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remove -90 degree adjustment (hacky) and add new helper for getting the angle in the XZ plane between two Vector3s

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Gered 2013-10-27 09:44:33 -04:00
parent d5472b2701
commit 4f3b8ff2b7
1 changed files with 14 additions and 1 deletions
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15
src/com/blarg/gdx/math/MathHelpers.java
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@ -7,6 +7,7 @@ import com.badlogic.gdx.math.collision.BoundingBox;
public final class MathHelpers { public final class MathHelpers {
static final Vector2 v2tmpA = new Vector2(); static final Vector2 v2tmpA = new Vector2();
static final Vector2 v2tmpB = new Vector2();
public static final float FLOAT_EPSILON = 1.401298E-45f; // smallest floating point value greater then zero public static final float FLOAT_EPSILON = 1.401298E-45f; // smallest floating point value greater then zero
public static final float EPSILON = 0.000001f; //0.0000000001f; public static final float EPSILON = 0.000001f; //0.0000000001f;
@ -35,7 +36,7 @@ public final class MathHelpers {
public static void getDirectionVector3FromYAxis(float yAxisDegrees, Vector3 result) { public static void getDirectionVector3FromYAxis(float yAxisDegrees, Vector3 result) {
result.y = 0.0f; result.y = 0.0f;
float adjustedAngle = rolloverClamp(yAxisDegrees - 90.0f, 0.0f, 360.0f); float adjustedAngle = rolloverClamp(yAxisDegrees, 0.0f, 360.0f);
getPointOnCircle(1.0f, adjustedAngle, v2tmpA); getPointOnCircle(1.0f, adjustedAngle, v2tmpA);
result.x = v2tmpA.x; result.x = v2tmpA.x;
result.z = v2tmpA.y; result.z = v2tmpA.y;
@ -51,6 +52,18 @@ public final class MathHelpers {
result.z = -((float)Math.cos(pitch) * (float)Math.cos(yaw)); result.z = -((float)Math.cos(pitch) * (float)Math.cos(yaw));
} }
public static float getYAngleBetween(Vector3 a, Vector3 b) {
v2tmpA.set(a.x, a.z);
v2tmpB.set(b.x, b.z);
float angle = v2tmpB.sub(v2tmpA)
.angle();
if (angle < 0)
angle += 360.0f;
return angle;
}
public static float getAngleBetween2D(final Vector2 a, final Vector2 b) { public static float getAngleBetween2D(final Vector2 a, final Vector2 b) {
v2tmpA.set(a); v2tmpA.set(a);
v2tmpA.sub(b); v2tmpA.sub(b);