[C大程] 研讨题 CAD

/* 点击按钮，选择不同状态 */ 
/* 选择状态下，左键移动物体 */
/* 选择状态下，右键改变大小 */
/* 选择状态下，先选中，再delete和backspace删除图形 */
/* 文字状态下，先点击一处作为起始点，可以左移、右移、del、backspace*/ 

#include "graphics.h"
#include "extgraph.h"
#include "genlib.h"
#include "simpio.h"
#include "strlib.h"
#include "conio.h"
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>

#include <windows.h>
#include <olectl.h>
#include <stdio.h>
#include <mmsystem.h>
#include <wingdi.h>
#include <ole2.h>
#include <ocidl.h>
#include <winuser.h>
#include <math.h>

#define chooseStartX 0.25
#define chooseStopX 0.8
#define chooseStartY 0.6
#define chooseStopY 0.9

#define rectangleHeight 0.3
#define rectangleWidth 0.55

#define lineStartX 0.9
#define lineStopX 1.45
#define lineStartY 0.6
#define lineStopY 0.9

#define rectangleStartX 1.6
#define rectangleStopX 2.15
#define rectangleStartY 0.6
#define rectangleStopY 0.9

#define ellipseStartX 2.3
#define ellipseStopX 2.85
#define ellipseStartY 0.6
#define ellipseStopY 0.9

#define textStartX 3
#define textStopX 3.55
#define textStartY 0.6
#define textStopY 0.9

#define TIMER_BLINK 1

enum{line,rectangle,ellipse,text,null};

const int mseconds = 1000;

static int choosenow=0;
static bool isChoose=FALSE;
static bool startDrawText=FALSE;
static bool isSave=TRUE;

static double tx,ty;
static int start=-1;

char Text[100];
int textlen=0;
static int location=-1;

static bool isBlink = FALSE;  
static bool isDisplay = FALSE; 

typedef struct node save;
static int count=0;

double x_location,y_location;

struct node
{
	double x1;
	double y1;
	double x2;
	double y2;
	int type;
};
save onScreen[100];
//判断是否在选区内 
bool inBox(double x0, double y0, double x1, double x2, double y1, double y2)
{
	return (x0 >= x1 && x0 <= x2 && y0 >= y1 && y0 <= y2)||
	       (x0 >= x1 && x0 <= x2 && y0 <= y1 && y0 >= y2)||
		   (x0 <= x1 && x0 >= x2 && y0 >= y1 && y0 <= y2)||
		   (x0 <= x1 && x0 >= x2 && y0 <= y1 && y0 >= y2);
};

//画矩形 
void DrawRectangle(double x,double y)
{
	DrawLine(x,0);
	DrawLine(0,-y);
	DrawLine(-x,0);
	DrawLine(0,y);
}

//重新绘制图形 
void ReDraw()
{
	int i,cnt=0;
	for(i=0;i<count;i++){
		if(onScreen[i].type==line){
			MovePen(onScreen[i].x1,onScreen[i].y1);
			DrawLine(onScreen[i].x2-onScreen[i].x1,onScreen[i].y2-onScreen[i].y1);
		}
		else if(onScreen[i].type==rectangle){
			MovePen(onScreen[i].x1,onScreen[i].y1);
			DrawRectangle(onScreen[i].x2-onScreen[i].x1,onScreen[i].y1-onScreen[i].y2);
		}
		else if(onScreen[i].type==ellipse){
			MovePen(onScreen[i].x1,onScreen[i].y1);
			DrawEllipticalArc((onScreen[i].x1-onScreen[i].x2)/2.0,(onScreen[i].y2-onScreen[i].y1),0,360);
		}
		else if(onScreen[i].type==text){
			MovePen(onScreen[i].x1,onScreen[i].y1);
			int j;
			char str[2]={0,0};
			for(j=onScreen[i].x2;j<=onScreen[i].y2;j++){
				str[0]=Text[j];
				DrawTextString(str);
			}
		}
    }
}

//基本布局 
void SetLayout()
{
	MovePen(chooseStartX,chooseStopY);
	DrawRectangle(rectangleWidth,rectangleHeight);
	MovePen(lineStartX,lineStopY);
	DrawRectangle(rectangleWidth,rectangleHeight);
	MovePen(rectangleStartX,rectangleStopY);
	DrawRectangle(rectangleWidth,rectangleHeight);
	MovePen(ellipseStartX,ellipseStopY);
	DrawRectangle(rectangleWidth,rectangleHeight);
	MovePen(textStartX,textStopY);
	DrawRectangle(rectangleWidth,rectangleHeight);
	MovePen(0.3,0.7);
	DrawTextString("选择       ");
	DrawTextString("直线　   ");
	DrawTextString("矩形        ");
	DrawTextString("椭圆        ");
	DrawTextString("文字"); 
}

