#include <QApplication>
#include <QPushButton>
#include <QMouseEvent>
#include <math.h>
#include <sstream>
#include <algorithm>
#include "zoomscrolltrack.h"
ZoomScrollTrack::ZoomScrollTrack(QWidget *parent) :
QDialog(parent)
{
//
// Set up the GUI
//
setFixedSize(782, 376);
setWindowTitle("Zooming and Scrolling with Track Line (1)");
// The frame on the left side
QFrame *frame = new QFrame(this);
frame->setGeometry(4, 4, 120, 370);
frame->setFrameShape(QFrame::StyledPanel);
// Pointer push button
QPushButton *pointerPB = new QPushButton(QIcon(":/icons/scroll_icon.png"), "Scroll", frame);
pointerPB->setGeometry(4, 8, 112, 28);
pointerPB->setStyleSheet("QPushButton { text-align:left; padding:5px}");
pointerPB->setCheckable(true);
// Zoom In push button
QPushButton *zoomInPB = new QPushButton(QIcon(":/icons/zoomin_icon.png"), "Zoom In", frame);
zoomInPB->setGeometry(4, 36, 112, 28);
zoomInPB->setStyleSheet("QPushButton { text-align:left; padding:5px}");
zoomInPB->setCheckable(true);
// Zoom Out push button
QPushButton *zoomOutPB = new QPushButton(QIcon(":/icons/zoomout_icon.png"), "Zoom Out", frame);
zoomOutPB->setStyleSheet("QPushButton { text-align:left; padding:5px}");
zoomOutPB->setGeometry(4, 64, 112, 28);
zoomOutPB->setCheckable(true);
// The Pointer/Zoom In/Zoom Out buttons form a button group
mouseUsage = new QButtonGroup(frame);
mouseUsage->addButton(pointerPB, Chart::MouseUsageScroll);
mouseUsage->addButton(zoomInPB, Chart::MouseUsageZoomIn);
mouseUsage->addButton(zoomOutPB, Chart::MouseUsageZoomOut);
connect(mouseUsage, SIGNAL(buttonPressed(QAbstractButton*)),
SLOT(onMouseUsageChanged(QAbstractButton*)));
// Clear data button
QPushButton *clearPB = new QPushButton("Clear Data", frame);
clearPB->setStyleSheet("QPushButton { text-align:left; padding:5px}");
clearPB->setGeometry(4, 120, 112, 28);
connect(clearPB, SIGNAL(clicked(bool)), SLOT(onClearData(bool)));
// Chart Viewer
m_ChartViewer = new QChartViewer(this);
m_ChartViewer->setGeometry(128, 4, 650, 350);
connect(m_ChartViewer, SIGNAL(viewPortChanged()), SLOT(onViewPortChanged()));
connect(m_ChartViewer, SIGNAL(mouseMovePlotArea(QMouseEvent*)),
SLOT(onMouseMovePlotArea(QMouseEvent*)));
// Horizontal scroll bar
m_HScrollBar = new QScrollBar(Qt::Horizontal, this);
m_HScrollBar->setGeometry(128, 356, 650, 17);
connect(m_HScrollBar, SIGNAL(valueChanged(int)), SLOT(onHScrollBarChanged(int)));
//
// Initialize the chart
//
// Load the data
loadData();
// Initialize the QChartViewer
initChartViewer(m_ChartViewer);
// Initially set the mouse to drag to scroll mode
pointerPB->click();
// Trigger the ViewPortChanged event to draw the chart
m_ChartViewer->updateViewPort(true, true);
}
ZoomScrollTrack::~ZoomScrollTrack()
{
delete m_ranSeries;
delete m_ChartViewer->getChart();
}
//
// Load the data
//
void ZoomScrollTrack::loadData()
{
// In this example, we just use random numbers as data.
