用dat的数据文件，文件中3个参数，两个坐标，一个类。要自己给出所有点属于哪个类。点run即可看到效果。同类比较密的地方画圈，不同类互不影响，也就是圈有重叠的情况，不同类的点和圈颜色不一样。-Use dat data files, file three parameters, two coordinates, a class. To give yourself all the points belong to which class. Point run to see the effect. Relatively dense circle of similar places, different types independently of each other, that is, there are overlapping circles, dots and circles of different colors in different categories.