//插入图形对象 
void Insert(int type,double x1,double y1,double x2,double y2)
{
	onScreen[count].x1=x1;
	onScreen[count].y1=y1;
	onScreen[count].x2=x2;
	onScreen[count].y2=y2;
	onScreen[count].type=type;
	count++;
}

//改变直线长度 
void ChangeLineLength(double x1,double y1,double x2,double y2,double sx,double sy,double mx,double my,double *lx,double *ly,double *rx,double *ry)
{
	double d=(x2-x1)*(my-sy)-(y2-y1)*(mx-sx)/sqrt((x1+x2)*(x1+x2)+(y1+y2)*(y1+y2));
	double s=(mx-sx)*(mx-sx)+(my-sy)*(my-sy);
	double l=sqrt(fabs(s-d*d));
	if(x2==x1){ 
		if((sy>(y1+y2)/2.0&&my>sy)||(sy<(y1+y2)/2.0&&my<sy)){
			*ly-=l;
			*ry+=2*l;
		}
		else if((sy>(y1+y2)/2.0&&my<sy)||(sy<(y1+y2)/2.0&&my>sy)){
			*ly+=l;
			*ry-=2*l;
		}
	}
	else if(y2==y1){
		if((sx>(x1+x2)/2.0&&mx>sx)||(sx<(x1+x2)/2.0&&mx<sx)){
			*lx+=l;
			*rx-=2*l;
		}
		else if((sx>(x1+x2)/2.0&&mx<sx)||(sx<(x1+x2)/2.0&&mx>sx)){
			*lx-=l;
			*rx+=2*l;
		}
	} 
	else{
		double delta_y=l*sqrt((y1-y2)*(y1-y2)/((y1-y2)*(y1-y2)+(x1-x2)*(x1-x2)));
		double delta_x=l*sqrt((x1-x2)*(x1-x2)/((y1-y2)*(y1-y2)+(x1-x2)*(x1-x2)));
		if((x2>x1&&y2>y1)||(x2<x1&&y2<y1)){
			if(((x1-mx)*(x1-mx)+(y1-my)*(y1-my))>((x2-mx)*(x2-mx)+(y2-my)*(y2-my))){
				//点在右半部分 
				if(mx>sx)*lx-=delta_x,*rx+=2*delta_x,*ly-=delta_y,*ry+=2*delta_y;
				else *lx+=delta_x,*rx-=2*delta_x,*ly+=delta_y,*ry-=2*delta_y;
			}
			else{
				//点在左半部分 
				if(mx>sx)*lx+=delta_x,*rx-=2*delta_x,*ly+=delta_y,*ry-=2*delta_y;
				else *lx-=delta_x,*rx+=2*delta_x,*ly-=delta_y,*ry+=2*delta_y;
			}
	    }
	    else{
			if(((x1-mx)*(x1-mx)+(y1-my)*(y1-my))>((x2-mx)*(x2-mx)+(y2-my)*(y2-my))){
				//点在右半部分 
				if(mx>sx)*lx-=delta_x,*rx+=2*delta_x,*ly+=delta_y,*ry-=2*delta_y;
				else *lx+=delta_x,*rx-=2*delta_x,*ly-=delta_y,*ry+=2*delta_y;
			}
			else{
				//点在左半部分 
				if(mx>sx)*lx+=delta_x,*rx-=2*delta_x,*ly-=delta_y,*ry+=2*delta_y;
				else *lx-=delta_x,*rx+=2*delta_x,*ly+=delta_y,*ry-=2*delta_y;
			}
	    }
	}		 	
}

void MouseEventProcess(int x, int y, int button, int event)
{
	static bool isDrawLine = FALSE;
	static bool isDrawEllipse = FALSE;
	static bool isDrawRectangle = FALSE;
	static bool isDrawText = FALSE;
	
	static bool startDrawLine = FALSE;
	static bool startDrawRectangle = FALSE;
	static bool startDrawEllipse = FALSE;
	
	static bool changeLine = FALSE;
	static bool changeEllipse = FALSE;
	static bool changeRectangle = FALSE;
	static bool changeText = FALSE;
	
