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Bug #4289 ยป ChartsExample.C

Bruce Toll, 07/03/2015 07:01 PM

 
/*
* Copyright (C) 2008 Emweb bvba, Kessel-Lo, Belgium.
*
* See the LICENSE file for terms of use.
*/

#include <math.h>
#include <fstream>

#include "ChartsExample.h"
#include "ChartConfig.h"
#include "CsvUtil.h"

#include <Wt/WApplication>
#include <Wt/WDate>
#include <Wt/WEnvironment>
#include <Wt/WItemDelegate>
#include <Wt/WStandardItemModel>
#include <Wt/WText>

#include <Wt/WBorderLayout>
#include <Wt/WFitLayout>
#include <Wt/WVBoxLayout>

#include <Wt/WStandardItem>
#include <Wt/WTableView>

#include <Wt/Chart/WCartesianChart>
#include <Wt/Chart/WPieChart>

using namespace Wt;
using namespace Wt::Chart;

namespace {

/*
* A standard item which converts text edits to numbers
*/
class NumericItem : public WStandardItem {
public:
virtual NumericItem *clone() const {
return new NumericItem();
}

virtual void setData(const boost::any &data, int role = UserRole) {
boost::any dt;

if (role == EditRole) {
std::string s = Wt::asString(data).toUTF8();
char *endptr;
double d = strtod(s.c_str(), &endptr);
if (*endptr == 0)
dt = boost::any(d);
else
dt = data;
}

WStandardItem::setData(data, role);
}
};

/*
* Reads a CSV file as an (editable) standard item model.
*/
WAbstractItemModel *readCsvFile(const std::string &fname,
WContainerWidget *parent)
{
WStandardItemModel *model = new WStandardItemModel(0, 0, parent);
model->setItemPrototype(new NumericItem());
std::ifstream f(fname.c_str());

if (f) {
readFromCsv(f, model);

for (int row = 0; row < model->rowCount(); ++row)
for (int col = 0; col < model->columnCount(); ++col) {
model->item(row, col)->setFlags(ItemIsSelectable | ItemIsEditable);

/*
Example of tool tips (disabled here because they are not updated
when editing data)
*/

/*
WString toolTip = asString(model->headerData(col)) + ": "
+ asString(model->item(row, col)->data(DisplayRole), "%.f");
model->item(row, col)->setToolTip(toolTip);
*/
}

return model;
} else {
WString error(WString::tr("error-missing-data"));
error.arg(fname, UTF8);
new WText(error, parent);
return 0;
}
}
}

ChartsExample::ChartsExample(WContainerWidget *root)
: WContainerWidget(root)
{
new WText(WString::tr("introduction"), this);

new CategoryExample(this);
new TimeSeriesExample(this);
new ScatterPlotExample(this);
new PieExample(this);
}

CategoryExample::CategoryExample(Wt::WContainerWidget *parent):
WContainerWidget(parent)
{
new WText(WString::tr("category chart"), this);

WAbstractItemModel *model
= readCsvFile(WApplication::appRoot() + "category.csv", this);

if (!model)
return;

// Show a view that allows editing of the model.
WContainerWidget *w = new WContainerWidget(this);
WTableView *table = new WTableView(w);

table->setMargin(10, Top | Bottom);
table->setMargin(WLength::Auto, Left | Right);

table->setModel(model);
table->setSortingEnabled(true);
table->setColumnResizeEnabled(true);
// table->setSelectionMode(ExtendedSelection);
table->setAlternatingRowColors(true);
table->setColumnAlignment(0, AlignCenter);
table->setHeaderAlignment(0, AlignCenter);
table->setRowHeight(22);

// Editing does not really work without Ajax, it would require an
// additional button somewhere to confirm the edited value.
if (WApplication::instance()->environment().ajax()) {
table->resize(600, 20 + 5*22);
table->setEditTriggers(WAbstractItemView::SingleClicked);
} else {
table->resize(600, WLength::Auto);
table->setEditTriggers(WAbstractItemView::NoEditTrigger);
}

// We use a single delegate for all items which rounds values to
// the closest integer value.
WItemDelegate *delegate = new WItemDelegate(this);
delegate->setTextFormat("%.f");
table->setItemDelegate(delegate);

table->setColumnWidth(0, 80);
for (int i = 1; i < model->columnCount(); ++i)
table->setColumnWidth(i, 120);

