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Tuning zoom example (key zooming was removed from QChartView)
Tero Ahola -
r966:69613711a0c3
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@@ -4,4 +4,19
4 \subtitle
4 \subtitle
5
5
6 The example shows how to create your own custom zooming effect with QRubberBand.
6 The example shows how to create your own custom zooming effect with QRubberBand.
7 \image example_zoomlinechart1.png
8 \image example_zoomlinechart2.png
9
10 Let's first create a line series with some example data.
11 \snippet ../examples/zoomlinechart/main.cpp 1
12
13 Then we create a custom chart view by deriving from QChartView:
14 \snippet ../examples/zoomlinechart/chartview.h 1
15
16 We override mouse and key event handling
17 \snippet ../examples/zoomlinechart/chartview.h 2
18
19 Then we implement a custom logic for mouse and key events. For example pressing '+' key will zoom in and pressing
20 the '-' key will zoom out.
21 \snippet ../examples/zoomlinechart/chartview.cpp 1
7 */
22 */
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@@ -59,6 +59,7 void ChartView::mouseReleaseEvent(QMouseEvent *event)
59 }
59 }
60 }
60 }
61
61
62 //![1]
62 void ChartView::keyPressEvent(QKeyEvent *event)
63 void ChartView::keyPressEvent(QKeyEvent *event)
63 {
64 {
64 switch (event->key()) {
65 switch (event->key()) {
@@ -68,6 +69,7 void ChartView::keyPressEvent(QKeyEvent *event)
68 case Qt::Key_Minus:
69 case Qt::Key_Minus:
69 m_chart->zoomOut();
70 m_chart->zoomOut();
70 break;
71 break;
72 //![1]
71 case Qt::Key_Left:
73 case Qt::Key_Left:
72 m_chart->scrollLeft();
74 m_chart->scrollLeft();
73 break;
75 break;
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@@ -25,23 +25,25
25
25
26 QTCOMMERCIALCHART_USE_NAMESPACE
26 QTCOMMERCIALCHART_USE_NAMESPACE
27
27
28 //![1]
28 class ChartView : public QChartView
29 class ChartView : public QChartView
30 //![1]
29 {
31 {
30 public:
32 public:
31 ChartView(QChart *chart, QWidget *parent = 0);
33 ChartView(QChart *chart, QWidget *parent = 0);
32
34
35 //![2]
33 protected:
36 protected:
34 void mousePressEvent(QMouseEvent *event);
37 void mousePressEvent(QMouseEvent *event);
35 void mouseMoveEvent(QMouseEvent *event);
38 void mouseMoveEvent(QMouseEvent *event);
36 void mouseReleaseEvent(QMouseEvent *event);
39 void mouseReleaseEvent(QMouseEvent *event);
37 void keyPressEvent(QKeyEvent *event);
40 void keyPressEvent(QKeyEvent *event);
41 //![2]
38
42
39 private:
43 private:
40 bool rubberBandIsShown;
41 QRubberBand m_rubberBand;
44 QRubberBand m_rubberBand;
42 QPoint m_origin;
45 QPoint m_origin;
43 QChart* m_chart;
46 QChart* m_chart;
44
45 };
47 };
46
48
47 #endif
49 #endif
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@@ -30,42 +30,27 int main(int argc, char *argv[])
30 QApplication a(argc, argv);
30 QApplication a(argc, argv);
31
31
32 //![1]
32 //![1]
33 QLineSeries* series0 = new QLineSeries();
33 QLineSeries* series = new QLineSeries();
34 QPen blue(Qt::blue);
34 qreal yValue = 0.0;
35 blue.setWidth(3);
35 for (int i(0); i < 500; i++) {
36 series0->setPen(blue);
36 yValue = yValue + (qreal) (qrand() % 10) / 500.0;
37
37 QPointF value((i + (qreal) rand() / (qreal) RAND_MAX) * (10.0 / 500.0), yValue);
38 QLineSeries* series1 = new QLineSeries();
38 *series << value;
39 QPen red(Qt::red);
39 }
40 red.setWidth(3);
41 series1->setPen(red);
42 //![1]
40 //![1]
43
41
44 //![2]
45 *series0 << QPointF(0, 6) << QPointF(2, 4) << QPointF(3, 8) << QPointF(7, 4) << QPointF(10, 5);
46 *series1 << QPointF(1, 1) << QPointF(3, 3) << QPointF(7, 6) << QPointF(8, 3) << QPointF(10, 2);
47 //![2]
48
49 //![3]
50 QChart* chart = new QChart();
42 QChart* chart = new QChart();
51
43 chart->addSeries(series);
52 chart->addSeries(series0);
44 chart->setTitle("Zoom in/out example");
53 chart->addSeries(series1);
54 chart->setTitle("Zoom in/out chart example");
55 chart->setAnimationOptions(QChart::AllAnimations);
45 chart->setAnimationOptions(QChart::AllAnimations);
56 //![3]
57
46
58 //![4]
47 ChartView* chartView = new ChartView(chart);
59 ChartView* chartView = new ChartView(chart);
48 chartView->setRenderHint(QPainter::Antialiasing);
60 chartView->setRenderHint(QPainter::Antialiasing);
61 //![4]
62
49
63 //![5]
50 QMainWindow window;
64 QMainWindow window;
51 window.setCentralWidget(chartView);
65 window.setCentralWidget(chartView);
52 window.resize(400, 300);
66 window.resize(400, 300);
53 window.show();
67 window.show();
68 //![5]
69
54
70 return a.exec();
55 return a.exec();
71 }
56 }
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