	static bool chooseLine = FALSE;
	static bool chooseRectangle = FALSE;
	static bool chooseEllipse = FALSE;
	static bool chooseText = FALSE;
	
	static int changenow=0;
	
	double mx, my;
	static double lx, ly;
	static double sx=0.0, sy=0.0;
	static double rx, ry;
    
	mx = ScaleXInches(x);
	my = ScaleYInches(y);
	switch(event){
		case BUTTON_DOWN:
		    if(button==LEFT_BUTTON){
		    	if(inBox(mx,my,0,GetWindowWidth(),1,GetWindowHeight())){
		    		//扫描哪个按钮处于激活态，并做相应的准备工作 
		   		 	if(isChoose){
						int i;
		    			double x1,x2,y1,y2;
		    			for(i=0;i<count;i++){
		    				x1=onScreen[i].x1,x2=onScreen[i].x2,y1=onScreen[i].y1,y2=onScreen[i].y2;
		    				if(onScreen[i].type==text){
		    					string str;
		    					str=SubString(Text,x2,y2);   
		    					double len=TextStringWidth(str);
		    					if(inBox(mx,my,x1,x1+len,y1-0.1,y1+0.2)){
		    						chooseText=TRUE;
		    						choosenow=i;
		    						lx=x1,ly=y1;
		    						sx=mx-x1,sy=my-y1;
		    						break;
		    					}
		    				}
		    				if(onScreen[i].type==rectangle){
		    					if(inBox(mx,my,x1,x2,y1,y2)){
							   		chooseRectangle=TRUE;
							   		choosenow=i;
							   		lx=x1,ly=y1;
							   		sx=mx,sy=my;
						 	  		break;
								}
		    				}
		    				else if(onScreen[i].type==ellipse){
		    					if(inBox(mx,my,x1,x2,2*y1-y2,y2)){
		    						chooseEllipse=TRUE;
		    						choosenow=i;
		    						lx=x1,ly=y1;
		    						sx=mx,sy=my;
		    						break;
		    					}
		    				}
		    				else if(onScreen[i].type==line){
		    					if(fabs((y2-y1)*mx-(x2-x1)*my-x1*(y2-y1)+y1*(x2-x1))<=
							    	0.5*sqrt((y2-y1)*(y2-y1)+(x2-x1)*(x2-x1))){
		    						chooseLine=TRUE;
		    						choosenow=i;
		    						lx=x1,ly=y1;
		    						sx=mx,sy=my;
		    						break;
		    					}
		    				}
		    			}
		    		}
					else if(isDrawLine){
						startDrawLine=TRUE;
						MovePen(mx,my);
						sx=mx,sy=my;
						lx=mx,ly=my;
 	 				}
 	 				else if(isDrawRectangle){
 	 					startDrawRectangle=TRUE;
 	 					MovePen(mx,my);
 	 					sx=mx,sy=my;
 	 					lx=mx,ly=my;
 	 				}
 	 				else if(isDrawEllipse){
 	 					startDrawEllipse=TRUE;
 	 					MovePen(mx,my);
 	 					sx=mx,sy=my;
 	 					lx=mx,ly=my;
 	 				}
 	 				else if(isDrawText){
 	 					startTimer(TIMER_BLINK, mseconds);
 	 					startDrawText=TRUE;
						if(isBlink&&isDisplay){
	 	     			   	SetEraseMode(TRUE);
	 	     			    MovePen(GetCurrentX(), GetCurrentY());
 	             		 	DrawTextString("_");
 	         	  		 	SetEraseMode(FALSE);
		       			}
 	 					if(textlen-1!=start&&textlen!=0){
 	 						Insert(text,tx,ty,start,textlen-1);
 	 						isSave=TRUE;
 	 					}
 	 					MovePen(mx,my);
 	 					tx=mx,ty=my;
 	 					start=textlen;
 	 				}
		    	}
		    	//更改按钮的激活态 
				else if(inBox(mx,my,textStartX,textStopX,textStartY,textStopY)){
					isBlink=TRUE;
					MovePen(textStartX,textStopY);
					SetPenColor("Red");
					DrawRectangle(rectangleWidth,rectangleHeight);
					SetPenColor("Black");
					if(isDrawRectangle){
						isDrawRectangle=FALSE;
						MovePen(rectangleStartX,rectangleStopY);
						DrawRectangle(rectangleWidth,rectangleHeight);
					}
					else if(isDrawEllipse){
						isDrawEllipse=FALSE;
						MovePen(ellipseStartX,ellipseStopY);
