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39 ** |
38 ** |
40 ****************************************************************************/ |
39 ****************************************************************************/ |
41 |
40 |
42 #include "graphwidget.h" |
41 #include "graphwidget.h" |
43 #include "edge.h" |
42 #include "edge.h" |
44 #include "node.h" |
43 #include "node.h" |
45 |
44 |
46 #include <QDebug> |
45 #include <QtGui> |
47 #include <QGraphicsScene> |
|
48 #include <QWheelEvent> |
|
49 |
46 |
50 #include <math.h> |
47 #include <math.h> |
51 |
48 |
52 GraphWidget::GraphWidget() |
49 //! [0] |
53 : timerId(0) |
50 GraphWidget::GraphWidget(QWidget *parent) |
|
51 : QGraphicsView(parent), timerId(0) |
54 { |
52 { |
55 QGraphicsScene *scene = new QGraphicsScene(this); |
53 QGraphicsScene *scene = new QGraphicsScene(this); |
56 scene->setItemIndexMethod(QGraphicsScene::NoIndex); |
54 scene->setItemIndexMethod(QGraphicsScene::NoIndex); |
57 scene->setSceneRect(-200, -200, 400, 400); |
55 scene->setSceneRect(-200, -200, 400, 400); |
58 setScene(scene); |
56 setScene(scene); |
59 setCacheMode(CacheBackground); |
57 setCacheMode(CacheBackground); |
60 setViewportUpdateMode(BoundingRectViewportUpdate); |
58 setViewportUpdateMode(BoundingRectViewportUpdate); |
61 setRenderHint(QPainter::Antialiasing); |
59 setRenderHint(QPainter::Antialiasing); |
62 setTransformationAnchor(AnchorUnderMouse); |
60 setTransformationAnchor(AnchorUnderMouse); |
63 setResizeAnchor(AnchorViewCenter); |
61 scale(qreal(0.8), qreal(0.8)); |
64 |
62 setMinimumSize(400, 400); |
|
63 setWindowTitle(tr("Elastic Nodes")); |
|
64 //! [0] |
|
65 |
|
66 //! [1] |
65 Node *node1 = new Node(this); |
67 Node *node1 = new Node(this); |
66 Node *node2 = new Node(this); |
68 Node *node2 = new Node(this); |
67 Node *node3 = new Node(this); |
69 Node *node3 = new Node(this); |
68 Node *node4 = new Node(this); |
70 Node *node4 = new Node(this); |
69 centerNode = new Node(this); |
71 centerNode = new Node(this); |
100 centerNode->setPos(0, 0); |
102 centerNode->setPos(0, 0); |
101 node6->setPos(50, 0); |
103 node6->setPos(50, 0); |
102 node7->setPos(-50, 50); |
104 node7->setPos(-50, 50); |
103 node8->setPos(0, 50); |
105 node8->setPos(0, 50); |
104 node9->setPos(50, 50); |
106 node9->setPos(50, 50); |
105 |
107 } |
106 scale(qreal(0.8), qreal(0.8)); |
108 //! [1] |
107 setMinimumSize(400, 400); |
109 |
108 setWindowTitle(tr("Elastic Nodes")); |
110 //! [2] |
109 } |
|
110 |
|
111 void GraphWidget::itemMoved() |
111 void GraphWidget::itemMoved() |
112 { |
112 { |
113 if (!timerId) |
113 if (!timerId) |
114 timerId = startTimer(1000 / 25); |
114 timerId = startTimer(1000 / 25); |
115 } |
115 } |
116 |
116 //! [2] |
|
117 |
|
118 //! [3] |
117 void GraphWidget::keyPressEvent(QKeyEvent *event) |
119 void GraphWidget::keyPressEvent(QKeyEvent *event) |
118 { |
120 { |
119 switch (event->key()) { |
121 switch (event->key()) { |
120 case Qt::Key_Up: |
122 case Qt::Key_Up: |
121 centerNode->moveBy(0, -20); |
123 centerNode->moveBy(0, -20); |
211 painter->setPen(Qt::lightGray); |
219 painter->setPen(Qt::lightGray); |
212 painter->drawText(textRect.translated(2, 2), message); |
220 painter->drawText(textRect.translated(2, 2), message); |
213 painter->setPen(Qt::black); |
221 painter->setPen(Qt::black); |
214 painter->drawText(textRect, message); |
222 painter->drawText(textRect, message); |
215 } |
223 } |
216 |
224 //! [6] |
|
225 |
|
226 //! [7] |
217 void GraphWidget::scaleView(qreal scaleFactor) |
227 void GraphWidget::scaleView(qreal scaleFactor) |
218 { |
228 { |
219 qreal factor = matrix().scale(scaleFactor, scaleFactor).mapRect(QRectF(0, 0, 1, 1)).width(); |
229 qreal factor = transform().scale(scaleFactor, scaleFactor).mapRect(QRectF(0, 0, 1, 1)).width(); |
220 if (factor < 0.07 || factor > 100) |
230 if (factor < 0.07 || factor > 100) |
221 return; |
231 return; |
222 |
232 |
223 scale(scaleFactor, scaleFactor); |
233 scale(scaleFactor, scaleFactor); |
224 } |
234 } |
|
235 //! [7] |