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RChart FAQ
  1. I can only plot a maximum of 7 points and 3 data series.
  2. How to create a gif file with jdk 1.1
  3. The axis is displayed as a thick line and it is very slow.
  4. Axis Labels are not properly displayed during scroll
  5. How do I create a chart reading from a file?
  6. Can I use RChart with Swing?
  7. How to embed the servlet in a HTML page.
  8. How do I use the Applet with ASP
  9. How do I use the Applet with Php
  10. How do I use the Applet with JSP
  11. How do I use the Servlet with JSP
  12. How do I use the Bean with JSP
  13. Servlet running on Linux does not show text
1. I can only plot a maximum of 7 points and 3 data series.

This is a restriction in the evaluation version of RChart. The registered version can plot up to 5000 point and a unlimited number of series.

 
2. How to create a gif file with jdk 1.1

This is an example:

public boolean saveToGIF(Chart c,String psFile) {
try {
//create image java.awt.Image
image=c.createImage(c.getSize().width,c.getSize().height);
c.paint(image.getGraphics );
// open file
java.io.File f=new java.io.File(psFile);
f.delete();
java.io.FileOutputStream of=new java.io.FileOutputStream(f);
// encode buffered image to a gif
GifEncoder encoder = new GifEncoder(image,of);
encoder.encode();
of.close(); }
catch (Exception e) { System.out.println(e.getMessage()); return false;}
return true; }

 
3. The axis is displayed as a thick line and it is very slow.

The problem could be the TICK_INTERVALX parameter. The default is 1. This means that will try to draw 1 tick per unit. If your xscale_max is 10000 then it will try to draw 10000 ticks and will result in a ugly line which is very slow to be displayed. In this case you could set the TICK_INTERVALX to 1000.

 
4. Axis Labels are not properly displayed during scroll

RChart needs to have a background color or image. For example: chart.back=new FillStyle(java.awt.Color.white);

 
5. How do I create a chart reading from a file?.

This is an example of reading a chart from a file:

<APPLET CODEBASE = "./"
CODE = "com.java4less.rchart.ChartApplet.class"
NAME = "TestApplet" WIDTH = 500 HEIGHT = 500 HSPACE = 0 VSPACE = 0 ALIGN = middle>
<PARAM NAME = "DATAFILE" VALUE = "data.html">
</APPLET>

the file data.html should contain:

TITLECHART=Sales 1999
LEGEND=TRUE
XLABEL=Month
YLABEL=Million $
XAXIS_LABELS=June|July|Aug.|Sept.|Oct.|Nov.|Dec.
SERIE_1=Products
SERIE_2=Services
SERIE_STYLE_1=0.2|RED|LINE
SERIE_FONT_1=Arial|PLAIN|8
SERIE_FONT_2=Arial|PLAIN|8
SERIE_COLOR_1=RED
SERIE_COLOR_2=BLUE
SERIE_POINT_COLOR_1=RED
SERIE_POINT_COLOR_2=BLUE
SERIE_POINT_1=true
SERIE_POINT_2=true
SERIE_STYLE_2=0.2|BLUE|LINE
SERIE_DATA_1=12|43|50|45|30|32|42
SERIE_DATA_2=20|41|48|39|36|34|50
SERIE_TYPE_1=LINE
SERIE_TYPE_2=LINE
CHART_BORDER=0.2|BLACK|LINE
CHART_FILL=LIGHTGRAY
BIG_TICK_INTERVALX=1
BIG_TICK_INTERVALY=10
YSCALE_MIN=0
LEGEND_BORDER=0.2|BLACK|LINE
LEGEND_FILL=WHITE
XAXIS_GRID=0.2|WHITE|DASHED
YAXIS_GRID=0.2|WHITE|DASHED
XAXIS_TICKATBASE=true
BACK_IMAGE=back16.gif

NOTE: you can put only variable paramters in the file (e.g. SERIE_DATA_1 and SERIE_DATA2). The rest of the parameters can be put in the applet parameters.

