (p2[0] - p1[0]) * (p1[1] - pt[1]));
+
+ if (cross < 0.0f) angletot -= ang;
+ else angletot += ang;
+
+ /* circulate */
+ copy_v2_v2(fp1, fp2);
+ p1 = p2;
+ p2 = verts[i + 1];
+ }
+
+ return (fabsf(angletot) > 4.0f);
+}
+
/* point in tri */
/* only single direction */
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