						DrawRectangle(rectangleWidth,rectangleHeight);
					}
					else if(isDrawLine){
						isDrawLine=FALSE;
						MovePen(lineStartX,lineStopY);
						DrawRectangle(rectangleWidth,rectangleHeight);
					}
					else if(isChoose){
						isChoose=FALSE;
						MovePen(chooseStartX,chooseStopY);
						DrawRectangle(rectangleWidth,rectangleHeight);
					}
					if(isDrawText==FALSE)isDrawText=TRUE;
 	 			}
				else if(inBox(mx,my,lineStartX,lineStopX,lineStartY,lineStopY)){
					MovePen(lineStartX,lineStopY);
					SetPenColor("Red");
					DrawRectangle(rectangleWidth,rectangleHeight);
					SetPenColor("Black");
					if(!isSave){
						isSave=TRUE;
						Insert(text,tx,ty,start,textlen-1);
					}
					if(isDrawRectangle){
						isDrawRectangle=FALSE;
						MovePen(rectangleStartX,rectangleStopY);
						DrawRectangle(rectangleWidth,rectangleHeight);
					}
					else if(isDrawEllipse){
						isDrawEllipse=FALSE;
						MovePen(ellipseStartX,ellipseStopY);
						DrawRectangle(rectangleWidth,rectangleHeight);
					}
					else if(isDrawText){
						if(isBlink&&isDisplay){
	 	     			   	SetEraseMode(TRUE);
	 	     			    MovePen(x_location, y_location);
 	             		 	DrawTextString("_");
 	         	  		 	SetEraseMode(FALSE);
 	         	  		 	ReDraw();
		       			}
		       			start=textlen-1;
						isBlink=FALSE;
						cancelTimer(TIMER_BLINK);
						isDrawText=FALSE;
						startDrawText=FALSE;
						MovePen(textStartX,textStopY);
						DrawRectangle(rectangleWidth,rectangleHeight);						
					}
					else if(isChoose){
						isChoose=FALSE;
						MovePen(chooseStartX,chooseStopY);
						DrawRectangle(rectangleWidth,rectangleHeight);
					}
					if(isDrawLine==FALSE)isDrawLine=TRUE;
 	 			}
 	 			else if(inBox(mx,my,rectangleStartX,rectangleStopX,
				       rectangleStartY,rectangleStopY)){
				    MovePen(rectangleStartX,rectangleStopY);
					SetPenColor("Red");
					DrawRectangle(rectangleWidth,rectangleHeight);
					SetPenColor("Black");
					if(!isSave){
						isSave=TRUE;
						Insert(text,tx,ty,start,textlen-1);
					}
					if(isDrawLine){
						isDrawLine=FALSE;
						MovePen(lineStartX,lineStopY);
						DrawRectangle(rectangleWidth,rectangleHeight);
					}
					else if(isDrawEllipse){
						isDrawEllipse=FALSE;
						MovePen(ellipseStartX,ellipseStopY);
						DrawRectangle(rectangleWidth,rectangleHeight);
					}
					else if(isDrawText){
						if(isBlink&&isDisplay){
	 	     			   	SetEraseMode(TRUE);
	 	     			    MovePen(x_location, y_location);
 	             		 	DrawTextString("_");
 	         	  		 	SetEraseMode(FALSE);
 	         	  		 	ReDraw();
		       			}
		       			start=textlen-1;
						isBlink=FALSE;
						cancelTimer(TIMER_BLINK);
						isDrawText=FALSE;
						startDrawText=FALSE;
						MovePen(textStartX,textStopY);
						DrawRectangle(rectangleWidth,rectangleHeight);
					}
					else if(isChoose){
						isChoose=FALSE;
						MovePen(chooseStartX,chooseStopY);
						DrawRectangle(rectangleWidth,rectangleHeight);
					}
					if(isDrawRectangle==FALSE)isDrawRectangle=TRUE;      	
				}
				else if(inBox(mx,my,ellipseStartX,ellipseStopX,
				              ellipseStartY,ellipseStopY)){
				    MovePen(ellipseStartX,ellipseStopY);
					SetPenColor("Red");
