/
LineTest.java
77 lines (68 loc) · 3.2 KB
/
LineTest.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
package org.ndx.codingame.lib2d;
import static java.lang.Math.sqrt;
import static org.assertj.core.api.Assertions.*;
import static org.ndx.codingame.lib2d.Geometry.at;
import static org.ndx.codingame.lib2d.Geometry.from;
import org.junit.Test;
import org.ndx.codingame.lib2d.continuous.ContinuousPoint;
public class LineTest {
@Test public void can_compute_infos_on_horizontal_line() {
ContinuousPoint first = at(0.0, 1);
Line tested = from(first).lineTo(at(1.0, 1));
assertThat(tested.coeffs.a).isEqualTo(0);
assertThat(tested.coeffs.b).isEqualTo(-1);
assertThat(tested.coeffs.c).isEqualTo(1);
assertThat(tested.coeffs.lineNorm).isEqualTo(1);
assertThat(tested.angle()).isEqualTo(0);
assertThat(tested.contains(at(0.5, 1))).isTrue();
assertThat(tested.distance2To(at(0, 0))).isEqualTo(1);
assertThat(tested.project(at(0.0, 0))).isEqualTo(first);
assertThat(tested.symetricOf(at(0.0, 0))).isEqualTo(at(0, 2));
assertThat(tested.pointAtNTimes(2)).isEqualTo(at(2, 1));
ContinuousPoint at_45_degrees = tested.pointAtAngle(first, 45, 1, PointBuilder.DEFAULT);
assertThat(at_45_degrees.x).isEqualTo(1/sqrt(2), within(Algebra.ZERO));
assertThat(at_45_degrees.y).isEqualTo(1+1/sqrt(2), within(Algebra.ZERO));
Line intersecting = from(0, 0).lineTo(2, 2);
assertThat(tested.intersectionWith(intersecting)).contains(at(1.0, 1));
}
@Test public void can_compute_infos_on_vertical_line() {
Line tested = from(at(1.0, 0)).lineTo(at(1.0, 1));
assertThat(tested.coeffs.a).isEqualTo(1);
assertThat(tested.coeffs.b).isEqualTo(0);
assertThat(tested.coeffs.c).isEqualTo(-1);
assertThat(tested.angle()).isEqualTo(90);
assertThat(tested.contains(at(1, 0.5))).isTrue();
assertThat(tested.distance2To(at(3, 1))).isEqualTo(2);
assertThat(tested.project(at(0.0, 0))).isEqualTo(at(1, 0));
assertThat(tested.symetricOf(at(0.0, 0))).isEqualTo(at(2, 0));
assertThat(tested.pointAtNTimes(2)).isEqualTo(at(1, 2));
Line intersecting = from(0, -1).lineTo(0, 1);
assertThat(tested.intersectionWith(intersecting)).isEmpty();
}
@Test public void can_compute_infos_on_vertical_reverse_line() {
Line tested = from(at(1.0, 1)).lineTo(at(1, 0));
assertThat(tested.coeffs.a).isEqualTo(-1);
assertThat(tested.coeffs.b).isEqualTo(0);
assertThat(tested.coeffs.c).isEqualTo(1);
assertThat(tested.angle()).isEqualTo(-90);
}
@Test public void can_compute_infos_on_diagonal_line() {
Line tested = from(at(0, 0)).lineTo(at(1, 1));
assertThat(tested.coeffs.a).isEqualTo(1);
assertThat(tested.coeffs.b).isEqualTo(-1);
assertThat(tested.coeffs.c).isEqualTo(0);
assertThat(tested.angle()).isEqualTo(45);
assertThat(tested.contains(at(0.5, 0.5))).isTrue();
assertThat(tested.distance2To(at(2, 0))).isCloseTo(sqrt(2), within(Algebra.ZERO));
assertThat(tested.project(at(0.0, 1))).isEqualTo(at(0.5, 0.5));
assertThat(tested.symetricOf(at(0.0, 1))).isEqualTo(at(1, -0));
assertThat(tested.pointAtNTimes(2)).isEqualTo(at(2, 2));
}
@Test public void can_compute_infos_on_diagonal_downslope_line() {
Line tested = from(at(0, 1)).lineTo(at(1, 0));
assertThat(tested.coeffs.a).isEqualTo(-1);
assertThat(tested.coeffs.b).isEqualTo(-1);
assertThat(tested.coeffs.c).isEqualTo(1);
assertThat(tested.angle()).isEqualTo(-45);
}
}