The Java Boutique: Java Tutorial: Poor Man's Graphics - Page 3

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Tutorials : Poor Man's Graphics :

Contents

Horizontal and Vertical Bars

Using Javabeans to Produce the Bars

Scaling Your Chart

Using Javabeans to Produce the Bars

Now that we have the basic technique in place we can write a JavaBean which facilitates making the bars. For a single horizontal bar we need a method like this (the parameters should in this case be self-explanatory):

public String getHbar(int length, int width,
  String color, String label)

[The lines above are one line. It has been split for formatting purposes.]

And for the vertical bar we need this method:

public String getVbar(int length, int width, String color, String label)

These methods simply return the HTML for a single bar.

At the same time we'll add a possibility to define the font family and size for the chart. To adhere to common standards we'll use a style sheet definition. To set the font information and to retrieve the style sheet we need methods like this:

public void setCSS(String fontFamily, String fontSize)
public String getCSS()

You can find the code for the JavaBean here. A JSP-page which uses the bean is this:

<jsp:useBean id="graph" class="htmlgraph.Graph" scope="request" />
<%
graph.setCSS("Verdana","10px");
%>
<html>
<head>
<%=graph.getCSS()%>
</head>
<body>
<table
cellspacing=0 cellpadding=1 border=0>
<tr><%=graph.getHbar(300,10,"red","NBC")%></tr>
<tr><%=graph.getHbar(200,10,"green","CBS")%></tr>
<tr><%=graph.getHbar(320,10,"orange","CNN")%></tr>
</table>

<table cellspacing=0 cellpadding=1 border=0>
<tr>
<%=graph.getVbar(75,20,"red","ASP")%>
<%=graph.getVbar(87,20,"green","JSP")%>
<%=graph.getVbar(45,20,"orange","EJB")%>
<%=graph.getVbar(10,20,"black","CGI")%>
</tr>
</table>
</body>
</html>

This will produce these bars:

bar charts

Note that by changing the values for cellspacing and cellpadding you can fine-tune the layout of the bars.

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