Rotate Matrix : Matrix « Game « Android

1. Android
2. Game
3. Matrix

Rotate Matrix

 

import android.opengl.Matrix;
import android.util.FloatMath;

class MatrixMath {
  public static final float DEG_TO_RAD = 0.01745329238474369f;
  
  public static final int AXIS_X = 0;
  public static final int AXIS_Y = 1;
  public static final int AXIS_Z = 2;
  
  private static float cosA;
  private static float sinA;
  
  private static float[] tempM = new float[16];
  private static float[] tempM2 = new float[16];
  
  public static void rotateM(float[] m, float angle, int axis) {
    Matrix.setIdentityM(tempM, 0);
    
    cosA = FloatMath.cos(angle * DEG_TO_RAD);
    sinA = FloatMath.sin(angle * DEG_TO_RAD);
    
    if (axis == AXIS_X) {
      tempM[5] = cosA;
      tempM[6] = sinA;
      tempM[9] = -sinA;
      tempM[10] = cosA;
    } else if (axis == AXIS_Y) {
      tempM[10] = cosA;
      tempM[8] = sinA;
      tempM[2] = -sinA;
      tempM[0] = cosA;
    } else if (axis == AXIS_Z) {
      tempM[0] = cosA;
      tempM[1] = sinA;
      tempM[4] = -sinA;
      tempM[5] = cosA;
    }
    
    System.arraycopy(m, 0, tempM2, 0, 16);
    
    Matrix.multiplyMM(m, 0, tempM2, 0, tempM, 0);
  }
}

   
  

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