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-rw-r--r--sql/gcalc_slicescan.cc2011
1 files changed, 2011 insertions, 0 deletions
diff --git a/sql/gcalc_slicescan.cc b/sql/gcalc_slicescan.cc
new file mode 100644
index 00000000..93561f5f
--- /dev/null
+++ b/sql/gcalc_slicescan.cc
@@ -0,0 +1,2011 @@
+/* Copyright (c) 2000, 2010 Oracle and/or its affiliates. All rights reserved.
+ Copyright (C) 2011 Monty Program Ab.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; version 2 of the License.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
+
+
+#include "mariadb.h"
+#include <my_sys.h>
+#include <m_string.h>
+
+#ifdef HAVE_SPATIAL
+
+#include "gcalc_slicescan.h"
+
+
+#define PH_DATA_OFFSET 8
+#define coord_to_float(d) ((double) d)
+#define coord_eq(a, b) (a == b)
+
+typedef int (*sc_compare_func)(const void*, const void*);
+
+#define LS_LIST_ITEM Gcalc_dyn_list::Item
+#define LS_COMPARE_FUNC_DECL sc_compare_func compare,
+#define LS_COMPARE_FUNC_CALL(list_el1, list_el2) (*compare)(list_el1, list_el2)
+#define LS_NEXT(A) (A)->next
+#define LS_SET_NEXT(A,val) (A)->next= val
+#define LS_P_NEXT(A) &(A)->next
+#define LS_NAME sort_list
+#define LS_SCOPE static
+#define LS_STRUCT_NAME sort_list_stack_struct
+#include "plistsort.c"
+
+
+#define GCALC_COORD_MINUS 0x80000000
+#define FIRST_DIGIT(d) ((d) & 0x7FFFFFFF)
+#define GCALC_SIGN(d) ((d) & 0x80000000)
+
+static Gcalc_scan_iterator::point *eq_sp(const Gcalc_heap::Info *pi)
+{
+ GCALC_DBUG_ASSERT(pi->type == Gcalc_heap::nt_eq_node);
+ return (Gcalc_scan_iterator::point *) pi->node.eq.data;
+}
+
+
+static Gcalc_scan_iterator::intersection_info *i_data(const Gcalc_heap::Info *pi)
+{
+ GCALC_DBUG_ASSERT(pi->type == Gcalc_heap::nt_intersection);
+ return (Gcalc_scan_iterator::intersection_info *) pi->node.intersection.data;
+}
+
+
+#ifndef GCALC_DBUG_OFF
+
+int gcalc_step_counter= 0;
+
+void GCALC_DBUG_CHECK_COUNTER()
+{
+ if (++gcalc_step_counter == 0)
+ GCALC_DBUG_PRINT(("step_counter_0"));
+ else
+ GCALC_DBUG_PRINT(("%d step_counter", gcalc_step_counter));
+}
+
+
+const char *gcalc_ev_name(int ev)
+{
+ switch (ev)
+ {
+ case scev_none:
+ return "n";
+ case scev_thread:
+ return "t";
+ case scev_two_threads:
+ return "tt";
+ case scev_end:
+ return "e";
+ case scev_two_ends:
+ return "ee";
+ case scev_intersection:
+ return "i";
+ case scev_point:
+ return "p";
+ case scev_single_point:
+ return "sp";
+ default:;
+ };
+ GCALC_DBUG_ASSERT(0);
+ return "unk";
+}
+
+
+static int gcalc_pi_str(char *str, const Gcalc_heap::Info *pi, const char *postfix)
+{
+ return sprintf(str, "%s %d %d | %s %d %d%s",
+ GCALC_SIGN(pi->node.shape.ix[0]) ? "-":"", FIRST_DIGIT(pi->node.shape.ix[0]),pi->node.shape.ix[1],
+ GCALC_SIGN(pi->node.shape.iy[0]) ? "-":"", FIRST_DIGIT(pi->node.shape.iy[0]),pi->node.shape.iy[1],
+ postfix);
+
+}
+
+
+static void GCALC_DBUG_PRINT_PI(const Gcalc_heap::Info *pi)
+{
+ char buf[128];
+ int n_buf;
+ if (pi->type == Gcalc_heap::nt_intersection)
+ {
+ const Gcalc_scan_iterator::intersection_info *ic= i_data(pi);
+
+ GCALC_DBUG_PRINT(("intersection point %d %d",
+ ic->edge_a->thread, ic->edge_b->thread));
+ return;
+ }
+ if (pi->type == Gcalc_heap::nt_eq_node)
+ {
+ const Gcalc_scan_iterator::point *e= eq_sp(pi);
+ GCALC_DBUG_PRINT(("eq point %d", e->thread));
+ return;
+ }
+ n_buf= gcalc_pi_str(buf, pi, "");
+ buf[n_buf]= 0;
+ GCALC_DBUG_PRINT(("%s", buf));
+}
+
+
+static void GCALC_DBUG_PRINT_SLICE(const char *header,
+ const Gcalc_scan_iterator::point *slice)
+{
+ size_t nbuf;
+ char buf[1024];
+ nbuf= strlen(header);
+ strcpy(buf, header);
+ for (; slice; slice= slice->get_next())
+ {
+ size_t lnbuf= nbuf;
+ lnbuf+= sprintf(buf + lnbuf, "%d\t", slice->thread);
+ lnbuf+= sprintf(buf + lnbuf, "%s\t", gcalc_ev_name(slice->event));
+
+ lnbuf+= gcalc_pi_str(buf + lnbuf, slice->pi, "\t");
+ if (slice->is_bottom())
+ lnbuf+= sprintf(buf+lnbuf, "bt\t");
+ else
+ lnbuf+= gcalc_pi_str(buf+lnbuf, slice->next_pi, "\t");
+ buf[lnbuf]= 0;
+ GCALC_DBUG_PRINT(("%s", buf));
+ }
+}
+
+
+#else
+#define GCALC_DBUG_CHECK_COUNTER() do { } while(0)
+#define GCALC_DBUG_PRINT_PI(pi) do { } while(0)
+#define GCALC_DBUG_PRINT_SLICE(a, b) do { } while(0)
+#define GCALC_DBUG_PRINT_INTERSECTIONS(a) do { } while(0)
+#define GCALC_DBUG_PRINT_STATE(a) do { } while(0)
+#endif /*GCALC_DBUG_OFF*/
+
+
+Gcalc_dyn_list::Gcalc_dyn_list(size_t blk_size, size_t sizeof_item):
+ m_blk_size(blk_size - ALLOC_ROOT_MIN_BLOCK_SIZE),
+ m_sizeof_item(ALIGN_SIZE(sizeof_item)),
+ m_points_per_blk((uint)((m_blk_size - PH_DATA_OFFSET) / m_sizeof_item)),
+ m_blk_hook(&m_first_blk),
+ m_free(NULL),
+ m_keep(NULL)
+{}
+
+
+Gcalc_dyn_list::Gcalc_dyn_list(const Gcalc_dyn_list &dl)
+{
+ m_blk_size= dl.m_blk_size;
+ m_sizeof_item= dl.m_sizeof_item;
+ m_points_per_blk= dl.m_points_per_blk;
+ m_blk_hook= &m_first_blk;
+ m_free= NULL;
+ m_keep= NULL;
+}
+
+
+void Gcalc_dyn_list::format_blk(void* block)
+{
+ Item *pi_end, *cur_pi, *first_pi;
+ GCALC_DBUG_ASSERT(m_free == NULL);
+ first_pi= cur_pi= (Item *)(((char *)block) + PH_DATA_OFFSET);
+ pi_end= ptr_add(first_pi, m_points_per_blk - 1);
+ do {
+ cur_pi= cur_pi->next= ptr_add(cur_pi, 1);
+ } while (cur_pi<pi_end);
+ cur_pi->next= m_free;
+ m_free= first_pi;
+}
+
+
+Gcalc_dyn_list::Item *Gcalc_dyn_list::alloc_new_blk()
+{
+ void *new_block= my_malloc(PSI_INSTRUMENT_ME, m_blk_size, MYF(MY_WME));
+ if (!new_block)
+ return NULL;
+ *m_blk_hook= new_block;
+ m_blk_hook= (void**)new_block;
+ format_blk(new_block);
+ return new_item();
+}
+
+
+static void free_blk_list(void *list)
+{
+ void *next_blk;
+ while (list)
+ {
+ next_blk= *((void **)list);
+ my_free(list);
+ list= next_blk;
+ }
+}
+
+
+void Gcalc_dyn_list::cleanup()
+{
+ *m_blk_hook= NULL;
+ free_blk_list(m_first_blk);
+ m_first_blk= NULL;
+ m_blk_hook= &m_first_blk;
+ m_free= NULL;
+}
+
+
+Gcalc_dyn_list::~Gcalc_dyn_list()
+{
+ cleanup();
+}
+
+
+void Gcalc_dyn_list::reset()
+{
+ *m_blk_hook= NULL;
+ if (m_first_blk)
+ {
+ free_blk_list(*((void **)m_first_blk));
+ m_blk_hook= (void**)m_first_blk;
+ m_free= NULL;
+ format_blk(m_first_blk);
+ }
+}
+
+
+/* Internal coordinate operations implementations */
+
+void gcalc_set_zero(Gcalc_internal_coord *d, int d_len)
+{
+ do
+ {
+ d[--d_len]= 0;
+ } while (d_len);