					DrawRectangle(rectangleWidth,rectangleHeight);
					SetPenColor("Black");
					if(!isSave){
						isSave=TRUE;
						Insert(text,tx,ty,start,textlen-1);
					}
				    if(isDrawLine){
						isDrawLine=FALSE;
						MovePen(lineStartX,lineStopY);
						DrawRectangle(rectangleWidth,rectangleHeight);
					}
					else if(isDrawRectangle){
						isDrawRectangle=FALSE;
						MovePen(rectangleStartX,rectangleStopY);
						DrawRectangle(rectangleWidth,rectangleHeight);
					}
					else if(isDrawText){
						if(isBlink&&isDisplay){
	 	     			   	SetEraseMode(TRUE);
	 	     			    MovePen(x_location, y_location);
 	             		 	DrawTextString("_");
 	         	  		 	SetEraseMode(FALSE);
 	         	  		 	ReDraw();
		       			}
						isBlink=FALSE;
						start=textlen-1;
						cancelTimer(TIMER_BLINK);
						isDrawText=FALSE;
						startDrawText=FALSE;
						MovePen(textStartX,textStopY);
						DrawRectangle(rectangleWidth,rectangleHeight);						
					}
					else if(isChoose){
						isChoose=FALSE;
						MovePen(chooseStartX,chooseStopY);
						DrawRectangle(rectangleWidth,rectangleHeight);
					}
					if(isDrawEllipse==FALSE)isDrawEllipse=TRUE;
				} 
 	 			else if(inBox(mx,my,chooseStartX,chooseStopX,
				              chooseStartY,chooseStopY)){
				    MovePen(chooseStartX,chooseStopY);
					SetPenColor("Red");
					DrawRectangle(rectangleWidth,rectangleHeight);
					SetPenColor("Black");
					if(!isSave){
						isSave=TRUE;
						Insert(text,tx,ty,start,textlen-1);
					}
				    if(isDrawLine){
						isDrawLine=FALSE;
						MovePen(lineStartX,lineStopY);
						DrawRectangle(rectangleWidth,rectangleHeight);
					}
					else if(isDrawRectangle){
						isDrawRectangle=FALSE;
						MovePen(rectangleStartX,rectangleStopY);
						DrawRectangle(rectangleWidth,rectangleHeight);
					}
					else if(isDrawEllipse){
						isDrawEllipse=FALSE;
						MovePen(ellipseStartX,ellipseStopY);
						DrawRectangle(rectangleWidth,rectangleHeight);
					}
					else if(isDrawText){
						if(isBlink&&isDisplay){
	 	     			   	SetEraseMode(TRUE);
	 	     			    MovePen(x_location, y_location);
 	             		 	DrawTextString("_");
 	         	  		 	SetEraseMode(FALSE);
 	         	  		 	ReDraw();
		       			}
		       			start=textlen-1;
						isBlink=FALSE;
						cancelTimer(TIMER_BLINK);
						isDrawText=FALSE;
						startDrawText=FALSE;
						MovePen(textStartX,textStopY);
						DrawRectangle(rectangleWidth,rectangleHeight);						
					}	
					if(isChoose==FALSE)isChoose=TRUE;			    
				}
			}
			//右键选择图形的准备工作 
			else if(button==RIGHT_BUTTON){
				if(isChoose){
		    		int i;
		    		double x1,x2,y1,y2;
		    		for(i=0;i<count;i++){
		    			x1=onScreen[i].x1,x2=onScreen[i].x2,y1=onScreen[i].y1,y2=onScreen[i].y2;
		    			if(onScreen[i].type==rectangle){
		    				if(inBox(mx,my,x1,x2,y1,y2)){
						   		changeRectangle=TRUE;
						   		changenow=i;
						   		lx=x1,ly=y1;
						   		sx=mx,sy=my;
						   		rx=x2-x1,ry=y1-y2;
						   		break;
							}
		    			}
		    			else if(onScreen[i].type==ellipse){
		    				if(inBox(mx,my,x1,x2,2*y1-y2,y2)){
		    					changeEllipse=TRUE;
		    					changenow=i;
		    					lx=x1,ly=y1;
		    					sx=mx,sy=my;
		    					rx=(x1-x2)/2.0,ry=y2-y1;
