请问如何用java 画折线图？

change 先生请说得详细一点。高分奉送

http://inetsoftcorp.com/cgi-bin/v6/htmlgen.pl?home/index.html
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用 jsp + javabean 如何实现，有样例有重赏

用 jsp + javabean 如何实现，有样例有重赏最好这些折点是可动态变化的、可控制的

http://www.free868.com/~jspuser/article/java/java2d/javagraph_java2d.htm#two

这个问题我自己处理好了。呵呵 /*
  file : DrawLine.java
*/
import java.awt.*;import java.awt.geom.*;
import java.awt.font.*;
import java.util.*;
import java.lang.*;
import java.applet.Applet;public class DrawLine extends Applet{ TextField fromFld, toFld;
   String MyText;
   Label label, toLabel, fromLabel, statusLabel;
   PlotCanvas canvas;
   public int i;
   Button redb, blueb, domainChangeb;
   Color color;
Panel panel1, panel2, bottomPanel, statusPanel, xdomainPanel;
   Choice fnChoice;
   float beginXmin = 0, beginXmax = 100;
int MaxActByts;
int actbyts;
int[] ActByts;
int count=5;
    public void init() {
    MaxActByts = Integer.parseInt(getParameter("MaxActByts"));
    count = Integer.parseInt(getParameter("Row_count"));
    ActByts = new int[count];
    for ( int j=0;j<count;j++ ){
    ActByts[j] = Integer.parseInt(getParameter("ActByts"+j));
    }

    actbyts =Integer.parseInt(getParameter("ActByts0"));

    setLayout(new BorderLayout(5,5));

      panel1 = new Panel();
      label = new Label("Plotting a Function" + MaxActByts + "aa" + count);
      panel1.add(label);
      add("North", panel1);

      canvas = new PlotCanvas(this,ActByts,count,MaxActByts);
      add("Center", canvas);
      fromLabel = new Label("-100");



      /* Bottom Panel, with from and to and status DrawLine. */

      bottomPanel = new Panel();
      bottomPanel.setLayout(new GridLayout(0,1,5,5));

      /* Domain panel */
      xdomainPanel = new Panel();

      xdomainPanel.add(new Label("Plot x from : "));
      xdomainPanel.add(new Label("to : "));
      bottomPanel.add(xdomainPanel);

      /* Status DrawLine */
      statusPanel = new Panel();
      statusLabel = new Label("                                           ");
      statusLabel.setForeground(Color.magenta);
      statusPanel.add(statusLabel);

      bottomPanel.add(statusPanel);

      add("South", bottomPanel);
}

class PlotCanvas extends Canvas {
   DrawLine containedBy;
   public int mousex, mousey;
   public boolean isMouse = false;
   int timeThrough = 0;
   Color color = Color.green;
   int inset = 20;
   int fn = 0;
   float ymax, ymin, xmax, xmin;
int[] ActByts;
int count;
int MaxActByts;
   PlotCanvas(DrawLine containedByIn,int[] ActByts_,int count_,int MaxActByts_) {
super();
containedBy = containedByIn;
xmin = 0;
xmax = 100;
ActByts = ActByts_;
count = count_;
MaxActByts = MaxActByts_;
}   public void changeColor (Color inColor) {
     color = inColor;
   }
     public void setFn(int newFn) {
     fn = newFn;
   }   public void setXmin(float newXmin) {
     xmin = newXmin;
   }   public float getXmin() {
     return(xmin);
   }   public void setXmax(float newXmax) {
     xmax = newXmax;
   }   /** Draws a box around this panel, plus other stuff. */
   public void paint(Graphics g) {
     int x, y;
     Dimension d = size();
     /* These need to be made into floats. */
     float xcur, ycur;
     float xplot, yplot;
     PlotCoord pc;

     g.drawRect(0,0, d.width - 1, d.height - 1);

