QwtPlotScaleItem Class Reference
A class which draws a scale inside the plot canvas. More...
#include <qwt_plot_scaleitem.h>
Public Member Functions | |
| QwtPlotScaleItem (QwtScaleDraw::Alignment=QwtScaleDraw::BottomScale, const double pos=0.0) | |
| virtual | ~QwtPlotScaleItem () |
| virtual int | rtti () const |
| void | setScaleDiv (const QwtScaleDiv &) |
| const QwtScaleDiv & | scaleDiv () const |
| void | setScaleDivFromAxis (bool on) |
| bool | isScaleDivFromAxis () const |
| void | setPalette (const QPalette &) |
| QPalette | palette () const |
| void | setFont (const QFont &) |
| QFont | font () const |
| void | setScaleDraw (QwtScaleDraw *) |
| const QwtScaleDraw * | scaleDraw () const |
| QwtScaleDraw * | scaleDraw () |
| void | setPosition (double pos) |
| double | position () const |
| void | setBorderDistance (int numPixels) |
| int | borderDistance () const |
| void | setAlignment (QwtScaleDraw::Alignment) |
| virtual void | draw (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRect &rect) const |
| virtual void | updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &) |
Detailed Description
A class which draws a scale inside the plot canvas.
QwtPlotScaleItem can be used to draw an axis inside the plot canvas. It might by synchronized to one of the axis of the plot, but can also display its own ticks and labels.
It is allowed to synchronize the scale item with a disabled axis. In plots with vertical and horizontal scale items, it might be necessary to remove ticks at the intersections, by overloading updateScaleDiv().
The scale might be at a specific position (f.e 0.0) or it might be aligned to a canvas border.
- Example
- The following example shows how to replace the left axis, by a scale item at the x position 0.0.
QwtPlotScaleItem *scaleItem = new QwtPlotScaleItem(QwtScaleDraw::RightScale, 0.0); scaleItem->setFont(plot->axisWidget(QwtPlot::yLeft)->font()); scaleItem->attach(plot); plot->enableAxis(QwtPlot::yLeft, false);
Constructor & Destructor Documentation
| QwtPlotScaleItem::QwtPlotScaleItem | ( | QwtScaleDraw::Alignment | alignment = QwtScaleDraw::BottomScale, |
|
| const double | pos = 0.0 | |||
| ) | [explicit] |
Constructor for scale item at the position pos.
- Parameters:
-
alignment In case of QwtScaleDraw::BottomScale/QwtScaleDrawTopScale the scale item is corresponding to the xAxis(), otherwise it corresponds to the yAxis(). pos x or y position, depending on the corresponding axis.
- See also:
- setPosition(), setAlignment()
| QwtPlotScaleItem::~QwtPlotScaleItem | ( | ) | [virtual] |
Destructor.
Member Function Documentation
| int QwtPlotScaleItem::borderDistance | ( | ) | const |
- Returns:
- Distance from a canvas border
- See also:
- setBorderDistance(), setPosition()
| void QwtPlotScaleItem::draw | ( | QPainter * | p, | |
| const QwtScaleMap & | xMap, | |||
| const QwtScaleMap & | yMap, | |||
| const QRect & | rect | |||
| ) | const [virtual] |
Draw the scale.
Implements QwtPlotItem.
| QFont QwtPlotScaleItem::font | ( | ) | const |
- Returns:
- tick label font
- See also:
- setFont()
| bool QwtPlotScaleItem::isScaleDivFromAxis | ( | ) | const |
- Returns:
- True, if the synchronization of the scale division with the corresponding axis is enabled.
