如何将轴放在java中的.png文件中？ [英] How can I put axis on a .png file in java?

问题描述

我有chart.png，其中包含数据，我想在上面放一个简单的X-Y轴。我也想尝试不使用任何没有附带java的外部软件。我可以使用 jfreechart ，但是如果有办法可以它看起来不错，而只是使用一些计划java代码，那会更好。有没有人对如何做这类事情有好主意？

I have chart.png with data in it that I would like to put a simple X - Y axis on with some labeling. I also would like to try not to use any external software that doesn't come with java. I'm allowed to use jfreechart but if there is a way to make it look nice, while just using some plan java code, that would be better. Does anyone have a good idea about how to do this sort of thing?

更新：这样的东西，但数据将使用rgb值进行颜色编码，当然会有没有轴/标签。

Update: Something like this but the data would be color coded with rgb values and of course there would be no axis / labeling.

pyplot延迟示例http：/ /www.goldb.org/goldblog/cmg_images/pylot_latency_sample.png

此图只是一个示例，它看起来与我的实际图形看起来完全不同。 ..我的真实图形中可以包含每个rgb颜色值。我知道如何创建绘图，我只是不知道如何将轴/标签放在我创建的 BufferImage 上

This graph is just an example it looks nothing like what my actual graphs look like... My real graphs can have every rgb color value in them. I know how to create the plot, I just don't know how to put axis / labeling on the BufferImage that I've created

推荐答案

我认为修改静态图像不会很好，因为它不可避免地会导致注册错误和不匹配的样式。相反，将任何渲染集成到图表的创建中。使用此处概述的方法， sscce 说明了根据需要自定义渲染形状，颜色和轴的一些方法。

I don't think modifying a static image will work very well, as it will inevitably lead to registration errors and mismatched styles. Instead, integrate any rendering into the chart's creation. Using the approach outlined here, the sscce below illustrates a few of the ways to customize the rendered shapes, colors and axes as desired.

附录：要为单个项目着色，API会建议此处显示的方法，其中自定义渲染器会覆盖 getItemPaint（） 。 Color.getHSBColor（）用于创建全方位的颜色。

Addendum: To color individual items, the API recommends the approach shown here, in which a custom renderer overrides getItemPaint(). Color.getHSBColor() is used to create a full spectrum of colors.

以下是用于比较的原始默认渲染器：

Here is the original, default renderer for comparison:

import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.geom.Ellipse2D;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import javax.swing.JFrame;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;

/** @see https://stackoverflow.com/q/9843451/230513 */
public class ResponseTime {

    private static final int N = 600;
    private static final String title = "ResponseTime";
    private static final Random random = new Random();
    private static final Shape circle = new Ellipse2D.Double(-3, -3, 6, 6);
    private static final Color line = Color.gray;

    private ChartPanel createPanel() {
        JFreeChart chart = ChartFactory.createXYLineChart(
            title, "Elapsed Time (secs)", "Response Time (secs)",
            createDataset(), PlotOrientation.VERTICAL, true, true, false);
        XYPlot plot = chart.getXYPlot();
        MyRenderer renderer = new MyRenderer(true, true, N);
        plot.setRenderer(renderer);
        renderer.setSeriesShape(0, circle);
        renderer.setSeriesPaint(0, line);
        renderer.setUseFillPaint(true);
        renderer.setSeriesShapesFilled(0, true);
        renderer.setSeriesShapesVisible(0, true);
        renderer.setUseOutlinePaint(true);
        renderer.setSeriesOutlinePaint(0, line);
        ValueAxis range = plot.getRangeAxis();
        range.setLowerBound(0.5);
        return new ChartPanel(chart);
    }

    private static class MyRenderer extends XYLineAndShapeRenderer {

        private List<Color> clut;

        public MyRenderer(boolean lines, boolean shapes, int n) {
            super(lines, shapes);
            clut = new ArrayList<Color>(n);
            for (int i = 0; i < n; i++) {
                clut.add(Color.getHSBColor((float) i / n, 1, 1));
            }
        }

        @Override
        public Paint getItemFillPaint(int row, int column) {
            return clut.get(column);
        }
    }

    private XYDataset createDataset() {
        XYSeriesCollection result = new XYSeriesCollection();
        XYSeries series = new XYSeries("Series 1");
        for (double x = 0; x < N - 1; x++) {
            series.add(x, f(x));
        }
        series.add(25, 1.75); // outlier
        result.addSeries(series);
        return result;
    }

    private double f(double x) {
        double y = 0.004 * x + .75;
        return y + random.nextGaussian() * y / 10;
    }

    private void display() {
        JFrame f = new JFrame(title);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(createPanel());
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                new ResponseTime().display();
            }
        });
    }
}

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