JFreechart 笔记一

来源：互联网发布：c语言判断质数编辑：程序博客网时间：2024/06/15 18:19

//1.折线图的Y轴如何自定义步长

JFreeChart chart = ChartFactory.createLineChart(

"材料价格曲线图", //折线图名称

"期间", // 横坐标名称

"平均价格", // 纵坐标名称

dataSet, // 数据

PlotOrientation.VERTICAL, // 水平显示图像

true, // include legend

true, // tooltips

false // urls );

chart.setBackgroundPaint(new Color(231, 237, 242));

CategoryPlot categoryPlot = chart.getCategoryPlot();

**NumberAxis numAxis = (NumberAxis) categoryPlot.getRangeAxis();

numAxis.setTickUnit(new NumberTickUnit(1000));//设置Y轴间隔**

// X轴如何自定义步长

NumberAxis domainAxis = (NumberAxis) categoryplot.getDomainAxis();

domainAxis.setTickLabelFont(new Font("", Font.PLAIN, 12));

domainAxis.setTickMarksVisible(true);// 標尺

domainAxis.setUpperMargin(0.001);

domainAxis.setLowerMargin(0);

double unitT;

if (dataXzE - dataXzS == 10) {

unitT = 1d;

} else if (

dataXzE == 0) { unitT = 10d;

} else {

unitT = (dataXzE - dataXzS) / 6d;

}

NumberTickUnit ntuT = new NumberTickUnit(unitT);

domainAxis.setTickUnit(ntuT);

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