+}
+
+
+int gcalc_is_zero(const Gcalc_internal_coord *d, int d_len)
+{
+ do
+ {
+ if (d[--d_len] != 0)
+ return 0;
+ } while (d_len);
+ return 1;
+}
+
+
+#ifdef GCALC_CHECK_WITH_FLOAT
+static double *gcalc_coord_extent= NULL;
+
+long double gcalc_get_double(const Gcalc_internal_coord *d, int d_len)
+{
+ int n= 1;
+ long double res= (long double) FIRST_DIGIT(d[0]);
+ do
+ {
+ res*= (long double) GCALC_DIG_BASE;
+ res+= (long double) d[n];
+ } while(++n < d_len);
+
+ n= 0;
+ do
+ {
+ if ((n & 1) && gcalc_coord_extent)
+ res/= *gcalc_coord_extent;
+ } while(++n < d_len);
+
+ if (GCALC_SIGN(d[0]))
+ res*= -1.0;
+ return res;
+}
+#endif /*GCALC_CHECK_WITH_FLOAT*/
+
+
+static void do_add(Gcalc_internal_coord *result, int result_len,
+ const Gcalc_internal_coord *a,
+ const Gcalc_internal_coord *b)
+{
+ int n_digit= result_len-1;
+ gcalc_digit_t carry= 0;
+
+ do
+ {
+ if ((result[n_digit]=
+ a[n_digit] + b[n_digit] + carry) >= GCALC_DIG_BASE)
+ {
+ carry= 1;
+ result[n_digit]-= GCALC_DIG_BASE;
+ }
+ else
+ carry= 0;
+ } while (--n_digit);
+
+ result[0]= (a[0] + FIRST_DIGIT(b[0]) + carry);
+
+ GCALC_DBUG_ASSERT(FIRST_DIGIT(result[0]) < GCALC_DIG_BASE);
+}
+
+
+static void do_sub(Gcalc_internal_coord *result, int result_len,
+ const Gcalc_internal_coord *a,
+ const Gcalc_internal_coord *b)
+{
+ int n_digit= result_len-1;
+ gcalc_digit_t carry= 0;
+ gcalc_digit_t cur_b, cur_a;
+
+ do
+ {
+ cur_b= b[n_digit] + carry;
+ cur_a= a[n_digit];
+ if (cur_a < cur_b)
+ {
+ carry= 1;
+ result[n_digit]= (GCALC_DIG_BASE - cur_b) + cur_a;
+ }
+ else
+ {
+ carry= 0;
+ result[n_digit]= cur_a - cur_b;
+ }
+ } while (--n_digit);
+
+
+ result[0]= a[0] - FIRST_DIGIT(b[0]) - carry;
+
+ GCALC_DBUG_ASSERT(FIRST_DIGIT(a[0]) >= FIRST_DIGIT(b[0]) + carry);
+ GCALC_DBUG_ASSERT(!gcalc_is_zero(result, result_len));
+}
+/*
+static void do_sub(Gcalc_internal_coord *result, int result_len,
+ const Gcalc_internal_coord *a,
+ const Gcalc_internal_coord *b)
+{
+ int n_digit= result_len-1;
+ gcalc_digit_t carry= 0;
+
+ do
+ {
+ if ((result[n_digit]= a[n_digit] - b[n_digit] - carry) < 0)
+ {
+ carry= 1;
+ result[n_digit]+= GCALC_DIG_BASE;
+ }
+ else
+ carry= 0;
+ } while (--n_digit);
+
+
+ result[0]= a[0] - FIRST_DIGIT(b[0]) - carry;
+
+ GCALC_DBUG_ASSERT(FIRST_DIGIT(a[0]) - FIRST_DIGIT(b[0]) - carry >= 0);
+ GCALC_DBUG_ASSERT(!gcalc_is_zero(result, result_len));
+}
+*/
+
+static int do_cmp(const Gcalc_internal_coord *a,
+ const Gcalc_internal_coord *b, int len)
+{
+ int n_digit= 1;
+
+ if ((FIRST_DIGIT(a[0]) != FIRST_DIGIT(b[0])))
+ return FIRST_DIGIT(a[0]) > FIRST_DIGIT(b[0]) ? 1 : -1;
+
+ do
+ {
+ if ((a[n_digit] != b[n_digit]))
+ return a[n_digit] > b[n_digit] ? 1 : -1;
+ } while (++n_digit < len);
+
+ return 0;
+}
+
+
+#ifdef GCALC_CHECK_WITH_FLOAT
+static int de_weak_check(long double a, long double b, long double ex)
+{
+ long double d= a - b;
+ if (d < ex && d > -ex)
+ return 1;
+
+ d/= fabsl(a) + fabsl(b);
+ if (d < ex && d > -ex)
+ return 1;
+ return 0;
+}
+
+static int de_check(long double a, long double b)
+{
+ return de_weak_check(a, b, (long double) 1e-9);
+}
+#endif /*GCALC_CHECK_WITH_FLOAT*/
+
+
+void gcalc_mul_coord(Gcalc_internal_coord *result, int result_len,
+ const Gcalc_internal_coord *a, int a_len,
+ const Gcalc_internal_coord *b, int b_len)
+{
+ GCALC_DBUG_ASSERT(result_len == a_len + b_len);
+ GCALC_DBUG_ASSERT(a_len >= b_len);
+ int n_a, n_b, n_res;
+ gcalc_digit_t carry= 0;
+
+ gcalc_set_zero(result, result_len);
+
+ n_a= a_len - 1;
+ do
+ {
+ gcalc_coord2 cur_a= n_a ? a[n_a] : FIRST_DIGIT(a[0]);
+ n_b= b_len - 1;
+ do
+ {
+ gcalc_coord2 cur_b= n_b ? b[n_b] : FIRST_DIGIT(b[0]);
+ gcalc_coord2 mul= cur_a * cur_b + carry + result[n_a + n_b + 1];
+ result[n_a + n_b + 1]= mul % GCALC_DIG_BASE;
+ carry= (gcalc_digit_t) (mul / (gcalc_coord2) GCALC_DIG_BASE);
+ } while (n_b--);
+ if (carry)
+ {
+ for (n_res= n_a; (result[n_res]+= carry) >= GCALC_DIG_BASE;
+ n_res--)
+ {
+ result[n_res]-= GCALC_DIG_BASE;
+ carry= 1;
+ }
+ carry= 0;
+ }
+ } while (n_a--);
+ if (!gcalc_is_zero(result, result_len))
+ result[0]|= GCALC_SIGN(a[0] ^ b[0]);
+#ifdef GCALC_CHECK_WITH_FLOAT
+ GCALC_DBUG_ASSERT(de_check(gcalc_get_double(a, a_len) *
+ gcalc_get_double(b, b_len),
+ gcalc_get_double(result, result_len)));
+#endif /*GCALC_CHECK_WITH_FLOAT*/
+}
+
+
+inline void gcalc_mul_coord1(Gcalc_coord1 result,
+ const Gcalc_coord1 a, const Gcalc_coord1 b)
+{
+ return gcalc_mul_coord(result, GCALC_COORD_BASE2,
+ a, GCALC_COORD_BASE, b, GCALC_COORD_BASE);
+}
+
+
+void gcalc_add_coord(Gcalc_internal_coord *result, int result_len,
+ const Gcalc_internal_coord *a,
+ const Gcalc_internal_coord *b)
+{
+ if (GCALC_SIGN(a[0]) == GCALC_SIGN(b[0]))
+ do_add(result, result_len, a, b);
+ else
+ {
+ int cmp_res= do_cmp(a, b, result_len);
+ if (cmp_res == 0)
+ gcalc_set_zero(result, result_len);
+ else if (cmp_res > 0)
+ do_sub(result, result_len, a, b);
+ else
+ do_sub(result, result_len, b, a);
+ }
+#ifdef GCALC_CHECK_WITH_FLOAT
+ GCALC_DBUG_ASSERT(de_check(gcalc_get_double(a, result_len) +
+ gcalc_get_double(b, result_len),
+ gcalc_get_double(result, result_len)));
+#endif /*GCALC_CHECK_WITH_FLOAT*/
+}
+
+
+void gcalc_sub_coord(Gcalc_internal_coord *result, int result_len,
+ const Gcalc_internal_coord *a,
+ const Gcalc_internal_coord *b)
+{
+ if (GCALC_SIGN(a[0] ^ b[0]))
+ do_add(result, result_len, a, b);
+ else
+ {
+ int cmp_res= do_cmp(a, b, result_len);
+ if (cmp_res == 0)
+ gcalc_set_zero(result, result_len);
+ else if (cmp_res > 0)
+ do_sub(result, result_len, a, b);
+ else
+ {
+ do_sub(result, result_len, b, a);
+ result[0]^= GCALC_COORD_MINUS;
+ }
+ }
+#ifdef GCALC_CHECK_WITH_FLOAT
+ GCALC_DBUG_ASSERT(de_check(gcalc_get_double(a, result_len) -
+ gcalc_get_double(b, result_len),
+ gcalc_get_double(result, result_len)));
+#endif /*GCALC_CHECK_WITH_FLOAT*/
+}
+
+
+inline void gcalc_sub_coord1(Gcalc_coord1 result,
+ const Gcalc_coord1 a, const Gcalc_coord1 b)
+{
+ return gcalc_sub_coord(result, GCALC_COORD_BASE, a, b);
+}
+
+
+int gcalc_cmp_coord(const Gcalc_internal_coord *a,
+ const Gcalc_internal_coord *b, int len)
+{
+ int n_digit= 0;
+ int result= 0;
+
+ do
+ {
+ if (a[n_digit] == b[n_digit])
+ {
+ n_digit++;
+ continue;
+ }
+ if (a[n_digit] > b[n_digit])
