xysteprendererdemo1.html

Jfreechart 源码例子 是和jfreechart development Guide文档相配套的

<b>XYStepRendererDemo1</b>
<p>
A "step" chart using data from an <code>XYDataset</code>.  Points in 
a series are connected by a line that first extends horizontally from one
x-value to the next, then vertically from the old y-value to the new y-value.