/*
* Create the category chart.
*/
WCartesianChart *chart = new WCartesianChart(this);
// chart->setPreferredMethod(WPaintedWidget::PngImage);
chart->setModel(model); // set the model
chart->setXSeriesColumn(0); // set the column that holds the categories
chart->setLegendEnabled(true); // enable the legend
chart->setZoomEnabled(true);
chart->setPanEnabled(true);
chart->setCrosshairEnabled(true);

// Automatically layout chart (space for axes, legend, ...)
chart->setAutoLayoutEnabled(true);

chart->setBackground(WColor(200,200,200));

/*
* Add all (but first) column as bar series
*/
for (int i = 1; i < model->columnCount(); ++i) {
WDataSeries s(i, BarSeries);
s.setShadow(WShadow(3, 3, WColor(0, 0, 0, 127), 3));
chart->addSeries(s);
}

chart->resize(800, 400);

chart->setMargin(10, Top | Bottom);
chart->setMargin(WLength::Auto, Left | Right);

/*
* Provide a widget to manipulate chart properties
*/
new ChartConfig(chart, this);
}

TimeSeriesExample::TimeSeriesExample(Wt::WContainerWidget *parent):
WContainerWidget(parent)
{
new WText(WString::tr("scatter plot"), this);

WAbstractItemModel *model = readCsvFile(
WApplication::appRoot() + "timeseries.csv", this);

if (!model)
return;

/*
* Parses the first column as dates, to be able to use a date scale
*/
for (int i = 0; i < model->rowCount(); ++i) {
WString s = asString(model->data(i, 0));
WDate d = WDate::fromString(s, "dd/MM/yy");
model->setData(i, 0, d);
}

// Show a view that allows editing of the model.
WContainerWidget *w = new WContainerWidget(this);
WTableView *table = new WTableView(w);

table->setMargin(10, Top | Bottom);
table->setMargin(WLength::Auto, Left | Right);

table->setModel(model);
table->setSortingEnabled(false); // Does not make much sense for time series
table->setColumnResizeEnabled(true);
table->setSelectionMode(NoSelection);
table->setAlternatingRowColors(true);
table->setColumnAlignment(0, AlignCenter);
table->setHeaderAlignment(0, AlignCenter);
table->setRowHeight(22);

// Editing does not really work without Ajax, it would require an
// additional button somewhere to confirm the edited value.
if (WApplication::instance()->environment().ajax()) {
table->resize(800, 20 + 5*22);
table->setEditTriggers(WAbstractItemView::SingleClicked);
} else {
table->resize(800, 20 + 5*22 + 25);
table->setEditTriggers(WAbstractItemView::NoEditTrigger);
}

WItemDelegate *delegate = new WItemDelegate(this);
delegate->setTextFormat("%.1f");
table->setItemDelegate(delegate);
table->setItemDelegateForColumn(0, new WItemDelegate(this));

table->setColumnWidth(0, 80);
for (int i = 1; i < model->columnCount(); ++i)
table->setColumnWidth(i, 90);

/*
* Create the scatter plot.
*/
WCartesianChart *chart = new WCartesianChart(this);
//chart->setPreferredMethod(WPaintedWidget::PngImage);
//chart->setBackground(gray);
chart->setModel(model); // set the model
chart->setXSeriesColumn(0); // set the column that holds the X data
chart->setLegendEnabled(true); // enable the legend
chart->setZoomEnabled(true);
chart->setPanEnabled(true);
chart->setCrosshairEnabled(true);

chart->setType(ScatterPlot); // set type to ScatterPlot
chart->axis(XAxis).setScale(DateScale); // set scale of X axis to DateScale

// Automatically layout chart (space for axes, legend, ...)
chart->setAutoLayoutEnabled();

chart->setBackground(WColor(200,200,200));
/*
* Add first two columns as line series
*/
for (int i = 1; i < 3; ++i) {
WDataSeries s(i, LineSeries);
s.setShadow(WShadow(3, 3, WColor(0, 0, 0, 127), 3));
chart->addSeries(s);
}

chart->resize(800, 400); // WPaintedWidget must be given explicit size

chart->setMargin(10, Top | Bottom); // add margin vertically
chart->setMargin(WLength::Auto, Left | Right); // center horizontally

new ChartConfig(chart, this);
}

ScatterPlotExample::ScatterPlotExample(WContainerWidget *parent):
WContainerWidget(parent)
{
new WText(WString::tr("scatter plot 2"), this);

