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package org.bukkit;
import static org.hamcrest.Matchers.*;
import static org.junit.Assert.*;
import java.util.List;
import java.util.Random;
import org.bukkit.util.Vector;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameter;
import org.junit.runners.Parameterized.Parameters;
import com.google.common.collect.ImmutableList;
@RunWith(Parameterized.class)
public class LocationTest {
private static final double δ = 1.0 / 1000000;
/**
* <pre>
* a² + b² = c², a = b
* => 2∙(a²) = 2∙(b²) = c², c = 1
* => 2∙(a²) = 1
* => a² = 1/2
* => a = √(1/2) ∎
* </pre>
*/
private static final double HALF_UNIT = Math.sqrt(1 / 2f);
/**
* <pre>
* a² + b² = c², c = √(1/2)
* => a² + b² = √(1/2)², a = b
* => 2∙(a²) = 2∙(b²) = 1/2
* => a² = 1/4
* => a = √(1/4) ∎
* </pre>
*/
private static final double HALF_HALF_UNIT = Math.sqrt(1 / 4f);
@Parameters(name= "{index}: {0}")
public static List<Object[]> data() {
Random RANDOM = new Random(1l); // Test is deterministic
int r = 0;
return ImmutableList.<Object[]>of(
new Object[] { "X",
1, 0, 0,
270, 0
},
new Object[] { "-X",
-1, 0, 0,
90, 0
},
new Object[] { "Z",
0, 0, 1,
0, 0
},
new Object[] { "-Z",
0, 0, -1,
180, 0
},
new Object[] { "Y",
0, 1, 0,
0, -90 // Zero is here as a "default" value
},
new Object[] { "-Y",
0, -1, 0,
0, 90 // Zero is here as a "default" value
},
new Object[] { "X Z",
HALF_UNIT, 0, HALF_UNIT,
(270 + 360) / 2, 0
},
new Object[] { "X -Z",
HALF_UNIT, 0, -HALF_UNIT,
(270 + 180) / 2, 0
},
new Object[] { "-X -Z",
-HALF_UNIT, 0, -HALF_UNIT,
(90 + 180) / 2, 0
},
new Object[] { "-X Z",
-HALF_UNIT, 0, HALF_UNIT,
(90 + 0) / 2, 0
},
new Object[] { "X Y Z",
HALF_HALF_UNIT, HALF_UNIT, HALF_HALF_UNIT,
(270 + 360) / 2, -45
},
new Object[] { "-X -Y -Z",
-HALF_HALF_UNIT, -HALF_UNIT, -HALF_HALF_UNIT,
(90 + 180) / 2, 45
},
getRandom(RANDOM, r++),
getRandom(RANDOM, r++),
getRandom(RANDOM, r++),
getRandom(RANDOM, r++),
getRandom(RANDOM, r++),
getRandom(RANDOM, r++),
getRandom(RANDOM, r++),
getRandom(RANDOM, r++),
getRandom(RANDOM, r++),
getRandom(RANDOM, r++),
getRandom(RANDOM, r++),
getRandom(RANDOM, r++),
getRandom(RANDOM, r++),
getRandom(RANDOM, r++),
getRandom(RANDOM, r++),
getRandom(RANDOM, r++),
getRandom(RANDOM, r++),
getRandom(RANDOM, r++)
);
}
private static Object[] getRandom(Random random, int index) {
final double YAW_FACTOR = 360;
final double YAW_OFFSET = 0;
final double PITCH_FACTOR = 180;
final double PITCH_OFFSET = -90;
final double CARTESIAN_FACTOR = 256;
final double CARTESIAN_OFFSET = -128;
Vector vector;
Location location;
if (random.nextBoolean()) {
float pitch = (float) (random.nextDouble() * PITCH_FACTOR + PITCH_OFFSET);
float yaw = (float) (random.nextDouble() * YAW_FACTOR + YAW_OFFSET);
location = getEmptyLocation();
location.setPitch(pitch);
location.setYaw(yaw);
vector = location.getDirection();
} else {
double x = random.nextDouble() * CARTESIAN_FACTOR + CARTESIAN_OFFSET;
double y = random.nextDouble() * CARTESIAN_FACTOR + CARTESIAN_OFFSET;
double z = random.nextDouble() * CARTESIAN_FACTOR + CARTESIAN_OFFSET;
location = getEmptyLocation();
vector = new Vector(x, y, z).normalize();
location.setDirection(vector);
}
return new Object[] { "R" + index,
vector.getX(), vector.getY(), vector.getZ(),
location.getYaw(), location.getPitch()
};
}
@Parameter(0)
public String nane;
@Parameter(1)
public double x;
@Parameter(2)
public double y;
@Parameter(3)
public double z;
@Parameter(4)
public float yaw;
@Parameter(5)
public float pitch;
@Test
public void testExpectedPitchYaw() {
Location location = getEmptyLocation().setDirection(getVector());
assertThat((double) location.getYaw(), is(closeTo(yaw, δ)));
assertThat((double) location.getPitch(), is(closeTo(pitch, δ)));
}
@Test
public void testExpectedXYZ() {
Vector vector = getLocation().getDirection();
assertThat(vector.getX(), is(closeTo(x, δ)));
assertThat(vector.getY(), is(closeTo(y, δ)));
assertThat(vector.getZ(), is(closeTo(z, δ)));
}
private Vector getVector() {
return new Vector(x, y, z);
}
private static Location getEmptyLocation() {
return new Location(null, 0, 0, 0);
}
private Location getLocation() {
Location location = getEmptyLocation();
location.setYaw(yaw);
location.setPitch(pitch);
return location;
}
}
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