m_ranSeries = new RanSeries(127);
m_timeStamps = m_ranSeries->getDateSeries(1827, Chart::chartTime(2007, 1, 1), 86400);
m_dataSeriesA = m_ranSeries->getSeries(1827, 150, -10, 10);
m_dataSeriesB = m_ranSeries->getSeries(1827, 200, -10, 10);
m_dataSeriesC = m_ranSeries->getSeries(1827, 250, -8, 8);
}
//
// Initialize the QChartViewer
//
void ZoomScrollTrack::initChartViewer(QChartViewer *viewer)
{
// Set the full x range to be the duration of the data
viewer->setFullRange("x", m_timeStamps[0], m_timeStamps[m_timeStamps.len - 1]);
// Initialize the view port to show the latest 20% of the time range
viewer->setViewPortWidth(0.2);
viewer->setViewPortLeft(1 - viewer->getViewPortWidth());
// Enable mouse wheel zooming by setting the zoom ratio to 1.1 per wheel event
viewer->setMouseWheelZoomRatio(1.1);
// Set the maximum zoom to 10 points
viewer->setZoomInWidthLimit(10.0 / m_timeStamps.len);
}
//
// The ViewPortChanged event handler. This event occurs if the user scrolls or zooms in
// or out the chart by dragging or clicking on the chart. It can also be triggered by
// calling WinChartViewer.updateViewPort.
//
void ZoomScrollTrack::onViewPortChanged()
{
// In addition to updating the chart, we may also need to update other controls that
// changes based on the view port.
updateControls(m_ChartViewer);
// Update chart if necessary
if (m_ChartViewer->needUpdateChart())
drawChart(m_ChartViewer);
}
//
// Update controls in the user interface when the view port changed
//
void ZoomScrollTrack::updateControls(QChartViewer *viewer)
{
// The logical length of the scrollbar. It can be any large value. The actual value does
// not matter.
const int scrollBarLen = 1000000000;
// Update the horizontal scroll bar
m_HScrollBar->setEnabled(viewer->getViewPortWidth() < 1);
m_HScrollBar->setPageStep((int)ceil(viewer->getViewPortWidth() * scrollBarLen));
m_HScrollBar->setSingleStep((std::min)(scrollBarLen / 100, m_HScrollBar->pageStep()));
m_HScrollBar->setRange(0, scrollBarLen - m_HScrollBar->pageStep());
m_HScrollBar->setValue((int)(0.5 + viewer->getViewPortLeft() * scrollBarLen));
}
//
// Draw the chart and display it in the given viewer
//
void ZoomScrollTrack::drawChart(QChartViewer *viewer)
{
DoubleArray viewPortTimeStamps;
DoubleArray viewPortDataSeriesA;
DoubleArray viewPortDataSeriesB;
DoubleArray viewPortDataSeriesC;
if (m_timeStamps.len > 0)
{
// Get the start date and end date that are visible on the chart.
double viewPortStartDate = viewer->getValueAtViewPort("x", viewer->getViewPortLeft());
double viewPortEndDate = viewer->getValueAtViewPort("x", viewer->getViewPortLeft() +
viewer->getViewPortWidth());
// Get the array indexes that corresponds to the visible start and end dates
int startIndex = (int)floor(Chart::bSearch(m_timeStamps, viewPortStartDate));
int endIndex = (int)ceil(Chart::bSearch(m_timeStamps, viewPortEndDate));
int noOfPoints = endIndex - startIndex + 1;
// Extract the part of the data array that are visible.
viewPortTimeStamps = DoubleArray(m_timeStamps.data + startIndex, noOfPoints);
viewPortDataSeriesA = DoubleArray(m_dataSeriesA.data + startIndex, noOfPoints);
viewPortDataSeriesB = DoubleArray(m_dataSeriesB.data + startIndex, noOfPoints);
viewPortDataSeriesC = DoubleArray(m_dataSeriesC.data + startIndex, noOfPoints);
}
//
// At this stage, we have extracted the visible data. We can use those data to plot the chart.
//
///////////////////////////////////////////////////////////////////////////////////////
// Configure overall chart appearance.
///////////////////////////////////////////////////////////////////////////////////////
// Create an XYChart object of size 650 x 350 pixels, with a white (ffffff) background and grey
// (aaaaaa) border
XYChart *c = new XYChart(650, 350, 0xffffff, 0xaaaaaa);
// Set the plotarea at (55, 55) with width 90 pixels less than chart width, and height 90 pixels
// less than chart height. Use a vertical gradient from light blue (f0f6ff) to sky blue (a0c0ff)
// as background. Set border to transparent and grid lines to white (ffffff).
c->setPlotArea(55, 55, c->getWidth() - 90, c->getHeight() - 90, c->linearGradientColor(0, 55, 0,
c->getHeight() - 35, 0xf0f6ff, 0xa0c0ff), -1, Chart::Transparent, 0xffffff, 0xffffff);
// As the data can lie outside the plotarea in a zoomed chart, we need enable clipping.
