java曲线自动生成系统_java生成曲线图

生成曲线图可以使用Java中的图形库，比如JFreeChart或者Chart.js。这些库提供了许多API可以用来生成各种类型的图表，包括曲线图。

以下是一个使用JFreeChart生成曲线图的示例代码：

import java.awt.Color;
import java.awt.Dimension;
import java.awt.GradientPaint;
import java.awt.Point;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.swing.JFrame;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.time.Year;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.GradientPaintTransformType;
import org.jfree.ui.RectangleInsets;
import org.jfree.ui.RefineryUtilities;
import org.jfree.ui.StandardGradientPaintTransformer;

public class LineChartDemo extends ApplicationFrame {

    public LineChartDemo(String title) {
        super(title);
        JFreeChart chart = createChart();
        ChartPanel panel = new ChartPanel(chart);
        panel.setPreferredSize(new Dimension(500, 270));
        setContentPane(panel);
    }

    private JFreeChart createChart() {

        TimeSeries series = new TimeSeries("Random Data");
        Date date = new Date();
        for (int i = 0; i < 100; i++) {
            date = new Date(date.getTime() + 1000 * 60 * 60 * 24);
            series.add(new Year(date), Math.random() * 100);
        }

        TimeSeriesCollection dataset = new TimeSeriesCollection();
        dataset.addSeries(series);

        JFreeChart chart = ChartFactory.createXYLineChart(
            "Line Chart Demo",      // chart title
            "Time",                 // x axis label
            "Value",                // y axis label
            dataset,                // data
            PlotOrientation.VERTICAL,
            true,                   // include legend
            true,                   // tooltips
            false                   // urls
        );

        chart.setBackgroundPaint(Color.white);

        XYPlot plot = (XYPlot) chart.getPlot();
        plot.setBackgroundPaint(Color.lightGray);
        plot.setDomainGridlinePaint(Color.white);
        plot.setRangeGridlinePaint(Color.white);
        plot.setAxisOffset(new RectangleInsets(5.0, 5.0, 5.0, 5.0));
        plot.setDomainCrosshairVisible(true);
        plot.setRangeCrosshairVisible(true);

        XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer();
        renderer.setSeriesLinesVisible(0, true);
        renderer.setSeriesShapesVisible(0, false);
        plot.setRenderer(renderer);

        DateAxis axis = (DateAxis) plot.getDomainAxis();
        axis.setDateFormatOverride(new SimpleDateFormat("MMM-yyyy"));

        NumberAxis axis2 = (NumberAxis) plot.getRangeAxis();
        axis2.setNumberFormatOverride(new DecimalFormat("#0.0"));

        GradientPaint gp0 = new GradientPaint(
            0.0f, 0.0f, Color.blue,
            0.0f, 0.0f, new Color(0, 0, 64)
        );
        GradientPaint gp1 = new GradientPaint(
            0.0f, 0.0f, Color.green,
            0.0f, 0.0f, new Color(0, 64, 0)
        );
        renderer.setSeriesPaint(0, gp0);
        renderer.setSeriesPaint(1, gp1);
        renderer.setGradientPaintTransformer(
            new StandardGradientPaintTransformer(GradientPaintTransformType.VERTICAL)
        );

        return chart;

    }

    public static void main(String[] args) {
        LineChartDemo demo = new LineChartDemo("Line Chart Demo");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);
    }

}

这段代码使用JFreeChart库生成随机数据的曲线图。如果你有自己的数据，只需要修改相应的代码即可。