Quelle nsTransform2D.h Sprache: C

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef nsTransform2D_h___
#define nsTransform2D_h___

#include "nsCoord.h"

class nsTransform2D {
private:
  /**
   * This represents the following matrix (note that the order of row/column
   * indices is opposite to usual notation)
   *
   *      / m00   0   m20  \
   * M =  |  0   m11  m21  |
   *      \  0    0    1   /
   *
   * Transformation of a coordinate (x, y) is obtained by setting
   * v = (x, y, 1)^T and evaluating  M . v
   **/

  float m00, m11, m20, m21;

public:
  nsTransform2D(void) {
    m20 = m21 = 0.0f;
    m00 = m11 = 1.0f;
  }

  ~nsTransform2D(void) = default;

  /**
   * set this transform to a translation
   *
   * @param      tx, x translation
   * @param      ty, y translation
   **/

  void SetToTranslate(float tx, float ty) {
    m00 = m11 = 1.0f;
    m20 = tx;
    m21 = ty;
  }

  /**
   * get the translation portion of this transform
   *
   * @param      pt, Point to return translation values in
   **/

  void GetTranslationCoord(nscoord* ptX, nscoord* ptY) const {
    *ptX = NSToCoordRound(m20);
    *ptY = NSToCoordRound(m21);
  }

  /**
   * apply matrix to vector
   *
   * @param    pt Point to transform
   **/

  void TransformCoord(nscoord* ptX, nscoord* ptY) const;

  /**
   * apply matrix to rect
   *
   * @param    rect Rect to transform
   **/

  void TransformCoord(nscoord* aX, nscoord* aY, nscoord* aWidth,
                      nscoord* aHeight) const;

  /**
   * add a scale to a Transform via x, y pair
   *
   * @param    ptX x value to add as x scale
   * @param    ptY y value to add as y scale
   **/

  void AddScale(float ptX, float ptY) {
    m00 *= ptX;
    m11 *= ptY;
  }

  /**
   * Set the scale (overriding any previous calls to AddScale, but leaving
   * any existing translation).
   *
   * @param    ptX x value to add as x scale
   * @param    ptY y value to add as y scale
   **/

  void SetScale(float ptX, float ptY) {
    m00 = ptX;
    m11 = ptY;
  }
};

#endif

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