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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QTRIANGULATINGSTROKER_P_H
#define QTRIANGULATINGSTROKER_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtGui/private/qtguiglobal_p.h>
#include <private/qdatabuffer_p.h>
#include <qvarlengtharray.h>
#include <private/qvectorpath_p.h>
#include <private/qbezier_p.h>
#include <private/qnumeric_p.h>
#include <private/qmath_p.h>
QT_BEGIN_NAMESPACE
class Q_GUI_EXPORT QTriangulatingStroker
{
public:
QTriangulatingStroker() : m_vertices(0), m_cx(0), m_cy(0), m_nvx(0), m_nvy(0), m_width(1), m_miter_limit(2),
m_roundness(0), m_sin_theta(0), m_cos_theta(0), m_inv_scale(1), m_curvyness_mul(1), m_curvyness_add(0),
m_join_style(Qt::BevelJoin), m_cap_style(Qt::SquareCap) {}
void process(const QVectorPath &path, const QPen &pen, const QRectF &clip, QPainter::RenderHints hints);
inline int vertexCount() const { return m_vertices.size(); }
inline const float *vertices() const { return m_vertices.data(); }
inline void setInvScale(qreal invScale) { m_inv_scale = invScale; }
private:
inline void emitLineSegment(float x, float y, float nx, float ny);
void moveTo(const qreal *pts);
inline void lineTo(const qreal *pts);
void cubicTo(const qreal *pts);
void join(const qreal *pts);
inline void normalVector(float x1, float y1, float x2, float y2, float *nx, float *ny);
void endCap(const qreal *pts);
void arcPoints(float cx, float cy, float fromX, float fromY, float toX, float toY, QVarLengthArray<float> &points);
void endCapOrJoinClosed(const qreal *start, const qreal *cur, bool implicitClose, bool endsAtStart);
QDataBuffer<float> m_vertices;
float m_cx, m_cy; // current points
float m_nvx, m_nvy; // normal vector...
float m_width;
qreal m_miter_limit;
int m_roundness; // Number of line segments in a round join
qreal m_sin_theta; // sin(m_roundness / 360);
qreal m_cos_theta; // cos(m_roundness / 360);
qreal m_inv_scale;
float m_curvyness_mul;
float m_curvyness_add;
Qt::PenJoinStyle m_join_style;
Qt::PenCapStyle m_cap_style;
};
class Q_GUI_EXPORT QDashedStrokeProcessor
{
public:
QDashedStrokeProcessor();
void process(const QVectorPath &path, const QPen &pen, const QRectF &clip, QPainter::RenderHints hints);
inline void addElement(QPainterPath::ElementType type, qreal x, qreal y) {
m_points.add(x);
m_points.add(y);
m_types.add(type);
}
inline int elementCount() const { return m_types.size(); }
inline qreal *points() const { return m_points.data(); }
inline QPainterPath::ElementType *elementTypes() const { return m_types.data(); }
inline void setInvScale(qreal invScale) { m_inv_scale = invScale; }
private:
QDataBuffer<qreal> m_points;
QDataBuffer<QPainterPath::ElementType> m_types;
QDashStroker m_dash_stroker;
qreal m_inv_scale;
};
inline void QTriangulatingStroker::normalVector(float x1, float y1, float x2, float y2,
float *nx, float *ny)
{
float dx = x2 - x1;
float dy = y2 - y1;
Q_ASSERT(dx != 0 || dy != 0);
float pw;
if (dx == 0)
pw = m_width / std::abs(dy);
else if (dy == 0)
pw = m_width / std::abs(dx);
else
pw = m_width / std::sqrt(dx*dx + dy*dy);
*nx = -dy * pw;
*ny = dx * pw;
}
inline void QTriangulatingStroker::emitLineSegment(float x, float y, float vx, float vy)
{
m_vertices.add(x + vx);
m_vertices.add(y + vy);
m_vertices.add(x - vx);
m_vertices.add(y - vy);
}
void QTriangulatingStroker::lineTo(const qreal *pts)
{
emitLineSegment(pts[0], pts[1], m_nvx, m_nvy);
m_cx = pts[0];
m_cy = pts[1];
}
QT_END_NAMESPACE
#endif
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