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Added Vector.isCollinearWith(Vector other).

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Also added a test for it.
This commit is contained in:
TomyLobo 2012-01-05 21:07:24 +01:00
parent ef3aeda0dc
commit 450feb6630
2 changed files with 107 additions and 1 deletions
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38
src/main/java/com/sk89q/worldedit/Vector.java
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@ -600,6 +600,43 @@ public class Vector {
);
}
public boolean isCollinearWith(Vector other) {
if (x == 0 && y == 0 && z == 0) {
// this is a zero vector
return true;
}
final double otherX = other.x;
final double otherY = other.y;
final double otherZ = other.z;
if (otherX == 0 && otherY == 0 && otherZ == 0) {
// other is a zero vector
return true;
}
if ((x == 0) != (otherX == 0)) return false;
if ((y == 0) != (otherY == 0)) return false;
if ((z == 0) != (otherZ == 0)) return false;
final double quotientX = otherX / x;
if (!Double.isNaN(quotientX)) {
return other.equals(multiply(quotientX));
}
final double quotientY = otherY / y;
if (!Double.isNaN(quotientY)) {
return other.equals(multiply(quotientY));
}
final double quotientZ = otherZ / z;
if (!Double.isNaN(quotientZ)) {
return other.equals(multiply(quotientZ));
}
throw new RuntimeException("This should not happen");
}
/**
* Get a block point from a point.
*
@ -643,7 +680,6 @@ public class Vector {
Vector other = (Vector) obj;
return other.getX() == this.x && other.getY() == this.y && other.getZ() == this.z;
}
/**

70
src/test/java/com/sk89q/worldedit/VectorTest.java Normal file
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@ -0,0 +1,70 @@
package com.sk89q.worldedit;
import org.junit.*;
import static org.junit.Assert.*;
public class VectorTest {
@Test
public void collinearityTest() {
assertCollinear(0,0,0, 0,0,0);
assertCollinear(0,0,0, 1,0,0);
assertCollinear(0,0,0, 0,1,0);
assertCollinear(0,0,0, 0,0,1);
assertCollinear(1,0,0, 0,0,0);
assertCollinear(0,1,0, 0,0,0);
assertCollinear(0,0,1, 0,0,0);
assertCollinear(1,0,0, 2,0,0);
assertNotCollinear(1,0,0, 0,1,0);
assertNotCollinear(2,2,2, 8,4,4);
assertCollinear(8,2,2, 8,2,2);
assertNotCollinear(4,2,4, 4,4,4);
assertNotCollinear(1,1,2, 4,8,2);
assertNotCollinear(4,1,8, 1,4,4);
assertCollinear(2,4,2, 1,2,1);
assertNotCollinear(2,2,4, 1,2,1);
assertNotCollinear(4,4,1, 4,4,4);
assertNotCollinear(4,1,4, 1,8,2);
assertCollinear(8,8,4, 4,4,2);
assertNotCollinear(2,1,8, 1,1,2);
assertNotCollinear(8,1,2, 2,1,2);
assertNotCollinear(4,4,8, 2,2,8);
assertNotCollinear(8,4,8, 1,4,8);
assertNotCollinear(2,2,2, 1,4,2);
assertNotCollinear(1,1,2, 8,8,2);
assertNotCollinear(4,4,8, 8,4,4);
assertNotCollinear(1,8,2, 4,4,4);
assertNotCollinear(8,4,2, 1,2,2);
assertNotCollinear(1,8,2, 8,1,4);
assertNotCollinear(4,8,1, 4,8,8);
assertNotCollinear(8,1,8, 8,8,8);
assertNotCollinear(8,4,1, 4,2,2);
assertNotCollinear(4,8,1, 4,2,1);
assertNotCollinear(8,8,1, 2,4,2);
assertCollinear(8,1,4, 8,1,4);
assertNotCollinear(4,1,1, 2,4,8);
assertNotCollinear(4,2,8, 1,4,1);
assertNotCollinear(1,8,2, 1,8,1);
assertNotCollinear(1,1,2, 4,2,2);
}
private void assertCollinear(double ax, double ay, double az, double bx, double by, double bz) {
final Vector a = new Vector(ax,ay,az);
final Vector b = new Vector(bx,by,bz);
assertTrue(a.isCollinearWith(b));
assertTrue(b.isCollinearWith(a));
assertTrue(a.multiply(-1).isCollinearWith(b));
assertTrue(a.isCollinearWith(b.multiply(-1)));
}
private void assertNotCollinear(double ax, double ay, double az, double bx, double by, double bz) {
final Vector a = new Vector(ax,ay,az);
final Vector b = new Vector(bx,by,bz);
assertFalse(a.isCollinearWith(b));
assertFalse(b.isCollinearWith(a));
assertFalse(a.multiply(-1).isCollinearWith(b));
assertFalse(a.isCollinearWith(b.multiply(-1)));
}
}