+ result= GCALC_SIGN(a[0]) ? -1 : 1;
+ else
+ result= GCALC_SIGN(b[0]) ? 1 : -1;
+ break;
+
+ } while (n_digit < len);
+
+#ifdef GCALC_CHECK_WITH_FLOAT
+ if (result == 0)
+ GCALC_DBUG_ASSERT(de_check(gcalc_get_double(a, len),
+ gcalc_get_double(b, len)));
+ else if (result == 1)
+ GCALC_DBUG_ASSERT(de_check(gcalc_get_double(a, len),
+ gcalc_get_double(b, len)) ||
+ gcalc_get_double(a, len) > gcalc_get_double(b, len));
+ else
+ GCALC_DBUG_ASSERT(de_check(gcalc_get_double(a, len),
+ gcalc_get_double(b, len)) ||
+ gcalc_get_double(a, len) < gcalc_get_double(b, len));
+#endif /*GCALC_CHECK_WITH_FLOAT*/
+ return result;
+}
+
+
+#define gcalc_cmp_coord1(a, b) gcalc_cmp_coord(a, b, GCALC_COORD_BASE)
+
+int gcalc_set_double(Gcalc_internal_coord *c, double d, double ext)
+{
+ int sign;
+ double ds= d * ext;
+ if ((sign= ds < 0))
+ ds= -ds;
+ c[0]= (gcalc_digit_t) (ds / (double) GCALC_DIG_BASE);
+ c[1]= (gcalc_digit_t) (ds - ((double) c[0]) * (double) GCALC_DIG_BASE);
+ if (c[1] >= GCALC_DIG_BASE)
+ {
+ c[1]= 0;
+ c[0]++;
+ }
+ if (sign && (c[0] | c[1]))
+ c[0]|= GCALC_COORD_MINUS;
+#ifdef GCALC_CHECK_WITH_FLOAT
+ GCALC_DBUG_ASSERT(de_check(d, gcalc_get_double(c, 2)));
+#endif /*GCALC_CHECK_WITH_FLOAT*/
+ return 0;
+}
+
+
+typedef gcalc_digit_t Gcalc_coord4[GCALC_COORD_BASE*4];
+typedef gcalc_digit_t Gcalc_coord5[GCALC_COORD_BASE*5];
+
+
+void Gcalc_scan_iterator::intersection_info::do_calc_t()
+{
+ Gcalc_coord1 a2_a1x, a2_a1y;
+ Gcalc_coord2 x1y2, x2y1;
+
+ gcalc_sub_coord1(a2_a1x, edge_b->pi->node.shape.ix, edge_a->pi->node.shape.ix);
+ gcalc_sub_coord1(a2_a1y, edge_b->pi->node.shape.iy, edge_a->pi->node.shape.iy);
+
+ GCALC_DBUG_ASSERT(!gcalc_is_zero(edge_a->dy, GCALC_COORD_BASE) ||
+ !gcalc_is_zero(edge_b->dy, GCALC_COORD_BASE));
+
+ gcalc_mul_coord1(x1y2, edge_a->dx, edge_b->dy);
+ gcalc_mul_coord1(x2y1, edge_a->dy, edge_b->dx);
+ gcalc_sub_coord(t_b, GCALC_COORD_BASE2, x1y2, x2y1);
+
+
+ gcalc_mul_coord1(x1y2, a2_a1x, edge_b->dy);
+ gcalc_mul_coord1(x2y1, a2_a1y, edge_b->dx);
+ gcalc_sub_coord(t_a, GCALC_COORD_BASE2, x1y2, x2y1);
+ t_calculated= 1;
+}
+
+
+void Gcalc_scan_iterator::intersection_info::do_calc_y()
+{
+ GCALC_DBUG_ASSERT(t_calculated);
+
+ Gcalc_coord3 a_tb, b_ta;
+
+ gcalc_mul_coord(a_tb, GCALC_COORD_BASE3,
+ t_b, GCALC_COORD_BASE2, edge_a->pi->node.shape.iy, GCALC_COORD_BASE);
+ gcalc_mul_coord(b_ta, GCALC_COORD_BASE3,
+ t_a, GCALC_COORD_BASE2, edge_a->dy, GCALC_COORD_BASE);
+
+ gcalc_add_coord(y_exp, GCALC_COORD_BASE3, a_tb, b_ta);
+ y_calculated= 1;
+}
+
+
+void Gcalc_scan_iterator::intersection_info::do_calc_x()
+{
+ GCALC_DBUG_ASSERT(t_calculated);
+
+ Gcalc_coord3 a_tb, b_ta;
+
+ gcalc_mul_coord(a_tb, GCALC_COORD_BASE3,
+ t_b, GCALC_COORD_BASE2, edge_a->pi->node.shape.ix, GCALC_COORD_BASE);
+ gcalc_mul_coord(b_ta, GCALC_COORD_BASE3,
+ t_a, GCALC_COORD_BASE2, edge_a->dx, GCALC_COORD_BASE);
+
+ gcalc_add_coord(x_exp, GCALC_COORD_BASE3, a_tb, b_ta);
+ x_calculated= 1;
+}
+
+
+static int cmp_node_isc(const Gcalc_heap::Info *node,
+ const Gcalc_heap::Info *isc)
+{
+ GCALC_DBUG_ASSERT(node->type == Gcalc_heap::nt_shape_node);
+ Gcalc_scan_iterator::intersection_info *inf= i_data(isc);
+ Gcalc_coord3 exp;
+ int result;
+
+ inf->calc_t();
+ inf->calc_y_exp();
+
+ gcalc_mul_coord(exp, GCALC_COORD_BASE3,
+ inf->t_b, GCALC_COORD_BASE2, node->node.shape.iy, GCALC_COORD_BASE);
+
+ result= gcalc_cmp_coord(exp, inf->y_exp, GCALC_COORD_BASE3);
+#ifdef GCALC_CHECK_WITH_FLOAT
+ long double int_x, int_y;
+ isc->calc_xy_ld(&int_x, &int_y);
+ if (result < 0)
+ {
+ if (!de_check(int_y, node->node.shape.y) && node->node.shape.y > int_y)
+ GCALC_DBUG_PRINT(("floatcheck cmp_nod_iscy %g < %LG", node->node.shape.y, int_y));
+ }
+ else if (result > 0)
+ {
+ if (!de_check(int_y, node->node.shape.y) && node->node.shape.y < int_y)
+ GCALC_DBUG_PRINT(("floatcheck cmp_nod_iscy %g > %LG", node->node.shape.y, int_y));
+ }
+ else
+ {
+ if (!de_check(int_y, node->node.shape.y))
+ GCALC_DBUG_PRINT(("floatcheck cmp_nod_iscy %g == %LG", node->node.shape.y, int_y));
+ }
+#endif /*GCALC_CHECK_WITH_FLOAT*/
+ if (result)
+ goto exit;
+
+
+ inf->calc_x_exp();
+ gcalc_mul_coord(exp, GCALC_COORD_BASE3,
+ inf->t_b, GCALC_COORD_BASE2, node->node.shape.ix, GCALC_COORD_BASE);
+
+ result= gcalc_cmp_coord(exp, inf->x_exp, GCALC_COORD_BASE3);
+#ifdef GCALC_CHECK_WITH_FLOAT
+ if (result < 0)
+ {
+ if (!de_check(int_x, node->node.shape.x) && node->node.shape.x > int_x)
+ GCALC_DBUG_PRINT(("floatcheck cmp_nod_iscx failed %g < %LG",
+ node->node.shape.x, int_x));
+ }
+ else if (result > 0)
+ {
+ if (!de_check(int_x, node->node.shape.x) && node->node.shape.x < int_x)
+ GCALC_DBUG_PRINT(("floatcheck cmp_nod_iscx failed %g > %LG",
+ node->node.shape.x, int_x));
+ }
+ else
+ {
+ if (!de_check(int_x, node->node.shape.x))
+ GCALC_DBUG_PRINT(("floatcheck cmp_nod_iscx failed %g == %LG",
+ node->node.shape.x, int_x));
+ }
+#endif /*GCALC_CHECK_WITH_FLOAT*/
+exit:
+ return result;
+}
+
+
+static int cmp_intersections(const Gcalc_heap::Info *i1,
+ const Gcalc_heap::Info *i2)
+{
+ Gcalc_scan_iterator::intersection_info *inf1= i_data(i1);
+ Gcalc_scan_iterator::intersection_info *inf2= i_data(i2);
+ Gcalc_coord5 exp_a, exp_b;
+ int result;
+
+ inf1->calc_t();
+ inf2->calc_t();
+
+ inf1->calc_y_exp();
+ inf2->calc_y_exp();
+
+ gcalc_mul_coord(exp_a, GCALC_COORD_BASE5,
+ inf1->y_exp, GCALC_COORD_BASE3, inf2->t_b, GCALC_COORD_BASE2);
+ gcalc_mul_coord(exp_b, GCALC_COORD_BASE5,
+ inf2->y_exp, GCALC_COORD_BASE3, inf1->t_b, GCALC_COORD_BASE2);
+
+ result= gcalc_cmp_coord(exp_a, exp_b, GCALC_COORD_BASE5);
+#ifdef GCALC_CHECK_WITH_FLOAT
+ long double x1, y1, x2, y2;
+ i1->calc_xy_ld(&x1, &y1);
+ i2->calc_xy_ld(&x2, &y2);
+
+ if (result < 0)
+ {
+ if (!de_check(y1, y2) && y2 > y1)
+ GCALC_DBUG_PRINT(("floatcheck cmp_intersections_y failed %LG < %LG",
+ y2, y1));
+ }
+ else if (result > 0)
+ {
+ if (!de_check(y1, y2) && y2 < y1)
+ GCALC_DBUG_PRINT(("floatcheck cmp_intersections_y failed %LG > %LG",
+ y2, y1));
+ }
+ else
+ {
+ if (!de_check(y1, y2))
+ GCALC_DBUG_PRINT(("floatcheck cmp_intersections_y failed %LG == %LG",
+ y2, y1));
+ }
+#endif /*GCALC_CHECK_WITH_FLOAT*/
+
+ if (result != 0)
+ return result;
+
+
+ inf1->calc_x_exp();
+ inf2->calc_x_exp();
+ gcalc_mul_coord(exp_a, GCALC_COORD_BASE5,
