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package org.apache.tapestry.workbench.chart;
import java.awt.Color;
import java.awt.Paint;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.lang.StringUtils;
import org.apache.tapestry.IAsset;
import org.apache.tapestry.IMarkupWriter;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.html.BasePage;
import org.apache.tapestry.valid.IValidationDelegate;
import org.jCharts.Chart;
import org.jCharts.chartData.ChartDataException;
import org.jCharts.chartData.PieChartDataSet;
import org.jCharts.nonAxisChart.PieChart2D;
import org.jCharts.properties.ChartProperties;
import org.jCharts.properties.LegendProperties;
import org.jCharts.properties.PieChart2DProperties;
import org.jCharts.test.TestDataGenerator;
/**
* Demonstrates more complex form handling (including loops and dynamic addition/deletion of
* rows) as well as dynamic image generation using {@link JCharts}.
*
* @author Howard Lewis Ship, Luis Neves
* @version $Id: ChartPage.java,v 1.3 2003/07/01 20:49:34 hlship Exp $
* @since 1.0.10
*
**/
public class ChartPage extends BasePage implements IChartProvider
{
private List _plotValues;
private List _removeValues;
private PlotValue _plotValue;
public void initialize()
{
_plotValues = null;
_removeValues = null;
_plotValue = null;
}
/**
* Invokes {@link #getPlotValues()}, which ensures that (on the very first request cycle),
* the persistent values property is set <em>before</em> the page recorder is locked.
*
**/
public void beginResponse(IMarkupWriter writer, IRequestCycle cycle)
{
getPlotValues();
}
public List getPlotValues()
{
if (_plotValues == null)
{
_plotValues = new ArrayList();
_plotValues.add(new PlotValue("Fred", 10));
_plotValues.add(new PlotValue("Barney", 15));
_plotValues.add(new PlotValue("Dino", 7));
fireObservedChange("plotValues", _plotValues);
}
return _plotValues;
}
public void setPlotValues(List plotValues)
{
_plotValues = plotValues;
fireObservedChange("plotValues", plotValues);
}
public PlotValue getPlotValue()
{
return _plotValue;
}
public void setPlotValue(PlotValue plotValue)
{
_plotValue = plotValue;
}
/**
* Invoked during the render; always returns false.
*
**/
public boolean isMarkedForDeletion()
{
return false;
}
/**
* Invoked by the deleted checkbox (for each plotValue). If true,
* the the current plotValue is added to the list of plotValues to
* remove (though the actual removing is done inside {@link #delete(IRequestCycle)},
* after the loop.
*
**/
public void setMarkedForDeletion(boolean value)
{
if (value)
{
if (_removeValues == null)
_removeValues = new ArrayList();
_removeValues.add(_plotValue);
// Deleting things screws up the validation delegate.
// That's because the errors are associated with the form name
// (not the component id), and deleting elements causes
// all the names to shift.
IValidationDelegate delegate = (IValidationDelegate) getBeans().getBean("delegate");
delegate.clear();
}
}
/**
* Form listener method; does nothing since we want to stay on this page.
*
**/
public void submit(IRequestCycle cycle)
{
}
/**
* Listener method for the add button, adds an additional (blank) plot value.
*
**/
public void add(IRequestCycle cycle)
{
List plotValues = getPlotValues();
plotValues.add(new PlotValue());
setPlotValues(plotValues);
}
/**
* Listener method for the remove button, removes any checked plot values.
*
* @see #setMarkedForDeletion(boolean)
*
**/
public void delete(IRequestCycle cycle)
{
if (_removeValues != null)
{
List plotValues = getPlotValues();
plotValues.removeAll(_removeValues);
setPlotValues(plotValues);
}
}
private IAsset chartImageAsset;
public IAsset getChartImageAsset()
{
if (chartImageAsset == null)
chartImageAsset = new ChartAsset(getRequestCycle(), this);
return chartImageAsset;
}
/**
* This method is invoked by the service (in a seperate request cycle from all the form handling stuff).
* The {@link #getChartImageAsset()} method provides an {@link IAsset} that is handled by the
* {@link ChartService}, and the asset encodes the identity of this page.
*
**/
public Chart getChart()
{
LegendProperties legendProperties = new LegendProperties();
legendProperties.setNumColumns(2);
legendProperties.setPlacement(LegendProperties.RIGHT);
ChartProperties chartProperties = new ChartProperties();
chartProperties.setBackgroundPaint(Color.decode("#ffffcc"));
Chart result = new PieChart2D(getData(), legendProperties, chartProperties, 400, 350);
return result;
}
private PieChartDataSet getData()
{
List plotValues = getPlotValues();
int count = plotValues.size();
double[] data = new double[count];
String[] labels = new String[count];
PieChart2DProperties properties = new PieChart2DProperties();
for (int i = 0; i < count; i++)
{
PlotValue pv = (PlotValue) plotValues.get(i);
String name = pv.getName();
if (StringUtils.isEmpty(name))
name = "<New>";
data[i] = new Double(pv.getValue()).doubleValue();
labels[i] = new String(name);
}
Paint[] paints = TestDataGenerator.getRandomPaints(count);
try
{
return new PieChartDataSet("Pie Chart", data, labels, paints, properties);
}
catch (ChartDataException e)
{
return null;
}
}
}