gfx/thebes/gfxQuad.h

   1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef GFX_QUAD_H
   7 #define GFX_QUAD_H
   8
   9 #include "gfxTypes.h"
  10 #include "gfxRect.h"
  11 #include "gfxLineSegment.h"
  12 #include <algorithm>
  13
  14 struct gfxQuad {
  15   gfxQuad(const gfxPoint& aOne, const gfxPoint& aTwo, const gfxPoint& aThree,
  16           const gfxPoint& aFour) {
  17     mPoints[0] = aOne;
  18     mPoints[1] = aTwo;
  19     mPoints[2] = aThree;
  20     mPoints[3] = aFour;
  21   }
  22
  23   bool Contains(const gfxPoint& aPoint) {
  24     return (gfxLineSegment(mPoints[0], mPoints[1])
  25                 .PointsOnSameSide(aPoint, mPoints[2]) &&
  26             gfxLineSegment(mPoints[1], mPoints[2])
  27                 .PointsOnSameSide(aPoint, mPoints[3]) &&
  28             gfxLineSegment(mPoints[2], mPoints[3])
  29                 .PointsOnSameSide(aPoint, mPoints[0]) &&
  30             gfxLineSegment(mPoints[3], mPoints[0])
  31                 .PointsOnSameSide(aPoint, mPoints[1]));
  32   }
  33
  34   gfxRect GetBounds() {
  35     gfxFloat min_x, max_x;
  36     gfxFloat min_y, max_y;
  37
  38     min_x = max_x = mPoints[0].x;
  39     min_y = max_y = mPoints[0].y;
  40
  41     for (int i = 1; i < 4; i++) {
  42       min_x = std::min(mPoints[i].x.value, min_x);
  43       max_x = std::max(mPoints[i].x.value, max_x);
  44       min_y = std::min(mPoints[i].y.value, min_y);
  45       max_y = std::max(mPoints[i].y.value, max_y);
  46     }
  47     return gfxRect(min_x, min_y, max_x - min_x, max_y - min_y);
  48   }
  49
  50   gfxPoint mPoints[4];
  51 };
  52
  53 #endif /* GFX_QUAD_H */