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Diffstat (limited to 'tqtinterface/qt4/include/private/qt4_qbezier_p.h')
-rw-r--r-- | tqtinterface/qt4/include/private/qt4_qbezier_p.h | 274 |
1 files changed, 0 insertions, 274 deletions
diff --git a/tqtinterface/qt4/include/private/qt4_qbezier_p.h b/tqtinterface/qt4/include/private/qt4_qbezier_p.h deleted file mode 100644 index a76d94b..0000000 --- a/tqtinterface/qt4/include/private/qt4_qbezier_p.h +++ /dev/null @@ -1,274 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). -** All rights reserved. -** Contact: Nokia Corporation (qt-info@nokia.com) -** -** This file is part of the QtGui module of the Qt Toolkit. -** -** $QT_BEGIN_LICENSE:LGPL$ -** Commercial Usage -** Licensees holding valid Qt Commercial licenses may use this file in -** accordance with the Qt Commercial License Agreement provided with the -** Software or, alternatively, in accordance with the terms contained in -** a written agreement between you and Nokia. -** -** GNU Lesser General Public License Usage -** Alternatively, this file may be used under the terms of the GNU Lesser -** General Public License version 2.1 as published by the Free Software -** Foundation and appearing in the file LICENSE.LGPL included in the -** packaging of this file. Please review the following information to -** ensure the GNU Lesser General Public License version 2.1 requirements -** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. -** -** In addition, as a special exception, Nokia gives you certain additional -** rights. These rights are described in the Nokia Qt LGPL Exception -** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. -** -** GNU General Public License Usage -** Alternatively, this file may be used under the terms of the GNU -** General Public License version 3.0 as published by the Free Software -** Foundation and appearing in the file LICENSE.GPL included in the -** packaging of this file. Please review the following information to -** ensure the GNU General Public License version 3.0 requirements will be -** met: http://www.gnu.org/copyleft/gpl.html. -** -** If you have questions regarding the use of this file, please contact -** Nokia at qt-info@nokia.com. -** $QT_END_LICENSE$ -** -****************************************************************************/ - -#ifndef QBEZIER_P_H -#define QBEZIER_P_H - -// -// W A R N I N G -// ------------- -// -// This file is not part of the Qt API. It exists for the convenience -// of other Qt classes. This header file may change from version to -// version without notice, or even be removed. -// -// We mean it. -// - -#include "QtCore/qpoint.h" -#include "QtCore/qline.h" -#include "QtCore/qrect.h" -#include "QtCore/qvector.h" -#include "QtCore/qlist.h" -#include "QtCore/qpair.h" -#include "QtGui/qtransform.h" - -QT_BEGIN_NAMESPACE - -class QPolygonF; - -class Q_GUI_EXPORT QBezier -{ -public: - static QBezier fromPoints(const QPointF &p1, const QPointF &p2, - const QPointF &p3, const QPointF &p4); - - static void coefficients(qreal t, qreal &a, qreal &b, qreal &c, qreal &d); - - inline QPointF pointAt(qreal t) const; - inline QPointF normalVector(qreal t) const; - - inline QPointF derivedAt(qreal t) const; - inline QPointF secondDerivedAt(qreal t) const; - - QPolygonF toPolygon(qreal bezier_flattening_threshold = 0.5) const; - void addToPolygon(QPolygonF *p, qreal bezier_flattening_threshold = 0.5) const; - - QRectF bounds() const; - qreal length(qreal error = 0.01) const; - void addIfClose(qreal *length, qreal error) const; - - qreal tAtLength(qreal len) const; - - int stationaryYPoints(qreal &t0, qreal &t1) const; - qreal tForY(qreal t0, qreal t1, qreal y) const; - - QPointF pt1() const { return QPointF(x1, y1); } - QPointF pt2() const { return QPointF(x2, y2); } - QPointF pt3() const { return QPointF(x3, y3); } - QPointF pt4() const { return QPointF(x4, y4); } - - QBezier mapBy(const QTransform &transform) const; - - inline QPointF midPoint() const; - inline QLineF midTangent() const; - - inline QLineF startTangent() const; - inline QLineF endTangent() const; - - inline void parameterSplitLeft(qreal t, QBezier *left); - inline void