static PyObject *M_Geometry_intersect_line_line_2d(PyObject *UNUSED(self), PyObject *args)
{
VectorObject *line_a1, *line_a2, *line_b1, *line_b2;
float vi[2];
if (!PyArg_ParseTuple(args, "O!O!O!O!:intersect_line_line_2d",
&vector_Type, &line_a1,
&vector_Type, &line_a2,
&vector_Type, &line_b1,
&vector_Type, &line_b2))
{
return NULL;
}
if (BaseMath_ReadCallback(line_a1) == -1 ||
BaseMath_ReadCallback(line_a2) == -1 ||
BaseMath_ReadCallback(line_b1) == -1 ||
BaseMath_ReadCallback(line_b2) == -1)
{
return NULL;
}
if (isect_seg_seg_v2_point(line_a1->vec, line_a2->vec, line_b1->vec, line_b2->vec, vi) == 1) {
return Vector_CreatePyObject(vi, 2, Py_NEW, NULL);
}
else {
Py_RETURN_NONE;
}
}
static bool testVoronoiEdge(const float site[2], const float point[2], const VoronoiEdge *edge)
{
float p[2];
if (isect_seg_seg_v2_point(site, point, edge->start, edge->end, p) == 1) {
if (len_squared_v2v2(p, edge->start) > VORONOI_EPS &&
len_squared_v2v2(p, edge->end) > VORONOI_EPS) {
return false;
}
}
return true;
}
static void voronoi_clampEdgeVertex(int width, int height, float *coord, float *other_coord)
{
const float corners[4][2] = {
{0.0f, 0.0f}, {width - 1, 0.0f}, {width - 1, height - 1}, {0.0f, height - 1}};
int i;
if (IN_RANGE_INCL(coord[0], 0, width - 1) && IN_RANGE_INCL(coord[1], 0, height - 1)) {
return;
}
for (i = 0; i < 4; i++) {
float v1[2], v2[2];
float p[2];
copy_v2_v2(v1, corners[i]);
if (i == 3) {
copy_v2_v2(v2, corners[0]);
}
else {
copy_v2_v2(v2, corners[i + 1]);
}
if (isect_seg_seg_v2_point(v1, v2, coord, other_coord, p) == 1) {
if (i == 0 && coord[1] > p[1]) {
continue;
}
if (i == 1 && coord[0] < p[0]) {
continue;
}
if (i == 2 && coord[1] < p[1]) {
continue;
}
if (i == 3 && coord[0] > p[0]) {
continue;
}
copy_v2_v2(coord, p);
}
}
}
static void feather_bucket_check_intersect(
float (*feather_points)[2], int tot_feather_point, FeatherEdgesBucket *bucket,
int cur_a, int cur_b)
{
int i;
const float *v1 = (float *) feather_points[cur_a];
const float *v2 = (float *) feather_points[cur_b];
for (i = 0; i < bucket->tot_segment; i++) {
int check_a = bucket->segments[i][0];
int check_b = bucket->segments[i][1];
const float *v3 = (float *) feather_points[check_a];
const float *v4 = (float *) feather_points[check_b];
if (check_a >= cur_a - 1 || cur_b == check_a)
continue;
if (isect_seg_seg_v2_simple(v1, v2, v3, v4)) {
int k;
float p[2];
float min_a[2], max_a[2];
float min_b[2], max_b[2];
isect_seg_seg_v2_point(v1, v2, v3, v4, p);
INIT_MINMAX2(min_a, max_a);
INIT_MINMAX2(min_b, max_b);
/* collapse loop with smaller AABB */
for (k = 0; k < tot_feather_point; k++) {
if (k >= check_b && k <= cur_a) {
minmax_v2v2_v2(min_a, max_a, feather_points[k]);
}
else {
minmax_v2v2_v2(min_b, max_b, feather_points[k]);
}
}
if (max_a[0] - min_a[0] < max_b[0] - min_b[0] ||
max_a[1] - min_a[1] < max_b[1] - min_b[1])
{
for (k = check_b; k <= cur_a; k++) {
copy_v2_v2(feather_points[k], p);
}
}
else {
for (k = 0; k <= check_a; k++) {
copy_v2_v2(feather_points[k], p);
}
if (cur_b != 0) {
for (k = cur_b; k < tot_feather_point; k++) {
copy_v2_v2(feather_points[k], p);
}
}
}
}
}
}
static bool scanfill_preprocess_self_isect(
ScanFillContext *sf_ctx,
PolyInfo *poly_info,
const unsigned short poly_nr,
ListBase *filledgebase)
{
PolyInfo *pi = &poly_info[poly_nr];
GHash *isect_hash = NULL;
ListBase isect_lb = {NULL};
/* warning, O(n2) check here, should use spatial lookup */
{
ScanFillEdge *eed;
for (eed = pi->edge_first;
eed;
eed = (eed == pi->edge_last) ? NULL : eed->next)
{
ScanFillEdge *eed_other;
for (eed_other = eed->next;
eed_other;