		    					break;
		    				}
		    			}
		    			else if(onScreen[i].type==line){
		    				if(fabs((y2-y1)*mx-(x2-x1)*my-x1*(y2-y1)+y1*(x2-x1))<=
							    0.3*sqrt((y2-y1)*(y2-y1)+(x2-x1)*(x2-x1))){		    
		    					changeLine=TRUE;
		    					changenow=i;
		    					lx=x1,ly=y1;
		    					sx=mx,sy=my;
		    					rx=x2-x1,ry=y2-y1;
		    					break;
		    				}
		    			}
		    		}
				}
			}
 	 		break;
 	 	case BUTTON_UP:
 	 		if(startDrawLine){
 	 			ReDraw();
 	 		    if((sx<mx&&sy<my)||(sx>mx&&sy>my))Insert(line,sx,sy,mx,my);
 	 		    else Insert(line,mx,my,sx,sy);
 	 			startDrawLine=FALSE;
 	 		}
 	 		else if(startDrawRectangle){
 	 			ReDraw();
 	 		    Insert(rectangle,sx,sy,mx,my);
 	 			startDrawRectangle=FALSE;
 	 		}
 	 		else if(startDrawEllipse){
			    ReDraw();
				Insert(ellipse,sx,sy,mx,my); 	 	         
 	 			startDrawEllipse=FALSE;
 	 		}
 	 		else if(chooseRectangle){
 	 		    double xx=onScreen[choosenow].x2-onScreen[choosenow].x1;
 	 		    double yy=onScreen[choosenow].y2-onScreen[choosenow].y1;
 	 			onScreen[choosenow].x1=lx;
 	 			onScreen[choosenow].x2=lx+xx;
 	 			onScreen[choosenow].y1=ly;
 	 			onScreen[choosenow].y2=ly+yy;
 	 			ReDraw();
 	 			chooseRectangle=FALSE;
 	 		}
 	 		else if(chooseEllipse){
 	 			double xx=onScreen[choosenow].x2-onScreen[choosenow].x1;
 	 			double yy=onScreen[choosenow].y2-onScreen[choosenow].y1;
 	 			onScreen[choosenow].x1=lx;
 	 			onScreen[choosenow].x2=lx+xx;
 	 			onScreen[choosenow].y1=ly;
 	 			onScreen[choosenow].y2=ly+yy;
 	 			ReDraw();
 	 			chooseEllipse=FALSE;
 	 		}
 	 		else if(chooseLine){
 	 			double xx=onScreen[choosenow].x2-onScreen[choosenow].x1;
 	 			double yy=onScreen[choosenow].y2-onScreen[choosenow].y1;
 	 			onScreen[choosenow].x1=lx;
 	 			onScreen[choosenow].x2=lx+xx;
 	 			onScreen[choosenow].y1=ly;
 	 			onScreen[choosenow].y2=ly+yy;
 	 			ReDraw();
 	 			chooseLine=FALSE;
 	 		}
 	 		else if(chooseText){
 	 			double xx=onScreen[choosenow].x2-onScreen[choosenow].x1;
 	 			double yy=onScreen[choosenow].y2-onScreen[choosenow].y1;
 	 			onScreen[choosenow].x1=lx;
 	 			onScreen[choosenow].y1=ly;
 	 			ReDraw();
 	 			chooseText=FALSE;
 	 		}
 	 		else if(changeRectangle){
 	 			onScreen[changenow].x1=lx;
 	 			onScreen[changenow].x2=lx+rx;
 	 			onScreen[changenow].y1=ly;
 	 			onScreen[changenow].y2=ly-ry;
 	 			ReDraw();
 	 			changeRectangle=FALSE; 	 			
 	 		} 
 	 		else if(changeEllipse){
 	 			onScreen[changenow].x1=lx;
 	 			onScreen[changenow].x2=lx-rx*2;
 	 			onScreen[changenow].y1=ly;
 	 			onScreen[changenow].y2=ly+ry;
 	 			ReDraw();
 	 			changeEllipse=FALSE;
 	 		}
 	 		else if(changeLine){
 	 			onScreen[changenow].x1=lx;
 	 			onScreen[changenow].x2=lx+rx;
 	 			onScreen[changenow].y1=ly;
 	 			onScreen[changenow].y2=ly+ry;
 	 			ReDraw();
 	 			changeLine=FALSE;
 	 		}
 	 		break;
 	 	case MOUSEMOVE:
 	 		//画图 
 	 		if(startDrawLine){
 	 			SetEraseMode(TRUE);
 	 			MovePen(sx,sy);
 	 			DrawLine(lx-sx,ly-sy);
 	 			SetEraseMode(FALSE);
 	 			MovePen(sx,sy);
 	 			DrawLine(mx-sx,my-sy);
 	 			lx=mx,ly=my;
 	 		}
 	 		else if(startDrawRectangle){
 	 			SetEraseMode(TRUE);
 	 			MovePen(sx,sy);
 	 			DrawRectangle(lx-sx,sy-ly);
 	 			SetEraseMode(FALSE);
