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.
QwtPlotScaleItem *scaleItem = new QwtPlotScaleItem(QwtScaleDraw::RightScale, 0.0); scaleItem->setFont(plot->axisWidget(QwtPlot::yLeft)->font()); scaleItem->attach(plot); plot->enableAxis(QwtPlot::yLeft, false);
Definition at line 51 of file 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 &) |
QwtPlotScaleItem::QwtPlotScaleItem | ( | QwtScaleDraw::Alignment | alignment = QwtScaleDraw::BottomScale , |
|
const double | pos = 0.0 | |||
) | [explicit] |
Constructor for scale item at the position pos.
alignment | In case of QwtScaleDraw::BottomScale/QwtScaleDrawTopScale the scale item is corresponding to the xAxis(), otherwise it corresponds to the yAxis(). | |
position | x or y position, depending on the corresponding axis. |
Definition at line 58 of file qwt_plot_scaleitem.cpp.
References QwtPlotItem::setZ().
QwtPlotScaleItem::~QwtPlotScaleItem | ( | ) | [virtual] |
int QwtPlotScaleItem::rtti | ( | ) | const [virtual] |
Reimplemented from QwtPlotItem.
Definition at line 76 of file qwt_plot_scaleitem.cpp.
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.
scaleDiv | Scale division |
Definition at line 90 of file qwt_plot_scaleitem.cpp.
const QwtScaleDiv & QwtPlotScaleItem::scaleDiv | ( | ) | const |
void QwtPlotScaleItem::setScaleDivFromAxis | ( | bool | on | ) |
Enable/Disable the synchronization of the scale division with the corresponding axis.
Definition at line 108 of file qwt_plot_scaleitem.cpp.
References QwtPlot::axisScaleDiv(), QwtPlotItem::itemChanged(), QwtPlotItem::plot(), updateScaleDiv(), QwtPlotItem::xAxis(), and QwtPlotItem::yAxis().
bool QwtPlotScaleItem::isScaleDivFromAxis | ( | ) | const |
Definition at line 131 of file qwt_plot_scaleitem.cpp.
void QwtPlotScaleItem::setPalette | ( | const QPalette & | palette | ) |
Set the palette
Definition at line 166 of file qwt_plot_scaleitem.cpp.
References QwtPlotItem::itemChanged().
QPalette QwtPlotScaleItem::palette | ( | ) | const |
void QwtPlotScaleItem::setFont | ( | const QFont & | font | ) |
Change the tick label font
Definition at line 190 of file qwt_plot_scaleitem.cpp.
References QwtPlotItem::itemChanged().
QFont QwtPlotScaleItem::font | ( | ) | const |
void QwtPlotScaleItem::setScaleDraw | ( | QwtScaleDraw * | scaleDraw | ) |
Set a scale draw.
axisId | axis index | |
scaleDraw | object responsible for drawing scales. |
Definition at line 220 of file qwt_plot_scaleitem.cpp.
References QwtPlot::axisScaleDiv(), QwtPlotItem::itemChanged(), QwtPlotItem::plot(), updateScaleDiv(), QwtPlotItem::xAxis(), and QwtPlotItem::yAxis().
const QwtScaleDraw * QwtPlotScaleItem::scaleDraw | ( | ) | const |
QwtScaleDraw * QwtPlotScaleItem::scaleDraw | ( | ) |
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.
Definition at line 268 of file qwt_plot_scaleitem.cpp.
References QwtPlotItem::itemChanged().
double QwtPlotScaleItem::position | ( | ) | const |
Definition at line 282 of file qwt_plot_scaleitem.cpp.
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().
distance | Number of pixels between the canvas border and the backbone of the scale. |
Definition at line 303 of file qwt_plot_scaleitem.cpp.
References QwtPlotItem::itemChanged().
int QwtPlotScaleItem::borderDistance | ( | ) | const |
Definition at line 319 of file qwt_plot_scaleitem.cpp.
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:
For horizontal scales the position corresponds to QwtPlotItem::yAxis(), otherwise to QwtPlotItem::xAxis().
Definition at line 340 of file qwt_plot_scaleitem.cpp.
References QwtScaleDraw::alignment(), QwtPlotItem::itemChanged(), and QwtScaleDraw::setAlignment().
void QwtPlotScaleItem::draw | ( | QPainter * | p, | |
const QwtScaleMap & | xMap, | |||
const QwtScaleMap & | yMap, | |||
const QRect & | rect | |||
) | const [virtual] |
Draw the scale.
Implements QwtPlotItem.
Definition at line 353 of file qwt_plot_scaleitem.cpp.
References QwtScaleDraw::alignment(), QwtScaleTransformation::copy(), QwtAbstractScaleDraw::draw(), QwtScaleDraw::move(), QwtScaleDraw::orientation(), QwtScaleDraw::setLength(), QwtAbstractScaleDraw::setTransformation(), QwtScaleMap::transform(), QwtScaleMap::transformation(), and updateBorders().
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.
xScaleDiv | Scale division of the x-axis | |
yScaleDiv | Scale division of the y-axis |
Reimplemented from QwtPlotItem.
Definition at line 443 of file qwt_plot_scaleitem.cpp.
References QwtScaleDraw::orientation(), and QwtAbstractScaleDraw::setScaleDiv().
Referenced by setScaleDivFromAxis(), and setScaleDraw().