eed_other = (eed_other == pi->edge_last) ? NULL : eed_other->next)
{
if (!ELEM(eed->v1, eed_other->v1, eed_other->v2) &&
!ELEM(eed->v2, eed_other->v1, eed_other->v2) &&
(eed != eed_other))
{
/* check isect */
float pt[2];
BLI_assert(eed != eed_other);
if (isect_seg_seg_v2_point(eed->v1->co, eed->v2->co,
eed_other->v1->co, eed_other->v2->co,
pt) == 1)
{
ScanFillIsect *isect;
if (UNLIKELY(isect_hash == NULL)) {
isect_hash = BLI_ghash_ptr_new(__func__);
}
isect = MEM_mallocN(sizeof(ScanFillIsect), __func__);
BLI_addtail(&isect_lb, isect);
copy_v2_v2(isect->co, pt);
isect->co[2] = eed->v1->co[2];
isect->v = BLI_scanfill_vert_add(sf_ctx, isect->co);
isect->v->poly_nr = eed->v1->poly_nr; /* NOTE: vert may belong to 2 polys now */
VFLAG_SET(isect->v, V_ISISECT);
edge_isect_ls_add(isect_hash, eed, isect);
edge_isect_ls_add(isect_hash, eed_other, isect);
}
}
}
}
}
if (isect_hash == NULL) {
return false;
}
/* now subdiv the edges */
{
ScanFillEdge *eed;
for (eed = pi->edge_first;
eed;
eed = (eed == pi->edge_last) ? NULL : eed->next)
{
if (eed->user_flag & E_ISISECT) {
ListBase *e_ls = BLI_ghash_lookup(isect_hash, eed);
LinkData *isect_link;
/* maintain coorect terminating edge */
if (pi->edge_last == eed) {
pi->edge_last = NULL;
}
if (BLI_listbase_is_single(e_ls) == false) {
BLI_sortlist_r(e_ls, eed->v2->co, edge_isect_ls_sort_cb);
}
/* move original edge to filledgebase and add replacement
* (which gets subdivided next) */
{
ScanFillEdge *eed_tmp;
eed_tmp = BLI_scanfill_edge_add(sf_ctx, eed->v1, eed->v2);
BLI_remlink(&sf_ctx->filledgebase, eed_tmp);
BLI_insertlinkafter(&sf_ctx->filledgebase, eed, eed_tmp);
BLI_remlink(&sf_ctx->filledgebase, eed);
BLI_addtail(filledgebase, eed);
if (pi->edge_first == eed) {
pi->edge_first = eed_tmp;
}
eed = eed_tmp;
}
for (isect_link = e_ls->first; isect_link; isect_link = isect_link->next) {
ScanFillIsect *isect = isect_link->data;
ScanFillEdge *eed_subd;
eed_subd = BLI_scanfill_edge_add(sf_ctx, isect->v, eed->v2);
eed_subd->poly_nr = poly_nr;
eed->v2 = isect->v;
BLI_remlink(&sf_ctx->filledgebase, eed_subd);
BLI_insertlinkafter(&sf_ctx->filledgebase, eed, eed_subd);
/* step to the next edge and continue dividing */
eed = eed_subd;
}
BLI_freelistN(e_ls);
MEM_freeN(e_ls);
if (pi->edge_last == NULL) {
pi->edge_last = eed;
}
}
}
}
BLI_freelistN(&isect_lb);
BLI_ghash_free(isect_hash, NULL, NULL);
{
ScanFillEdge *e_init;
ScanFillEdge *e_curr;
ScanFillEdge *e_next;
ScanFillVert *v_prev;
ScanFillVert *v_curr;
int inside = false;
/* first vert */
#if 0
e_init = pi->edge_last;
e_curr = e_init;
e_next = pi->edge_first;
v_prev = e_curr->v1;
v_curr = e_curr->v2;
#else
/* find outside vertex */
{
ScanFillEdge *eed;
ScanFillEdge *eed_prev;
float min_x = FLT_MAX;
e_curr = pi->edge_last;
e_next = pi->edge_first;
eed_prev = pi->edge_last;
for (eed = pi->edge_first;
eed;
eed = (eed == pi->edge_last) ? NULL : eed->next)
{
if (eed->v2->co[0] < min_x) {
min_x = eed->v2->co[0];
e_curr = eed_prev;
e_next = eed;
}
eed_prev = eed;
}
e_init = e_curr;
v_prev = e_curr->v1;
v_curr = e_curr->v2;
}
#endif
BLI_assert(e_curr->poly_nr == poly_nr);
BLI_assert(pi->edge_last->poly_nr == poly_nr);
do {
ScanFillVert *v_next;
v_next = (e_next->v1 == v_curr) ? e_next->v2 : e_next->v1;
BLI_assert(ELEM(v_curr, e_next->v1, e_next->v2));
/* track intersections */
if (inside) {
EFLAG_SET(e_next, E_ISDELETE);
}
if (v_next->user_flag & V_ISISECT) {
inside = !inside;
}
/* now step... */
v_prev = v_curr;
v_curr = v_next;
e_curr = e_next;
e_next = edge_step(poly_info, poly_nr, v_prev, v_curr, e_curr);
} while (e_curr != e_init);
}
return true;
}