c->setClipping();
// Add a title to the chart using 18 pts Times New Roman Bold Italic font
c->addTitle(" Zooming and Scrolling with Track Line (1)", "Times New Roman Bold Italic", 18);
// Set legend icon style to use line style icon, sized for 8pt font
c->getLegend()->setLineStyleKey();
c->getLegend()->setFontSize(8);
// Set the axis stem to transparent
c->xAxis()->setColors(Chart::Transparent);
c->yAxis()->setColors(Chart::Transparent);
// Add axis title using 10pts Arial Bold Italic font
c->yAxis()->setTitle("Ionic Temperature (C)", "Arial Bold Italic", 10);
///////////////////////////////////////////////////////////////////////////////////////
// Add data to chart
///////////////////////////////////////////////////////////////////////////////////////
//
// In this example, we represent the data by lines. You may modify the code below to use other
// representations (areas, scatter plot, etc).
//
if (m_timeStamps.len > 0)
{
// Add a line layer for the lines, using a line width of 2 pixels
LineLayer *layer = c->addLineLayer();
layer->setLineWidth(2);
// In this demo, we do not have too many data points. In real code, the chart may contain a lot
// of data points when fully zoomed out - much more than the number of horizontal pixels in this
// plot area. So it is a good idea to use fast line mode.
layer->setFastLineMode();
// Now we add the 3 data series to a line layer, using the color red (ff0000), green
// (00cc00) and blue (0000ff)
layer->setXData(viewPortTimeStamps);
layer->addDataSet(viewPortDataSeriesA, 0xff3333, "Alpha");
layer->addDataSet(viewPortDataSeriesB, 0x008800, "Beta");
layer->addDataSet(viewPortDataSeriesC, 0x3333CC, "Gamma");
///////////////////////////////////////////////////////////////////////////////////////
// Configure axis scale and labelling
///////////////////////////////////////////////////////////////////////////////////////
// Set the x-axis as a date/time axis with the scale according to the view port x range.
viewer->syncDateAxisWithViewPort("x", c->xAxis());
//
// In this demo, the time range can be from a few years to a few days. We demonstrate how to set
// up different date/time format based on the time range.
//
// If all ticks are yearly aligned, then we use "yyyy" as the label format.
c->xAxis()->setFormatCondition("align", 360 * 86400);
c->xAxis()->setLabelFormat("{value|yyyy}");
// If all ticks are monthly aligned, then we use "mmm yyyy" in bold font as the first
// label of a year, and "mmm" for other labels.
c->xAxis()->setFormatCondition("align", 30 * 86400);
c->xAxis()->setMultiFormat(Chart::StartOfYearFilter(), "<*font=bold*>{value|mmm yyyy}",
Chart::AllPassFilter(), "{value|mmm}");
// If all ticks are daily algined, then we use "mmm dd<*br*>yyyy" in bold font as the
// first label of a year, and "mmm dd" in bold font as the first label of a month, and
// "dd" for other labels.
c->xAxis()->setFormatCondition("align", 86400);
c->xAxis()->setMultiFormat(Chart::StartOfYearFilter(),
"<*block,halign=left*><*font=bold*>{value|mmm dd<*br*>yyyy}",
Chart::StartOfMonthFilter(), "<*font=bold*>{value|mmm dd}");
c->xAxis()->setMultiFormat(Chart::AllPassFilter(), "{value|dd}");
// For all other cases (sub-daily ticks), use "hh:nn<*br*>mmm dd" for the first label of
// a day, and "hh:nn" for other labels.
c->xAxis()->setFormatCondition("else");
c->xAxis()->setMultiFormat(Chart::StartOfDayFilter(),
"<*font=bold*>{value|hh:nn<*br*>mmm dd}", Chart::AllPassFilter(), "{value|hh:nn}");
///////////////////////////////////////////////////////////////////////////////////////
// Output the chart
///////////////////////////////////////////////////////////////////////////////////////
// We need to update the track line too. If the mouse is moving on the chart (eg. if
// the user drags the mouse on the chart to scroll it), the track line will be updated
// in the MouseMovePlotArea event. Otherwise, we need to update the track line here.
