import org.jfree.chart.*
import org.jfree.chart.plot.*
import org.jfree.data.category.*
dcd = new DefaultCategoryDataset()
dcd.with {
addValue(100, "ABC Inc.", "Jan 2010")
addValue(110, "ABC Inc.", "Feb 2010")
addValue(120, "ABC Inc.", "Mar 2010")
addValue(90, "DEF Corp.", "Jan 2010")
addValue(120, "DEF Corp.", "Feb 2010")
addValue(110, "DEF Corp.", "Mar 2010")
}
jfc = ChartFactory.createBarChart(
"売上推移",
"年月",
"売上",
dcd,
// 横方向にグラフを描画
PlotOrientation.HORIZONTAL,
true,
false,
false)
ChartUtilities.saveChartAsPNG(
new File("./bar-chart-horizontal.png"), jfc, 300, 200)
出力画像(bar-chart-horizontal.png)

動作環境
JDK1.6 Update 15, groovy 1.6.3, JFreeChart1.0.13, JCommon1.0.16
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