[求助]：请教virtual void zoom(double factor) = 0是怎么用的呢？不好意思，我是ARX

raohuan

请教virtual void zoom(double factor) = 0是怎么用的呢？不好意思，我是ARX的初学者，如果能有范例就最好了，谢谢！！

ishou

zoom(0.5);      //  ----may  Zoom to smaller
zoom(2.3);      //  ----may  Zoom to bigger
// etc.

Sorry!

zoom()=0 is a 纯虚函数 of a base class. You have  to define
a new class derived from  the base class, and then implement the
function zoom():

1. 
   
2. class  baseX
   
3. {
   
4.     virtual void  zoom (double factor) = 0;
   
5.      ..........;
   
6. };
   
7. 
   
8. class MyClass : public baseX
   
9. {
   
10.      virtual  void zoom(double factor)
    
11.      {
    
12.              // your implementing codes, such as
    
13.              acedCommabd(RTSTR, "zoom", RTREAL, factor, 0);
    
14.      }
    
15.      .............;
    
16. };
    

复制代码

raohuan

^_^
真是谢谢你了，我试试看！