6. Can I use RChart with Swing?

Yes, RChart is 100% java.awt so you can use it with swing also. RChart is a subclass of java.awt.canvas.

It is however possible that you experience problems if you mix Light weight and heavy weight Java components (java.awt and swing). In that case you can modify the Chart.java source code to inherit from JPanel instead of java.awt.Canvas.
7. How to embed the servlet in a HTML page.

The result of the Servlet is an Image so you must use the <img> tag.This is how to embed the result of the charting servlet into an HTML page:

<img src="http://localhost:8080/examples/servlet/RChartServlet?DATAFILE=http://localhost:8080/examples/ChartData1.htm">.

8. How do I use the Applet with ASP

The following example will create an area chart (it is very similar to the example Chart2.htm).

It will retrieve the data from an MSAccess database that contains a table called "salesMonth". This table has three fields: "Products" (integer), "Services" (integer) and "salesMonth" (date), which contains the sales for several months.

The example will display the sales of the last 6 months. It will create a HTML page that contains the applet. Most of the parameters of the applet are constant, however the date labels and the sales data is retrieved from the DB.

<%@ LANGUAGE="VBSCRIPT" %>
<%' variables used to store the data used as parameter for the applet
dim labels, values1,values2
%>

<HTML>
<HEAD> </HEAD>
<BODY>
<APPLET
CODEBASE = "."
CODE = "com.java4less.rchart.ChartApplet.class"
NAME = "TestApplet"
WIDTH = 500 HEIGHT = 500
>

<!-- **** VARIABLE DATA, use VBScript to retrieve series data values from database **** -->
<% ' get data from last 6 months
set Connect=Server.CreateObject("ADODB.Connection")

' open db using a System ODBC data source called "Data"
Connect.ConnectionString="DSN=data;"
Connect.Open

' get sales data, execute SQL
set rs=Connect.Execute("Select * from SalesMonth Order by salesMonth DESC")

i=1
values1=""
values2=""
labels=""

' loop, plot only last 6 months
while (not rs.eof) and (i<=6)
if (i>1) then
' add separators to create list of values
values1= "|" & values1
values2= "|" & values2
labels= "|" & labels
end if

' get month name
labels= "" & MonthName(DatePart("m",rs("salesMonth")),1) & labels
' get sales of products
values1= "" & rs("Product") & values1
' get sales of services
values2= "" & rs("Services") & values2

i=i+1
rs.movenext
wend

rs.close
Connect.close
set Connect=nothing
%>

<!-- **** output of calculated variables**** -->
<PARAM NAME = "XAXIS_LABELS" VALUE = "<%=labels%>">
<PARAM NAME = "SERIE_DATA_2" VALUE = "<%=values1%>">
<PARAM NAME = "SERIE_DATA_1" VALUE = "<%=values2%>">


