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Allow zooming and dragging only in one orientation

Browse Source 
By selecting the axis or the labels associated to the axis,the user can
restrict the subsequent zoom or drag operation to that orientation.

The possible user interactions are documented in the Whats's This
information.

See issue #1258
This commit is contained in:
mgrojo
2017-12-08 20:12:07 +01:00
parent 232130bc60
commit 5807c0be6b
3 changed files with 50 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
src/PlotDock.cpp
View File

@@ -24,6 +24,10 @@ PlotDock::PlotDock(QWidget* parent)
// Connect signals
connect(ui->treePlotColumns, &QTreeWidget::itemChanged, this, &PlotDock::on_treePlotColumns_itemChanged);
connect(ui->plotWidget, SIGNAL(selectionChangedByUser()), this, SLOT(selectionChanged()));
// connect slots that takes care that when an axis is selected, only that direction can be dragged and zoomed:
connect(ui->plotWidget, SIGNAL(mousePress(QMouseEvent*)), this, SLOT(mousePress()));
connect(ui->plotWidget, SIGNAL(mouseWheel(QWheelEvent*)), this, SLOT(mouseWheel()));
}
PlotDock::~PlotDock()
@@ -203,7 +207,8 @@ void PlotDock::updatePlot(SqliteTableModel* model, BrowseDataTableSettings* sett
graph->setSelectable (QCP::stDataRange);
// Enable: click on items to select them, Ctrl+Click for multi-selection, mouse-wheel for zooming and mouse drag for
// changing the visible range.
ui->plotWidget->setInteractions(QCP::iSelectPlottables | QCP::iMultiSelect | QCP::iRangeZoom | QCP::iRangeDrag);
// Select one axis for zoom and drag applying only to that orientation.
ui->plotWidget->setInteractions(QCP::iSelectPlottables | QCP::iMultiSelect | QCP::iRangeZoom | QCP::iRangeDrag | QCP::iSelectAxes);
ui->plotWidget->setSelectionRectMode(QCP::srmNone);
// prepare the data vectors for qcustomplot
@@ -572,3 +577,36 @@ void PlotDock::selectionChanged()
}
}
void PlotDock::mousePress()
{
// if an axis (or axis labels) is selected, only allow the direction of that axis to be dragged
// if no axis (or axis labels) is selected, both directions may be dragged
if (ui->plotWidget->xAxis->selectedParts().testFlag(QCPAxis::spAxis) ||
ui->plotWidget->xAxis->selectedParts().testFlag(QCPAxis::spTickLabels) ||
ui->plotWidget->xAxis->selectedParts().testFlag(QCPAxis::spAxisLabel))
ui->plotWidget->axisRect()->setRangeDrag(ui->plotWidget->xAxis->orientation());
else if (ui->plotWidget->yAxis->selectedParts().testFlag(QCPAxis::spAxis) ||
ui->plotWidget->yAxis->selectedParts().testFlag(QCPAxis::spTickLabels) ||
ui->plotWidget->yAxis->selectedParts().testFlag(QCPAxis::spAxisLabel))
ui->plotWidget->axisRect()->setRangeDrag(ui->plotWidget->yAxis->orientation());
else
ui->plotWidget->axisRect()->setRangeDrag(Qt::Horizontal | Qt::Vertical);
}
void PlotDock::mouseWheel()
{
// if an axis (or axis labels) is selected, only allow the direction of that axis to be zoomed
// if no axis (or axis labels) is selected, both directions may be zoomed
if (ui->plotWidget->xAxis->selectedParts().testFlag(QCPAxis::spAxis) ||
ui->plotWidget->xAxis->selectedParts().testFlag(QCPAxis::spTickLabels) ||
ui->plotWidget->xAxis->selectedParts().testFlag(QCPAxis::spAxisLabel))
ui->plotWidget->axisRect()->setRangeZoom(ui->plotWidget->xAxis->orientation());
else if (ui->plotWidget->yAxis->selectedParts().testFlag(QCPAxis::spAxis) ||
ui->plotWidget->yAxis->selectedParts().testFlag(QCPAxis::spTickLabels) ||
ui->plotWidget->yAxis->selectedParts().testFlag(QCPAxis::spAxisLabel))
ui->plotWidget->axisRect()->setRangeZoom(ui->plotWidget->yAxis->orientation());
else
ui->plotWidget->axisRect()->setRangeZoom(Qt::Horizontal | Qt::Vertical);
}

2
src/PlotDock.h
View File

@@ -97,6 +97,8 @@ private slots:
void on_comboLineType_currentIndexChanged(int index);
void on_comboPointShape_currentIndexChanged(int index);
void selectionChanged();
void mousePress();
void mouseWheel();
};
#endif

9
src/PlotDock.ui
View File

@@ -61,6 +61,15 @@
<verstretch>8</verstretch>
</sizepolicy>
</property>
<property name="whatsThis">
<string>Here is a plot drawn when you select the x and y values above.
Click on points to select them in the plot and in the table. Ctrl+Click for selecting a range of points.
Use mouse-wheel for zooming and mouse drag for changing the axis range.
Select the axes or axes labels to drag and zoom only in that orientation.</string>
</property>
</widget>
</widget>
</item>