jfreechart api

This paper introduces the histogram as an example, of course, this is only a method; There are many ways to show charts, such as customizing chart labels, using Jfreechart plug-ins, and so on; 1, import JS file, including a lot of display methods: The code is as follows: 2, from the background to obtain data: 1 2 3 4 5 6 7 8 9 function init () {var name3= " 3. Assign the data to the legend: 1 2 3 4 5 6 7 8 9

, 0.0f,color.blue,0.0f,0.0f,newcolor ( 0,0,64)); NBSP;NBSP;NBSP;NBSP;GRADIENTPAINTNBSP;GRADIENTPAINT1NBSP;=NBSP;NEWNBSp Gradientpaint (0.0f,0.0f,color.green,0.0f,0.0f, newcolor (0,64,0)); gradientpaintgradientpaint2=newgradientpaint (0.0F, 0.0f,color.red,0.0f,0.0f,newcolor ( 64,0,0)); barrenderer.setseriespaint (0,gradientpaint); barrenderer.setseriespaint (1,NBSP;GRADIENTPAINT1); barrenderer.setseriespaint (2,gradientpaint2); barrenderer.setlegenditemtooltipgenerator (new Standardcate

Effect drawing source Code reference For some discrete points, the linear fitting effect diagram of the discrete point is performed using the least squares method. Source Code Import Java.awt.Color; Import Java.io.File; Import java.io.IOException; Import java.util.ArrayList; Import Org.jfree.chart.ChartFactory; Import Org.jfree.chart.ChartFrame; Import org.jfree.chart.ChartUtilities; Import Org.jfree.chart.JFreeChart; Import Org.jfree.chart.labels.StandardXYToolTipGenerator; Import Org.jfree.c

Recently used Jfreechart to complete the project's image export task, the Chinese garbled problem whole afternoon, only to finish Java code /** * Configuration Font * * @param chart * Jfreechart object/private static void Configfont (Jfreechart chart) {//config font xfont = new Font ("Arial, Font.plain,")//x axis font yfont = new Font ("Arial", Font.plain,)/y ax

Set in Web.xml: Copy Code code as follows: Methods in Java classes: Copy Code code as follows: public string Getchart (string series[],double score[][],string type[],string name) { final int num=8; Defaultcategorydataset defaultcategorydataset = new Defaultcategorydataset (); for (int i=0;iType[i]=type[i].substring (0, (Type[i].length () } for (int j=0;jint i=0;for (i=0;iDefaultcategorydataset.addvalue (Score[j][i], series[j], type[i]);}}

";} Display Bar Chart @RequEstmapping (value = "/getcolumnchart") public Modelandview Getcolumnchart (HttpServletRequest request, HttpServletResponse response, Modelmap modelmap) throws exception{//1. Get Data collection Categorydataset DataSet = GetData Set (); 2. Create a histogram Jfreechart chart = Chartfactory.createbarchart3d ("Student Satisfaction with teachers",//Chart title "Course Name",//Catalog Axis display label

4.1. Simple Line chart Use Categorydataset to provide data for the chart. DefaultCategoryDataset　dataset　=　new　DefaultCategoryDataset(); dataset.addValue(100,　"Jan",　"Spring　Security"); dataset.addValue(150,　"Jan",　"jBPM　4"); dataset.addValue(300,　"Jan",　"Ext　JS"); dataset.addValue(100,　"Jan",　"JFreeChart"); If we only draw a polyline, make sure that the second argument is consistent. Next, use Createlinechart to create the chart.

Garbled in the window environment may be the Jfreechart class library version is high. In Linux there are small blocks garbled solution.Reason: JRE lacks Chinese font1. Log in to the system as root, switch to the jdk_home/jre/lib/fonts directory to execute mkdir fallback create a newdirectory;2. Upload SIMSUN.TTC to fallback directory, execute CP SIMSUN.TTC SIMSUN.TTF copy;Click Simsun.ttc:http://files.cnblogs.com/jiabaode/simsun.zipor download the JA

First import package Jfreechart and Jcommon Second, configure the Out-of-the-box display class for Web.xml calls A detailed example of a column chart class

This paper introduces the histogram as an example, of course, this is only a method; There are many ways to show charts, such as customizing chart labels, using Jfreechart plug-ins, and so on; 1, import JS file, including a lot of display methods: Copy Code code as follows: 2, from the background to obtain data: function init () { var name3= " 3. Assign the data to the legend: function ShowChart4 (names

When we draw with Jfreechart, sometimes the scale on the data axis wants to define itself, such as the scale is 5, do not want to let Jfeechart automatic control, because its own control of the scale sometimes does not adapt to our needs. Numberaxis Numberaxis = (numberaxis) plot.getrangeaxis ();Numberaxis. Setautotickunitselection (FALSE); Double unit=10d;//the length of the scaleNumbertickunit ntu= New Numbertickunit (unit);Numberaxis. Settickunit (

The following bar chart example includes most of the bar chart class settings file name: index.jsp Org.jfree.chart.ChartFactory,Org.jfree.chart.JFreeChart,Org.jfree.chart.plot.PlotOrientation,Org.jfree.chart.servlet.ServletUtilities,Org.jfree.data.category.CategoryDataset,Org.jfree.data.general.*,Org.jfree.chart.plot.CategoryPlot,Org.jfree.chart.axis.CategoryAxis,Org.jfree.chart.axis.ValueAxis,Org.jfree.chart.renderer.category.BarRenderer3D,Org.jfree.chart.urls.StandardCategoryURLGenerator,Org

Last week, the chromium version library was developed with a focus on many forms-related changes and battery status APIs (Note: Battery status APIs are actually part of the system information API in device APIs) and performance improvement. All unsigned and floating-point array types (Note: itAllows JavaScript to support binary data, You can refer to this Article) now the developer tool will display as a normal array. Obtaining heap snapshots is now 1

1. Web API Brief DescriptionRecently, many large platforms have exposed web APIs. such as Baidu map Web API, do map related people are familiar. Exposing the service this way makes it easy to integrate functionality with a wide variety of device and client platforms, and to create a richer HTML experience by using JavaScript in the browser. So I believe that the Web API