<!-- **** CONSTANT DATA **** -->
<PARAM NAME = "TITLECHART" VALUE = "Sales 1999">
<PARAM NAME = "LEGEND" VALUE = "TRUE">
<PARAM NAME = "XLABEL" VALUE = "Month">
<PARAM NAME = "YLABEL" VALUE = "Million $">
<PARAM NAME = "SERIE_1" VALUE = "Products">
<PARAM NAME = "SERIE_2" VALUE = "Services">
<PARAM NAME = "SERIE_STYLE_1" VALUE = "0.2|0x663300|LINE">
<PARAM NAME = "SERIE_STYLE_2" VALUE = "0.2|0x99|LINE">
<PARAM NAME = "SERIE_FILL_1" VALUE = "RED">
<PARAM NAME = "SERIE_FILL_2" VALUE = "0x99cc">
<PARAM NAME = "SERIE_FONT_1" VALUE = "Arial|PLAIN|8">
<PARAM NAME = "SERIE_FONT_2" VALUE = "Arial|PLAIN|8">
<PARAM NAME = "SERIE_POINT_1" VALUE = "true">
<PARAM NAME = "SERIE_POINT_2" VALUE = "true">
<PARAM NAME = "SERIE_TYPE_1" VALUE = "LINE">
<PARAM NAME = "SERIE_TYPE_2" VALUE = "LINE">
<PARAM NAME = "CHART_BORDER" VALUE = "0.2|BLACK|LINE">
<PARAM NAME = "CHART_FILL" VALUE = "LIGHTGRAY">
<PARAM NAME = "BIG_TICK_INTERVALX" VALUE = "1">
<PARAM NAME = "BIG_TICK_INTERVALY" VALUE = "1">
<PARAM NAME = "YSCALE_MIN" VALUE = "0">
<PARAM NAME = "TICK_INTERVALY" VALUE = "100">
<PARAM NAME = "LEGEND_BORDER" VALUE = "0.2|BLACK|LINE">
<PARAM NAME = "LEGEND_FILL" VALUE = "WHITE">
<PARAM NAME = "XAXIS_TICKATBASE" VALUE = "true">
<PARAM NAME = "XAXIS_TICKATBASE" VALUE = "true">
<PARAM NAME = "BACK_IMAGE" VALUE = "back13.gif">
</APPLET>
</BODY>
</HTML>
9. How do I use the Applet with Php

The following example will create an area chart (it is very similar to the example Chart2.htm).

It will retrieve the data from an MSAccess database that contains a table called "salesMonth". This table has three fields: "Products" (integer), "Services" (integer) and "salesMonth" (date), which contains the sales for several months.

The example will display the sales of the last 6 months. It will create a HTML page that contains the applet. Most of the parameters of the applet are constant, however the date labels and the sales data is retrieved from the DB.

<HTML>
<HEAD></HEAD>
<BODY>
<APPLET
CODEBASE = "."
CODE = "com.java4less.rchart.ChartApplet.class"
NAME = "TestApplet"
WIDTH = 500 HEIGHT = 500 ALIGN = middle
>

<!-- **** VARIABLE DATA, use Php to retrieve series data values from database ****
-->

<?
$labels="";
$values2="";
$values1="";
$i=1;

/* connect to database
open db using a System ODBC data source called "Data" */
$odbcid = odbc_connect ("data", "", "", "");
/* get sales data, execute SQL*/
$resultid = odbc_exec ($odbcid, "Select * from SalesMonth Order by salesMonth DESC") ;


/* iterate on sales data, up to 6 rows */
while (($i <= 6) and (odbc_fetch_row($resultid))) {
/* concatenate | separator */
if ($i>1) {
$values1= "|" . $values1;
$values2= "|" . $values2;
$labels= "|" . $labels;
}

/* concatenate value */
$values1= odbc_result ($resultid, "Services") . $values1;
$values2= odbc_result ($resultid, "Product") . $values2;
$labels= odbc_result ($resultid, "salesMonth") . $labels;

$i=$i+1;
/* next record */
odbc_fetch_row($resultid);
}


/* echo values for serie 1 */
echo "<PARAM NAME = \"SERIE_DATA_1\" VALUE = \"";
echo $values1;
echo "\">";

/* echo values for serie 2 */
echo "<PARAM NAME = \"SERIE_DATA_2\" VALUE = \"";
echo $values2;
echo "\">";

/* echo values for labels */
echo "<PARAM NAME = \"XAXIS_LABELS\" VALUE = \"";
echo $labels;
echo "\">";

/* close result */
odbc_free_result($resultid);
/* close connection */
odbc_close($odbcid);

