View Compilation Error

0_0_22238748_28002.cpp: In function 'int main()':
0_0_22238748_28002.cpp:217:12: error: 'r' was not declared in this scope
         if(r<=D){
            ^
0_0_22238748_28002.cpp:224:18: error: 'r' was not declared in this scope
         double y=r*v0/v1,x1=y/x*D,x2=2*D-x1;
                  ^
0_0_22238748_28002.cpp:227:22: error: 'x1' was not declared in this scope
         Pts[0]=Point(x1,y);
                      ^
0_0_22238748_28002.cpp:229:22: error: 'x2' was not declared in this scope
         Pts[2]=Point(x2,y);
                      ^