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7 ** This file is part of the examples of the Qt Toolkit. |
7 ** This file is part of the examples of the Qt Toolkit. |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
9 ** $QT_BEGIN_LICENSE:BSD$ |
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14 ** this package. |
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24 ** permission. |
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36 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." |
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38 ** $QT_END_LICENSE$ |
37 ** $QT_END_LICENSE$ |
39 ** |
38 ** |
40 ****************************************************************************/ |
39 ****************************************************************************/ |
41 |
40 |
42 #include <QPainter> |
41 #include <QPainter> |
47 #include <math.h> |
46 #include <math.h> |
48 |
47 |
49 static const double Pi = 3.14159265358979323846264338327950288419717; |
48 static const double Pi = 3.14159265358979323846264338327950288419717; |
50 static double TwoPi = 2.0 * Pi; |
49 static double TwoPi = 2.0 * Pi; |
51 |
50 |
|
51 //! [0] |
52 Edge::Edge(Node *sourceNode, Node *destNode) |
52 Edge::Edge(Node *sourceNode, Node *destNode) |
53 : arrowSize(10) |
53 : arrowSize(10) |
54 { |
54 { |
55 setAcceptedMouseButtons(0); |
55 setAcceptedMouseButtons(0); |
56 source = sourceNode; |
56 source = sourceNode; |
57 dest = destNode; |
57 dest = destNode; |
58 source->addEdge(this); |
58 source->addEdge(this); |
59 dest->addEdge(this); |
59 dest->addEdge(this); |
60 adjust(); |
60 adjust(); |
61 } |
61 } |
|
62 //! [0] |
62 |
63 |
63 Edge::~Edge() |
64 //! [1] |
64 { |
|
65 } |
|
66 |
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67 Node *Edge::sourceNode() const |
65 Node *Edge::sourceNode() const |
68 { |
66 { |
69 return source; |
67 return source; |
70 } |
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71 |
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72 void Edge::setSourceNode(Node *node) |
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73 { |
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74 source = node; |
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75 adjust(); |
|
76 } |
68 } |
77 |
69 |
78 Node *Edge::destNode() const |
70 Node *Edge::destNode() const |
79 { |
71 { |
80 return dest; |
72 return dest; |
81 } |
73 } |
|
74 //! [1] |
82 |
75 |
83 void Edge::setDestNode(Node *node) |
76 //! [2] |
84 { |
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85 dest = node; |
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86 adjust(); |
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87 } |
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88 |
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89 void Edge::adjust() |
77 void Edge::adjust() |
90 { |
78 { |
91 if (!source || !dest) |
79 if (!source || !dest) |
92 return; |
80 return; |
93 |
81 |
116 return QRectF(sourcePoint, QSizeF(destPoint.x() - sourcePoint.x(), |
106 return QRectF(sourcePoint, QSizeF(destPoint.x() - sourcePoint.x(), |
117 destPoint.y() - sourcePoint.y())) |
107 destPoint.y() - sourcePoint.y())) |
118 .normalized() |
108 .normalized() |
119 .adjusted(-extra, -extra, extra, extra); |
109 .adjusted(-extra, -extra, extra, extra); |
120 } |
110 } |
|
111 //! [3] |
121 |
112 |
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113 //! [4] |
122 void Edge::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *) |
114 void Edge::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *) |
123 { |
115 { |
124 if (!source || !dest) |
116 if (!source || !dest) |
125 return; |
117 return; |
126 |
118 |
127 QLineF line(sourcePoint, destPoint); |
119 QLineF line(sourcePoint, destPoint); |
128 if (qFuzzyCompare(line.length(), qreal(0.))) |
120 if (qFuzzyCompare(line.length(), qreal(0.))) |
129 return; |
121 return; |
|
122 //! [4] |
130 |
123 |
|
124 //! [5] |
131 // Draw the line itself |
125 // Draw the line itself |
132 painter->setPen(QPen(Qt::black, 1, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin)); |
126 painter->setPen(QPen(Qt::black, 1, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin)); |
133 painter->drawLine(line); |
127 painter->drawLine(line); |
|
128 //! [5] |
134 |
129 |
|
130 //! [6] |
135 // Draw the arrows |
131 // Draw the arrows |
136 double angle = ::acos(line.dx() / line.length()); |
132 double angle = ::acos(line.dx() / line.length()); |
137 if (line.dy() >= 0) |
133 if (line.dy() >= 0) |
138 angle = TwoPi - angle; |
134 angle = TwoPi - angle; |
139 |
135 |