+ inf1->x_exp, GCALC_COORD_BASE3, inf2->t_b, GCALC_COORD_BASE2);
+ gcalc_mul_coord(exp_b, GCALC_COORD_BASE5,
+ inf2->x_exp, GCALC_COORD_BASE3, inf1->t_b, GCALC_COORD_BASE2);
+
+ result= gcalc_cmp_coord(exp_a, exp_b, GCALC_COORD_BASE5);
+#ifdef GCALC_CHECK_WITH_FLOAT
+ if (result < 0)
+ {
+ if (!de_check(x1, x2) && x2 > x1)
+ GCALC_DBUG_PRINT(("floatcheck cmp_intersectionsx failed %LG < %LG",
+ x2, x1));
+ }
+ else if (result > 0)
+ {
+ if (!de_check(x1, x2) && x2 < x1)
+ GCALC_DBUG_PRINT(("floatcheck cmp_intersectionsx failed %LG > %LG",
+ x2, x1));
+ }
+ else
+ {
+ if (!de_check(x1, x2))
+ GCALC_DBUG_PRINT(("floatcheck cmp_intersectionsx failed %LG == %LG",
+ x2, x1));
+ }
+#endif /*GCALC_CHECK_WITH_FLOAT*/
+ return result;
+}
+/* Internal coordinates implementation end */
+
+
+#define GCALC_SCALE_1 1e18
+
+static double find_scale(double extent)
+{
+ double scale= 1e-2;
+ while (scale < extent)
+ scale*= (double ) 10;
+ return GCALC_SCALE_1 / scale / 10;
+}
+
+
+void Gcalc_heap::set_extent(double xmin, double xmax, double ymin, double ymax)
+{
+ xmin= fabs(xmin);
+ xmax= fabs(xmax);
+ ymin= fabs(ymin);
+ ymax= fabs(ymax);
+
+ if (xmax < xmin)
+ xmax= xmin;
+ if (ymax < ymin)
+ ymax= ymin;
+
+ coord_extent= xmax > ymax ? xmax : ymax;
+ coord_extent= find_scale(coord_extent);
+#ifdef GCALC_CHECK_WITH_FLOAT
+ gcalc_coord_extent= &coord_extent;
+#endif /*GCALC_CHECK_WITH_FLOAT*/
+}
+
+
+void Gcalc_heap::free_point_info(Gcalc_heap::Info *i,
+ Gcalc_dyn_list::Item **i_hook)
+{
+ if (m_hook == &i->next)
+ m_hook= i_hook;
+ *i_hook= i->next;
+ free_item(i);
+ m_n_points--;
+}
+
+
+Gcalc_heap::Info *Gcalc_heap::new_point_info(double x, double y,
+ gcalc_shape_info shape)
+{
+ Info *result= (Info *)new_item();
+ if (!result)
+ return NULL;
+ *m_hook= result;
+ m_hook= &result->next;
+ result->node.shape.x= x;
+ result->node.shape.y= y;
+ result->node.shape.shape= shape;
+ result->node.shape.top_node= 1;
+ result->type= nt_shape_node;
+ gcalc_set_double(result->node.shape.ix, x, coord_extent);
+ gcalc_set_double(result->node.shape.iy, y, coord_extent);
+
+ m_n_points++;
+ return result;
+}
+
+
+static Gcalc_heap::Info *new_intersection(
+ Gcalc_heap *heap, Gcalc_scan_iterator::intersection_info *ii)
+{
+ Gcalc_heap::Info *isc= (Gcalc_heap::Info *)heap->new_item();
+ if (!isc)
+ return 0;
+ isc->type= Gcalc_heap::nt_intersection;
+ isc->node.intersection.p1= ii->edge_a->pi;
+ isc->node.intersection.p2= ii->edge_a->next_pi;
+ isc->node.intersection.p3= ii->edge_b->pi;
+ isc->node.intersection.p4= ii->edge_b->next_pi;
+ isc->node.intersection.data= ii;
+ return isc;
+}
+
+
+static Gcalc_heap::Info *new_eq_point(
+ Gcalc_heap *heap, const Gcalc_heap::Info *p,
+ Gcalc_scan_iterator::point *edge)
+{
+ Gcalc_heap::Info *eqp= (Gcalc_heap::Info *)heap->new_item();
+ if (!eqp)
+ return 0;
+ eqp->type= Gcalc_heap::nt_eq_node;
+ eqp->node.eq.node= p;
+ eqp->node.eq.data= edge;
+ return eqp;
+}
+
+
+void Gcalc_heap::Info::calc_xy(double *x, double *y) const
+{
+ double b0_x= node.intersection.p2->node.shape.x - node.intersection.p1->node.shape.x;
+ double b0_y= node.intersection.p2->node.shape.y - node.intersection.p1->node.shape.y;
+ double b1_x= node.intersection.p4->node.shape.x - node.intersection.p3->node.shape.x;
+ double b1_y= node.intersection.p4->node.shape.y - node.intersection.p3->node.shape.y;
+ double b0xb1= b0_x * b1_y - b0_y * b1_x;
+ double t= (node.intersection.p3->node.shape.x - node.intersection.p1->node.shape.x) * b1_y - (node.intersection.p3->node.shape.y - node.intersection.p1->node.shape.y) * b1_x;
+
+ t/= b0xb1;
+
+ *x= node.intersection.p1->node.shape.x + b0_x * t;
+ *y= node.intersection.p1->node.shape.y + b0_y * t;
+}
+
+
+#ifdef GCALC_CHECK_WITH_FLOAT
+void Gcalc_heap::Info::calc_xy_ld(long double *x, long double *y) const
+{
+ long double b0_x= ((long double) p2->node.shape.x) - p1->node.shape.x;
+ long double b0_y= ((long double) p2->node.shape.y) - p1->node.shape.y;
+ long double b1_x= ((long double) p4->node.shape.x) - p3->node.shape.x;
+ long double b1_y= ((long double) p4->node.shape.y) - p3->node.shape.y;
+ long double b0xb1= b0_x * b1_y - b0_y * b1_x;
+ long double ax= ((long double) p3->node.shape.x) - p1->node.shape.x;
+ long double ay= ((long double) p3->node.shape.y) - p1->node.shape.y;
+ long double t_a= ax * b1_y - ay * b1_x;
+ long double hx= (b0xb1 * (long double) p1->node.shape.x + b0_x * t_a);
+ long double hy= (b0xb1 * (long double) p1->node.shape.y + b0_y * t_a);
+
+ if (fabs(b0xb1) < 1e-15)
+ {
+ *x= p1->node.shape.x;
+ *y= p1->node.shape.y;
+ return;
+ }
+
+ *x= hx/b0xb1;
+ *y= hy/b0xb1;
+}
+#endif /*GCALC_CHECK_WITH_FLOAT*/
+
+
+static int cmp_point_info(const Gcalc_heap::Info *i0,
+ const Gcalc_heap::Info *i1)
+{
+ int cmp_y= gcalc_cmp_coord1(i0->node.shape.iy, i1->node.shape.iy);
+ if (cmp_y)
+ return cmp_y;
+ return gcalc_cmp_coord1(i0->node.shape.ix, i1->node.shape.ix);
+}
+
+
+static inline void trim_node(Gcalc_heap::Info *node, Gcalc_heap::Info *prev_node)
+{
+ if (!node)
+ return;
+ node->node.shape.top_node= 0;
+ GCALC_DBUG_ASSERT((node->node.shape.left == prev_node) || (node->node.shape.right == prev_node));
+ if (node->node.shape.left == prev_node)
+ node->node.shape.left= node->node.shape.right;
+ node->node.shape.right= NULL;
+ GCALC_DBUG_ASSERT(cmp_point_info(node, prev_node));
+}
+
+
+static int compare_point_info(const void *e0, const void *e1)
+{
+ const Gcalc_heap::Info *i0= (const Gcalc_heap::Info *)e0;
+ const Gcalc_heap::Info *i1= (const Gcalc_heap::Info *)e1;
+ return cmp_point_info(i0, i1) > 0;
+}
+
+
+void Gcalc_heap::prepare_operation()
+{
+ Info *cur;
+ GCALC_DBUG_ASSERT(m_hook);
+ *m_hook= NULL;
+ m_hook= NULL; /* just to check it's not called twice */
+ m_first= sort_list(compare_point_info, m_first, m_n_points);
+
+ /* TODO - move this to the 'normal_scan' loop */
+ for (cur= get_first(); cur; cur= cur->get_next())
+ {
+ trim_node(cur->node.shape.left, cur);
+ trim_node(cur->node.shape.right, cur);
+ }
+}
+
+
+void Gcalc_heap::reset()
+{
+ if (m_n_points)
+ {
+ if (m_hook)
+ *m_hook= NULL;
+ free_list(m_first);
+ m_n_points= 0;
+ }
+ m_hook= &m_first;
+}
+
+
+int Gcalc_shape_transporter::int_single_point(gcalc_shape_info Info,
+ double x, double y)
