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#include "plot.h"
#include "colorbar.h"
#include <qevent.h>
#include <qslider.h>
#include <qwhatsthis.h>
#include <qwt_plot_layout.h>
#include <qwt_plot_canvas.h>
#include <qwt_scale.h>
#include <stdlib.h>
Plot::Plot(QWidget *parent):
QwtPlot(parent)
{
setTitle("Interactive Plot");
setCanvasColor(Qt::darkCyan);
setGridMajPen(QPen(Qt::white, 0, Qt::DotLine));
// axes
setAxisScale(xBottom, 0.0, 100.0);
setAxisScale(yLeft, 0.0, 100.0);
plotLayout()->setAlignCanvasToScales(TRUE);
insertCurve(Qt::Vertical, Qt::blue, 30.0);
insertCurve(Qt::Vertical, Qt::magenta, 70.0);
insertCurve(Qt::Horizontal, Qt::yellow, 30.0);
insertCurve(Qt::Horizontal, Qt::white, 70.0);
replot();
// ------------------------------------
// We add a color bar to the left axis
// ------------------------------------
QwtScale *scale = (QwtScale *)axis(yLeft);
scale->setBaselineDist(10); // area for the color bar
QWhatsThis::add(scale,
"Selecting a value at the scale will insert a new curve.");
d_colorBar = new ColorBar(Qt::Vertical, scale);
d_colorBar->setRange(Qt::red, Qt::darkBlue);
d_colorBar->setFocusPolicy( TabFocus );
QWhatsThis::add(d_colorBar,
"Selecting a color will change the background of the plot.");
connect(d_colorBar, SIGNAL(selected(const QColor &)),
SLOT(setCanvasColor(const QColor &)));
// we need the resize events, to lay out the color bar
scale->installEventFilter(this);
// ------------------------------------
// We add a slider to the bottom axis
// ------------------------------------
scale = (QwtScale *)axis(xBottom);
scale->setBaselineDist(12); // area for the slider
QWhatsThis::add(scale,
"Selecting a value at the scale will insert a new curve.");
d_slider = new QSlider(0, 100, 10, 50, Qt::Horizontal, scale);
d_slider->setTracking(TRUE);
QWhatsThis::add(d_slider,
"With this slider you can move the visible area.");
connect(d_slider, SIGNAL(valueChanged(int)),
SLOT(sliderMoved(int)));
// we need the resize events, to lay out the slider
scale->installEventFilter(this);
}
void Plot::setCanvasColor(const QColor &c)
{
setCanvasBackground(c);
replot();
}
void Plot::sliderMoved(int)
{
// sync slider and axis
double pos = d_slider->sliderRect().center().x();
double range = d_slider->width();
double base = 50.0 - 100.0 * pos / range;
setAxisScale(xBottom, base, base + 100);
replot();
}
bool Plot::eventFilter(QObject *object, QEvent *e)
{
if ( e->type() == QEvent::Resize )
{
const QSize &size = ((QResizeEvent *)e)->size();
if ( object == (QObject *)axis(yLeft) )
{
const QwtScale *scale = axis(yLeft);
const int margin = 2;
// adjust the color bar to the scale backbone
const int x = size.width() - scale->baseLineDist() + margin;
const int w = scale->baseLineDist() - 2 * margin;
const int y = scale->startBorderDist();
const int h = size.height() -
scale->startBorderDist() - scale->endBorderDist();
d_colorBar->setGeometry(x, y, w, h);
}
if ( object == (QObject *)axis(xBottom) )
{
const QwtScale *scale = axis(xBottom);
// adjust the slider to the scale backbone
const int x = scale->startBorderDist();
const int w = size.width() -
scale->startBorderDist() - scale->endBorderDist();
const int y = 0;
const int h = scale->baseLineDist();
d_slider->setGeometry(x, y, w, h);
}
}
return QwtPlot::eventFilter(object, e);
}
void Plot::insertCurve(int axis, double base)
{
Qt::Orientation o;
if ( axis == yLeft || axis == yRight )
o = Qt::Horizontal;
else
o = Qt::Vertical;
QRgb rgb = (uint)rand();
insertCurve(o, QColor(rgb), base);
replot();
}
void Plot::insertCurve(Qt::Orientation o,
const QColor &c, double base)
{
QwtPlotCurve *curve = new QwtPlotCurve(this);
curve->setPen(c);
curve->setSymbol(QwtSymbol(QwtSymbol::Ellipse,
Qt::gray, c, QSize(8, 8)));
double x[10];
double y[sizeof(x) / sizeof(x[0])];
for ( uint i = 0; i < sizeof(x) / sizeof(x[0]); i++ )
{
double v = 5.0 + i * 10.0;
if ( o == Qt::Horizontal )
{
x[i] = v;
y[i] = base;
}
else
{
x[i] = base;
y[i] = v;
}
}
curve->setData(x, y, sizeof(x) / sizeof(x[0]));
(void)QwtPlot::insertCurve(curve);
}
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