     g.setColor(color);
     /* This time through is just to find out what the max y value is. */
     ymax = 0;
     ymin = 0;
     ymax = MaxActByts;
     float stepSize = (xmax - xmin)/50;
     /*
     float stepSize = (xmax - xmin)/50;
     for (xcur = xmin; xcur <= xmax; xcur += stepSize) {
       // The function we are going to plot.
       ycur = func(xcur);

       if (ycur > ymax)
ymax = ycur;
       if (ycur < ymin)
ymin = ycur;
     }
     */
     pc = new PlotCoord (xmax, ymax, xmin, ymin, d.width, d.height, inset);

     int xcoord = 0, ycoord = 0;

     g.setColor(Color.black);

     float xaxisStart = xmax, xaxisEnd = xmin, xaxisPosy;
     float yaxisStart = ymax, yaxisEnd = ymin, yaxisPosx;;

     /* Axis rules:
        If 0 is on the map, print out the axis there.
        If 0 is not on the map, print out the axis on the
        minimum. */

     if (xmin < 0  && xmax > 0)
       yaxisPosx = 0;
     else
       yaxisPosx = xmin;

     if (ymin < 0  && ymax > 0)
       xaxisPosy = 0;
     else
       xaxisPosy = ymin ;

     /*    System.out.println("Yaxis at x = " + yaxisPosx +
        "  Xaxis at y = " + xaxisPosy);
        */

     Font f = new Font ("Dialog", Font.PLAIN, 10);
     g.setFont(f);

     /* Draw x axis. */
     g.drawLine(pc.xcoord(xaxisStart), pc.ycoord(xaxisPosy),
        pc.xcoord(xaxisEnd), pc.ycoord(xaxisPosy));
     /* Draw y axis. */
     g.drawLine(pc.xcoord(yaxisPosx), pc.ycoord(yaxisStart),
        pc.xcoord(yaxisPosx), pc.ycoord(yaxisEnd));

     /* This draws one tick  on y */
     ycoord = pc.ycoord(ymin + (ymax - ymin)/2);
     xcoord = pc.xcoord(yaxisPosx);

     g.drawLine(xcoord+3, ycoord , xcoord - 3, ycoord);
     g.drawString(
       new Integer(Math.round(ymin + (ymax - ymin)/2)).toString(),
xcoord + 5, ycoord + 10);

     /* This draws one tick  on x */
     xcoord = pc.xcoord(xmin + (xmax - xmin)/2);
     ycoord = pc.ycoord(xaxisPosy);

     g.drawLine(xcoord, ycoord + 3, xcoord , ycoord - 3);
     g.drawString(
        new Integer(Math.round(xmin + (xmax - xmin)/2)).toString(),
xcoord -5, ycoord + 15);

     /* draw a tick at 0 if it is on the graph */
     if (xmin < 0  && xmax > 0) {
       xcoord = pc.xcoord(0);
       ycoord = pc.ycoord(xaxisPosy);
       g.drawLine(xcoord, ycoord + 3, xcoord , ycoord - 3);
       g.drawString("0", xcoord -5, ycoord + 15);
     }

     if (ymin < 0  && ymax > 0) {
       ycoord = pc.ycoord(0);
       xcoord = pc.xcoord(yaxisPosx);
       g.drawLine(xcoord+3, ycoord , xcoord - 3, ycoord);
       g.drawString("0", xcoord + 7, ycoord + 10);
     }

     /* Draw tick s at the max's. */

     /* This draws one tick  on y */
     ycoord = pc.ycoord(ymax);
     xcoord = pc.xcoord(yaxisPosx);

     g.drawLine(xcoord+3, ycoord , xcoord - 3, ycoord);
     g.drawString(
       new Integer(Math.round(ymax)).toString(),
xcoord + 5, ycoord + 10);

     /* This draws one tick  on x */
     xcoord = pc.xcoord(xmax);
     ycoord = pc.ycoord(xaxisPosy);

     g.drawLine(xcoord, ycoord + 3, xcoord , ycoord - 3);
g.drawString(
        new Integer(Math.round(xmax)).toString(),
xcoord - 5, ycoord + 15);

