gecko-dev/gfx/thebes/gfxQuad.h

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * 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 GFX_QUAD_H
#define GFX_QUAD_H

#include "gfxTypes.h"
#include "gfxRect.h"
#include "gfxLineSegment.h"
#include <algorithm>

struct gfxQuad {
  gfxQuad(const gfxPoint& aOne, const gfxPoint& aTwo, const gfxPoint& aThree,
          const gfxPoint& aFour) {
    mPoints[0] = aOne;
    mPoints[1] = aTwo;
    mPoints[2] = aThree;
    mPoints[3] = aFour;
  }

  bool Contains(const gfxPoint& aPoint) {
    return (gfxLineSegment(mPoints[0], mPoints[1])
                .PointsOnSameSide(aPoint, mPoints[2]) &&
            gfxLineSegment(mPoints[1], mPoints[2])
                .PointsOnSameSide(aPoint, mPoints[3]) &&
            gfxLineSegment(mPoints[2], mPoints[3])
                .PointsOnSameSide(aPoint, mPoints[0]) &&
            gfxLineSegment(mPoints[3], mPoints[0])
                .PointsOnSameSide(aPoint, mPoints[1]));
  }

  gfxRect GetBounds() {
    gfxFloat min_x, max_x;
    gfxFloat min_y, max_y;

    min_x = max_x = mPoints[0].x;
    min_y = max_y = mPoints[0].y;

    for (int i = 1; i < 4; i++) {
      min_x = std::min(mPoints[i].x, min_x);
      max_x = std::max(mPoints[i].x, max_x);
      min_y = std::min(mPoints[i].y, min_y);
      max_y = std::max(mPoints[i].y, max_y);
    }
    return gfxRect(min_x, min_y, max_x - min_x, max_y - min_y);
  }

  gfxPoint mPoints[4];
};

#endif /* GFX_QUAD_H */