+{
+ Gcalc_heap::Info *point= m_heap->new_point_info(x, y, Info);
+ if (!point)
+ return 1;
+ point->node.shape.left= point->node.shape.right= 0;
+ return 0;
+}
+
+
+int Gcalc_shape_transporter::int_add_point(gcalc_shape_info Info,
+ double x, double y)
+{
+ Gcalc_heap::Info *point;
+ Gcalc_dyn_list::Item **hook;
+
+ hook= m_heap->get_cur_hook();
+
+ if (!(point= m_heap->new_point_info(x, y, Info)))
+ return 1;
+ if (m_first)
+ {
+ if (cmp_point_info(m_prev, point) == 0)
+ {
+ /* Coinciding points, do nothing */
+ m_heap->free_point_info(point, hook);
+ return 0;
+ }
+ GCALC_DBUG_ASSERT(!m_prev || m_prev->node.shape.x != x || m_prev->node.shape.y != y);
+ m_prev->node.shape.left= point;
+ point->node.shape.right= m_prev;
+ }
+ else
+ m_first= point;
+ m_prev= point;
+ m_prev_hook= hook;
+ return 0;
+}
+
+
+void Gcalc_shape_transporter::int_complete()
+{
+ GCALC_DBUG_ASSERT(m_shape_started == 1 || m_shape_started == 3);
+
+ if (!m_first)
+ return;
+
+ /* simple point */
+ if (m_first == m_prev)
+ {
+ m_first->node.shape.right= m_first->node.shape.left= NULL;
+ return;
+ }
+
+ /* line */
+ if (m_shape_started == 1)
+ {
+ m_first->node.shape.right= NULL;
+ m_prev->node.shape.left= m_prev->node.shape.right;
+ m_prev->node.shape.right= NULL;
+ return;
+ }
+
+ /* polygon */
+ if (cmp_point_info(m_first, m_prev) == 0)
+ {
+ /* Coinciding points, remove the last one from the list */
+ m_prev->node.shape.right->node.shape.left= m_first;
+ m_first->node.shape.right= m_prev->node.shape.right;
+ m_heap->free_point_info(m_prev, m_prev_hook);
+ }
+ else
+ {
+ GCALC_DBUG_ASSERT(m_prev->node.shape.x != m_first->node.shape.x || m_prev->node.shape.y != m_first->node.shape.y);
+ m_first->node.shape.right= m_prev;
+ m_prev->node.shape.left= m_first;
+ }
+}
+
+
+inline void calc_dx_dy(Gcalc_scan_iterator::point *p)
+{
+ gcalc_sub_coord1(p->dx, p->next_pi->node.shape.ix, p->pi->node.shape.ix);
+ gcalc_sub_coord1(p->dy, p->next_pi->node.shape.iy, p->pi->node.shape.iy);
+ if (GCALC_SIGN(p->dx[0]))
+ {
+ p->l_border= &p->next_pi->node.shape.ix;
+ p->r_border= &p->pi->node.shape.ix;
+ }
+ else
+ {
+ p->r_border= &p->next_pi->node.shape.ix;
+ p->l_border= &p->pi->node.shape.ix;
+ }
+}
+
+
+Gcalc_scan_iterator::Gcalc_scan_iterator(size_t blk_size) :
+ Gcalc_dyn_list(blk_size, sizeof(point) > sizeof(intersection_info) ?
+ sizeof(point) :
+ sizeof(intersection_info))
+{
+ state.slice= NULL;
+ m_bottom_points= NULL;
+ m_bottom_hook= &m_bottom_points;
+}
+
+
+void Gcalc_scan_iterator::init(Gcalc_heap *points)
+{
+ GCALC_DBUG_ASSERT(points->ready());
+ GCALC_DBUG_ASSERT(!state.slice);
+
+ if (!(m_cur_pi= points->get_first()))
+ return;
+ m_heap= points;
+ state.event_position_hook= &state.slice;
+ state.event_end= NULL;
+#ifndef GCALC_DBUG_OFF
+ m_cur_thread= 0;
+#endif /*GCALC_DBUG_OFF*/
+ GCALC_SET_TERMINATED(killed, 0);
+}
+
+void Gcalc_scan_iterator::reset()
+{
+ state.slice= NULL;
+ m_bottom_points= NULL;
+ m_bottom_hook= &m_bottom_points;
+ Gcalc_dyn_list::reset();
+}
+
+
+int Gcalc_scan_iterator::point::cmp_dx_dy(const Gcalc_coord1 dx_a,
+ const Gcalc_coord1 dy_a,
+ const Gcalc_coord1 dx_b,
+ const Gcalc_coord1 dy_b)
+{
+ Gcalc_coord2 dx_a_dy_b;
+ Gcalc_coord2 dy_a_dx_b;
+ gcalc_mul_coord1(dx_a_dy_b, dx_a, dy_b);
+ gcalc_mul_coord1(dy_a_dx_b, dy_a, dx_b);
+
+ return gcalc_cmp_coord(dx_a_dy_b, dy_a_dx_b, GCALC_COORD_BASE2);
+}
+
+
+int Gcalc_scan_iterator::point::cmp_dx_dy(const Gcalc_heap::Info *p1,
+ const Gcalc_heap::Info *p2,
+ const Gcalc_heap::Info *p3,
+ const Gcalc_heap::Info *p4)
+{
+ Gcalc_coord1 dx_a, dy_a, dx_b, dy_b;
+ gcalc_sub_coord1(dx_a, p2->node.shape.ix, p1->node.shape.ix);
+ gcalc_sub_coord1(dy_a, p2->node.shape.iy, p1->node.shape.iy);
+ gcalc_sub_coord1(dx_b, p4->node.shape.ix, p3->node.shape.ix);
+ gcalc_sub_coord1(dy_b, p4->node.shape.iy, p3->node.shape.iy);
+ return cmp_dx_dy(dx_a, dy_a, dx_b, dy_b);
+}
+
+
+int Gcalc_scan_iterator::point::cmp_dx_dy(const point *p) const
+{
+ GCALC_DBUG_ASSERT(!is_bottom());
+ return cmp_dx_dy(dx, dy, p->dx, p->dy);
+}
+
+
+#ifdef GCALC_CHECK_WITH_FLOAT
+void Gcalc_scan_iterator::point::calc_x(long double *x, long double y,
+ long double ix) const
+{
+ long double ddy= gcalc_get_double(dy, GCALC_COORD_BASE);
+ if (fabsl(ddy) < (long double) 1e-20)
+ {
+ *x= ix;
+ }
+ else
+ *x= (ddy * (long double) pi->node.shape.x + gcalc_get_double(dx, GCALC_COORD_BASE) *
+ (y - pi->node.shape.y)) / ddy;
+}
+#endif /*GCALC_CHECK_WITH_FLOAT*/
+
+
+static int compare_events(const void *e0, const void *e1)
+{
+ const Gcalc_scan_iterator::point *p0= (const Gcalc_scan_iterator::point *)e0;
+ const Gcalc_scan_iterator::point *p1= (const Gcalc_scan_iterator::point *)e1;
+ return p0->cmp_dx_dy(p1) > 0;
+}
+
+
+int Gcalc_scan_iterator::arrange_event(int do_sorting, int n_intersections)
+{
+ int ev_counter;
+ point *sp;
+ point **sp_hook;
+
+ ev_counter= 0;
+
+ *m_bottom_hook= NULL;
+ for (sp= m_bottom_points; sp; sp= sp->get_next())
+ sp->ev_next= sp->get_next();
+
+ for (sp= state.slice, sp_hook= &state.slice;
+ sp; sp_hook= sp->next_ptr(), sp= sp->get_next())
+ {
+ if (sp->event)
+ {
+ state.event_position_hook= sp_hook;
+ break;
+ }
+ }
+
+ for (sp= *(sp_hook= state.event_position_hook);
+ sp && sp->event; sp_hook= sp->next_ptr(), sp= sp->get_next())
+ {
+ ev_counter++;
+ if (sp->get_next() && sp->get_next()->event)
+ sp->ev_next= sp->get_next();
+ else
+ sp->ev_next= m_bottom_points;
+ }
+
+#ifndef GCALC_DBUG_OFF
+ {
+ point *cur_p= sp;
+ for (; cur_p; cur_p= cur_p->get_next())
+ GCALC_DBUG_ASSERT(!cur_p->event);
+ }
+#endif /*GCALC_DBUG_OFF*/
+
+ state.event_end= sp;
+
+ if (ev_counter == 2 && n_intersections == 1)
+ {
+ /* If we had only intersection, just swap the two points. */
+ sp= *state.event_position_hook;
+ *state.event_position_hook= sp->get_next();
+ sp->next= (*state.event_position_hook)->next;
+ (*state.event_position_hook)->next= sp;
+
+ /* The list of the events should be restored. */
+ (*state.event_position_hook)->ev_next= sp;
+ sp->ev_next= m_bottom_points;
+ }
+ else if (ev_counter == 2 && get_events()->event == scev_two_threads)
+ {
+ /* Do nothing. */
+ }
+ else if (ev_counter > 1 && do_sorting)
+ {
+ point *cur_p;
+ *sp_hook= NULL;
+ sp= (point *) sort_list(compare_events, *state.event_position_hook,
