JHeatChart 介绍
JHeatChart 是一个 Java 类，用来创建热图图表。
示例代码：
// Create some dummy data.
double[][] data = new double[][]{{3,2,3,4,5,6},
{2,3,4,5,6,7},
{3,4,5,6,7,6},
{4,5,6,7,6,5}};
// Create our heat chart using our data.
HeatChart chart = new HeatChart(data);
// Customise the chart.
chart.setTitle("This is my chart title");
chart.setXAxisLabel("X Axis");
chart.setYAxisLabel("Y Axis");
// Output the chart to a file.
chart.savetoFile(new File("my-chart.png"));