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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QQUADPATH_P_H
#define QQUADPATH_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of a number of Qt sources files. This header file may change from
// version to version without notice, or even be removed.
//
// We mean it.
//
#include <QtCore/qrect.h>
#include <QtCore/qlist.h>
#include <QtCore/qdebug.h>
#include <QtGui/qvector2d.h>
#include <QtGui/qpainterpath.h>
QT_BEGIN_NAMESPACE
class QQuadPath
{
public:
class Element
{
public:
Element ()
: m_isSubpathStart(false), m_isSubpathEnd(false), m_isLine(false)
{
}
bool isSubpathStart() const
{
return m_isSubpathStart;
}
bool isSubpathEnd() const
{
return m_isSubpathEnd;
}
bool isLine() const
{
return m_isLine;
}
bool isConvex() const
{
return m_curvatureFlags & Convex;
}
QVector2D startPoint() const
{
return sp;
}
QVector2D controlPoint() const
{
return cp;
}
QVector2D endPoint() const
{
return ep;
}
QVector2D midPoint() const
{
return isLine() ? 0.5f * (sp + ep) : (0.25f * sp) + (0.5f * cp) + (0.25 * ep);
}
int childCount() const { return m_numChildren; }
int indexOfChild(int childNumber) const
{
Q_ASSERT(childNumber >= 0 && childNumber < childCount());
return -(m_firstChildIndex + 1 + childNumber);
}
QVector2D pointAtFraction(float t) const;
QVector2D tangentAtFraction(float t) const
{
return isLine() ? (ep - sp) : ((1 - t) * 2 * (cp - sp)) + (t * 2 * (ep - cp));
}
QVector2D normalAtFraction(float t) const
{
const QVector2D tan = tangentAtFraction(t);
return QVector2D(-tan.y(), tan.x());
}
float extent() const;
void setAsConvex(bool isConvex)
{
if (isConvex)
m_curvatureFlags = Element::CurvatureFlags(m_curvatureFlags | Element::Convex);
else
m_curvatureFlags = Element::CurvatureFlags(m_curvatureFlags & ~Element::Convex);
}
bool isControlPointOnLeft() const
{
return isPointOnLeft(cp, sp, ep);
}
private:
int intersectionsAtY(float y, float *fractions) const;
enum CurvatureFlags : quint8 {
CurvatureUndetermined = 0,
FillOnRight = 1,
Convex = 2
};
QVector2D sp;
QVector2D cp;
QVector2D ep;
int m_firstChildIndex = 0;
quint8 m_numChildren = 0;
CurvatureFlags m_curvatureFlags = CurvatureUndetermined;
quint8 m_isSubpathStart : 1;
quint8 m_isSubpathEnd : 1;
quint8 m_isLine : 1;
friend class QQuadPath;
friend QDebug operator<<(QDebug, const QQuadPath::Element &);
};
void moveTo(const QVector2D &to)
{
subPathToStart = true;
currentPoint = to;
}
void lineTo(const QVector2D &to)
{
addElement({}, to, true);
}
void quadTo(const QVector2D &control, const QVector2D &to)
{
addElement(control, to);
}
Element &elementAt(int i)
{
return i < 0 ? m_childElements[-(i + 1)] : m_elements[i];
}
const Element &elementAt(int i) const
{
return i < 0 ? m_childElements[-(i + 1)] : m_elements[i];
}
int indexOfChildAt(int i, int childNumber) const
{
return elementAt(i).indexOfChild(childNumber);
}
QRectF controlPointRect() const;
Qt::FillRule fillRule() const { return m_fillRule; }
void setFillRule(Qt::FillRule rule) { m_fillRule = rule; }
void reserve(int size) { m_elements.reserve(size); }
int elementCount() const { return m_elements.size(); }
bool isEmpty() const { return m_elements.size() == 0; }
int elementCountRecursive() const;
static QQuadPath fromPainterPath(const QPainterPath &path);
QPainterPath toPainterPath() const;
QQuadPath subPathsClosed() const;
void addCurvatureData();
QQuadPath flattened() const;
QQuadPath dashed(qreal lineWidth, const QList<qreal> &dashPattern, qreal dashOffset = 0) const;
void splitElementAt(int index);
bool contains(const QVector2D &point) const;
template<typename Func>
void iterateChildrenOf(Element &e, Func &&lambda)
{
const int lastChildIndex = e.m_firstChildIndex + e.childCount() - 1;
for (int i = e.m_firstChildIndex; i <= lastChildIndex; i++) {
Element &c = m_childElements[i];
if (c.childCount() > 0)
iterateChildrenOf(c, lambda);
else
lambda(c);
}
}
template<typename Func>
void iterateChildrenOf(const Element &e, Func &&lambda) const
{
const int lastChildIndex = e.m_firstChildIndex + e.childCount() - 1;
for (int i = e.m_firstChildIndex; i <= lastChildIndex; i++) {
const Element &c = m_childElements[i];
if (c.childCount() > 0)
iterateChildrenOf(c, lambda);
else
lambda(c);
}
}
template<typename Func>
void iterateElements(Func &&lambda)
{
for (auto &e : m_elements) {
if (e.childCount() > 0)
iterateChildrenOf(e, lambda);
else
lambda(e);
}
}
template<typename Func>
void iterateElements(Func &&lambda) const
{
for (auto &e : m_elements) {
if (e.childCount() > 0)
iterateChildrenOf(e, lambda);
else
lambda(e);
}
}
static QVector2D closestPointOnLine(const QVector2D &p, const QVector2D &sp, const QVector2D &ep);
static bool isPointOnLeft(const QVector2D &p, const QVector2D &sp, const QVector2D &ep);
static bool isPointOnLine(const QVector2D &p, const QVector2D &sp, const QVector2D &ep);
static bool isPointNearLine(const QVector2D &p, const QVector2D &sp, const QVector2D &ep);
private:
void addElement(const QVector2D &control, const QVector2D &to, bool isLine = false);
Element::CurvatureFlags coordinateOrderOfElement(const Element &element) const;
friend QDebug operator<<(QDebug, const QQuadPath &);
bool subPathToStart = true;
Qt::FillRule m_fillRule = Qt::OddEvenFill;
QVector2D currentPoint;
QList<Element> m_elements;
QList<Element> m_childElements;
};
QDebug operator<<(QDebug, const QQuadPath::Element &);
QDebug operator<<(QDebug, const QQuadPath &);
QT_END_NAMESPACE
#endif
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