summaryrefslogtreecommitdiffstats
path: root/tqtinterface/qt4/include/private/qt4_qbezier_p.h
diff options
context:
space:
mode:
Diffstat (limited to 'tqtinterface/qt4/include/private/qt4_qbezier_p.h')
-rw-r--r--tqtinterface/qt4/include/private/qt4_qbezier_p.h274
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
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-16 04:24:22 +0000