зеркало из https://github.com/mozilla/gecko-dev.git
88 строки
3.3 KiB
C
88 строки
3.3 KiB
C
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Corporation code.
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*
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* The Initial Developer of the Original Code is Oracle Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2005
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Matt Woodrow <mwoodrow@mozilla.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef GFX_QUAD_H
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#define GFX_QUAD_H
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#include "nsMathUtils.h"
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#include "mozilla/gfx/BaseSize.h"
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#include "mozilla/gfx/BasePoint.h"
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#include "nsSize.h"
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#include "nsPoint.h"
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#include "gfxTypes.h"
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static PRBool SameSideOfLine(const gfxPoint& aPoint1, const gfxPoint& aPoint2, const gfxPoint& aTest, const gfxPoint& aRef)
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{
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// Solve the equation y - aPoint1.y - ((aPoint2.y - aPoint1.y)/(aPoint2.x - aPoint1.x))(x - aPoint1.x) for both test and ref
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gfxFloat deltaY = (aPoint2.y - aPoint1.y);
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gfxFloat deltaX = (aPoint2.x - aPoint1.x);
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gfxFloat test = deltaX * (aTest.y - aPoint1.y) - deltaY * (aTest.x - aPoint1.x);
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gfxFloat ref = deltaX * (aRef.y - aPoint1.y) - deltaY * (aRef.x - aPoint1.x);
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// If both results have the same sign, then we're on the correct side of the line.
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// 0 (on the line) is always considered in.
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if ((test >= 0 && ref >= 0) || (test <= 0 && ref <= 0))
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return PR_TRUE;
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return PR_FALSE;
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}
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struct THEBES_API gfxQuad {
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gfxQuad(const gfxPoint& aOne, const gfxPoint& aTwo, const gfxPoint& aThree, const gfxPoint& aFour)
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{
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mPoints[0] = aOne;
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mPoints[1] = aTwo;
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mPoints[2] = aThree;
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mPoints[3] = aFour;
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}
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PRBool Contains(const gfxPoint& aPoint)
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{
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return (SameSideOfLine(mPoints[0], mPoints[1], aPoint, mPoints[2]) &&
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SameSideOfLine(mPoints[1], mPoints[2], aPoint, mPoints[3]) &&
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SameSideOfLine(mPoints[2], mPoints[3], aPoint, mPoints[0]) &&
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SameSideOfLine(mPoints[3], mPoints[0], aPoint, mPoints[1]));
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}
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gfxPoint mPoints[4];
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};
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#endif /* GFX_QUAD_H */
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