/// <summary>
/// 静态函数，生成Tetris元素对象
/// </summary>
/// <returns></returns>
public static TetrisElement generate()
{
Random r = new Random(0);
//随机生成形状
int tstyle = getRandom();
tstyle = tstyle % 7;
TetrisStyle style = TetrisStyle.I;
style = (TetrisStyle)Enum.Parse(typeof(TetrisStyle), tstyle.ToString());
//随机生成起始坐标
int x = getRandom();
x = x % 10;
int y = 0;
//根据形状生成位置信息
TetrisElement element = new TetrisElement(style);
//内容由四个点组成，顺序：先上后下，先左后右
Point[] content = element.getContent(style);
//获取最小坐标和最大坐标，防止越界
int minX = element.getMinX(style);
int minY = element.getMinY(style);
int maxX = element.getMaxX(style);
int maxY = element.getMaxY(style);
//修正起始坐标
x = (x <= minX) ? minX : x;
x = (x >= maxX) ? maxX : x;
y = minY;
Point location = new Point(x, y);
element.location = location;
element.content = content;
return(element);
}
