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图1    图2    图3    图4

图形怎么传成这样了啊
4个图形分别为正方形，平行四边形，和两个正反相对的直角三角形

1. 自动切换显示多组图形。
2. 按0—9键分别对应有十种不同颜色显示图形。
3. 按奇数次（a或A）键自动切换显示图形，← 、→键无效。按偶数次（a或A）键取消自动显示，当按←键时显示上组图形，按→键时显示下组图形。
4. 能增加一个或更多新图形显示。