83 lines
3.4 KiB
C++
83 lines
3.4 KiB
C++
#include "frmscrollbar.h"
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#include "ui_frmscrollbar.h"
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#include "qdebug.h"
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frmScrollBar::frmScrollBar(QWidget *parent) : QWidget(parent), ui(new Ui::frmScrollBar)
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{
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ui->setupUi(this);
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this->initForm();
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}
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frmScrollBar::~frmScrollBar()
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{
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delete ui;
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}
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void frmScrollBar::initForm()
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{
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// The following plot setup is mostly taken from the plot demos:
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ui->customPlot->addGraph();
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ui->customPlot->graph()->setPen(QPen(Qt::blue));
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ui->customPlot->graph()->setBrush(QBrush(QColor(0, 0, 255, 20)));
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ui->customPlot->addGraph();
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ui->customPlot->graph()->setPen(QPen(Qt::red));
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QVector<double> x(500), y0(500), y1(500);
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for (int i = 0; i < 500; ++i) {
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x[i] = (i / 499.0 - 0.5) * 10;
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y0[i] = qExp(-x[i] * x[i] * 0.25) * qSin(x[i] * 5) * 5;
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y1[i] = qExp(-x[i] * x[i] * 0.25) * 5;
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}
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ui->customPlot->graph(0)->setData(x, y0);
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ui->customPlot->graph(1)->setData(x, y1);
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ui->customPlot->axisRect()->setupFullAxesBox(true);
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ui->customPlot->setInteractions(QCP::iRangeDrag | QCP::iRangeZoom);
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// configure scroll bars:
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// Since scroll bars only support integer values, we'll set a high default range of -500..500 and
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// divide scroll bar position values by 100 to provide a scroll range -5..5 in floating point
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// axis coordinates. if you want to dynamically grow the range accessible with the scroll bar,
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// just increase the minimum/maximum values of the scroll bars as needed.
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ui->horizontalScrollBar->setRange(-500, 500);
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ui->verticalScrollBar->setRange(-500, 500);
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// create connection between axes and scroll bars:
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connect(ui->horizontalScrollBar, SIGNAL(valueChanged(int)), this, SLOT(horzScrollBarChanged(int)));
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connect(ui->verticalScrollBar, SIGNAL(valueChanged(int)), this, SLOT(vertScrollBarChanged(int)));
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connect(ui->customPlot->xAxis, SIGNAL(rangeChanged(QCPRange)), this, SLOT(xAxisChanged(QCPRange)));
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connect(ui->customPlot->yAxis, SIGNAL(rangeChanged(QCPRange)), this, SLOT(yAxisChanged(QCPRange)));
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// initialize axis range (and scroll bar positions via signals we just connected):
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ui->customPlot->xAxis->setRange(0, 6, Qt::AlignCenter);
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ui->customPlot->yAxis->setRange(0, 10, Qt::AlignCenter);
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}
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void frmScrollBar::horzScrollBarChanged(int value)
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{
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if (qAbs(ui->customPlot->xAxis->range().center() - value / 100.0) > 0.01) { // if user is dragging plot, we don't want to replot twice
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ui->customPlot->xAxis->setRange(value / 100.0, ui->customPlot->xAxis->range().size(), Qt::AlignCenter);
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ui->customPlot->replot();
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}
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}
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void frmScrollBar::vertScrollBarChanged(int value)
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{
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if (qAbs(ui->customPlot->yAxis->range().center() + value / 100.0) > 0.01) { // if user is dragging plot, we don't want to replot twice
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ui->customPlot->yAxis->setRange(-value / 100.0, ui->customPlot->yAxis->range().size(), Qt::AlignCenter);
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ui->customPlot->replot();
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}
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}
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void frmScrollBar::xAxisChanged(QCPRange range)
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{
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ui->horizontalScrollBar->setValue(qRound(range.center() * 100.0)); // adjust position of scroll bar slider
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ui->horizontalScrollBar->setPageStep(qRound(range.size() * 100.0)); // adjust size of scroll bar slider
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}
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void frmScrollBar::yAxisChanged(QCPRange range)
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{
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ui->verticalScrollBar->setValue(qRound(-range.center() * 100.0)); // adjust position of scroll bar slider
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ui->verticalScrollBar->setPageStep(qRound(range.size() * 100.0)); // adjust size of scroll bar slider
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}
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