if (!viewer->isInMouseMoveEvent())
{
trackLineLegend(c, (0 == viewer->getChart()) ? c->getPlotArea()->getRightX() :
viewer->getPlotAreaMouseX());
}
}
delete viewer->getChart();
viewer->setChart(c);
}
//
// The Pointer, Zoom In or Zoom out button is pressed
//
void ZoomScrollTrack::onMouseUsageChanged(QAbstractButton *b)
{
m_ChartViewer->setMouseUsage(mouseUsage->id(b));
}
void ZoomScrollTrack::onClearData(bool b)
{
m_timeStamps.len = 0;
m_ChartViewer->updateViewPort(true, true);
}
//
// User clicks on the the horizontal scroll bar
//
void ZoomScrollTrack::onHScrollBarChanged(int value)
{
if (!m_ChartViewer->isInViewPortChangedEvent())
{
// Set the view port based on the scroll bar
int scrollBarLen = m_HScrollBar->maximum() + m_HScrollBar->pageStep();
m_ChartViewer->setViewPortLeft(value / (double)scrollBarLen);
// Update the chart display without updating the image maps. (We can delay updating
// the image map until scrolling is completed and the chart display is stable.)
m_ChartViewer->updateViewPort(true, false);
}
}
//
// Draw track cursor when mouse is moving over plotarea
//
void ZoomScrollTrack::onMouseMovePlotArea(QMouseEvent *)
{
trackLineLegend((XYChart *)m_ChartViewer->getChart(), m_ChartViewer->getPlotAreaMouseX());
m_ChartViewer->updateDisplay();
}
//
// Draw track line with data labels
//
void ZoomScrollTrack::trackLineLegend(XYChart *c, int mouseX)
{
if (m_timeStamps.len <= 0)
return;
// Clear the current dynamic layer and get the DrawArea object to draw on it.
DrawArea *d = c->initDynamicLayer();
// The plot area object
PlotArea *plotArea = c->getPlotArea();
// Get the data x-value that is nearest to the mouse, and find its pixel coordinate.
double xValue = c->getNearestXValue(mouseX);
int xCoor = c->getXCoor(xValue);
// Draw a vertical track line at the x-position
d->vline(plotArea->getTopY(), plotArea->getBottomY(), xCoor, d->dashLineColor(0x000000, 0x0101));
// Container to hold the legend entries
std::vector<std::string> legendEntries;
// Iterate through all layers to build the legend array
for (int i = 0; i < c->getLayerCount(); ++i) {
Layer *layer = c->getLayerByZ(i);
// The data array index of the x-value
int xIndex = layer->getXIndexOf(xValue);
// Iterate through all the data sets in the layer
for (int j = 0; j < layer->getDataSetCount(); ++j) {
DataSet *dataSet = layer->getDataSetByZ(j);
// We are only interested in visible data sets with names
const char *dataName = dataSet->getDataName();
int color = dataSet->getDataColor();
if (dataName && *dataName && (color != (int)Chart::Transparent)) {
// Build the legend entry, consist of the legend icon, name and data value.
double dataValue = dataSet->getValue(xIndex);
std::ostringstream legendEntry;
legendEntry << "<*block*>" << dataSet->getLegendIcon() << " " << dataName << ": " <<
((dataValue == Chart::NoValue) ? "N/A" : c->formatValue(dataValue, "{value|P4}"))
<< "<*/*>";
legendEntries.push_back(legendEntry.str());
// Draw a track dot for data points within the plot area
int yCoor = c->getYCoor(dataSet->getPosition(xIndex), dataSet->getUseYAxis());
if ((yCoor >= plotArea->getTopY()) && (yCoor <= plotArea->getBottomY())) {
d->circle(xCoor, yCoor, 4, 4, color, color);
}
}
}
}
// Create the legend by joining the legend entries
std::ostringstream legendText;
legendText << "<*block,maxWidth=" << plotArea->getWidth() << "*><*block*><*font=Arial Bold*>["
<< c->xAxis()->getFormattedLabel(xValue, "mmm dd, yyyy") << "]<*/*>";
for (int i = ((int)legendEntries.size()) - 1; i >= 0; --i)
legendText << " " << legendEntries[i];
// Display the legend on the top of the plot area
TTFText *t = d->text(legendText.str().c_str(), "Arial", 8);
t->draw(plotArea->getLeftX() + 5, plotArea->getTopY() - 3, 0x000000, Chart::BottomLeft);
t->destroy();
}
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