src/jelly/ClosedShape.cpp

   1 /*
   2  * Copyright (c) 2007 Walaber
   3  * Modified by Ketmar // Invisible Vector
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a copy
   6  * of this software and associated documentation files (the "Software"), to deal
   7  * in the Software without restriction, including without limitation the rights
   8  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   9  * copies of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  21  * THE SOFTWARE.
  22  */
  23 #include "ClosedShape.h"
  24
  25 #include "VectorTools.h"
  26
  27
  28 namespace JellyPhysics {
  29
  30 void ClosedShape::begin () {
  31   mLocalVertices.clear();
  32 }
  33
  34
  35 int ClosedShape::addVertex (const Vector2 &vec) {
  36   mLocalVertices.push_back(vec);
  37   return mLocalVertices.size();
  38 }
  39
  40
  41 void ClosedShape::finish (bool recenter) {
  42   if (recenter) {
  43     // find the average location of all of the vertices, this is our geometrical center
  44     Vector2 center = Vector2::Zero;
  45     unsigned int c = mLocalVertices.size();
  46     for (unsigned int i = 0; i < c; ++i) center += mLocalVertices[i];
  47     center /= (float)c;
  48     // now subtract this from each element, to get proper "local" coordinates
  49     for (unsigned int i = 0; i < c; ++i) mLocalVertices[i] -= center;
  50   }
  51 }
  52
  53
  54 Vector2List ClosedShape::transformVertices (const Vector2 &worldPos, float angleInRadians, const Vector2 &scale) const {
  55   Vector2List ret = mLocalVertices;
  56   Vector2 v;
  57   unsigned int c = ret.size();
  58   for (unsigned int i = 0; i < c; ++i) {
  59     // rotate the point, and then translate
  60     v = ret[i]*scale;
  61     v = rotateVector(v, angleInRadians);
  62     v += worldPos;
  63     ret[i] = v;
  64   }
  65   return ret;
  66 }
  67
  68
  69 void ClosedShape::transformVertices (const Vector2 &worldPos, float angleInRadians, const Vector2 &scale, Vector2List &outList) const {
  70   float c = cosf(angleInRadians);
  71   float s = sinf(angleInRadians);
  72   Vector2List::iterator out = outList.begin();
  73   for (Vector2List::const_iterator it = mLocalVertices.begin(); it != mLocalVertices.end(); ++it, ++out) {
  74     // rotate the point, and then translate
  75     Vector2 v =(*it)*scale;
  76     v = rotateVector(v, c, s);
  77     v += worldPos;
  78     (*out) = v;
  79   }
  80 }
  81
  82 }