Qwt User's Guide: qwt_polar_panner.cpp Source File

Qwt User's Guide 6.3.0

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qwt_polar_panner.cpp
1/******************************************************************************
2 * QwtPolar Widget Library
3 * Copyright (C) 2008 Uwe Rathmann
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the Qwt License, Version 1.0
7 *****************************************************************************/
8
9#include "qwt_polar_panner.h"
10#include "qwt_polar_plot.h"
11#include "qwt_polar_canvas.h"
12#include "qwt_scale_div.h"
13#include "qwt_point_polar.h"
14
16QwtPolarPanner::QwtPolarPanner( QwtPolarCanvas* canvas )
17 : QwtPanner( canvas )
18{
19 connect( this, SIGNAL(panned(int,int)),
20 SLOT(movePlot(int,int)) );
21}
22
24QwtPolarPanner::~QwtPolarPanner()
25{
26}
27
29 QwtPolarCanvas* QwtPolarPanner::canvas()
30{
31 return qobject_cast< QwtPolarCanvas* >( parent() );
32}
33
35 const QwtPolarCanvas* QwtPolarPanner::canvas() const
36{
37 return qobject_cast< const QwtPolarCanvas* >( parent() );
38}
39
41 QwtPolarPlot* QwtPolarPanner::plot()
42{
43 QwtPolarCanvas* c = canvas();
44 if ( c )
45 return c->plot();
46
47 return NULL;
48}
49
51 const QwtPolarPlot* QwtPolarPanner::plot() const
52{
53 const QwtPolarCanvas* c = canvas();
54 if ( c )
55 return c->plot();
56
57 return NULL;
58}
59
68 void QwtPolarPanner::movePlot( int dx, int dy )
69{
70 QwtPolarPlot* plot = QwtPolarPanner::plot();
71 if ( plot == NULL || ( dx == 0 && dy == 0 ) )
72 return;
73
74 const QwtScaleMap map = plot->scaleMap( QwtPolar::Radius );
75
76 QwtPointPolar pos = plot->zoomPos();
77 if ( map.s1() <= map.s2() )
78 {
79 pos.setRadius(
80 map.transform( map.s1() + pos.radius() ) - map.p1() );
81 pos.setPoint( pos.toPoint() - QPointF( dx, -dy ) );
82 pos.setRadius(
83 map.invTransform( map.p1() + pos.radius() ) - map.s1() );
84 }
85 else
86 {
87 pos.setRadius(
88 map.transform( map.s1() - pos.radius() ) - map.p1() );
89 pos.setPoint( pos.toPoint() - QPointF( dx, -dy ) );
90 pos.setRadius(
91 map.s1() - map.invTransform( map.p1() + pos.radius() ) );
92 }
93
94 const bool doAutoReplot = plot->autoReplot();
95 plot->setAutoReplot( false );
96
97 plot->zoom( pos, plot->zoomFactor() );
98
99 plot->setAutoReplot( doAutoReplot );
100 plot->replot();
101}
102
108 void QwtPolarPanner::widgetMousePressEvent( QMouseEvent* event )
109{
110 const QwtPolarPlot* plot = QwtPolarPanner::plot();
111 if ( plot )
112 {
113 if ( plot->zoomFactor() < 1.0 )
114 QwtPanner::widgetMousePressEvent( event );
115 }
116}
117
118#include "moc_qwt_polar_panner.cpp"
QwtPanner
QwtPanner provides panning of a widget.
Definition qwt_panner.h:36
QwtPanner::widgetMousePressEvent
virtual void widgetMousePressEvent(QMouseEvent *)
Definition qwt_panner.cpp:381
QwtPanner::panned
void panned(int dx, int dy)
QwtPointPolar
A point in polar coordinates.
Definition qwt_point_polar.h:29
QwtPointPolar::radius
double radius() const
Returns the radius.
Definition qwt_point_polar.h:102
QwtPointPolar::setRadius
void setRadius(double)
Sets the radius to radius.
Definition qwt_point_polar.h:126
QwtPointPolar::toPoint
QPointF toPoint() const
Definition qwt_point_polar.cpp:68
QwtPointPolar::setPoint
void setPoint(const QPointF &)
Definition qwt_point_polar.cpp:54
QwtPolarCanvas
Canvas of a QwtPolarPlot.
Definition qwt_polar_canvas.h:28
QwtPolarCanvas::plot
QwtPolarPlot * plot()
Definition qwt_polar_canvas.cpp:97
QwtPolarPanner::canvas
QwtPolarCanvas * canvas()
Definition qwt_polar_panner.cpp:29
QwtPolarPanner::~QwtPolarPanner
virtual ~QwtPolarPanner()
Destructor.
Definition qwt_polar_panner.cpp:24
QwtPolarPanner::widgetMousePressEvent
virtual void widgetMousePressEvent(QMouseEvent *) override
Definition qwt_polar_panner.cpp:108
QwtPolarPanner::QwtPolarPanner
QwtPolarPanner(QwtPolarCanvas *)
Create a plot panner for a polar plot canvas.
Definition qwt_polar_panner.cpp:16
QwtPolarPanner::movePlot
virtual void movePlot(int dx, int dy)
Definition qwt_polar_panner.cpp:68
QwtPolarPanner::plot
QwtPolarPlot * plot()
Definition qwt_polar_panner.cpp:41
QwtPolarPlot
A plotting widget, displaying a polar coordinate system.
Definition qwt_polar_plot.h:47
QwtPolarPlot::scaleMap
QwtScaleMap scaleMap(int scaleId, double radius) const
Definition qwt_polar_plot.cpp:730
QwtPolarPlot::zoomPos
QwtPointPolar zoomPos() const
Definition qwt_polar_plot.cpp:682
QwtPolarPlot::replot
virtual void replot()
Redraw the plot.
Definition qwt_polar_plot.cpp:899
QwtPolarPlot::zoom
void zoom(const QwtPointPolar &, double factor)
Translate and in/decrease the zoom factor.
Definition qwt_polar_plot.cpp:651
QwtPolarPlot::zoomFactor
double zoomFactor() const
Definition qwt_polar_plot.cpp:691
QwtPolarPlot::autoReplot
bool autoReplot() const
Definition qwt_polar_plot.cpp:348
QwtPolarPlot::setAutoReplot
void setAutoReplot(bool tf=true)
Set or reset the autoReplot option.
Definition qwt_polar_plot.cpp:342
QwtScaleMap
A scale map.
Definition qwt_scale_map.h:27
QwtScaleMap::p1
double p1() const
Definition qwt_scale_map.h:99
QwtScaleMap::transform
double transform(double s) const
Definition qwt_scale_map.h:137
QwtScaleMap::s1
double s1() const
Definition qwt_scale_map.h:83
QwtScaleMap::s2
double s2() const
Definition qwt_scale_map.h:91
QwtScaleMap::invTransform
double invTransform(double p) const
Definition qwt_scale_map.h:154