- See also:
- setScaleDiv(), setScaleDivFromAxis()
| QPalette QwtPlotScaleItem::palette | ( | ) | const |
- Returns:
- palette
- See also:
- setPalette()
| double QwtPlotScaleItem::position | ( | ) | const |
- Returns:
- Position of the scale
- See also:
- setPosition(), setAlignment()
| int QwtPlotScaleItem::rtti | ( | ) | const [virtual] |
- Returns:
- QwtPlotItem::Rtti_PlotScale
Reimplemented from QwtPlotItem.
| const QwtScaleDiv & QwtPlotScaleItem::scaleDiv | ( | ) | const |
- Returns:
- Scale division
| QwtScaleDraw * QwtPlotScaleItem::scaleDraw | ( | ) |
- Returns:
- Scale draw
- See also:
- setScaleDraw()
| const QwtScaleDraw * QwtPlotScaleItem::scaleDraw | ( | ) | const |
- Returns:
- Scale draw
- See also:
- setScaleDraw()
| void QwtPlotScaleItem::setAlignment | ( | QwtScaleDraw::Alignment | alignment | ) |
Change the alignment of the scale
The alignment sets the orientation of the scale and the position of the ticks:
- QwtScaleDraw::BottomScale: horizontal, ticks below
- QwtScaleDraw::TopScale: horizontal, ticks above
- QwtScaleDraw::LeftScale: vertical, ticks left
- QwtScaleDraw::RightScale: vertical, ticks right
For horizontal scales the position corresponds to QwtPlotItem::yAxis(), otherwise to QwtPlotItem::xAxis().
- See also:
- scaleDraw(), QwtScaleDraw::alignment(), setPosition()
| void QwtPlotScaleItem::setBorderDistance | ( | int | distance | ) |
Align the scale to the canvas.
If distance is >= 0 the scale will be aligned to a border of the contents rect of the canvas. If alignment() is QwtScaleDraw::LeftScale, the scale will be aligned to the right border, if it is QwtScaleDraw::TopScale it will be aligned to the bottom (and vice versa),
If distance is < 0 the scale will be at the position().
- Parameters:
-
distance Number of pixels between the canvas border and the backbone of the scale.
- See also:
- setPosition(), borderDistance()
| void QwtPlotScaleItem::setFont | ( | const QFont & | font | ) |
Change the tick label font
- See also:
- font()
| void QwtPlotScaleItem::setPalette | ( | const QPalette & | palette | ) |
Set the palette
- See also:
- QwtAbstractScaleDraw::draw(), palette()
| void QwtPlotScaleItem::setPosition | ( | double | pos | ) |
Change the position of the scale
The position is interpreted as y value for horizontal axes and as x value for vertical axes.
The border distance is set to -1.
- Parameters:
-
pos New position
- See also:
- position(), setAlignment()
| void QwtPlotScaleItem::setScaleDiv | ( | const QwtScaleDiv & | scaleDiv | ) |
Assign a scale division.
When assigning a scaleDiv the scale division won't be synchronized with the corresponding axis anymore.
- Parameters:
-
scaleDiv Scale division
- See also:
- scaleDiv(), setScaleDivFromAxis(), isScaleDivFromAxis()
| void QwtPlotScaleItem::setScaleDivFromAxis | ( | bool | on | ) |
Enable/Disable the synchronization of the scale division with the corresponding axis.
- Parameters:
-
on true/false
- See also:
- isScaleDivFromAxis()
| void QwtPlotScaleItem::setScaleDraw | ( | QwtScaleDraw * | scaleDraw | ) |
Set a scale draw.
- Parameters:
-
scaleDraw object responsible for drawing scales.
The main use case for replacing the default QwtScaleDraw is to overload QwtAbstractScaleDraw::label, to replace or swallow tick labels.
- See also:
- scaleDraw()
| void QwtPlotScaleItem::updateScaleDiv | ( | const QwtScaleDiv & | xScaleDiv, | |
| const QwtScaleDiv & | yScaleDiv | |||
| ) | [virtual] |
Update the item to changes of the axes scale division.
In case of isScaleDivFromAxis(), the scale draw is synchronized to the correspond axis.
- Parameters:
-
xScaleDiv Scale division of the x-axis yScaleDiv Scale division of the y-axis
- See also:
- QwtPlot::updateAxes()
Reimplemented from QwtPlotItem.
Generated on Wed Sep 2 18:37:26 2009 for Qwt User's Guide by
1.6.1