Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* libmspub
       3             :  * Version: MPL 1.1 / GPLv2+ / LGPLv2+
       4             :  *
       5             :  * The contents of this file are subject to the Mozilla Public License Version
       6             :  * 1.1 (the "License"); you may not use this file except in compliance with
       7             :  * the License or as specified alternatively below. You may obtain a copy of
       8             :  * the License at http://www.mozilla.org/MPL/
       9             :  *
      10             :  * Software distributed under the License is distributed on an "AS IS" basis,
      11             :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12             :  * for the specific language governing rights and limitations under the
      13             :  * License.
      14             :  *
      15             :  * Major Contributor(s):
      16             :  * Copyright (C) 2012 Brennan Vincent <brennanv@email.arizona.edu>
      17             :  *
      18             :  * All Rights Reserved.
      19             :  *
      20             :  * For minor contributions see the git repository.
      21             :  *
      22             :  * Alternatively, the contents of this file may be used under the terms of
      23             :  * either the GNU General Public License Version 2 or later (the "GPLv2+"), or
      24             :  * the GNU Lesser General Public License Version 2 or later (the "LGPLv2+"),
      25             :  * in which case the provisions of the GPLv2+ or the LGPLv2+ are applicable
      26             :  * instead of those above.
      27             :  */
      28             : 
      29             : 
      30             : //TODO : Adjust handles, glue points
      31             : 
      32             : #include "VectorTransformation2D.h"
      33             : #include <math.h>
      34             : 
      35           0 : libmspub::VectorTransformation2D::VectorTransformation2D() : m_m11(1), m_m12(0), m_m21(0), m_m22(1), m_x(0), m_y(0)
      36             : {
      37           0 : }
      38             : 
      39             : //We choose by convention to make function composition LEFT-multiplication, rather than right.
      40           0 : libmspub::VectorTransformation2D libmspub::operator*(const VectorTransformation2D &l, const VectorTransformation2D &r)
      41             : {
      42           0 :   VectorTransformation2D ret;
      43           0 :   ret.m_m11 = l.m_m11 * r.m_m11 + l.m_m12 * r.m_m21;
      44           0 :   ret.m_m12 = l.m_m11 * r.m_m12 + l.m_m12 * r.m_m22;
      45           0 :   ret.m_m21 = l.m_m21 * r.m_m11 + l.m_m22 * r.m_m21;
      46           0 :   ret.m_m22 = l.m_m21 * r.m_m12 + l.m_m22 * r.m_m22;
      47           0 :   ret.m_x   = l.m_m11 * r.m_x   + l.m_m12 * r.m_y + l.m_x;
      48           0 :   ret.m_y   = l.m_m21 * r.m_x   + l.m_m22 * r.m_y + l.m_y;
      49           0 :   return ret;
      50             : }
      51             : 
      52           0 : libmspub::VectorTransformation2D libmspub::VectorTransformation2D::fromFlips(bool flipH, bool flipV)
      53             : {
      54           0 :   VectorTransformation2D ret;
      55           0 :   ret.m_m21 = ret.m_m12 = 0;
      56           0 :   ret.m_m11 = flipH ? -1 : 1;
      57           0 :   ret.m_m22 = flipV ? -1 : 1;
      58           0 :   return ret;
      59             : }
      60             : 
      61           0 : libmspub::VectorTransformation2D libmspub::VectorTransformation2D::fromTranslate(double x, double y)
      62             : {
      63           0 :   VectorTransformation2D ret;
      64           0 :   ret.m_m11 = ret.m_m22 = 1;
      65           0 :   ret.m_m21 = ret.m_m12 = 0;
      66           0 :   ret.m_x = x;
      67           0 :   ret.m_y = y;
      68           0 :   return ret;
      69             : }
      70             : 
      71           0 : libmspub::VectorTransformation2D libmspub::VectorTransformation2D::fromCounterRadians(double theta)
      72             : {
      73           0 :   VectorTransformation2D ret;
      74           0 :   ret.m_m11 = cos(theta);
      75           0 :   ret.m_m12 = -sin(theta);
      76           0 :   ret.m_m21 = sin(theta);
      77           0 :   ret.m_m22 = cos(theta);
      78           0 :   return ret;
      79             : }
      80             : 
      81           0 : libmspub::Vector2D libmspub::VectorTransformation2D::transform(Vector2D v) const
      82             : {
      83           0 :   double x = m_m11 * v.m_x + m_m12 * v.m_y + m_x;
      84           0 :   double y = m_m21 * v.m_x + m_m22 * v.m_y + m_y;
      85           0 :   return Vector2D(x, y);
      86             : }
      87             : 
      88           0 : libmspub::Vector2D libmspub::VectorTransformation2D::transformWithOrigin(Vector2D v, Vector2D origin) const
      89             : {
      90           0 :   return transform(v - origin) + origin;
      91             : }
      92             : 
      93           0 : libmspub::Vector2D libmspub::operator+(const Vector2D &l, const Vector2D &r)
      94             : {
      95           0 :   double x = l.m_x + r.m_x;
      96           0 :   double y = l.m_y + r.m_y;
      97           0 :   return Vector2D(x, y);
      98             : }
      99             : 
     100           0 : libmspub::Vector2D libmspub::operator-(const Vector2D &l, const Vector2D &r)
     101             : {
     102           0 :   double x = l.m_x - r.m_x;
     103           0 :   double y = l.m_y - r.m_y;
     104           0 :   return Vector2D(x, y);
     105             : }
     106             : 
     107           0 : double libmspub::VectorTransformation2D::getRotation() const
     108             : {
     109           0 :   if (fabs(getHorizontalScaling()) > 0.0001)
     110             :   {
     111           0 :     return atan2(m_m21, m_m11);
     112             :   }
     113           0 :   if (fabs(getVerticalScaling()) > 0.0001)
     114             :   {
     115           0 :     return atan2(-m_m12, m_m22);
     116             :   }
     117           0 :   return 0;
     118             : }
     119             : 
     120           0 : double libmspub::VectorTransformation2D::getHorizontalScaling() const
     121             : {
     122           0 :   return m_m11 * m_m11 + m_m21 * m_m21;
     123             : }
     124             : 
     125           0 : double libmspub::VectorTransformation2D::getVerticalScaling() const
     126             : {
     127           0 :   return m_m12 * m_m12 + m_m22 * m_m22;
     128             : }
     129             : 
     130           0 : bool libmspub::VectorTransformation2D::orientationReversing() const
     131             : {
     132             :   // Is the determinant negative?
     133           0 :   return m_m11 * m_m22 < m_m12 * m_m21;
     134             : }
     135             : /* vim:set shiftwidth=2 softtabstop=2 expandtab: */