RE: [jCharts-users] Problems in Barchart and Line Chart

[Vikram R. <VikramR@PLANETASIA.COM>]

Pal,
 
 
w.r.t. to the axis labels, there is a length allocated to each label and
jCharts calculates whether all labels can be fitted into the charts. If not,
the labels are displayed selectively - alternate labels may be displayed, or
every third label may be displayed, or every fourth ... depending on the
size of the label. The size of the label is a function of the font size,
font and the number of characters in the label string. 
 
There is a code submission in the developer's list which will help you get
around the label problem by truncating labels and appending a "..." to them.
It will also let you image map the label text so that when the user does a
mouse over on the label, the complete string will be displayed.
 
hope this helps,
Vikram

-----Original Message-----
From: Pal Perinbam [mailto:pal...@ya...]
Sent: Tuesday, August 26, 2003 7:07 PM
To: jch...@li...
Subject: [jCharts-users] Problems in Barchart and Line Chart



Hi,

As I told you earlier, I herewith send the code sample.

Please run this by setting font size in the code.


 We are using Jcharts to generate charts for our project. We have a problem
while printing the charts. The charts are fine on the 

screen but when we print that it looks blurred. We suspect it may be due to
the Jpeg encoding. We encode the chart object into jpeg image 

using the Jpegencoder13 provided with jcharts. Is there a way to create BMP
or any other high quality image from jcharts, or can we improve 

image quality by some other means.

 We also face another problem. When we increase the X Axis label font size
of a line chart or bar chart, most of the Xaxis labels 

disappear. I've attached a sample to simulate this. In the below Sample. the
chart is fine when the font size is 10, but when it is changed to 11 

the labels disappear.

Expecting your earliest reply.

import org.jCharts.properties.LegendProperties;
import org.jCharts.properties.ChartProperties;
import org.jCharts.properties.util.ChartStroke;
import org.jCharts.properties.util.ChartFont;
import org.jCharts.properties.BarChartProperties;
import org.jCharts.properties.AxisProperties;
import org.jCharts.properties.DataAxisProperties;
import org.jCharts.chartData.AxisChartDataSet;
import org.jCharts.chartData.interfaces.IAxisDataSeries;
import org.jCharts.chartData.DataSeries;
import org.jCharts.axisChart.AxisChart;
import org.jCharts.types.ChartType;
import org.jCharts.encoders.JPEGEncoder13;
import  java.awt.Color;
import  java.awt.Paint;
import  java.awt.Font;
import  java.awt.BasicStroke;
import  java.io.FileOutputStream;

class  createBarChart
{
 public static void main(String[] args) 
 {
  try {
   int fontSize=10;  //Font Size
   int width = 300;
   int height = 200;


   LegendProperties legendProperties=null;
   ChartProperties chartProperties = new ChartProperties();
   AxisProperties axisProperties = new AxisProperties( false );
   FileOutputStream objFOS = new FileOutputStream("mychart.jpg");

   ChartFont axisScaleFont = new ChartFont( new Font( "Arial",
Font.PLAIN,fontSize), Color.black );
   ChartStroke CSAxis = new ChartStroke(new BasicStroke(1.0f),Color.black);

   axisProperties.getXAxisProperties().setScaleChartFont(axisScaleFont);
   axisProperties.getXAxisProperties().setShowEndBorder(false);
   axisProperties.getXAxisProperties().setPaddingBetweenXAxisLabels(0f);
   axisProperties.getXAxisProperties().setAxisStroke(CSAxis);
 
axisProperties.getXAxisProperties().setShowGridLines(DataAxisProperties.GRID
_LINES_NONE);
   axisProperties.getYAxisProperties().setScaleChartFont(axisScaleFont);
   axisProperties.getYAxisProperties().setShowEndBorder(false);
   axisProperties.getYAxisProperties().setAxisStroke(CSAxis);
 
axisProperties.getYAxisProperties().setShowGridLines(DataAxisProperties.GRID
_LINES_NONE);

   String title=null;
   String[] legendLabels = {" "};
   Paint[] paints = new Paint[]{Color.blue};
   double[][] data = new double[][]{{2.4305638 , 76.2283304 , 59.5653992 

, 12.9185693 , -94.4018601 , 41.8006188 , 45.009868 , 

-63.0464611 , 0.4272433 , 17.0886599 , 48.8614666 , 89.5960671 

, 44.107602 , 1.8919965 , -22.7345809 , 97.4517988 , 

95.248644 , 58.0654687 , 82.1011746 , 36.7686102 , 25.6530842 

, 60.0724961 , -93.1170484 , 23.6652036 , 37.0968087 , 

48.8910213 , 79.85264 , 53.9105076, 95.248644 , 58.0654687 , 

82.1011746 , 36.7686102 , 59.5653992 , 12.9185693 , -94.4018601 , 

41.8006188, 0.4272433 , 17.0886599 , 48.8614666 , 89.5960671}};
   String[] xAxisLabels = {"93"," "," "," ","94"," "," "," ","95"," "," ","
","96"," "," "," ","97"," "," "," ","98"," "," "," ","99"," 

"," "," ","00"," "," "," ","01"," "," "," ","02"," "," "," "};

   DataAxisProperties dataAxisProperties = (DataAxisProperties)
axisProperties.getYAxisProperties();
   dataAxisProperties.setUserDefinedScale(-100,50);
   dataAxisProperties.setNumItems(5);
   dataAxisProperties.setShowZeroLine(true);
   
   BarChartProperties barChartProperties = new BarChartProperties();
   barChartProperties.setShowOutlinesFlag(false);
   String xAxisTitle = null;
   String yAxisTitle = null;
   IAxisDataSeries dataSeries = new DataSeries( xAxisLabels, xAxisTitle,
yAxisTitle, title );
   dataSeries.addIAxisPlotDataSet( new AxisChartDataSet( data, legendLabels,
paints, ChartType.BAR, 

barChartProperties ) );
   AxisChart axisChart = new AxisChart( dataSeries, chartProperties,
axisProperties, legendProperties, width, 

height );

   JPEGEncoder13.encode( axisChart, 1.0f, objFOS );
  }
  catch( Exception exp )
  {
   exp.printStackTrace();
  }
 }
}


Thanks,
Pal

 



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