code: public void setAngle(float angle) {
          this.angle = angle;
          float cos = (float) Math.cos(angle);
          float sin = (float) Math.sin(angle);
          m00 = cos;
          m01 = sin;
          m10 = -sin;
          m11 = cos;
      }
docs: Specifies the angle of the effect.
  
  @param angle the angle of the effect.
  @angle