使用JFreeChart生成多饼图时，如何设置其布局，如将生成的多个饼图设置成一行或多行，行数由自己控制，使用
ChartFactory.createMultiplePieChart(
"Multiple Pie Chart", // chart title
dataset, // dataset
TableOrder.BY_ROW,
true, // include legend
true,
false
);
可以生成多个饼图，但是不知如何控制其布局，如何将饼图显示为一行，请高手赐教，谢谢！
ChartFactory.createMultiplePieChart(
"Multiple Pie Chart", // chart title
dataset, // dataset
TableOrder.BY_ROW,
true, // include legend
true,
false
);
可以生成多个饼图，但是不知如何控制其布局，如何将饼图显示为一行，请高手赐教，谢谢！
用java图形用户界面来做那就用java的布局管理器类来做如下：
JPanel panel = new JPanel(new GridLayout(2, 2));
//new GridLayout(2, 2)网格型的布局处理器，就是把容器被分成大小相等的矩形，一个矩形中放置一个组件。这是个2行*2列的布局
DefaultCategoryDataset dataset=new DefaultCategoryDataset();
dataset.addValue(23.3, "Section 1", "Section");
dataset.addValue(56.5, "Section 2", "Section");
dataset.addValue(43.3, "Section 3", "Section");
dataset.addValue(11.1, "Section 4", "Section");
JFreeChart chart1 = ChartFactory.createMultiplePieChart("Multiple Pie Chart", dataset,TableOrder.BY_ROW,
true,true, false );
panel.add(new ChartPanel(chart1));
panel.setPreferredSize(new Dimension(800, 600));//设置整个画布的大小
这样你生成的图就会是2行*2列的，要其他的只要改new GridLayout(2, 2)这个就好了。还有其他多种布局方式，如FlowLayout,BorderLayout
但是不是很好用，会比较复杂点。
这要看你是用什么方法做饼图了。
如果是通过jfreechart+cewolf 那就不懂了。
如果想要有多个不同的图。
JPanel panel = new JPanel(new GridLayout(2, 3));
DefaultCategoryDataset dataset=new DefaultCategoryDataset();
dataset.setValue("Section 1", 23.3);
dataset.setValue("Section 2", 56.5);
dataset.setValue("Section 3", 43.3);
dataset.setValue("Section 4", 11.1);
JFreeChart chart1 = ChartFactory.createPieChart("Chart 1", dataset,
false, false, false);
JFreeChart chart2 = ChartFactory.createPieChart("Chart 2", dataset,
false, false, false);
JFreeChart chart3 = ChartFactory.createPieChart("Chart 2", dataset,
false, false, false);
JFreeChart chart4 = ChartFactory.createPieChart("Chart 2", dataset,
false, false, false);
panel.add(new ChartPanel(chart1));
panel.add(new ChartPanel(chart2));
panel.add(new ChartPanel(chart3));
panel.add(new ChartPanel(chart4)); panel.setPreferredSize(new Dimension(800, 600));
分析你的代码，个人理解，在使用
ChartFactory.createMultiplePieChart("Multiple Pie Chart", dataset,TableOrder.BY_ROW, true, true, false );
就已经画出饼图并布局好了，要修改布局，可能要在饼图创建之前修改，而你的方法是在饼图完全生成后才在布局，应该是没有效果的吧。
* Creates a new demo instance.
*
* @param title the frame title.
*/
public PieChartDemo1(String title) {
super(title);
setContentPane(createDemoPanel());
} /**
* Creates a panel for the demo (used by SuperDemo.java).
*
* @return A panel.
