jfreechart

I wrote a simple parabola plot using JFreeChart. package parabolademo; import java.awt.geom.Point2D; import java.awt.geom.Rectangle2D; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartMouseEvent; import org.jfree.chart.ChartMouseListener; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.chart.plot.PlotOrientation; import org.jfree.chart.plot.XYPlot; import org.jfree.data.function.Function2D; import org.jfree.data.function.PolynomialFunction2D; import org.jfree.data.general.DatasetUtilities; import org.jfree.data.xy.XYDataset; import org

I have a JFrame that displays JPanels depending on the MenuItem you click. It works, but now I need to call a method once a JPanel is added to the frame and it is being shown (because I'm using JFreeChart inside that panel and I have to call chartPanel.repaint() when the JPanel is visible): this.getContentPane().add( myjpanel, BorderLayout.CENTER ); //this = JFrame this.validate(); myjpanel.methodCalledOnceDisplayed(); Does it seem ok? Is myjpanel being shown really? It seems it is not: public void methodCalledOnceDisplayed() { chartPanel.repaint() } This is not working ( chartPanel

I'm trying do define an interface in which I want to plot some values received by an external device. These values are received with a frequency that can be set through the interface. Of course the period of the plot should change according to the period defined by the user. So I started to define the followint Chart: int periodMs = 200; MilliDTSC dataset = new MilliDTSC(1,100, new MultipleOfMillisecond(periodMs)); dataset.setTimeBase(new MultipleOfMillisecond(periodMs)) dataset.addSeries(zeroSeries()),0,"Zero data") // zeroSeries returs a series with values set to 0 JFreeChart chart =

I want to show live data on a TimeSeries chart with real time shown on the x-axis (or at least have the speed of the time the same as real-time). Here is a SSCCE of the problem with random numbers as the live input. The time shown on the x-axis is much faster than real-time (assuming it is shown in hh:mm:ss format): public class DynamicTimeSeriesChart extends JPanel { private DynamicTimeSeriesCollection dataset; private JFreeChart chart = null; public DynamicTimeSeriesChart(final String title) { dataset = new DynamicTimeSeriesCollection(1, 2000, new Second()); dataset.setTimeBase(new Second(0,

I have array of elements and they belong to one Series,with these elements I calculated Centroids. Problem is when I display them with "ScatterPlot" I need to show "Array Elements" with "One Color" and the Centroid of these points in "Different Color". import java.awt.BorderLayout; import java.awt.Color; import java.awt.Dimension; import java.awt.Shape; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartPanel; import org.jfree

背景 最近的一个项目中，对数据的统计分析有很大的要求，这就要求有一款很强大的报表、图表插件。因此，组长给分了任务，让我们各自去研究不同的图表插件。用了一两天的时间，对java这块的图表插件做了一个简单的研究。java方向的图报表还是有很多很多的，例如，在业界颇具口碑的商业插件—— ChartDirector、 JavaScript图表 JScharts 等，以及开源插件—— JFreeChart（源码免费，文档付费）、 JasperReports 等。 现状 随着信息化时代的到来，计算机的应用也越来越广泛， 无论是企业还是政府机关，对数据的分析处理能力都是有严格要求的，以往的方式都是手工绘制图报表，来分析数据带来的影响和趋势。然而，图表的出现解放了人们的双手，利用计算机的高速处理能力，依托大数据量，绘制出各种各样的图表，以不同的方式展现出数据的趋势，使得阅读者对以往的数据和未来的趋势一目了然，运筹帷幄。 然而，就目前来说，在报表方面，国内只有稀疏的几家公司提供了很好的开发工具；但在图表方面，国内就欠缺很多了，大部分知名的图表插件都是国外的产品。而且，随着大数据时代的到来，对数据的处理、分析能力要求会更高，而图表、报表的需求也会越来越多。 介绍 在Web开发中，图形和图表是常用的数据呈现方式，图表能将枯燥的数据生动的表现出来。也许你正接手一个Web图表开发项目

在Web开发中，图形和图表是常用的数据呈现方式，图表能将枯燥的数据生动的表现出来。也许你正接手一个Web图表开发项目，却被Web图表开发工具选型的问题困扰着，要么是价格昂贵，要么就是部署麻烦，或者图表效果不尽人意。那这篇关于JFreeChart和ChartDirector这两个Web图表工具的使用评测能给你一些帮助和启示。 JFreeChart是Java平台下开源的的图表类库，是一个完全基于Java的图表开发技术。支持的图表类型也比较丰富，比如饼图、柱状图、散点图、仪表盘、甘特图等多种图表，还可以生成Web图形报表。JFreeChart可导出PNG和JPEG格式的文件，可以与PDF和EXCEL关联。 JFreeChart,Web图形报表,Java开源图表工具 JFreeChart使用评测 稳定、轻量级且功能强大 免费开源，但是开发手册和示例要花钱购买 API处理简单，很容易上手 生成的图表运行顺畅 虽然JFreeChart的文档要收费，但好在国内还有很多人在使用JFreeChart，网上可以找到很多相关的使用教程，可以参考一下。JFreeChart的缺陷就是只适合生成图片，而且文字、图片都不是特别清晰，还需要进行一些调整，比较麻烦。在交互性方面它又比不上Flash图表工具，比如Open Flash Chart、AnyChart、FusionCharts等。

I have the following code to method loop throug the sectors of a polar plot, but the method is being called several times, as if it was in a loop. I want to create a series on each sectors of the plot, the sector being defines by the axis tick unit and the angle tick unit. When I comment out the polarDataset.addSeries(new XYSeries("test")) and the for loop for this new series, the problem disappears, making me believe there might be something up with this. This is a continuation of a question posted earlier Can someone please explain to me why it keeps looping? And why the number of series