在使用cewolf 之前,首先来熟悉一下jFreeChart 。这里分三部分来介绍 jFreeChart 。第一部分介绍jFreeChart产生
图形的流程及相关的重要的类;第二部分介绍四种常用的报表图(饼图、柱状图、折线图、时间序列图);第三部分
介绍在图形中增加Item Lable 。
jFreeChart 的版本是jfreechart-1.0.0-pre2(1)
cewolf 的最新版本是cewolf-0.12.0
一、jFreeChart产生图形的流程
1. 创建一个数据源(dataset)来包含将要在图形中显示的数据?
2. 创建一个 JFreeChart 对象来代表要显示的图形
3. 把图形输出
重要的类和接口:
org.jfree.data.general.Dataset 所有数据源类都要实现的接口
org.jfree.chart.ChartFactory 由它来产生 JFreeChart 对象
org.jfree.chart.JFreeChart 所有对图形的调整都是通过它噢!!
org.jfree.chart.plot.Plot 通过JFreeChart 对象获得它,然后再通过它对图形外部部分(例:坐标轴)调整
注意:它有很多子类,一般都下嗍造型到它的子类!
org.jfree.chart.renderer.AbstractRenderer 通过JFreeChart 对象获得它,然后再通过它对图形内部部分
(例:折线的类型)调整。同样,针对不同类型的报表图,它有
着不同的子类实现!在下面我们简称它为 Renderer
下面我们结合不同类型的图形来具体分析这个流程。
二、饼图
饼图的dataset 一般是用PieDataset 接口,具体实现类是 DefaultPieDataset
1、创建一个数据源(dataset):
private
static
PieDataset createDataset()
{
DefaultPieDataset defaultpiedataset = new DefaultPieDataset(); //注意是DefaultPieDataset!!
defaultpiedataset.setValue("One", new Double(43.200000000000003D));
defaultpiedataset.setValue("Two", new Double(10D));
defaultpiedataset.setValue("Three", new Double(27.5D));
defaultpiedataset.setValue("Four", new Double(17.5D));
return defaultpiedataset;
}
2、由ChartFactory 产生 JFreeChart 对象
private
static
JFreeChart createChart(PieDataset piedataset)
{
JFreeChart jfreechart = ChartFactory.createPieChart("Pie Chart Demo 1", //图形标题名称
piedataset, // dataset
true, // legend?
true, // tooltips?
false); //URLs?
PiePlot pieplot = (PiePlot)jfreechart.getPlot(); //通过JFreeChart 对象获得 plot:PiePlot!!
pieplot.setNoDataMessage("No data available"); // 没有数据的时候显示的内容
return jfreechart;
}
一些重要的方法:
pieplot.setExplodePercent(0,0.3D) //把Lable 为"One" 的那一块”挖“出来30%
3、输出略
三、柱状图
柱状图的dataset 一般是用CatagoryDataset接口(具体实现类是DefaultCategoryDataset),也会用 IntervalXYDataset
接口
1、创建一个数据源(dataset):
private
static
CategoryDataset createDataset()
{
String series1 = "First";
String series2 = "Second";
String series3 = "Third";
String category1 = "Category 1";
String category2 = "Category 2";
String category3 = "Category 3";
String category4 = "Category 4";
String category5 = "Category 5";
DefaultCategoryDataset defaultcategorydataset = new DefaultCategoryDataset();
defaultcategorydataset.addValue(1.0D, series1, category1);
defaultcategorydataset.addValue(4D, series1, category2);
defaultcategorydataset.addValue(3D, series1, category3);
defaultcategorydataset.addValue(5D, series1, category4);
defaultcategorydataset.addValue(5D, series1, category5);
defaultcategorydataset.addValue(5D, series2, category1);
defaultcategorydataset.addValue(7D, series2, category2);
defaultcategorydataset.addValue(6D, series2, category3);
defaultcategorydataset.addValue(8D, series2, category4);
defaultcategorydataset.addValue(4D, series2, category5);
defaultcategorydataset.addValue(4D, series3, category1);
defaultcategorydataset.addValue(3D, series3, category2);
defaultcategorydataset.addValue(2D, series3, category3);
defaultcategorydataset.addValue(3D, series3, category4);
defaultcategorydataset.addValue(6D, series3, category5);
return defaultcategorydataset;
}
2、由ChartFactory 产生 JFreeChart 对象
private static
JFreeChart createChart(CategoryDataset categorydataset)
{
JFreeChart jfreechart = ChartFactory.createBarChart("Bar Chart Demo", //图形标题名称
"Category",//domain 轴 Lable
这里先简单理解为横坐标Lable好了
"Value", //range 轴 Lable
这里也先简单理解为纵坐标Lable好了
categorydataset, // dataset
PlotOrientation.VERTICAL, //垂直显示
true, // legend?