*/
public static JPanel createDemoPanel() {
//-----------这是相同数据源的多个图的布局----2行3列
JPanel panel = new JPanel(new GridLayout(2, 3));
DefaultCategoryDataset dataset=new DefaultCategoryDataset();
dataset.addValue(23.3, "Section 1", "Section");
dataset.addValue(56.5, "Section 2", "Section");
dataset.addValue(43.3, "Section 3", "Section");
dataset.addValue(11.1, "Section 4", "Section");
dataset.addValue(11.1, "Section 5", "Section");
JFreeChart chart1 = ChartFactory.createMultiplePieChart("Multiple Pie Chart", dataset,TableOrder.BY_ROW, true,true, false ); chart1.addSubtitle(new TextTitle("setCircular(true);",
new Font("Dialog", Font.PLAIN, 12)));
panel.add(new ChartPanel(chart1));
panel.setPreferredSize(new Dimension(800, 600));
return panel;
}
/**
* The starting point for the demo.
*
* @param args ignored.
*/
public static void main(String[] args) {
PieChartDemo5 demo = new PieChartDemo5("Pie Chart Demo 5");
demo.pack();
int j=i;
RefineryUtilities.centerFrameOnScreen(demo);
demo.setVisible(true);
}}
PieChartDemo1 demo = new PieChartDemo1("Pie Chart Demo 5");
* Creates a new demo instance.
*
* @param title the frame title.
*/
static int i=0;
public PieChartDemo2(String title) {
super(title);
setContentPane(createDemoPanel());
} /**
* Creates a panel for the demo (used by SuperDemo.java).
*
* @return A panel.
*/
public static JPanel createDemoPanel() {
// -------多个不同数据源的布局----你要都在一行可以设成1行多列。比如1*3
//------要多个不同数据的图，，你只要定义多个DefaultPieDataset取得多个不同的数据。然后填充进去就好了
JPanel panel = new JPanel(new GridLayout(1, 3));
DefaultPieDataset dataset1 = new DefaultPieDataset();
dataset1.setValue("Section 1", 23.3);
dataset1.setValue("Section 2", 56.5);
dataset1.setValue("Section 3", 43.3);
dataset1.setValue("Section 4", 11.1); JFreeChart chart1 = ChartFactory.createPieChart("Chart 2", dataset1,
false, false, false);
chart1.addSubtitle(new TextTitle("setCircular(false);",
new Font("Dialog", Font.PLAIN, 12)));//设置标题
PiePlot plot2 = (PiePlot) chart1.getPlot();
plot2.setCircular(false);//设置饼图是否为正圆。false饼图会不够圆，有点扁。
DefaultPieDataset dataset2 = new DefaultPieDataset();
dataset2.setValue("demo 1", 23.3);
dataset2.setValue("demo 2", 56.5);
dataset2.setValue("demo 3", 43.3);
dataset2.setValue("demo 4", 11.1);
JFreeChart chart2 = ChartFactory.createPieChart3D("Chart 3", dataset2,
false, false, false);
chart2.addSubtitle(new TextTitle("setCircular(true);",
new Font("Dialog", Font.PLAIN, 12)));
PiePlot3D plot3 = (PiePlot3D) chart2.getPlot();
plot3.setForegroundAlpha(0.6f);
plot3.setCircular(true); panel.add(new ChartPanel(chart1));
panel.add(new ChartPanel(chart2));
panel.setPreferredSize(new Dimension(800, 600));
return panel;
}
/**
* The starting point for the demo.
*
* @param args ignored.
*/
public static void main(String[] args) {
PieChartDemo2 demo = new PieChartDemo2("Pie Chart Demo 2");
demo.pack();
int j=i;
RefineryUtilities.centerFrameOnScreen(demo);
demo.setVisible(true);
}}
那是因为整个图的大小是有限的。你怎么可能在一行放那么多图呢？而且如你所说上百个图怎么可能放在一行上？jfreechart这东西本来就是一个数据源对应一个图的。估计你的数据源的个数是动态的这比较麻烦。能力有限帮不了你啦兄弟。jfreechart还有很多高级应该偶也不会，只是网上很少这东西的高级应该。而jfreechart的那个开发指南是收费的。好像有点贵。(*^__^*) 嘻嘻……。
今天我跟了一下JFreeChart的源码，发现有一个draw方法控制了布局，通过修改该方法可以将同一数据源的所有饼图放在同一行中。
在类 MultiplePiePlot 中约341行左右有一方法draw，JFreeChart通过该方法生成饼图，在该方法中有两个参数 displayCols 和 displayRows 一个是控制列数一个是控制行数，我将列数修改为饼图个数，行数改为1，就可以实现多个饼图放在同一行中，方法如下。
public void draw(Graphics2D g2,
Rectangle2D area
Point2D anchor,
PlotState parentState,
PlotRenderingInfo info) {
// adjust the drawing area for the plot insets (if any)...