?>


<!-- **** CONSTANT DATA **** -->
<PARAM NAME = "TITLECHART" VALUE = "Sales 1999">
<PARAM NAME = "LEGEND" VALUE = "TRUE">
<PARAM NAME = "XLABEL" VALUE = "Month">
<PARAM NAME = "YLABEL" VALUE = "Million $">
<PARAM NAME = "SERIE_1" VALUE = "Services">
<PARAM NAME = "SERIE_2" VALUE = "Products">
<PARAM NAME = "SERIE_STYLE_1" VALUE = "0.2|0x663300|LINE">
<PARAM NAME = "SERIE_STYLE_2" VALUE = "0.2|0x99|LINE">
<PARAM NAME = "SERIE_FILL_1" VALUE = "RED">
<PARAM NAME = "SERIE_FILL_2" VALUE = "0x99cc">
<PARAM NAME = "SERIE_FONT_1" VALUE = "Arial|PLAIN|8">
<PARAM NAME = "SERIE_FONT_2" VALUE = "Arial|PLAIN|8">
<PARAM NAME = "SERIE_POINT_1" VALUE = "true">
<PARAM NAME = "SERIE_POINT_2" VALUE = "true">
<PARAM NAME = "SERIE_TYPE_1" VALUE = "LINE">
<PARAM NAME = "SERIE_TYPE_2" VALUE = "LINE">
<PARAM NAME = "CHART_BORDER" VALUE = "0.2|BLACK|LINE">
<PARAM NAME = "CHART_FILL" VALUE = "LIGHTGRAY">
<PARAM NAME = "BIG_TICK_INTERVALX" VALUE = "1">
<PARAM NAME = "BIG_TICK_INTERVALY" VALUE = "1">
<PARAM NAME = "YSCALE_MIN" VALUE = "0">
<PARAM NAME = "TICK_INTERVALY" VALUE = "100">
<PARAM NAME = "LEGEND_BORDER" VALUE = "0.2|BLACK|LINE">
<PARAM NAME = "LEGEND_FILL" VALUE = "WHITE">
<PARAM NAME = "XAXIS_TICKATBASE" VALUE = "true">
<PARAM NAME = "XAXIS_TICKATBASE" VALUE = "true">
<PARAM NAME = "BACK_IMAGE" VALUE = "back13.gif">
</APPLET>
</BODY>
</HTML>
10. How do I use the Applet with JSP

The following example will create an area chart (it is very similar to the example Chart2.htm).

It will retrieve the data from an MSAccess database that contains a table called "salesMonth". This table has three fields: "Products" (integer), "Services" (integer) and "salesMonth" (date), which contains the sales for several months.

The example will display the sales of the last 6 months. It will create a HTML page that contains the applet. Most of the parameters of the applet are constant, however the date labels and the sales data is retrieved from the DB.

<HTML>
<HEAD></HEAD>
<BODY>
<APPLET
CODEBASE = "."
CODE = "com.java4less.rchart.ChartApplet.class"
NAME = "TestApplet"
ARCHIVE = "rchartClasses.zip"
WIDTH = 500 HEIGHT = 500>

<!-- **** VARIABLE DATA, use Java to retrieve series data values from database **** -->
<%
java.sql.Statement st;
java.sql.ResultSet rs;
java.sql.Connection db=null;
int i=1;
String labels="";
String values1="";
String values2="";

// connect to database
// open db using a System ODBC data source called "Data"
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
db = java.sql.DriverManager.getConnection("jdbc:odbc:data", "", "");
}
catch(Exception e) {
System.err.println("Error eonnecting to DB:" + e.getMessage()); }

try {
st = db.createStatement();
/*get sales data, execute SQL*/
rs = st.executeQuery("Select * from SalesMonth Order by salesMonth DESC");

/* iterate on sales data, up to 6 rows */
while ((i <= 6) && (rs.next())) {
/* concatenate | separator */
if (i>1) {
values1= "|" + values1;
values2= "|" + values2;
labels= "|" + labels;
}

/* concatenate value */
values1= "" + rs.getString("Services") + values1;
values2= "" + rs.getString( "Product") + values2;
java.text.SimpleDateFormat df= new java.text.SimpleDateFormat("MMM");
labels= "" + df.format(rs.getDate("salesMonth")) + labels;

i++;
}

rs.close();
db.close();
}

catch(Exception e) {
System.err.println("Error:" + e.getMessage());}

/* echo values for serie 1 */
out.println("<PARAM NAME = \"SERIE_DATA_1\" VALUE = \"" + values1 + "\">");