     /* end of tick s at the max's. */

     g.setColor(color);

     int xcoordPrev = 0, ycoordPrev = 0;
     float xprev = 0, yprev = 0;
     stepSize = (xmax - xmin)/10;
     int k=0;
     for (xcur = xmin; xcur <= xmax; xcur += stepSize) {

      //ycur = func(xcur);
      ycur=0;

      if (k < count ){
       ycur = ((float)ActByts[k]);
      }
      k++;

xcoord = pc.xcoord(xcur);
ycoord = pc.ycoord(ycur);

       /* ie, don't do the very first x */
       if (xcur != xmin) {

/*if (xcur > -0.01 && xcur < 0.01  )
System.out.println( xprev + ":" +
    xcoordPrev + "  " +
    yprev + ":" +
    ycoordPrev + "  " +
    xcur + ":" +
    xcoord + "  " +
    ycur + ":" +
    ycoord);*/

/*g.drawOval(xcoord-3, ycoord-3, 6, 6);*/

g.drawLine(xcoordPrev, ycoordPrev,
   xcoord, ycoord);

}
g.drawString(String.valueOf(ActByts[k]), xcoord, ycoord + 5);
       xcoordPrev = xcoord;
       ycoordPrev = ycoord;
       xprev = xcur;
       yprev = ycur;
}
}   float func( float x) {
     float retval;

     switch (fn) {
     case 0:
     retval = Math.abs(x) + 30;
       break;
     case 1:
       retval = x * x;
       break;
     case 2:
       retval = x * x * x;
       break;
     case 3:
       retval = x * x + x - 52;
       break;
     default:
       System.out.println("Bad function number");
       retval = -1;
     }
       return(retval);
   }
   /*  public boolean mouseDown(Event e, int x, int y) {
     Graphics gc;
     gc = getGraphics();

     isMouse = true;
     mousex = x;
     mousey = y;
     System.out.println("Got a mouse event at " + x + ", " + y);
     gc.setColor(color);
     System.out.println(color);
     System.out.println(gc.getColor());
     gc.drawLine(mousex, mousey, mousex + 50, mousey + 10);
     return true;
   }
   */

}
}<html><head>
<meta HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=gb2312">
<meta NAME="GENERATOR" CONTENT="Microsoft FrontPage 3.0">
<title>SimplePlot.java</title>
</head><body TEXT="#FFFFFF" BGCOLOR="#000000" LINK="#EEEE00" VLINK="#009999">
<h1 align="center">Report Char</h1><hr align="center">
<p align="center">
<applet code="line70.class" width="600" height="400">
<param name=MaxActByts value="6480">
<param name=Row_Count value="10"><param name=ActByts0 value="36">
<param name=ActByts1 value="12">
<param name=ActByts2 value="176">
<param name=ActByts3 value="159">
<param name=ActByts4 value="2472">
<param name=ActByts5 value="275">
<param name=ActByts6 value="31">
<param name=ActByts7 value="30">
<param name=ActByts8 value="5922">
<param name=ActByts9 value="6480">

</applet>
</p>
<hr align="center">
<b>

change 先生的建议不错。谢谢！不过 report tool 比较难需要一段时间研究。

这只是画折线，怎么画柱状图表呢？在jdk尚未支援 2D图形之前， Programmer只可以画出直的、相同粗细的线条。现在，我们就教您如何透过2D API绘出不同粗细的线条及圆滑的曲线。
在package java.awt.geom中提供了Line2D、 QuadCurve2D及 CubicCurve2D等 classes，让 Programmer轻松地绘出想要的线条。http://www.free868.com/~jspuser/article/java/java2d/javagraph_java2d.htm#two http://www2.net668.net/grun/rainman/java/FgChart/FgChart.html

"PlotCoord" where i find it???????????????

怎么找不到PlotCoord?编译不能通过！

画柱状图表可以使用FREECHART控件，完全FREE，可到GOOGLE.COM中查找FREECHART

调试易

请问如何用java 画折线图？

解决方案 »