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39
40#ifndef QTRIANGULATINGSTROKER_P_H
41#define QTRIANGULATINGSTROKER_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists purely as an
48// implementation detail. This header file may change from version to
49// version without notice, or even be removed.
50//
51// We mean it.
52//
53
54#include <QtGui/private/qtguiglobal_p.h>
55#include <private/qdatabuffer_p.h>
56#include <qvarlengtharray.h>
57#include <private/qvectorpath_p.h>
58#include <private/qbezier_p.h>
59#include <private/qnumeric_p.h>
60#include <private/qmath_p.h>
61
62QT_BEGIN_NAMESPACE
63
64class Q_GUI_EXPORT QTriangulatingStroker
65{
66public:
67 QTriangulatingStroker() : m_vertices(0), m_cx(0), m_cy(0), m_nvx(0), m_nvy(0), m_width(1), m_miter_limit(2),
68 m_roundness(0), m_sin_theta(0), m_cos_theta(0), m_inv_scale(1), m_curvyness_mul(1), m_curvyness_add(0),
69 m_join_style(Qt::BevelJoin), m_cap_style(Qt::SquareCap) {}
70
71 void process(const QVectorPath &path, const QPen &pen, const QRectF &clip, QPainter::RenderHints hints);
72
73 inline int vertexCount() const { return m_vertices.size(); }
74 inline const float *vertices() const { return m_vertices.data(); }
75
76 inline void setInvScale(qreal invScale) { m_inv_scale = invScale; }
77
78private:
79 inline void emitLineSegment(float x, float y, float nx, float ny);
80 void moveTo(const qreal *pts);
81 inline void lineTo(const qreal *pts);
82 void cubicTo(const qreal *pts);
83 void join(const qreal *pts);
84 inline void normalVector(float x1, float y1, float x2, float y2, float *nx, float *ny);
85 void endCap(const qreal *pts);
86 void arcPoints(float cx, float cy, float fromX, float fromY, float toX, float toY, QVarLengthArray<float> &points);
87 void endCapOrJoinClosed(const qreal *start, const qreal *cur, bool implicitClose, bool endsAtStart);
88
89
90 QDataBuffer<float> m_vertices;
91
92 float m_cx, m_cy; // current points
93 float m_nvx, m_nvy; // normal vector...
94 float m_width;
95 qreal m_miter_limit;
96
97 int m_roundness; // Number of line segments in a round join
98 qreal m_sin_theta; // sin(m_roundness / 360);
99 qreal m_cos_theta; // cos(m_roundness / 360);
100 qreal m_inv_scale;
101 float m_curvyness_mul;
102 float m_curvyness_add;
103
104 Qt::PenJoinStyle m_join_style;
105 Qt::PenCapStyle m_cap_style;
106};
107
108class Q_GUI_EXPORT QDashedStrokeProcessor
109{
110public:
111 QDashedStrokeProcessor();
112
113 void process(const QVectorPath &path, const QPen &pen, const QRectF &clip, QPainter::RenderHints hints);
114
115 inline void addElement(QPainterPath::ElementType type, qreal x, qreal y) {
116 m_points.add(t: x);
117 m_points.add(t: y);
118 m_types.add(t: type);
119 }
120
121 inline int elementCount() const { return m_types.size(); }
122 inline qreal *points() const { return m_points.data(); }
123 inline QPainterPath::ElementType *elementTypes() const { return m_types.data(); }
124
125 inline void setInvScale(qreal invScale) { m_inv_scale = invScale; }
126
127private:
128 QDataBuffer<qreal> m_points;
129 QDataBuffer<QPainterPath::ElementType> m_types;
130 QDashStroker m_dash_stroker;
131 qreal m_inv_scale;
132};
133
134inline void QTriangulatingStroker::normalVector(float x1, float y1, float x2, float y2,
135 float *nx, float *ny)
136{
137 float dx = x2 - x1;
138 float dy = y2 - y1;
139 Q_ASSERT(dx != 0 || dy != 0);
140
141 float pw;
142
143 if (dx == 0)
144 pw = m_width / std::abs(x: dy);
145 else if (dy == 0)
146 pw = m_width / std::abs(x: dx);
147 else
148 pw = m_width / std::sqrt(x: dx*dx + dy*dy);
149
150 *nx = -dy * pw;
151 *ny = dx * pw;
152}
153
154inline void QTriangulatingStroker::emitLineSegment(float x, float y, float vx, float vy)
155{
156 m_vertices.add(t: x + vx);
157 m_vertices.add(t: y + vy);
158 m_vertices.add(t: x - vx);
159 m_vertices.add(t: y - vy);
160}
161
162void QTriangulatingStroker::lineTo(const qreal *pts)
163{
164 emitLineSegment(x: pts[0], y: pts[1], vx: m_nvx, vy: m_nvy);
165 m_cx = pts[0];
166 m_cy = pts[1];
167}
168
169QT_END_NAMESPACE
170
171#endif
172

source code of qtbase/src/gui/painting/qtriangulatingstroker_p.h