/* echo values for serie 2 */
out.println("<PARAM NAME = \"SERIE_DATA_2\" VALUE = \""+ values2 + "\">");

/* echo values for labels */
out.println("<PARAM NAME = \"XAXIS_LABELS\" VALUE = \""+ labels + "\">");
%>


<!-- **** CONSTANT DATA **** -->
<PARAM NAME = "TITLECHART" VALUE = "Sales 1999">
<PARAM NAME = "LEGEND" VALUE = "TRUE">
<PARAM NAME = "XLABEL" VALUE = "Month">
<PARAM NAME = "YLABEL" VALUE = "Million $">
<PARAM NAME = "SERIE_1" VALUE = "Services">
<PARAM NAME = "SERIE_2" VALUE = "Products">
<PARAM NAME = "SERIE_STYLE_1" VALUE = "0.2|0x663300|LINE">
<PARAM NAME = "SERIE_STYLE_2" VALUE = "0.2|0x99|LINE">
<PARAM NAME = "SERIE_FILL_1" VALUE = "RED">
<PARAM NAME = "SERIE_FILL_2" VALUE = "0x99cc">
<PARAM NAME = "SERIE_FONT_1" VALUE = "Arial|PLAIN|8">
<PARAM NAME = "SERIE_FONT_2" VALUE = "Arial|PLAIN|8">
<PARAM NAME = "SERIE_POINT_1" VALUE = "true">
<PARAM NAME = "SERIE_POINT_2" VALUE = "true">
<PARAM NAME = "SERIE_TYPE_1" VALUE = "LINE">
<PARAM NAME = "SERIE_TYPE_2" VALUE = "LINE">
<PARAM NAME = "CHART_BORDER" VALUE = "0.2|BLACK|LINE">
<PARAM NAME = "CHART_FILL" VALUE = "LIGHTGRAY">
<PARAM NAME = "BIG_TICK_INTERVALX" VALUE = "1">
<PARAM NAME = "BIG_TICK_INTERVALY" VALUE = "1">
<PARAM NAME = "YSCALE_MIN" VALUE = "0">
<PARAM NAME = "TICK_INTERVALY" VALUE = "100">
<PARAM NAME = "LEGEND_BORDER" VALUE = "0.2|BLACK|LINE">
<PARAM NAME = "LEGEND_FILL" VALUE = "WHITE">
<PARAM NAME = "XAXIS_TICKATBASE" VALUE = "true">
<PARAM NAME = "XAXIS_TICKATBASE" VALUE = "true">
<PARAM NAME = "BACK_IMAGE" VALUE = "back13.gif">
</APPLET>
</BODY>
</HTML>
11. How do I use the Servlet with JSP

The following example will create an area chart (it is very similar to the example Chart2.htm).

It will retrieve the data from an MSAccess database that contains a table called "salesMonth". This table has three fields: "Products" (integer), "Services" (integer) and "salesMonth" (date), which contains the sales for several months.

The example will display the sales of the last 6 months. It will create a HTML page that contains a reference to the Servlet. The JSP will first create a data file for the servlet. Most of the parameters in this data file are constant, however the date labels and the sales data is retrieved from the DB.

<HTML>
<HEAD>
<%
/* this is the file where we write the donfiguration for the servlet, we should use another file name, not constant */
String filename="dataFile.html";
%>
</HEAD>
<BODY>
<BR>
This is the output of the servlet. The data for the servlet has been calculated in a JSP file.
<BR>
<!-- **** VARIABLE DATA, use Java to retrieve series data values from database **** -->
<%

java.sql.Statement st;
java.sql.ResultSet rs;
java.sql.Connection db=null;
int i=1;
String labels="";
String values1="";
String values2="";

