Revision as of 10:08, 30 November 2010

Chart

Demonstration: Chart
Java API: Chart
JavaScript API: Chart
Style Guide: N/A
JfreeChart Engine Available in ZK PE and EE only

Employment/Purpose

A chart is used to show a set of data as a graph. It helps users to judge things with a snapshot. To use a chart component , developers must prepare a ChartModel and a ChartEngine. Developers also set proper chart type, and the threeD (3D) attribute to draw proper chart. The model and type must match to each other; or the result is unpredictable. The 3D chart is not supported on all chart type.

Example

Pie Chart

<chart id="mychart" title="Pie Chart Demo" width="550" height="400"
    type="pie" threeD="true" fgAlpha="128">
    <attribute name="onClick"><![CDATA[
        Area area = event.getAreaComponent();
        if (area != null)
            alert(""+area.getAttribute("entity")+":"+area.getTooltiptext());
    ]]></attribute>
    <zscript><![CDATA[
        PieModel model = new SimplePieModel();
        model.setValue("C/C++", new Double(21.2));
        model.setValue("VB", new Double(10.2));
        model.setValue("Java", new Double(40.4));
        model.setValue("PHP", new Double(28.2));
        mychart.setModel(model);
    ]]></zscript>
</chart>

Pie Chart 3D

Ring Chart

Bar Chart

Bar Chart 3D

Stacked Bar

Stacked Bar 3D

Line Chart

Line Bar 3D

File:ZKComRef Chart Line Bar 3D.png

Area Chart

Stacked Area Chart

Waterfall Chart

Polar Chart

Scatter Chart

Time Series Chart

XY Area Chart

XY Line Chart

Step Area Chart

Step Chart

XY Stacked Area Chart

XY Bar Chart

Histogram Chart

Candlestick Chart

High Low Chart

Bubble Chart

Horizontal Bubble Chart

Wafer Map Chart

Gantt Chart

Wind Chart

Dial Chart

Properties

Type and Model

Type	Model	3D
`pie`	`PieModel`	`o`
`ring`	`PieModel`	`x`
`bar`	`CategoryModel` or `XYModel`	`o`
`line`	`CategoryModel` or `XYModel`	`o`
`area`	`CategoryModel` or `XYModel`	`x`
`stacked_bar`	`CategoryModel`	`o`
`stacked_area`	`CategoryModel` or `XYModel`	`x`
`waterfall`	`CategoryModel`	`x`
`polar`	`XYModel`	x
`scatter`	`XYModel`	x
`time_series`	`XYModel`	x
`polar`	`XYModel`	x
`step_area`	`XYModel`	x
`step`	`XYModel`	x
`histogram`	`XYModel`	x
`bubble`	`XYModel`	x
`wind`	`XYModel`	x
`candlestick`	`HiLoModel`	x
`highlow`	`HiLoModel`	x
`wafermap`	`WaferMapModel`	x
`gantt`	`GanttModel`	x
`dial`	`DialModel`	x

The onClick Event

Denotes user has clicked the component. Use MouseEvent.getX() and MouseEvent.getY() method to get coordinates.

Use MouseEvent.getAreaComponent() method to retrieve the area component (Area) which user clicks on.

	
void drilldown(MouseEvent event) {	
  final Component area = event.getAreaComponent();	
  if (area != null)
    Messagebox.show(area.getAttribute("entity")+": "+area.getTooltiptext());
}

Charts Support Setting the Font

We can now specify what font we want a chart to use, this is useful when employing a foreign language within your chart. The example demonstrates setting a font and using it with a foreign language, in this case Chinese.

<vbox>
	<zscript>
		import java.awt.Font;
		String fontname = "Dialog";
		Font tfont = new Font(fontname, Font.BOLD, 16); //for title
		Font lfont = new Font(fontname, Font.PLAIN, 10); //for legend
		Font lbfont = new Font(fontname, Font.PLAIN, 12); //for label


		CategoryModel catmodel = new SimpleCategoryModel();
		catmodel.setValue("2001", "第一季", new Integer(20));
		catmodel.setValue("2001", "第二季", new Integer(35));
		catmodel.setValue("2001", "第三季", new Integer(40));
		catmodel.setValue("2001", "第四季", new Integer(55));
		catmodel.setValue("2002", "第一季", new Integer(40));
		catmodel.setValue("2002", "第二季", new Integer(60));
		catmodel.setValue("2002", "第三季", new Integer(70));
		catmodel.setValue("2002", "第四季", new Integer(90));
	</zscript>

	<chart id="barchart" title="長條圖  Bar Chart" width="500" height="250" type="bar" threeD="false" fgAlpha="128"
	titleFont="${tfont}" legendFont="${lfont}" xAxisFont="${lbfont}" xAxisTickFont="${lbfont}" model="${catmodel}"/>
</vbox>

Supported Events

Name	Inherited From
None	None

Inherited Supported Events: Imagemap

Supported Children

*NONE

Use Cases

Version	Description	Example Location
5.0	Make a Chart fill 100% width in parent panel	http://www.zkoss.org/forum/listComment/10761
5.0	Dual axis in Chart	http://www.zkoss.org/forum/listComment/8752

Version History

Last Update : 2010/11/30

Version	Date	Content
5.0.4	August 2010	MouseEvent introduced a new method, MouseEvent.getAreaComponent(), which simplifies the retrieval of the area component. Area area = (Area)event.getAreaComponent(); //must be Area or null when used with chart if (area != null) ...
5.0.3	June 2010	The area sent with the click event becomes UUID of the area component. Thus, use `desktop.getComponentByUuid(event.getArea())`. To write a program compatible with any version of ZK: String areaid = event.getArea(); if (areaid != null) { Area area = desktop.getComponentByUuidIfAny(areaid); if (area == null) area = chart.getFellow(areaid); //fall back to older version ...