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Improve PositionUtils and add tests (#582)

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Moulberry 2022-01-10 14:40:13 +08:00 committed by TheMode
parent 847bbf9bdc
commit 09245defd6
2 changed files with 58 additions and 3 deletions
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10
src/main/java/net/minestom/server/utils/position/PositionUtils.java
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@ -13,11 +13,15 @@ public final class PositionUtils {
} }
public static float getLookYaw(double dx, double dz) { public static float getLookYaw(double dx, double dz) {
final double horizontalAngle = Math.atan2(dz, dx); final double radians = Math.atan2(dz, dx);
return (float) (horizontalAngle * (180.0 / Math.PI)) - 90; final float degrees = (float)Math.toDegrees(radians) - 90;
if (degrees < -180) return degrees + 360;
if (degrees > 180) return degrees - 360;
return degrees;
} }
public static float getLookPitch(double dx, double dy, double dz) { public static float getLookPitch(double dx, double dy, double dz) {
return (float) Math.atan2(dy, Math.max(Math.abs(dx), Math.abs(dz))); final double radians = -Math.atan2(dy, Math.max(Math.abs(dx), Math.abs(dz)));
return (float) Math.toDegrees(radians);
} }
} }

51
src/test/java/net/minestom/server/utils/PositionUtilsTest.java Normal file
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@ -0,0 +1,51 @@
package net.minestom.server.utils;
import net.minestom.server.utils.position.PositionUtils;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;
public class PositionUtilsTest {
@Test
public void yaw() {
float plusX = PositionUtils.getLookYaw(10, 0);
assertEquals(-90, plusX, 1E-5);
float plusZ = PositionUtils.getLookYaw(0, 10);
assertEquals(0, plusZ, 1E-5);
float minusX = PositionUtils.getLookYaw(-10, 0);
assertEquals(90, minusX, 1E-5);
float minusZNegative = PositionUtils.getLookYaw(1E-5, -10);
if (minusZNegative < -180) fail();
assertEquals(-180, minusZNegative, 1E-4);
float minusZPositive = PositionUtils.getLookYaw(-1E-5, -10);
if (minusZPositive > 180) fail();
assertEquals(180, minusZPositive, 1E-4);
float oneThreeFive = PositionUtils.getLookYaw(-5, -5);
assertEquals(135, oneThreeFive, 1E-5);
float fortyFive = PositionUtils.getLookYaw(5, 5);
assertEquals(-45, fortyFive, 1E-5);
}
@Test
public void highPitch() {
float high = PositionUtils.getLookPitch(0, 999999, 0);
assertEquals(-90, high, 1E-5);
float low = PositionUtils.getLookPitch(0, -999999, 0);
assertEquals(90, low, 1E-5);
float zero = PositionUtils.getLookPitch(-5, 0, 5);
assertEquals(0, zero, 1E-5);
float fortyFive = PositionUtils.getLookPitch(5, 5, 0);
assertEquals(-45, fortyFive, 1E-5);
}
}