// connect to database
// open db using a System ODBC data source called "Data"
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
db = java.sql.DriverManager.getConnection("jdbc:odbc:data", "", "");
}
catch(Exception e) {
System.err.println("Error eonnecting to DB:" + e.getMessage()); }

try {
st = db.createStatement();
/*get sales data, execute SQL*/
rs = st.executeQuery("Select * from SalesMonth Order by salesMonth DESC");


/* iterate on sales data, up to 6 rows */
while ((i <= 6) && (rs.next())) {
/* concatenate | separator */
if (i>1) {
values1= "|" + values1;
values2= "|" + values2;
labels= "|" + labels;
}

/* concatenate value */
values1= "" + rs.getString("Services") + values1;
values2= "" + rs.getString( "Product") + values2;
java.text.SimpleDateFormat df= new java.text.SimpleDateFormat("MMM");
labels= "" + df.format(rs.getDate("salesMonth")) + labels;

i++;
}

rs.close();
db.close();
}
catch(Exception e) {
System.err.println("Error:" + e.getMessage());}

try {
/* open output data file */
java.io.File fi=new java.io.File("..\\webapps\\rchart\\data\\" + filename);
java.io.FileWriter fw=new java.io.FileWriter(fi);

/* write values for serie 1 */
fw.write("SERIE_DATA_1=" +values1 + "\n");

/* write values for serie 2 */
fw.write("SERIE_DATA_2=" +values2+ "\n");

/* write values for labels */
fw.write("XAXIS_LABELS=" +labels+ "\n");


/* write constant data to configuration file*/
fw.write("TITLECHART=Sales 1999\n");
fw.write("LEGEND=TRUE\n");
fw.write("XLABEL=Month\n");
fw.write("YLABEL=Million $\n");
fw.write("SERIE_1=Services\n");
fw.write("SERIE_2=Products\n");
fw.write("SERIE_STYLE_1=0.2|0x663300|LINE\n");
fw.write("SERIE_STYLE_2=0.2|0x99|LINE\n");
fw.write("SERIE_FILL_1=RED\n");
fw.write("SERIE_FILL_2=0x99cc\n");
fw.write("SERIE_FONT_1=Arial|PLAIN|8\n");
fw.write("SERIE_FONT_2=Arial|PLAIN|8\n");
fw.write("SERIE_POINT_1=true\n");
fw.write("SERIE_POINT_2=true\n");
fw.write("SERIE_TYPE_1=LINE\n");
fw.write("SERIE_TYPE_2=LINE\n");
fw.write("CHART_BORDER=0.2|BLACK|LINE\n");
fw.write("CHART_FILL=LIGHTGRAY\n");
fw.write("BIG_TICK_INTERVALX=1\n");
fw.write("BIG_TICK_INTERVALY=1\n");
fw.write("YSCALE_MIN=0\n");
fw.write("TICK_INTERVALY=100\n");
fw.write("LEGEND_BORDER=0.2|BLACK|LINE\n");
fw.write("LEGEND_FILL=WHITE\n");
fw.write("XAXIS_TICKATBASE=true\n");
fw.write("XAXIS_TICKATBASE=true\n");
fw.write("BACK_IMAGE=back13.gif\n");

fw.close();
}
catch(Exception e) {
System.err.println("Error writing data file:" + e.getMessage()); }

%>
<!-- **** LINK to the servlet that will use the data file we just created **** -->
<img src="http://localhost:8080/rchart/servlet/RChartServlet?DATAFILE=http://localhost:8080/rchart/data/<%=filename%>">

</BODY>
</HTML>
12. How do I use the Bean with JSP

The following example will create an area chart (it is very similar to the example Chart2.htm).

It will retrieve the data from an MSAccess database that contains a table called "salesMonth". This table has three fields: "Products" (integer), "Services" (integer) and "salesMonth" (date), which contains the sales for several months.

The example will display the sales of the last 6 months. It will create a HTML page that contains a reference to the a jpg file that has been created by the Bean. Most of the parameters are constant, however the date labels and the sales data is retrieved from the DB.

