节省资源，提高性能的一些修改 #10
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节省资源，提高性能的一些修改 #10
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DrawBackGround：通过将 HPEN 和 HBRUSH 作为静态变量提前创建，避免在每次绘制时都重复创建和删除，减少了资源开销。
DrawTetris：将 SelectObject 提前在循环外部进行，避免了在每次绘制方块时都进行多次调用，从而优化了性能。
checkTetris：减少了冗余的逻辑判断，并且把一部分循环优化成条件判断的形式
InitGame：对初始化流程进行了分解，使每个操作更加独立。
setLevel：使用宏和常量来代替，增加代码的可配置性和可读性。