split(QBezier *firstHalf, QBezier *secondHalf) const; - - int shifted(QBezier *curveSegments, int maxSegmets, - qreal offset, float threshold) const; - - QBezier bezierOnInterval(qreal t0, qreal t1) const; - QBezier getSubRange(qreal t0, qreal t1) const; - - qreal x1, y1, x2, y2, x3, y3, x4, y4; -}; - -inline QPointF QBezier::midPoint() const -{ - return QPointF((x1 + x4 + 3*(x2 + x3))/8., (y1 + y4 + 3*(y2 + y3))/8.); -} - -inline QLineF QBezier::midTangent() const -{ - QPointF mid = midPoint(); - QLineF dir(QLineF(x1, y1, x2, y2).pointAt(0.5), QLineF(x3, y3, x4, y4).pointAt(0.5)); - return QLineF(mid.x() - dir.dx(), mid.y() - dir.dy(), - mid.x() + dir.dx(), mid.y() + dir.dy()); -} - -inline QLineF QBezier::startTangent() const -{ - QLineF tangent(pt1(), pt2()); - if (tangent.isNull()) - tangent = QLineF(pt1(), pt3()); - if (tangent.isNull()) - tangent = QLineF(pt1(), pt4()); - return tangent; -} - -inline QLineF QBezier::endTangent() const -{ - QLineF tangent(pt4(), pt3()); - if (tangent.isNull()) - tangent = QLineF(pt4(), pt2()); - if (tangent.isNull()) - tangent = QLineF(pt4(), pt1()); - return tangent; -} - -inline void QBezier::coefficients(qreal t, qreal &a, qreal &b, qreal &c, qreal &d) -{ - qreal m_t = 1. - t; - b = m_t * m_t; - c = t * t; - d = c * t; - a = b * m_t; - b *= 3. * t; - c *= 3. * m_t; -} - -inline QPointF QBezier::pointAt(qreal t) const -{ -#if 1 - qreal a, b, c, d; - coefficients(t, a, b, c, d); - return QPointF(a*x1 + b*x2 + c*x3 + d*x4, a*y1 + b*y2 + c*y3 + d*y4); -#else - // numerically more stable: - qreal m_t = 1. - t; - qreal a = x1*m_t + x2*t; - qreal b = x2*m_t + x3*t; - qreal c = x3*m_t + x4*t; - a = a*m_t + b*t; - b = b*m_t + c*t; - qreal x = a*m_t + b*t; - qreal a = y1*m_t + y2*t; - qreal b = y2*m_t + y3*t; - qreal c = y3*m_t + y4*t; - a = a*m_t + b*t; - b = b*m_t + c*t; - qreal y = a*m_t + b*t; - return QPointF(x, y); -#endif -} - -inline QPointF QBezier::normalVector(qreal t) const -{ - qreal m_t = 1. - t; - qreal a = m_t * m_t; - qreal b = t * m_t; - qreal c = t * t; - - return QPointF((y2-y1) * a + (y3-y2) * b + (y4-y3) * c, -(x2-x1) * a - (x3-x2) * b - (x4-x3) * c); -} - -inline QPointF QBezier::derivedAt(qreal t) const -{ - // p'(t) = 3 * (-(1-2t+t^2) * p0 + (1 - 4 * t + 3 * t^2) * p1 + (2 * t - 3 * t^2) * p2 + t^2 * p3) - - qreal m_t = 1. - t; - - qreal d = t * t; - qreal a = -m_t * m_t; - qreal b = 1 - 4 * t + 3 * d; - qreal c = 2 * t - 3 * d; - - return 3 * QPointF(a * x1 + b * x2 + c * x3 + d * x4, - a * y1 + b * y2 + c * y3 + d * y4); -} - -inline QPointF QBezier::secondDerivedAt(qreal t) const -{ - qreal a = 2. - 2. * t; - qreal b = -4 + 6 * t; - qreal c = 2 - 6 * t; - qreal d = 2 * t; - - return 3 * QPointF(a * x1 + b * x2 + c * x3 + d * x4, - a * y1 + b * y2 + c * y3 + d * y4); -} - -inline void QBezier::split(QBezier *firstHalf, QBezier *secondHalf) const -{ - Q_ASSERT(firstHalf); - Q_ASSERT(secondHalf); - - qreal c = (x2 + x3)*.5; - firstHalf->x2 = (x1 + x2)*.5; - secondHalf->x3 = (x3 + x4)*.5; - firstHalf->x1 = x1; - secondHalf->x4 = x4; - firstHalf->x3 = (firstHalf->x2 + c)*.5; - secondHalf->x2 = (secondHalf->x3 + c)*.5; - firstHalf->x4 = secondHalf->x1 = (firstHalf->x3 + secondHalf->x2)*.5; - - c = (y2 + y3)/2; - firstHalf->y2 = (y1 + y2)*.5; - secondHalf->y3 = (y3 + y4)*.5; - firstHalf->y1 = y1; - secondHalf->y4 = y4; - firstHalf->y3 = (firstHalf->y2 + c)*.5; - secondHalf->y2 = (secondHalf->y3 + c)*.5; - firstHalf->y4 = secondHalf->y1 = (firstHalf->y3 + secondHalf->y2)*.5; -} - -inline void QBezier::parameterSplitLeft(qreal t, QBezier *left) -{ - left->x1 = x1; - left->y1 = y1; - - left->x2 = x1 + t * ( x2 - x1 ); - left->y2 = y1 + t * ( y2 - y1 ); - - left->x3 = x2 + t * ( x3 - x2 ); // temporary holding spot - left->y3 = y2 + t * ( y3 - y2 ); // temporary holding spot - - x3 = x3 + t * ( x4 - x3 ); - y3 = y3 + t * ( y4 - y3 ); - - x2 = left->x3 + t * ( x3 - left->x3); - y2 = left->y3 + t * ( y3 - left->y3); - - left->x3 = left->x2 + t * ( left->x3 - left->x2 ); - left->y3 = left->y2 + t * ( left->y3 - left->y2 ); - - left->x4 = x1 = left->x3 + t * (x2 - left->x3); - left->y4 = y1 = left->y3 + t * (y2 - left->y3); -} - -QT_END_NAMESPACE - -#endif // QBEZIER_P_H |