true, // tooltips?
false); //URLs?
jfreechart.setBackgroundPaint(Color.white); //设定背景色为白色
CategoryPlot categoryplot = jfreechart.getCategoryPlot(); //获得 plot:CategoryPlot!!
categoryplot.setBackgroundPaint(Color.lightGray); //设定图表数据显示部分背景色
categoryplot.setDomainGridlinePaint(Color.white); //横坐标网格线白色
categoryplot.setDomainGridlinesVisible(true); //可见
categoryplot.setRangeGridlinePaint(Color.white); //纵坐标网格线白色
//下面两行使纵坐标的最小单位格为整数
NumberAxis numberaxis = (NumberAxis)categoryplot.getRangeAxis();
numberaxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
BarRenderer barrenderer = (BarRenderer)categoryplot.getRenderer(); //获得renderer 注意这里是下嗍造型
到BarRenderer!!
barrenderer.setDrawBarOutline(false); // Bar的外轮廓线不画
GradientPaint gradientpaint = new GradientPaint(0.0F, 0.0F, Color.blue,
0.0F, 0.0F, new Color(0, 0, 64)); //设定特定颜色
GradientPaint gradientpaint1 = new GradientPaint(0.0F, 0.0F, Color.green,
0.0F, 0.0F, new Color(0, 64, 0));
GradientPaint gradientpaint2 = new GradientPaint(0.0F, 0.0F, Color.red,
0.0F, 0.0F, new Color(64, 0, 0));
barrenderer.setSeriesPaint(0, gradientpaint); //给series1 Bar设定上面定义的颜色
barrenderer.setSeriesPaint(1, gradientpaint1); //给series2 Bar 设定上面定义的颜色
barrenderer.setSeriesPaint(2, gradientpaint2); //给series3 Bar 设定上面定义的颜色
CategoryAxis categoryaxis = categoryplot.getDomainAxis(); //横轴上的 Lable 45度倾斜
categoryaxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);
return jfreechart;
}
一些重要的方法:(增加一块标记)
IntervalMarker intervalmarker = new IntervalMarker(4.5D, 7.5D);
intervalmarker.setLabel("Target Range");
intervalmarker.setLabelFont(new Font("SansSerif", 2, 11));
intervalmarker.setLabelAnchor(RectangleAnchor.LEFT);
intervalmarker.setLabelTextAnchor(TextAnchor.CENTER_LEFT);
intervalmarker.setPaint(new Color(222, 222, 255, 128));
categoryplot.addRangeMarker(intervalmarker, Layer.BACKGROUND);
四、折线图
折线图的dataset 两种CatagoryDataset接口(具体实现类是DefaultCategoryDataset),XYDataset 接口
1、CatagoryDataset接口:
A、创建一个数据源(dataset):
private static CategoryDataset createDataset()
{
String series1 = "First";
String series2 = "Second";
String series3 = "Third";
String type1 = "Type 1";
String type2 = "Type 2";
String type3 = "Type 3";
String type4 = "Type 4";
String type5 = "Type 5";
String type6 = "Type 6";
String type7 = "Type 7";
String type8 = "Type 8";
DefaultCategoryDataset defaultcategorydataset = new DefaultCategoryDataset();
defaultcategorydataset.addValue(1.0D, series1, type1);
defaultcategorydataset.addValue(4D, series1, type2);
defaultcategorydataset.addValue(3D, series1, type3);
defaultcategorydataset.addValue(5D, series1, type4);
defaultcategorydataset.addValue(5D, series1, type5);
defaultcategorydataset.addValue(7D, series1, type6);
defaultcategorydataset.addValue(7D, series1, type7);
defaultcategorydataset.addValue(8D, series1, type8);
defaultcategorydataset.addValue(5D, series2, type1);
defaultcategorydataset.addValue(7D, series2, type2);
defaultcategorydataset.addValue(6D, series2, type3);
defaultcategorydataset.addValue(8D, series2, type4);
defaultcategorydataset.addValue(4D, series2, type5);