 	 			MovePen(sx,sy);
 	 			DrawRectangle(mx-sx,sy-my);
 	 			lx=mx,ly=my;
 	 		}
 	 		else if(startDrawEllipse){
 	 			SetEraseMode(TRUE);
 	 			MovePen(sx,sy);
 	 			DrawEllipticalArc((sx-lx)/2.0,(ly-sy),0,360);
 	 			SetEraseMode(FALSE);
 	 			MovePen(sx,sy);
 	 			DrawEllipticalArc((sx-mx)/2.0,(my-sy),0,360);
 	 			lx=mx,ly=my;
 	 		}
 	 		//移动 
 	 		else if(chooseRectangle){
 	 			int i=choosenow;
 	 			double x1=onScreen[i].x1,x2=onScreen[i].x2,y1=onScreen[i].y1,y2=onScreen[i].y2;
 	 			SetEraseMode(TRUE);
 	 			MovePen(lx,ly);
 	 			DrawRectangle(x2-x1,y1-y2);
 	 			SetEraseMode(FALSE);
 	 			lx=mx-(sx-x1),ly=my-(sy-y1);
 	 			MovePen(lx,ly);
 	 			DrawRectangle(x2-x1,y1-y2);
 	 		}
 	 		else if(chooseEllipse){
 	 			int i=choosenow;
 	 			double x1=onScreen[i].x1,x2=onScreen[i].x2,y1=onScreen[i].y1,y2=onScreen[i].y2;
 	 			SetEraseMode(TRUE);
 	 			MovePen(lx,ly);
 	 			DrawEllipticalArc((x1-x2)/2.0,y2-y1,0,360);
 	 			SetEraseMode(FALSE);
 	 			lx=mx-(sx-x1),ly=my-(sy-y1);
 	 			MovePen(lx,ly);
 	 			DrawEllipticalArc((x1-x2)/2.0,y2-y1,0,360);
 	 		}
 	 		else if(chooseLine){
 	 			int i=choosenow;
 	 			double x1=onScreen[i].x1,x2=onScreen[i].x2,y1=onScreen[i].y1,y2=onScreen[i].y2;
 	 			SetEraseMode(TRUE);
 	 			MovePen(lx,ly);
 	 			DrawLine(x2-x1,y2-y1);
 	 			SetEraseMode(FALSE);
 	 			lx=mx-(sx-x1),ly=my-(sy-y1);
 	 			MovePen(lx,ly);
 	 			DrawLine(x2-x1,y2-y1); 	 			
 	 		}
 	 		else if(chooseText){
 	 			static char str[2]={0,0};
				int j,i=choosenow;
 	 			double x1=onScreen[i].x1,x2=onScreen[i].x2,y1=onScreen[i].y1,y2=onScreen[i].y2;
				SetEraseMode(TRUE);
				MovePen(lx,ly);
				for(j=x2;j<=y2;j++){
					str[0]=Text[j];
					DrawTextString(str);
				}
				SetEraseMode(FALSE);
				lx=mx-sx,ly=my-sy;
				MovePen(lx,ly);
				for(j=x2;j<=y2;j++){
					str[0]=Text[j];
					DrawTextString(str);
				}		
 	 		}
 	 		//大小改变 
 	 		else if(changeLine){
 	 			int i=changenow;
 	 			double x1=onScreen[i].x1,x2=onScreen[i].x2,y1=onScreen[i].y1,y2=onScreen[i].y2;
 	 			SetEraseMode(TRUE);
 	 			MovePen(lx,ly);
 	 			DrawLine(rx,ry);
 	 			SetEraseMode(FALSE);
 	 			ChangeLineLength(x1,y1,x2,y2,sx,sy,mx,my,&lx,&ly,&rx,&ry);
                MovePen(lx,ly);
                DrawLine(rx,ry);	 			
                sx=mx,sy=my;
 	 		}
 	 		else if(changeRectangle){
 	 			int i=changenow;
 	 			double x1=onScreen[i].x1,x2=onScreen[i].x2,y1=onScreen[i].y1,y2=onScreen[i].y2;
 	 			SetEraseMode(TRUE);
 	 			MovePen(lx,ly);
 	 			DrawRectangle(rx,ry);
 	 			SetEraseMode(FALSE);
 	 			ry=(my-(y1+y2)/2.0)*fabs(y1-y2)/fabs(sy-(y1+y2)/2.0);
 	 			rx=(mx-(x1+x2)/2.0)*fabs(x1-x2)/fabs(sx-(x1+x2)/2.0);
 	 			lx=(x1+x2-rx)/2.0;
 	 			ly=(y1+y2+ry)/2.0;
 	 			MovePen(lx,ly);
 	 			DrawRectangle(rx,ry);
 	 		}
 	 		else if(changeEllipse){
 	 			int i=changenow;
 	 			double x1=onScreen[i].x1,x2=onScreen[i].x2,y1=onScreen[i].y1,y2=onScreen[i].y2;
 	 			SetEraseMode(TRUE);
 	 			MovePen(lx,ly);
 	 			DrawEllipticalArc(rx,ry,0,360);
 	 			SetEraseMode(FALSE);
 	 			ry=(my-y1)*fabs(y1-y2)/fabs(sy-y1);
 	 			rx=0.5*(mx-(x1+x2)/2.0)*fabs(x1-x2)/fabs(sx-(x1+x2)/2.0);
 	 			lx=(x1+x2)/2.0+rx;
 	 			MovePen(lx,ly);
 	 		    DrawEllipticalArc(rx,ry,0,360);	 			
 	 		}	
 	 		break;
 	 }
}