 

<HTML>
<HEAD>
 </HEAD>
<BODY>
<BR>
This is the output of the BEAN.
<BR>
<BR> <!-- **** VARIABLE DATA, use Java to retrieve series data values from database ****
-->

<jsp:useBean id="cha" scope="session" class="com.java4less.rchart.JChartBean" />
<%java.sql.Statement st;
java.sql.ResultSet rs;
java.sql.Connection db=null;
int i=1;
String labels="";
String values1="";
String values2="";// connect to database
// open db using a System ODBC entry called "Data"
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
db = java.sql.DriverManager.getConnection("jdbc:odbc:data", "", "");
}
catch(Exception e) {
System.err.println("Error eonnecting to DB:" + e.getMessage());
}try {st = db.createStatement();
rs = st.executeQuery("Select * from SalesMonth Order by salesMonth DESC");

/* iterate on sales data, up to 6 rows */
while ((i <= 6) && (rs.next())) {
/* concatenate | separator */
if (i>1) {
values1= "|" + values1;
values2= "|" + values2;
labels= "|" + labels;
}

/* concatenate value */
values1= "" + rs.getString("Services") + values1;
values2= "" + rs.getString( "Product") + values2;
java.text.SimpleDateFormat df= new java.text.SimpleDateFormat("MMM");
labels= "" + df.format(rs.getDate("salesMonth")) + labels; i++; }rs.close();
db.close();}

catch(Exception e) {
System.err.println("Error:" + e.getMessage());
}
try {

/* set parameters *//* write values for serie 1 */
cha.setParameter("SERIE_DATA_1",""+values1);/* write values for serie 2 */
cha.setParameter("SERIE_DATA_2",""+values2);/* write values for labels */
cha.setParameter("XAXIS_LABELS",""+labels);


/* write constant data to configuration file*/
cha.setParameter("TITLECHART","Sales 1999");
cha.setParameter("LEGEND","TRUE");
cha.setParameter("XLABEL","Month");
cha.setParameter("YLABEL","Million $");
cha.setParameter("SERIE_1","Services");
cha.setParameter("SERIE_2","Products");
cha.setParameter("SERIE_STYLE_1","0.2|0x663300|LINE");
cha.setParameter("SERIE_STYLE_2","0.2|0x99|LINE");
cha.setParameter("SERIE_FILL_1","RED");
cha.setParameter("SERIE_FILL_2","0x99cc");
cha.setParameter("SERIE_FONT_1","Arial|PLAIN|8");
cha.setParameter("SERIE_FONT_2","Arial|PLAIN|8");
cha.setParameter("SERIE_POINT_1","true");
cha.setParameter("SERIE_POINT_2","true");
cha.setParameter("SERIE_TYPE_1","LINE");
cha.setParameter("SERIE_TYPE_2","LINE");
cha.setParameter("CHART_BORDER","0.2|BLACK|LINE");
cha.setParameter("CHART_FILL","LIGHTGRAY");
cha.setParameter("BIG_TICK_INTERVALX","1");
cha.setParameter("BIG_TICK_INTERVALY","1");
cha.setParameter("YSCALE_MIN","0");
cha.setParameter("TICK_INTERVALY","100");
cha.setParameter("LEGEND_BORDER","0.2|BLACK|LINE");
cha.setParameter("LEGEND_FILL","WHITE");
cha.setParameter("XAXIS_TICKATBASE","true");
cha.setParameter("XAXIS_TICKATBASE","true");
cha.setParameter("BACK_IMAGE","back13.gif");

}

catch(Exception e) {
System.err.println("Error: " + e.getMessage());
}
/* create jpg file */
cha.buildChart();
cha.setChartSize(300,300);
cha.saveToFile("..\\webapps\\rchart\\chart.jpg","JPEG");

%>
<!-- **** LINK to the jpg file we just created **** -->
<img src="chart.jpg">

</BODY>
 </HTML>
13. Servlet running on Linux does not show texts

RChart uses "Arial" as default font which does not exist in Linux. The solution is use another font. For example:

TITLE_FONT=Dialog|BOLD|12



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