defaultcategorydataset.addValue(4D, series2, type6);
defaultcategorydataset.addValue(2D, series2, type7);
defaultcategorydataset.addValue(1.0D, series2, type8);
defaultcategorydataset.addValue(4D, series3, type1);
defaultcategorydataset.addValue(3D, series3, type2);
defaultcategorydataset.addValue(2D, series3, type3);
defaultcategorydataset.addValue(3D, series3, type4);
defaultcategorydataset.addValue(6D, series3, type5);
defaultcategorydataset.addValue(3D, series3, type6);
defaultcategorydataset.addValue(4D, series3, type7);
defaultcategorydataset.addValue(3D, series3, type8);
return defaultcategorydataset;
}
B、由ChartFactory 产生 JFreeChart 对象 (与上面重复的部分就不再注释)
private static JFreeChart createChart(CategoryDataset categorydataset)
{
JFreeChart jfreechart = ChartFactory.createLineChart("Line Chart Demo 1",
"Type",
"Value",
categorydataset,
PlotOrientation.VERTICAL,
true,
true,
false);
jfreechart.setBackgroundPaint(Color.white);
CategoryPlot categoryplot = (CategoryPlot)jfreechart.getPlot();
categoryplot.setBackgroundPaint(Color.lightGray);
categoryplot.setRangeGridlinePaint(Color.white);
NumberAxis numberaxis = (NumberAxis)categoryplot.getRangeAxis();
numberaxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
numberaxis.setAutoRangeIncludesZero(true);
//获得renderer 注意这里是下嗍造型到lineandshaperenderer!!
LineAndShapeRenderer lineandshaperenderer = (LineAndShapeRenderer)categoryplot.getRenderer();
lineandshaperenderer.setShapesVisible(true); //series 点(即数据点)可见
lineandshaperenderer.setSeriesStroke(0, new BasicStroke(2.0F, 1, 1, 1.0F, new float[] {
10F, 6F
}, 0.0F)); //定义series为"First"的(即series1)点之间的连线 ,这里是虚线,默认是直线
lineandshaperenderer.setSeriesStroke(1, new BasicStroke(2.0F, 1, 1, 1.0F, new float[] {
6F, 6F
}, 0.0F)); //定义series为"Second"的(即series2)点之间的连线
lineandshaperenderer.setSeriesStroke(2, new BasicStroke(2.0F, 1, 1, 1.0F, new float[] {
2.0F, 6F
}, 0.0F)); //定义series为"Third"的(即series3)点之间的连线
return jfreechart;
}
一些重要的方法:
lineandshaperenderer.setLineVisible(true) //series 点(即数据点)间有连线可见
2、XYDataset 接口:
A、创建一个数据源(dataset):
private static XYDataset createDataset()
{
XYSeries xyseries = new XYSeries("First"); //先产生XYSeries 对象
xyseries.add(1.0D, 1.0D);
xyseries.add(2D, 4D);
xyseries.add(3D, 3D);
xyseries.add(4D, 5D);
xyseries.add(5D, 5D);
xyseries.add(6D, 7D);
xyseries.add(7D, 7D);
xyseries.add(8D, 8D);
XYSeries xyseries1 = new XYSeries("Second");
xyseries1.add(1.0D, 5D);
xyseries1.add(2D, 7D);
xyseries1.add(3D, 6D);
xyseries1.add(4D, 8D);
xyseries1.add(5D, 4D);
xyseries1.add(6D, 4D);
xyseries1.add(7D, 2D);
xyseries1.add(8D, 1.0D);
XYSeries xyseries2 = new XYSeries("Third");
xyseries2.add(3D, 4D);
xyseries2.add(4D, 3D);
xyseries2.add(5D, 2D);
xyseries2.add(6D, 3D);
xyseries2.add(7D, 6D);
xyseries2.add(8D, 3D);
xyseries2.add(9D, 4D);
xyseries2.add(10D, 3D);
XYSeriesCollection xyseriescollection = new XYSeriesCollection(); //再用XYSeriesCollection添加入XYSeries 对象
xyseriescollection.addSeries(xyseries);
xyseriescollection.addSeries(xyseries1);
xyseriescollection.addSeries(xyseries2);
return xyseriescollection;
}