+ ev_counter);
+ /* Find last item in the list, it's changed after the sorting. */
+ for (cur_p= sp->get_next(); cur_p->get_next();
+ cur_p= cur_p->get_next())
+ {}
+ cur_p->next= state.event_end;
+ *state.event_position_hook= sp;
+ /* The list of the events should be restored. */
+ for (; sp && sp->event; sp= sp->get_next())
+ {
+ if (sp->get_next() && sp->get_next()->event)
+ sp->ev_next= sp->get_next();
+ else
+ sp->ev_next= m_bottom_points;
+ }
+ }
+
+#ifndef GCALC_DBUG_OFF
+ {
+ const event_point *ev= get_events();
+ for (; ev && ev->get_next(); ev= ev->get_next())
+ {
+ if (ev->is_bottom() || ev->get_next()->is_bottom())
+ break;
+ GCALC_DBUG_ASSERT(ev->cmp_dx_dy(ev->get_next()) <= 0);
+ }
+ }
+#endif /*GCALC_DBUG_OFF*/
+ return 0;
+}
+
+
+int Gcalc_heap::Info::equal_pi(const Info *pi) const
+{
+ if (type == nt_intersection)
+ return node.intersection.equal;
+ if (pi->type == nt_eq_node)
+ return 1;
+ if (type == nt_eq_node || pi->type == nt_intersection)
+ return 0;
+ return cmp_point_info(this, pi) == 0;
+}
+
+int Gcalc_scan_iterator::step()
+{
+ int result= 0;
+ int do_sorting= 0;
+ int n_intersections= 0;
+ point *sp;
+ GCALC_DBUG_ENTER("Gcalc_scan_iterator::step");
+ GCALC_DBUG_ASSERT(more_points());
+
+ if (GCALC_TERMINATED(killed))
+ GCALC_DBUG_RETURN(0xFFFF);
+
+ /* Clear the old event marks. */
+ if (m_bottom_points)
+ {
+ free_list((Gcalc_dyn_list::Item **) &m_bottom_points,
+ (Gcalc_dyn_list::Item **) m_bottom_hook);
+ m_bottom_points= NULL;
+ m_bottom_hook= &m_bottom_points;
+ }
+ for (sp= *state.event_position_hook;
+ sp != state.event_end; sp= sp->get_next())
+ sp->event= scev_none;
+
+//#ifndef GCALC_DBUG_OFF
+ state.event_position_hook= NULL;
+ state.pi= NULL;
+//#endif /*GCALC_DBUG_OFF*/
+
+ do
+ {
+#ifndef GCALC_DBUG_OFF
+ if (m_cur_pi->type == Gcalc_heap::nt_intersection &&
+ m_cur_pi->get_next()->type == Gcalc_heap::nt_intersection &&
+ m_cur_pi->node.intersection.equal)
+ GCALC_DBUG_ASSERT(cmp_intersections(m_cur_pi, m_cur_pi->get_next()) == 0);
+#endif /*GCALC_DBUG_OFF*/
+ GCALC_DBUG_CHECK_COUNTER();
+ GCALC_DBUG_PRINT_SLICE("step:", state.slice);
+ GCALC_DBUG_PRINT_PI(m_cur_pi);
+ if (m_cur_pi->type == Gcalc_heap::nt_shape_node)
+ {
+ if (m_cur_pi->is_top())
+ {
+ result= insert_top_node();
+ if (!m_cur_pi->is_bottom())
+ do_sorting++;
+ }
+ else if (m_cur_pi->is_bottom())
+ remove_bottom_node();
+ else
+ {
+ do_sorting++;
+ result= node_scan();
+ }
+ if (result)
+ GCALC_DBUG_RETURN(result);
+ state.pi= m_cur_pi;
+ }
+ else if (m_cur_pi->type == Gcalc_heap::nt_eq_node)
+ {
+ do_sorting++;
+ eq_scan();
+ }
+ else
+ {
+ /* nt_intersection */
+ do_sorting++;
+ n_intersections++;
+ intersection_scan();
+ if (!state.pi || state.pi->type == Gcalc_heap::nt_intersection)
+ state.pi= m_cur_pi;
+ }
+
+ m_cur_pi= m_cur_pi->get_next();
+ } while (m_cur_pi && state.pi->equal_pi(m_cur_pi));
+
+ GCALC_DBUG_RETURN(arrange_event(do_sorting, n_intersections));
+}
+
+
+static int node_on_right(const Gcalc_heap::Info *node,
+ const Gcalc_heap::Info *edge_a, const Gcalc_heap::Info *edge_b)
+{
+ Gcalc_coord1 a_x, a_y;
+ Gcalc_coord1 b_x, b_y;
+ Gcalc_coord2 ax_by, ay_bx;
+ int result;
+
+ gcalc_sub_coord1(a_x, node->node.shape.ix, edge_a->node.shape.ix);
+ gcalc_sub_coord1(a_y, node->node.shape.iy, edge_a->node.shape.iy);
+ gcalc_sub_coord1(b_x, edge_b->node.shape.ix, edge_a->node.shape.ix);
+ gcalc_sub_coord1(b_y, edge_b->node.shape.iy, edge_a->node.shape.iy);
+ gcalc_mul_coord1(ax_by, a_x, b_y);
+ gcalc_mul_coord1(ay_bx, a_y, b_x);
+ result= gcalc_cmp_coord(ax_by, ay_bx, GCALC_COORD_BASE2);
+#ifdef GCALC_CHECK_WITH_FLOAT
+ {
+ long double dx= gcalc_get_double(edge_b->node.shape.ix, GCALC_COORD_BASE) -
+ gcalc_get_double(edge_a->node.shape.ix, GCALC_COORD_BASE);
+ long double dy= gcalc_get_double(edge_b->node.shape.iy, GCALC_COORD_BASE) -
+ gcalc_get_double(edge_a->node.shape.iy, GCALC_COORD_BASE);
+ long double ax= gcalc_get_double(node->node.shape.ix, GCALC_COORD_BASE) -
+ gcalc_get_double(edge_a->node.shape.ix, GCALC_COORD_BASE);
+ long double ay= gcalc_get_double(node->node.shape.iy, GCALC_COORD_BASE) -
+ gcalc_get_double(edge_a->node.shape.iy, GCALC_COORD_BASE);
+ long double d= ax * dy - ay * dx;
+ if (result == 0)
+ GCALC_DBUG_ASSERT(de_check(d, 0.0));
+ else if (result < 0)
+ GCALC_DBUG_ASSERT(de_check(d, 0.0) || d < 0);
+ else
+ GCALC_DBUG_ASSERT(de_check(d, 0.0) || d > 0);
+ }
+#endif /*GCALC_CHECK_WITH_FLOAT*/
+ return result;
+}
+
+
+static int cmp_tops(const Gcalc_heap::Info *top_node,
+ const Gcalc_heap::Info *edge_a, const Gcalc_heap::Info *edge_b)
+{
+ int cmp_res_a, cmp_res_b;
+
+ cmp_res_a= gcalc_cmp_coord1(edge_a->node.shape.ix, top_node->node.shape.ix);
+ cmp_res_b= gcalc_cmp_coord1(edge_b->node.shape.ix, top_node->node.shape.ix);
+
+ if (cmp_res_a <= 0 && cmp_res_b > 0)
+ return -1;
+ if (cmp_res_b <= 0 && cmp_res_a > 0)
+ return 1;
+ if (cmp_res_a == 0 && cmp_res_b == 0)
+ return 0;
+
+ return node_on_right(edge_a, top_node, edge_b);
+}
+
+
+int Gcalc_scan_iterator::insert_top_node()
+{
+ point *sp= state.slice;
+ point **prev_hook= &state.slice;
+ point *sp1= NULL;
+ point *sp0= new_slice_point();
+ int cmp_res;
+
+ GCALC_DBUG_ENTER("Gcalc_scan_iterator::insert_top_node");
+ if (!sp0)
+ GCALC_DBUG_RETURN(1);
+ sp0->pi= m_cur_pi;
+ sp0->next_pi= m_cur_pi->node.shape.left;
+#ifndef GCALC_DBUG_OFF
+ sp0->thread= m_cur_thread++;
+#endif /*GCALC_DBUG_OFF*/
+ if (m_cur_pi->node.shape.left)
+ {
+ calc_dx_dy(sp0);
+ if (m_cur_pi->node.shape.right)
+ {
+ if (!(sp1= new_slice_point()))
+ GCALC_DBUG_RETURN(1);
+ sp1->event= sp0->event= scev_two_threads;
+ sp1->pi= m_cur_pi;
+ sp1->next_pi= m_cur_pi->node.shape.right;
+#ifndef GCALC_DBUG_OFF
+ sp1->thread= m_cur_thread++;
+#endif /*GCALC_DBUG_OFF*/
+ calc_dx_dy(sp1);
+ /* We have two threads so should decide which one will be first */
+ cmp_res= cmp_tops(m_cur_pi, m_cur_pi->node.shape.left, m_cur_pi->node.shape.right);
+ if (cmp_res > 0)
+ {
+ point *tmp= sp0;
+ sp0= sp1;
+ sp1= tmp;
+ }
+ else if (cmp_res == 0)
+ {
+ /* Exactly same direction of the edges. */
+ cmp_res= gcalc_cmp_coord1(m_cur_pi->node.shape.left->node.shape.iy, m_cur_pi->node.shape.right->node.shape.iy);
+ if (cmp_res != 0)
+ {
+ if (cmp_res < 0)
+ {
