void ScrollZoomer::rescale()
{
QwtScaleWidget *xScale = plot()->axisWidget( xAxis() );
QwtScaleWidget *yScale = plot()->axisWidget( yAxis() );
if ( zoomRectIndex() <= 0 )
{
if ( d_inZoom )
{
xScale->setMinBorderDist( 0, 0 );
yScale->setMinBorderDist( 0, 0 );
QwtPlotLayout *layout = plot()->plotLayout();
layout->setAlignCanvasToScales( d_alignCanvasToScales );
d_inZoom = false;
}
}
else
{
if ( !d_inZoom )
{
/*
We set a minimum border distance.
Otherwise the canvas size changes when scrolling,
between situations where the major ticks are at
the canvas borders (requiring extra space for the label)
and situations where all labels can be painted below/top
or left/right of the canvas.
*/
int start, end;
xScale->getBorderDistHint( start, end );
xScale->setMinBorderDist( start, end );
yScale->getBorderDistHint( start, end );
yScale->setMinBorderDist( start, end );
QwtPlotLayout *layout = plot()->plotLayout();
d_alignCanvasToScales = layout->alignCanvasToScales();
layout->setAlignCanvasToScales( false );
d_inZoom = true;
}
}
QwtPlotZoomer::rescale();
updateScrollBars();
}
Plot::Plot(int width, int height, QWidget *parent, const char *)
: QwtPlot(parent)
{
setAutoReplot (false);
marker_key = 0;
curve_key = 0;
minTickLength = 5;
majTickLength = 9;
setGeometry(QRect(0, 0, width, height));
setAxisTitle(QwtPlot::yLeft, tr("Y Axis Title"));
setAxisTitle(QwtPlot::xBottom, tr("X Axis Title"));
//due to the plot layout updates, we must always have a non empty title
setAxisTitle(QwtPlot::yRight, tr(" "));
setAxisTitle(QwtPlot::xTop, tr(" "));
// grid
d_grid = new Grid();
d_grid->attach(this);
//custom scale
for (int i= 0; i<QwtPlot::axisCnt; i++) {
QwtScaleWidget *scale = (QwtScaleWidget *) axisWidget(i);
if (scale) {
scale->setMargin(0);
//the axis title color must be initialized...
QwtText title = scale->title();
title.setColor(Qt::black);
scale->setTitle(title);
//...same for axis color
QPalette pal = scale->palette();
pal.setColor(QPalette::Foreground, QColor(Qt::black));
scale->setPalette(pal);
ScaleDraw *sd = new ScaleDraw(this);
sd->setTickLength(QwtScaleDiv::MinorTick, minTickLength);
sd->setTickLength(QwtScaleDiv::MediumTick, minTickLength);
sd->setTickLength(QwtScaleDiv::MajorTick, majTickLength);
setAxisScaleDraw (i, sd);
setAxisScaleEngine (i, new ScaleEngine());
}
}
QwtPlotLayout *pLayout = plotLayout();
pLayout->setCanvasMargin(0);
pLayout->setAlignCanvasToScales (true);
QwtPlotCanvas* plCanvas = canvas();
plCanvas->setFocusPolicy(Qt::StrongFocus);
plCanvas->setFocusIndicator(QwtPlotCanvas::ItemFocusIndicator);
//plCanvas->setFocus();
plCanvas->setFrameShadow(QwtPlot::Plain);
plCanvas->setCursor(Qt::arrowCursor);
plCanvas->setLineWidth(0);
plCanvas->setPaintAttribute(QwtPlotCanvas::PaintCached, false);
plCanvas->setPaintAttribute(QwtPlotCanvas::PaintPacked, false);
QColor background = QColor(Qt::white);
background.setAlpha(255);
QPalette palette;
palette.setColor(QPalette::Window, background);
setPalette(palette);
setCanvasBackground (background);
setFocusPolicy(Qt::StrongFocus);
//setFocusProxy(plCanvas);
setFrameShape(QFrame::Box);
setLineWidth(0);
}