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 ），它是巨大的。我可以做些什么来缩小它？

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

当你创建 ChartPanel ，您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.

指定首选 width 和构造函数中的 height 。

Specify the preferred width and height in the constructor.

调用<$如果适当，请明确c $ c> setPreferredSize（）。

Invoke setPreferredSize() explicitly if appropriate.

覆盖 getPreferredSize（）动态计算大小。

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

选择布局 ChartPanel 将成为的容器添加。请注意， JPanel 的默认布局是 FlowLayout ，而 JFrame的默认布局是 BorderLayout 。举一个具体的例子， ThermometerDemo 在构造函数中使用两个首选值容器的 GridLayout 允许动态调整大小。

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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