+ if (add_eq_node(sp0->next_pi, sp1))
+ GCALC_DBUG_RETURN(1);
+ }
+ else
+ {
+ if (add_eq_node(sp1->next_pi, sp0))
+ GCALC_DBUG_RETURN(1);
+ }
+ }
+ else
+ {
+ cmp_res= gcalc_cmp_coord1(m_cur_pi->node.shape.left->node.shape.ix, m_cur_pi->node.shape.right->node.shape.ix);
+ if (cmp_res != 0)
+ {
+ if (cmp_res < 0)
+ {
+ if (add_eq_node(sp0->next_pi, sp1))
+ GCALC_DBUG_RETURN(1);
+ }
+ else
+ {
+ if (add_eq_node(sp1->next_pi, sp0))
+ GCALC_DBUG_RETURN(1);
+ }
+ }
+ }
+ }
+ }
+ else
+ sp0->event= scev_thread;
+ }
+ else
+ sp0->event= scev_single_point;
+
+
+ /* Check if we already have an event - then we'll place the node there */
+ for (; sp && !sp->event; prev_hook= sp->next_ptr(), sp=sp->get_next())
+ {}
+ if (!sp)
+ {
+ sp= state.slice;
+ prev_hook= &state.slice;
+ /* We need to find the place to insert. */
+ for (; sp; prev_hook= sp->next_ptr(), sp=sp->get_next())
+ {
+ if (sp->event || gcalc_cmp_coord1(*sp->r_border, m_cur_pi->node.shape.ix) < 0)
+ continue;
+ cmp_res= node_on_right(m_cur_pi, sp->pi, sp->next_pi);
+ if (cmp_res == 0)
+ {
+ /* The top node lies on the edge. */
+ /* Nodes of that edge will be handled in other places. */
+ sp->event= scev_intersection;
+ }
+ else if (cmp_res < 0)
+ break;
+ }
+ }
+
+ if (sp0->event == scev_single_point)
+ {
+ /* Add single point to the bottom list. */
+ *m_bottom_hook= sp0;
+ m_bottom_hook= sp0->next_ptr();
+ state.event_position_hook= prev_hook;
+ }
+ else
+ {
+ *prev_hook= sp0;
+ sp0->next= sp;
+ if (add_events_for_node(sp0))
+ GCALC_DBUG_RETURN(1);
+
+ if (sp0->event == scev_two_threads)
+ {
+ *prev_hook= sp1;
+ sp1->next= sp;
+ if (add_events_for_node(sp1))
+ GCALC_DBUG_RETURN(1);
+
+ sp0->next= sp1;
+ *prev_hook= sp0;
+ }
+ }
+
+ GCALC_DBUG_RETURN(0);
+}
+
+
+void Gcalc_scan_iterator::remove_bottom_node()
+{
+ point *sp= state.slice;
+ point **sp_hook= &state.slice;
+ point *first_bottom_point= NULL;
+
+ GCALC_DBUG_ENTER("Gcalc_scan_iterator::remove_bottom_node");
+ for (; sp; sp= sp->get_next())
+ {
+ if (sp->next_pi == m_cur_pi)
+ {
+ *sp_hook= sp->get_next();
+ sp->pi= m_cur_pi;
+ sp->next_pi= NULL;
+ if (first_bottom_point)
+ {
+ first_bottom_point->event= sp->event= scev_two_ends;
+ break;
+ }
+ first_bottom_point= sp;
+ sp->event= scev_end;
+ state.event_position_hook= sp_hook;
+ }
+ else
+ sp_hook= sp->next_ptr();
+ }
+ GCALC_DBUG_ASSERT(first_bottom_point);
+ *m_bottom_hook= first_bottom_point;
+ m_bottom_hook= first_bottom_point->next_ptr();
+ if (sp)
+ {
+ *m_bottom_hook= sp;
+ m_bottom_hook= sp->next_ptr();
+ }
+
+ GCALC_DBUG_VOID_RETURN;
+}
+
+
+int Gcalc_scan_iterator::add_events_for_node(point *sp_node)
+{
+ point *sp= state.slice;
+ int cur_pi_r, sp_pi_r;
+
+ GCALC_DBUG_ENTER("Gcalc_scan_iterator::add_events_for_node");
+
+ /* Scan to the event point. */
+ for (; sp != sp_node; sp= sp->get_next())
+ {
+ GCALC_DBUG_ASSERT(!sp->is_bottom());
+ GCALC_DBUG_PRINT(("left cut_edge %d", sp->thread));
+ if (sp->next_pi == sp_node->next_pi ||
+ gcalc_cmp_coord1(*sp->r_border, *sp_node->l_border) < 0)
+ continue;
+ sp_pi_r= node_on_right(sp->next_pi, sp_node->pi, sp_node->next_pi);
+ if (sp_pi_r < 0)
+ continue;
+ cur_pi_r= node_on_right(sp_node->next_pi, sp->pi, sp->next_pi);
+ if (cur_pi_r > 0)
+ continue;
+ if (cur_pi_r == 0 && sp_pi_r == 0)
+ {
+ int cmp_res= cmp_point_info(sp->next_pi, sp_node->next_pi);
+ if (cmp_res > 0)
+ {
+ if (add_eq_node(sp_node->next_pi, sp))
+ GCALC_DBUG_RETURN(1);
+ }
+ else if (cmp_res < 0)
+ {
+ if (add_eq_node(sp->next_pi, sp_node))
+ GCALC_DBUG_RETURN(1);
+ }
+ continue;
+ }
+
+ if (cur_pi_r == 0)
+ {
+ if (add_eq_node(sp_node->next_pi, sp))
+ GCALC_DBUG_RETURN(1);
+ continue;
+ }
+ else if (sp_pi_r == 0)
+ {
+ if (add_eq_node(sp->next_pi, sp_node))
+ GCALC_DBUG_RETURN(1);
+ continue;
+ }
+
+ if (sp->event)
+ {
+#ifndef GCALC_DBUG_OFF
+ cur_pi_r= node_on_right(sp_node->pi, sp->pi, sp->next_pi);
+ GCALC_DBUG_ASSERT(cur_pi_r == 0);
+#endif /*GCALC_DBUG_OFF*/
+ continue;
+ }
+ cur_pi_r= node_on_right(sp_node->pi, sp->pi, sp->next_pi);
+ GCALC_DBUG_ASSERT(cur_pi_r >= 0);
+ //GCALC_DBUG_ASSERT(cur_pi_r > 0); /* Is it ever violated? */
+ if (cur_pi_r > 0 && add_intersection(sp, sp_node, m_cur_pi))
+ GCALC_DBUG_RETURN(1);
+ }
+
+ /* Scan to the end of the slice */
+ sp= sp->get_next();
+
+ for (; sp; sp= sp->get_next())
+ {
+ GCALC_DBUG_ASSERT(!sp->is_bottom());
+ GCALC_DBUG_PRINT(("right cut_edge %d", sp->thread));
+ if (sp->next_pi == sp_node->next_pi ||
+ gcalc_cmp_coord1(*sp_node->r_border, *sp->l_border) < 0)
+ continue;
+ sp_pi_r= node_on_right(sp->next_pi, sp_node->pi, sp_node->next_pi);
+ if (sp_pi_r > 0)
+ continue;
+ cur_pi_r= node_on_right(sp_node->next_pi, sp->pi, sp->next_pi);
+ if (cur_pi_r < 0)
+ continue;
+ if (cur_pi_r == 0 && sp_pi_r == 0)
+ {
+ int cmp_res= cmp_point_info(sp->next_pi, sp_node->next_pi);
+ if (cmp_res > 0)
+ {
+ if (add_eq_node(sp_node->next_pi, sp))
+ GCALC_DBUG_RETURN(1);
+ }
+ else if (cmp_res < 0)
+ {
+ if (add_eq_node(sp->next_pi, sp_node))
+ GCALC_DBUG_RETURN(1);
+ }
+ continue;
+ }
+ if (cur_pi_r == 0)
+ {
+ if (add_eq_node(sp_node->next_pi, sp))
+ GCALC_DBUG_RETURN(1);
+ continue;
+ }
+ else if (sp_pi_r == 0)
+ {
+ if (add_eq_node(sp->next_pi, sp_node))
+ GCALC_DBUG_RETURN(1);
+ continue;
+ }
+
+ if (sp->event)
+ {
+#ifndef GCALC_DBUG_OFF
+ cur_pi_r= node_on_right(sp_node->pi, sp->pi, sp->next_pi);
+ GCALC_DBUG_ASSERT(cur_pi_r == 0);
+#endif /*GCALC_DBUG_OFF*/
+ continue;
+ }
+ cur_pi_r= node_on_right(sp_node->pi, sp->pi, sp->next_pi);
+ GCALC_DBUG_ASSERT(cur_pi_r <= 0);
+ //GCALC_DBUG_ASSERT(cur_pi_r < 0); /* Is it ever violated? */
+ if (cur_pi_r < 0 && add_intersection(sp_node, sp, m_cur_pi))
+ GCALC_DBUG_RETURN(1);
+ }
+
+ GCALC_DBUG_RETURN(0);
+}
+
+
+int Gcalc_scan_iterator::node_scan()
+{
+ point *sp= state.slice;
+ Gcalc_heap::Info *cur_pi= m_cur_pi;
+
+ GCALC_DBUG_ENTER("Gcalc_scan_iterator::node_scan");
+
+ /* Scan to the event point. */
+ /* Can be avoided if we add link to the sp to the Info. */
+ for (; sp->next_pi != cur_pi; sp= sp->get_next())
+ {}
+
+ GCALC_DBUG_PRINT(("node for %d", sp->thread));
+ /* Handle the point itself. */
+ sp->pi= cur_pi;
+ sp->next_pi= cur_pi->node.shape.left;
+ sp->event= scev_point;
+ calc_dx_dy(sp);
+
+ GCALC_DBUG_RETURN(add_events_for_node(sp));
