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◆ test_lw_segment_intersects()

static void test_lw_segment_intersects ( void  )
static

Definition at line 120 of file cu_algorithm.c.

References lw_segment_intersects(), SEG_COLINEAR, SEG_CROSS_LEFT, SEG_CROSS_RIGHT, SEG_NO_INTERSECTION, setpoint, POINT2D::x, and POINT2D::y.

Referenced by algorithms_suite_setup().

121 {
122 
123 #define setpoint(p, x1, y1) {(p).x = (x1); (p).y = (y1);}
124 
125  POINT2D p1, p2, q1, q2;
126 
127  /* P: Vertical line at x=0 */
128  setpoint(p1, 0.0, 0.0);
129  p1.x = 0.0;
130  p1.y = 0.0;
131  p2.x = 0.0;
132  p2.y = 1.0;
133 
134  /* Q: Horizontal line crossing left to right */
135  q1.x = -0.5;
136  q1.y = 0.5;
137  q2.x = 0.5;
138  q2.y = 0.5;
139  CU_ASSERT( lw_segment_intersects(&p1, &p2, &q1, &q2) == SEG_CROSS_RIGHT );
140 
141  /* Q: Horizontal line crossing right to left */
142  q1.x = 0.5;
143  q1.y = 0.5;
144  q2.x = -0.5;
145  q2.y = 0.5;
146  CU_ASSERT( lw_segment_intersects(&p1, &p2, &q1, &q2) == SEG_CROSS_LEFT );
147 
148  /* Q: Horizontal line not crossing right to left */
149  q1.x = 0.5;
150  q1.y = 1.5;
151  q2.x = -0.5;
152  q2.y = 1.5;
153  CU_ASSERT( lw_segment_intersects(&p1, &p2, &q1, &q2) == SEG_NO_INTERSECTION );
154 
155  /* Q: Horizontal line crossing at second vertex right to left */
156  q1.x = 0.5;
157  q1.y = 1.0;
158  q2.x = -0.5;
159  q2.y = 1.0;
160  CU_ASSERT( lw_segment_intersects(&p1, &p2, &q1, &q2) == SEG_NO_INTERSECTION );
161 
162  /* Q: Horizontal line crossing at first vertex right to left */
163  q1.x = 0.5;
164  q1.y = 0.0;
165  q2.x = -0.5;
166  q2.y = 0.0;
167  CU_ASSERT( lw_segment_intersects(&p1, &p2, &q1, &q2) == SEG_CROSS_LEFT );
168 
169  /* Q: Diagonal line with large range crossing at first vertex right to left */
170  q1.x = 0.5;
171  q1.y = 10.0;
172  q2.x = -0.5;
173  q2.y = -10.0;
174  CU_ASSERT( lw_segment_intersects(&p1, &p2, &q1, &q2) == SEG_CROSS_LEFT );
175 
176  /* Q: Diagonal line with large range crossing at second vertex right to left */
177  q1.x = 0.5;
178  q1.y = 11.0;
179  q2.x = -0.5;
180  q2.y = -9.0;
181  CU_ASSERT( lw_segment_intersects(&p1, &p2, &q1, &q2) == SEG_NO_INTERSECTION );
182 
183  /* Q: Horizontal touching from left at second vertex*/
184  q1.x = -0.5;
185  q1.y = 0.5;
186  q2.x = 0.0;
187  q2.y = 0.5;
188  CU_ASSERT( lw_segment_intersects(&p1, &p2, &q1, &q2) == SEG_NO_INTERSECTION );
189 
190  /* Q: Horizontal touching from right at first vertex */
191  q1.x = 0.0;
192  q1.y = 0.5;
193  q2.x = 0.5;
194  q2.y = 0.5;
195  CU_ASSERT( lw_segment_intersects(&p1, &p2, &q1, &q2) == SEG_CROSS_RIGHT );
196 
197  /* Q: Horizontal touching from left and far below on second vertex */
198  q1.x = -0.5;
199  q1.y = -10.5;
200  q2.x = 0.0;
201  q2.y = 0.5;
202  CU_ASSERT( lw_segment_intersects(&p1, &p2, &q1, &q2) == SEG_NO_INTERSECTION );
203 
204  /* Q: Horizontal touching from right and far above on second vertex */
205  q1.x = 0.5;
206  q1.y = 10.5;
207  q2.x = 0.0;
208  q2.y = 0.5;
209  CU_ASSERT( lw_segment_intersects(&p1, &p2, &q1, &q2) == SEG_NO_INTERSECTION );
210 
211  /* Q: Co-linear from top */
212  q1.x = 0.0;
213  q1.y = 10.0;
214  q2.x = 0.0;
215  q2.y = 0.5;
216  CU_ASSERT( lw_segment_intersects(&p1, &p2, &q1, &q2) == SEG_COLINEAR );
217 
218  /* Q: Co-linear from bottom */
219  q1.x = 0.0;
220  q1.y = -10.0;
221  q2.x = 0.0;
222  q2.y = 0.5;
223  CU_ASSERT( lw_segment_intersects(&p1, &p2, &q1, &q2) == SEG_COLINEAR );
224 
225  /* Q: Co-linear contained */
226  q1.x = 0.0;
227  q1.y = 0.4;
228  q2.x = 0.0;
229  q2.y = 0.5;
230  CU_ASSERT( lw_segment_intersects(&p1, &p2, &q1, &q2) == SEG_COLINEAR );
231 
232  /* Q: Horizontal touching at end point from left */
233  q1.x = -0.5;
234  q1.y = 1.0;
235  q2.x = 0.0;
236  q2.y = 1.0;
237  CU_ASSERT( lw_segment_intersects(&p1, &p2, &q1, &q2) == SEG_NO_INTERSECTION );
238 
239  /* Q: Horizontal touching at end point from right */
240  q1.x = 0.0;
241  q1.y = 1.0;
242  q2.x = 0.0;
243  q2.y = 0.5;
244  CU_ASSERT( lw_segment_intersects(&p1, &p2, &q1, &q2) == SEG_COLINEAR );
245 
246  /* Q: Horizontal touching at start point from left */
247  q1.x = 0.0;
248  q1.y = 0.0;
249  q2.x = -0.5;
250  q2.y = 0.0;
251  CU_ASSERT( lw_segment_intersects(&p1, &p2, &q1, &q2) == SEG_CROSS_LEFT );
252 
253  /* Q: Horizontal touching at start point from right */
254  q1.x = 0.0;
255  q1.y = 0.0;
256  q2.x = 0.5;
257  q2.y = 0.0;
258  CU_ASSERT( lw_segment_intersects(&p1, &p2, &q1, &q2) == SEG_CROSS_RIGHT );
259 
260 }
double x
Definition: liblwgeom.h:330
double y
Definition: liblwgeom.h:330
#define setpoint(p, x1, y1)
int lw_segment_intersects(const POINT2D *p1, const POINT2D *p2, const POINT2D *q1, const POINT2D *q2)
returns the kind of CG_SEGMENT_INTERSECTION_TYPE behavior of lineseg 1 (constructed from p1 and p2) a...
Definition: lwalgorithm.c:372
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