WStandardItemModel *model = new WStandardItemModel(40, 2, this);
model->setItemPrototype(new NumericItem());
model->setHeaderData(0, WString("X"));
model->setHeaderData(1, WString("Y = sin(X)"));

for (unsigned i = 0; i < 40; ++i) {
double x = (static_cast<double>(i) - 20) / 4;

model->setData(i, 0, x);
model->setData(i, 1, sin(x));
}
/*
* Create the scatter plot.
*/
WContainerWidget *holder = new WContainerWidget(this);
holder->setLayout(new WVBoxLayout());

WCartesianChart *chart = new WCartesianChart();
holder->layout()->addWidget(chart);

chart->setModel(model); // set the model
chart->setXSeriesColumn(0); // set the column that holds the X data
chart->setLegendEnabled(true); // enable the legend

/*
* Axes do not appear if these are enabled (within layout)
*/
#if 1
chart->setZoomEnabled(true);
chart->setPanEnabled(true);
chart->setCrosshairEnabled(true);
#endif

chart->setType(ScatterPlot); // set type to ScatterPlot

// Typically, for mathematical functions, you want the axes to cross
// at the 0 mark:
#if 0
chart->axis(XAxis).setLocation(ZeroValue);
chart->axis(YAxis).setLocation(ZeroValue);
#endif

// Automatically layout chart (space for axes, legend, ...)
chart->setAutoLayoutEnabled();

// Add the curves
WDataSeries s(1, CurveSeries);
s.setShadow(WShadow(3, 3, WColor(0, 0, 0, 127), 3));
chart->addSeries(s);

holder->resize(800, 300);

holder->setMargin(10, Top | Bottom); // add margin vertically
holder->setMargin(WLength::Auto, Left | Right); // center horizontally

ChartConfig *config = new ChartConfig(chart, this);
config->setValueFill(ZeroValueFill);
}

PieExample::PieExample(WContainerWidget *parent):
WContainerWidget(parent)
{
new WText(WString::tr("pie chart"), this);

WStandardItemModel *model = new WStandardItemModel(this);
model->setItemPrototype(new NumericItem());
//headers
model->insertColumns(model->columnCount(), 2);
model->setHeaderData(0, WString("Item"));
model->setHeaderData(1, WString("Sales"));

//data
model->insertRows(model->rowCount(), 6);
int row = 0;
model->setData(row, 0, WString("Blueberry"));
model->setData(row, 1, 120);
// model->setData(row, 1, WString("Blueberry"), ToolTipRole);
row++;
model->setData(row, 0, WString("Cherry"));
model->setData(row, 1, 30);
row++;
model->setData(row, 0, WString("Apple"));
model->setData(row, 1, 260);
row++;
model->setData(row, 0, WString("Boston Cream"));
model->setData(row, 1, 160);
row++;
model->setData(row, 0, WString("Other"));
model->setData(row, 1, 40);
row++;
model->setData(row, 0, WString("Vanilla Cream"));
model->setData(row, 1, 120);
row++;

//set all items to be editable and selectable
for (int row = 0; row < model->rowCount(); ++row)
for (int col = 0; col < model->columnCount(); ++col)
model->item(row, col)->setFlags(ItemIsSelectable | ItemIsEditable);

WContainerWidget *w = new WContainerWidget(this);
WTableView* table = new WTableView(w);

table->setMargin(10, Top | Bottom);
table->setMargin(WLength::Auto, Left | Right);
table->setSortingEnabled(true);
table->setModel(model);
table->setColumnWidth(1, 100);
table->setRowHeight(22);

if (WApplication::instance()->environment().ajax()) {
table->resize(150 + 100 + 14, 20 + 6 * 22);
table->setEditTriggers(WAbstractItemView::SingleClicked);
} else {
table->resize(150 + 100 + 14, WLength::Auto);
table->setEditTriggers(WAbstractItemView::NoEditTrigger);
}

/*
* Create the pie chart.
*/
WPieChart *chart = new WPieChart(this);
chart->setModel(model); // set the model
chart->setLabelsColumn(0); // set the column that holds the labels
chart->setDataColumn(1); // set the column that holds the data

// configure location and type of labels
chart->setDisplayLabels(Outside | TextLabel | TextPercentage);

// enable a 3D and shadow effect
chart->setPerspectiveEnabled(true, 0.2);
chart->setShadowEnabled(true);

// explode the first item
chart->setExplode(0, 0.3);

chart->resize(800, 300); // WPaintedWidget must be given an explicit size

chart->setMargin(10, Top | Bottom); // add margin vertically
chart->setMargin(WLength::Auto, Left | Right); // center horizontally
}

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