f9f395c28b
Updated version of LGPL and FDL licenseheaders. Apply release phase licenseheaders for all source files. Reviewed-by: Trust Me
94 lines
3.1 KiB
C++
94 lines
3.1 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the test suite of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** GNU Lesser General Public License Usage
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** This file may be used under the terms of the GNU Lesser General Public
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** License version 2.1 as published by the Free Software Foundation and
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** appearing in the file LICENSE.LGPL included in the packaging of this
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** file. Please review the following information to ensure the GNU Lesser
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** General Public License version 2.1 requirements will be met:
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU General
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** Public License version 3.0 as published by the Free Software Foundation
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** and appearing in the file LICENSE.GPL included in the packaging of this
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** file. Please review the following information to ensure the GNU General
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** Public License version 3.0 requirements will be met:
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** http://www.gnu.org/copyleft/gpl.html.
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**
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** Other Usage
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** Alternatively, this file may be used in accordance with the terms and
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** conditions contained in a signed written agreement between you and Nokia.
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "utils.h"
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#include <assert.h>
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#include <qglobal.h>
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#include "qnum.h"
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#define FloatToXFixed(i) (int)((i) * 65536)
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#define IntToXFixed(i) ((i) << 16)
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static double compute_x_at(XFixed y, XPointFixed p1, XPointFixed p2)
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{
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double d = XFixedToDouble(p2.x - p1.x);
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return
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XFixedToDouble(p1.x) + d*XFixedToDouble(y - p1.y)/XFixedToDouble(p2.y - p1.y);
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}
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double compute_area(XTrapezoid *trap)
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{
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double x1 = compute_x_at(trap->top, trap->left.p1, trap->left.p2);
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double x2 = compute_x_at(trap->top, trap->right.p1, trap->right.p2);
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double x3 = compute_x_at(trap->bottom, trap->left.p1, trap->left.p2);
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double x4 = compute_x_at(trap->bottom, trap->right.p1, trap->right.p2);
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double top = XFixedToDouble(trap->top);
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double bottom = XFixedToDouble(trap->bottom);
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double h = bottom - top;
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double top_base = x2 - x1;
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double bottom_base = x4 - x3;
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if ((top_base < 0 && bottom_base > 0)
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|| (top_base > 0 && bottom_base < 0)) {
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double y0 = top_base*h/(top_base - bottom_base) + top;
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double area = qAbs(top_base * (y0 - top) / 2.);
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area += qAbs(bottom_base * (bottom - y0) /2.);
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return area;
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}
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return 0.5 * h * qAbs(top_base + bottom_base);
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}
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double compute_area_for_x(const QVector<XTrapezoid> &traps)
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{
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double area = 0;
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for (int i = 0; i < traps.size(); ++i) {
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XTrapezoid trap = traps[i];
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area += compute_area(&trap);
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}
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return area;
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}
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