+}
+
+
+void Gcalc_scan_iterator::eq_scan()
+{
+ point *sp= eq_sp(m_cur_pi);
+ GCALC_DBUG_ENTER("Gcalc_scan_iterator::eq_scan");
+
+#ifndef GCALC_DBUG_OFF
+ {
+ point *cur_p= state.slice;
+ for (; cur_p && cur_p != sp; cur_p= cur_p->get_next())
+ {}
+ GCALC_DBUG_ASSERT(cur_p);
+ }
+#endif /*GCALC_DBUG_OFF*/
+ if (!sp->event)
+ {
+ sp->event= scev_intersection;
+ sp->ev_pi= m_cur_pi;
+ }
+
+ GCALC_DBUG_VOID_RETURN;
+}
+
+
+void Gcalc_scan_iterator::intersection_scan()
+{
+ intersection_info *ii= i_data(m_cur_pi);
+ GCALC_DBUG_ENTER("Gcalc_scan_iterator::intersection_scan");
+
+#ifndef GCALC_DBUG_OFF
+ {
+ point *sp= state.slice;
+ for (; sp && sp != ii->edge_a; sp= sp->get_next())
+ {}
+ GCALC_DBUG_ASSERT(sp);
+ for (; sp && sp != ii->edge_b; sp= sp->get_next())
+ {}
+ GCALC_DBUG_ASSERT(sp);
+ }
+#endif /*GCALC_DBUG_OFF*/
+
+ ii->edge_a->event= ii->edge_b->event= scev_intersection;
+ ii->edge_a->ev_pi= ii->edge_b->ev_pi= m_cur_pi;
+ free_item(ii);
+ m_cur_pi->node.intersection.data= NULL;
+
+ GCALC_DBUG_VOID_RETURN;
+}
+
+
+int Gcalc_scan_iterator::add_intersection(point *sp_a, point *sp_b,
+ Gcalc_heap::Info *pi_from)
+{
+ Gcalc_heap::Info *ii;
+ intersection_info *i_calc;
+ int cmp_res;
+ int skip_next= 0;
+
+ GCALC_DBUG_ENTER("Gcalc_scan_iterator::add_intersection");
+ if (!(i_calc= new_intersection_info(sp_a, sp_b)) ||
+ !(ii= new_intersection(m_heap, i_calc)))
+ GCALC_DBUG_RETURN(1);
+
+ ii->node.intersection.equal= 0;
+
+ for (;
+ pi_from->get_next() != sp_a->next_pi &&
+ pi_from->get_next() != sp_b->next_pi;
+ pi_from= pi_from->get_next())
+ {
+ Gcalc_heap::Info *cur= pi_from->get_next();
+ if (skip_next)
+ {
+ if (cur->type == Gcalc_heap::nt_intersection)
+ skip_next= cur->node.intersection.equal;
+ else
+ skip_next= 0;
+ continue;
+ }
+ if (cur->type == Gcalc_heap::nt_intersection)
+ {
+ cmp_res= cmp_intersections(cur, ii);
+ skip_next= cur->node.intersection.equal;
+ }
+ else if (cur->type == Gcalc_heap::nt_eq_node)
+ continue;
+ else
+ cmp_res= cmp_node_isc(cur, ii);
+ if (cmp_res == 0)
+ {
+ ii->node.intersection.equal= 1;
+ break;
+ }
+ else if (cmp_res > 0)
+ break;
+ }
+
+ /* Intersection inserted before the equal point. */
+ ii->next= pi_from->get_next();
+ pi_from->next= ii;
+
+ GCALC_DBUG_RETURN(0);
+}
+
+
+int Gcalc_scan_iterator::add_eq_node(Gcalc_heap::Info *node, point *sp)
+{
+ Gcalc_heap::Info *en;
+
+ GCALC_DBUG_ENTER("Gcalc_scan_iterator::add_intersection");
+ en= new_eq_point(m_heap, node, sp);
+ if (!en)
+ GCALC_DBUG_RETURN(1);
+
+ /* eq_node inserted after the equal point. */
+ en->next= node->get_next();
+ node->next= en;
+
+ GCALC_DBUG_RETURN(0);
+}
+
+
+void calc_t(Gcalc_coord2 t_a, Gcalc_coord2 t_b,
+ Gcalc_coord1 dxa, Gcalc_coord1 dxb,
+ const Gcalc_heap::Info *p1, const Gcalc_heap::Info *p2,
+ const Gcalc_heap::Info *p3, const Gcalc_heap::Info *p4)
+{
+ Gcalc_coord1 a2_a1x, a2_a1y;
+ Gcalc_coord2 x1y2, x2y1;
+ Gcalc_coord1 dya, dyb;
+
+ gcalc_sub_coord1(a2_a1x, p3->node.shape.ix, p1->node.shape.ix);
+ gcalc_sub_coord1(a2_a1y, p3->node.shape.iy, p1->node.shape.iy);
+
+ gcalc_sub_coord1(dxa, p2->node.shape.ix, p1->node.shape.ix);
+ gcalc_sub_coord1(dya, p2->node.shape.iy, p1->node.shape.iy);
+ gcalc_sub_coord1(dxb, p4->node.shape.ix, p3->node.shape.ix);
+ gcalc_sub_coord1(dyb, p4->node.shape.iy, p3->node.shape.iy);
+
+ gcalc_mul_coord1(x1y2, dxa, dyb);
+ gcalc_mul_coord1(x2y1, dya, dxb);
+ gcalc_sub_coord(t_b, GCALC_COORD_BASE2, x1y2, x2y1);
+
+
+ gcalc_mul_coord1(x1y2, a2_a1x, dyb);
+ gcalc_mul_coord1(x2y1, a2_a1y, dxb);
+ gcalc_sub_coord(t_a, GCALC_COORD_BASE2, x1y2, x2y1);
+}
+
+
+double Gcalc_scan_iterator::get_y() const
+{
+ if (state.pi->type == Gcalc_heap::nt_intersection)
+ {
+ Gcalc_coord1 dxa, dya;
+ Gcalc_coord2 t_a, t_b;
+ Gcalc_coord3 a_tb, b_ta, y_exp;
+ calc_t(t_a, t_b, dxa, dya,
+ state.pi->node.intersection.p1, state.pi->node.intersection.p2, state.pi->node.intersection.p3, state.pi->node.intersection.p4);
+
+
+ gcalc_mul_coord(a_tb, GCALC_COORD_BASE3,
+ t_b, GCALC_COORD_BASE2, state.pi->node.intersection.p1->node.shape.iy, GCALC_COORD_BASE);
+ gcalc_mul_coord(b_ta, GCALC_COORD_BASE3,
+ t_a, GCALC_COORD_BASE2, dya, GCALC_COORD_BASE);
+
+ gcalc_add_coord(y_exp, GCALC_COORD_BASE3, a_tb, b_ta);
+
+ return (get_pure_double(y_exp, GCALC_COORD_BASE3) /
+ get_pure_double(t_b, GCALC_COORD_BASE2)) / m_heap->coord_extent;
+ }
+ else
+ return state.pi->node.shape.y;
+}
+
+
+double Gcalc_scan_iterator::get_event_x() const
+{
+ if (state.pi->type == Gcalc_heap::nt_intersection)
+ {
+ Gcalc_coord1 dxa, dya;
+ Gcalc_coord2 t_a, t_b;
+ Gcalc_coord3 a_tb, b_ta, x_exp;
+ calc_t(t_a, t_b, dxa, dya,
+ state.pi->node.intersection.p1, state.pi->node.intersection.p2, state.pi->node.intersection.p3, state.pi->node.intersection.p4);
+
+
+ gcalc_mul_coord(a_tb, GCALC_COORD_BASE3,
+ t_b, GCALC_COORD_BASE2, state.pi->node.intersection.p1->node.shape.ix, GCALC_COORD_BASE);
+ gcalc_mul_coord(b_ta, GCALC_COORD_BASE3,
+ t_a, GCALC_COORD_BASE2, dxa, GCALC_COORD_BASE);
+
+ gcalc_add_coord(x_exp, GCALC_COORD_BASE3, a_tb, b_ta);
+
+ return (get_pure_double(x_exp, GCALC_COORD_BASE3) /
+ get_pure_double(t_b, GCALC_COORD_BASE2)) / m_heap->coord_extent;
+ }
+ else
+ return state.pi->node.shape.x;
+}
+
+double Gcalc_scan_iterator::get_h() const
+{
+ double cur_y= get_y();
+ double next_y;
+ if (state.pi->type == Gcalc_heap::nt_intersection)
+ {
+ double x;
+ state.pi->calc_xy(&x, &next_y);
+ }
+ else
+ next_y= state.pi->next ? state.pi->get_next()->node.shape.y : 0.0;
+ return next_y - cur_y;
+}
+
+
+double Gcalc_scan_iterator::get_sp_x(const point *sp) const
+{
+ double dy;
+ if (sp->event & (scev_end | scev_two_ends | scev_point))
+ return sp->pi->node.shape.x;
+ dy= sp->next_pi->node.shape.y - sp->pi->node.shape.y;
+ if (fabs(dy) < 1e-12)
+ return sp->pi->node.shape.x;
+ return sp->pi->node.shape.x + (sp->next_pi->node.shape.x - sp->pi->node.shape.x) * dy;
+}
+
+
+double Gcalc_scan_iterator::get_pure_double(const Gcalc_internal_coord *d,
+ int d_len)
+{
+ int n= 1;
+ long double res= (long double) FIRST_DIGIT(d[0]);
+ do
+ {
+ res*= (long double) GCALC_DIG_BASE;
+ res+= (long double) d[n];
+ } while(++n < d_len);
+
+ if (GCALC_SIGN(d[0]))
+ res*= -1.0;
+ return res;
+}
+
+
+#endif /* HAVE_SPATIAL */