QwtPlotScaleItem(3) Qwt User's Guide QwtPlotScaleItem(3) NAME QwtPlotScaleItem - A class which draws a scale inside the plot canvas. SYNOPSIS #include Inherits QwtPlotItem. Public Member Functions QwtPlotScaleItem (QwtScaleDraw::Alignment=QwtScaleDraw::BottomScale, const double pos=0.0) Constructor for scale item at the position pos. virtual ~QwtPlotScaleItem () Destructor. virtual int rtti () const override void setScaleDiv (const QwtScaleDiv &) Assign a scale division. 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 *) Set a scale draw. const QwtScaleDraw * scaleDraw () const QwtScaleDraw * scaleDraw () void setPosition (double pos) double position () const void setBorderDistance (int) Align the scale to the canvas. int borderDistance () const void setAlignment (QwtScaleDraw::Alignment) virtual void draw (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect) const override Draw the scale. virtual void updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &) override Update the item to changes of the axes scale division. Additional Inherited Members 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( QwtAxis::YLeft )->font() ); scaleItem->attach(plot); plot->setAxisVisible( QwtAxis::YLeft, false ); Definition at line 46 of file qwt_plot_scaleitem.h. 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 or QwtScaleDraw::TopScale 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() Definition at line 75 of file qwt_plot_scaleitem.cpp. Member Function Documentation int QwtPlotScaleItem::borderDistance () const Returns Distance from a canvas border See also setBorderDistance(), setPosition() Definition at line 312 of file qwt_plot_scaleitem.cpp. QFont QwtPlotScaleItem::font () const Returns tick label font See also setFont() Definition at line 196 of file qwt_plot_scaleitem.cpp. bool QwtPlotScaleItem::isScaleDivFromAxis () const Returns True, if the synchronization of the scale division with the corresponding axis is enabled. See also setScaleDiv(), setScaleDivFromAxis() Definition at line 150 of file qwt_plot_scaleitem.cpp. QPalette QwtPlotScaleItem::palette () const Returns palette See also setPalette() Definition at line 174 of file qwt_plot_scaleitem.cpp. double QwtPlotScaleItem::position () const Returns Position of the scale See also setPosition(), setAlignment() Definition at line 275 of file qwt_plot_scaleitem.cpp. int QwtPlotScaleItem::rtti () const [override], [virtual] Returns QwtPlotItem::Rtti_PlotScale Reimplemented from QwtPlotItem. Definition at line 94 of file qwt_plot_scaleitem.cpp. const QwtScaleDiv & QwtPlotScaleItem::scaleDiv () const Returns Scale division Definition at line 115 of file qwt_plot_scaleitem.cpp. QwtScaleDraw * QwtPlotScaleItem::scaleDraw () Returns Scale draw See also setScaleDraw() Definition at line 245 of file qwt_plot_scaleitem.cpp. const QwtScaleDraw * QwtPlotScaleItem::scaleDraw () const Returns Scale draw See also setScaleDraw() Definition at line 236 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: o QwtScaleDraw::BottomScale: horizontal, ticks below o QwtScaleDraw::TopScale: horizontal, ticks above o QwtScaleDraw::LeftScale: vertical, ticks left o QwtScaleDraw::RightScale: vertical, ticks right For horizontal scales the position corresponds to QwtPlotItem::yAxis(), otherwise to QwtPlotItem::xAxis(). See also scaleDraw(), QwtScaleDraw::alignment(), setPosition() Definition at line 333 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 rectangle 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() Definition at line 296 of file qwt_plot_scaleitem.cpp. void QwtPlotScaleItem::setFont (const QFont & font) Change the tick label font See also font() Definition at line 183 of file qwt_plot_scaleitem.cpp. void QwtPlotScaleItem::setPalette (const QPalette & palette) Set the palette See also QwtAbstractScaleDraw::draw(), palette() Definition at line 159 of file qwt_plot_scaleitem.cpp. 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() Definition at line 261 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. Parameters scaleDiv Scale division See also scaleDiv(), setScaleDivFromAxis(), isScaleDivFromAxis() Definition at line 108 of file qwt_plot_scaleitem.cpp. void QwtPlotScaleItem::setScaleDivFromAxis (bool on) Enable/Disable the synchronization of the scale division with the corresponding axis. Parameters on true/false See also isScaleDivFromAxis() Definition at line 127 of file qwt_plot_scaleitem.cpp. 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() Definition at line 212 of file qwt_plot_scaleitem.cpp. void QwtPlotScaleItem::updateScaleDiv (const QwtScaleDiv & xScaleDiv, const QwtScaleDiv & yScaleDiv) [override], [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. Definition at line 445 of file qwt_plot_scaleitem.cpp. Author Generated automatically by Doxygen for Qwt User's Guide from the source code. Version 6.2.0 Sun Jul 18 2021 QwtPlotScaleItem(3)