#include "datastruct.h"void ZWorld::setWorld(int X,int Y,int W,int H,                        float x1,float y1,float x2,float y2){        this->X=X;this->Y=Y;        this->W=W;this->H=H;        this->x1=x1;this->y1=y1;        this->x2=x2;this->y2=y2;        scaleX=(float)W/(x2-x1);        scaleY=(float)H/(y1-y2);}float ZWorld::fx(int x){    return((float)(x-X)/scaleX+x1);}float  ZWorld::fy(int y){    return((float)(y-Y)/scaleY+y1);}