RectangleInsets insets = getInsets();
insets.trim(area);
drawBackground(g2, area);
drawOutline(g2, area);
// check that there is some data to display...
if (DatasetUtilities.isEmptyOrNull(this.dataset)) {
drawNoDataMessage(g2, area);
return;
} int pieCount = 0;
if (this.dataExtractOrder == TableOrder.BY_ROW) {
pieCount = this.dataset.getRowCount();
}
else {
pieCount = this.dataset.getColumnCount();
}
//Begin modify by dofare 在一行中显示多个饼图
/*
// the columns variable is always >= rows
int displayCols = (int) Math.ceil(Math.sqrt(pieCount));
int displayRows
= (int) Math.ceil((double) pieCount / (double) displayCols); // swap rows and columns to match plotArea shape
if (displayCols > displayRows && area.getWidth() < area.getHeight()) {
int temp = displayCols;
displayCols = displayRows;
displayRows = temp;
}
*/
int displayCols = pieCount;
int displayRows = 1;
//End modify by dofare 在一行中显示多个饼图 prefetchSectionPaints();
int x = (int) area.getX();
int y = (int) area.getY();
int width = ((int) area.getWidth()) / displayCols;
int height = ((int) area.getHeight()) / displayRows;
int row = 0;
int column = 0;
int diff = (displayRows * displayCols) - pieCount;
int xoffset = 0;
Rectangle rect = new Rectangle(); for (int pieIndex = 0; pieIndex < pieCount; pieIndex++) {
rect.setBounds(x + xoffset + (width * column), y + (height * row),
width, height); String title = null;
if (this.dataExtractOrder == TableOrder.BY_ROW) {
title = this.dataset.getRowKey(pieIndex).toString();
}
else {
title = this.dataset.getColumnKey(pieIndex).toString();
}
this.pieChart.setTitle(title);
PieDataset piedataset = null;
PieDataset dd = new CategoryToPieDataset(this.dataset,
this.dataExtractOrder, pieIndex);
if (this.limit > 0.0) {
piedataset = DatasetUtilities.createConsolidatedPieDataset(
dd, this.aggregatedItemsKey, this.limit);
}
else {
piedataset = dd;
}
PiePlot piePlot = (PiePlot) this.pieChart.getPlot();
piePlot.setDataset(piedataset);
piePlot.setPieIndex(pieIndex);
// update the section colors to match the global colors...
for (int i = 0; i < piedataset.getItemCount(); i++) {
Comparable key = piedataset.getKey(i);
Paint p;
if (key.equals(this.aggregatedItemsKey)) {
p = this.aggregatedItemsPaint;
}
else {
p = (Paint) this.sectionPaints.get(key);
}
piePlot.setSectionPaint(key, p);
}
ChartRenderingInfo subinfo = null;
if (info != null) {
subinfo = new ChartRenderingInfo();
}
this.pieChart.draw(g2, rect, subinfo);
if (info != null) {
info.getOwner().getEntityCollection().addAll(
subinfo.getEntityCollection());
info.addSubplotInfo(subinfo.getPlotInfo());
}
++column;
if (column == displayCols) {
column = 0;
++row; if (row == displayRows - 1 && diff != 0) {
xoffset = (diff * width) / 2;
}
}
} }