Class PMatrix2D

core/src/processing/core/PMatrix2D.java:39–534

3x2 affine matrix implementation. Matrices are used to describe a transformation; see PMatrix for a general description. This matrix looks like the following when multiplying a vector (x, y) in mult(). [m00 m01 m02][x] [m00 x + m01 y + m02 1] [x'] [m10 m11 m12][y] = [m10 x

 * They are modified by the various transformation functions.
 */
public class PMatrix2D implements PMatrix {

  public float m00, m01, m02;
  public float m10, m11, m12;


  /**
   * Create a new matrix, set to the identity matrix.
   */
  public PMatrix2D() {
    reset();
  }


  public PMatrix2D(float m00, float m01, float m02,
                   float m10, float m11, float m12) {
    set(m00, m01, m02,
        m10, m11, m12);
  }


  public PMatrix2D(PMatrix matrix) {
    set(matrix);
  }


  public void reset() {
    set(1, 0, 0,
        0, 1, 0);
  }


  /**
   * Returns a copy of this PMatrix.
   */
  public PMatrix2D get() {
    PMatrix2D outgoing = new PMatrix2D();
    outgoing.set(this);
    return outgoing;
  }


  /**
   * Copies the matrix contents into a 6 entry float array.
   * If target is null (or not the correct size), a new array will be created.
   * Returned in the order {@code {m00, m01, m02, m10, m11, m12}}.
   */
  public float[] get(float[] target) {
    if ((target == null) || (target.length != 6)) {
      target = new float[6];
    }
    target[0] = m00;
    target[1] = m01;
    target[2] = m02;

    target[3] = m10;
    target[4] = m11;
    target[5] = m12;