semantic.h

简单绘图语言

#ifdef _VC_COMPILER
#include <windows.h>
#include <wingdi.h>
extern HDC hDC;
#endif;

#ifdef _BC_COMPILER
  #include "graphics.h"
  #include "conio.h"
#endif

#include "parser.h"

#ifdef _VC_COMPILER
  #define red RGB(255,0,0)       //红色
  #define black RGB(0,0,0)       //黑色
#endif;

#ifdef _BC_COMPILER
#define white 255              //白色
#endif

//--------------外部函数声明
extern void DrawPixel(unsigned long x,unsigned long y); //绘制一个点
extern double GetExprValue(struct ExprNode* root);     //获得表达式的值
extern void DrawLoop(double Start,
					 double End,
					 double Step,
					 struct ExprNode *HorPtr,
					 struct ExprNode *VerPtr);
extern void DelExprTree(struct ExprNode *root);         //删除一棵树

#ifdef _BC_COMPILER
extern int InGraphMode;
extern int InitGraph(void);
extern void CloseGraph(void);
#endif