如何更改 JFreeChart 的大小 [英] How do I change a JFreeChart's size

问题描述

我已将 JFreeChart 添加到 JPanel(使用 BorderLayout)，它巨大.有什么办法可以让它变小吗?

I've added a JFreeChart to a JPanel (using a BorderLayout), and it's huge. Is there something I can do to make it smaller?

public void generateChart()
{
    DefaultCategoryDataset dataset = new DefaultCategoryDataset();

    //set the values of the chart
    for(int i=0; i<8; i++)
    {
        dataset.setValue(income_array[i], "Income",
            Double.toString(percent_array[i]));
    }

    JFreeChart chart = ChartFactory.createBarChart(
        "Required Annual Income for a Variety of Interest Rates",
        "Percent", "Income", dataset, PlotOrientation.VERTICAL,
        false,true, false);
    ChartPanel cp = new ChartPanel(chart);

    chart.setBackgroundPaint(Color.white);
    chart.getTitle().setPaint(Color.black); 
    CategoryPlot p = chart.getCategoryPlot(); 
    p.setRangeGridlinePaint(Color.blue); 

    //cp.setMaximumDrawHeight(5);
    //cp.setMaximumDrawWidth(5);
    //cp.setZoomOutFactor(.1);
    JPanel graph = new JPanel();
    graph.add(cp);
    middle.add(graph, BorderLayout.CENTER);
}   

推荐答案

当您创建 ChartPanel，你有几个影响结果的选项:

When you create your ChartPanel, you have several options that affect the result:

1. 接受 DEFAULT_WIDTH 和 DEFAULT_HEIGHT:680 x 420.

1. Accept the DEFAULT_WIDTH and DEFAULT_HEIGHT: 680 x 420.

在构造函数中指定首选的width和height.

Specify the preferred width and height in the constructor.

如果适当，则显式调用setPreferredSize().

覆盖 getPreferredSize() 以动态计算大小.

Override getPreferredSize() to calculate the size dynamically.

@Override
public Dimension getPreferredSize() {
    // given some values of w & h
    return new Dimension(w, h);
}

选择容器的布局将添加 ChartPanel.注意JPanel的默认布局是FlowLayout，而JFrame的默认布局是BorderLayout.作为一个具体的例子，ThermometerDemo 使用构造函数中的首选值和 GridLayout 允许动态调整大小的容器.

Choose the layout of the container to which the ChartPanel will be added. Note that the default layout of JPanel is FlowLayout, while that of JFrame is BorderLayout. As a concrete example, ThermometerDemo uses both preferred values in the constructor and a GridLayout for the container to allow dynamic resizing.

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