void KeyboardEventProcess(int key,int event)
{
	static char str[2]={0,0};
	switch(event){
		case KEY_DOWN:
			if(key==VK_DELETE||key==VK_BACK){
				//删除选区 
				if(isChoose){
					SetEraseMode(TRUE);
 	 				int i=choosenow;
 	 				double x1=onScreen[i].x1,x2=onScreen[i].x2,y1=onScreen[i].y1,y2=onScreen[i].y2;
 	 				SetEraseMode(TRUE);
					if(onScreen[i].type==line){
						MovePen(onScreen[i].x1,onScreen[i].y1);
						DrawLine(onScreen[i].x2-onScreen[i].x1,onScreen[i].y2-onScreen[i].y1);
					}
					else if(onScreen[i].type==rectangle){
						MovePen(onScreen[i].x1,onScreen[i].y1);
						DrawRectangle(onScreen[i].x2-onScreen[i].x1,onScreen[i].y1-onScreen[i].y2);
					}
					else if(onScreen[i].type==ellipse){
						MovePen(onScreen[i].x1,onScreen[i].y1);
						DrawEllipticalArc((onScreen[i].x1-onScreen[i].x2)/2.0,(onScreen[i].y2-onScreen[i].y1),0,360);
					}
					else if(onScreen[i].type==text){
						MovePen(onScreen[i].x1,onScreen[i].y1);
						int j;
						char str[2]={0,0};
						for(j=onScreen[i].x2;j<=onScreen[i].y2;j++){
							str[0]=Text[j];
							DrawTextString(str);
						}
					}
 					SetEraseMode(FALSE);
					onScreen[i].type=null; 						
				}
				//删除文本 
				else if(startDrawText){
					if(location<0)return;
					int i;
					SetEraseMode(TRUE);
             	   if (isBlink && isDisplay) {
	 	     		   MovePen(GetCurrentX(), GetCurrentY());
 	         	 	   DrawTextString("_");
 	        	  	   MovePen(GetCurrentX()-TextStringWidth("_"), GetCurrentY());
		    	    }
 	 				str[0]=Text[location];
					MovePen(GetCurrentX()-TextStringWidth(str),GetCurrentY());
					DrawTextString(str);
					if(location==textlen)MovePen(GetCurrentX()-TextStringWidth(str),GetCurrentY());
					else{
						string s1,s2;
						s1=SubString(Text,location+1,textlen);
						s2=SubString(Text,location,textlen); 
						SetEraseMode(TRUE);
						DrawTextString(s1);
						SetEraseMode(FALSE);
						MovePen(GetCurrentX()-TextStringWidth(s2),GetCurrentY());
						DrawTextString(s1);
						MovePen(GetCurrentX()-TextStringWidth(s1),GetCurrentY());
					}
		   	    	for(i=location;i<textlen;i++){
		        		Text[i]=Text[i+1];
		      	  	}
		      		Text[--textlen]='\0';
					location--;
 					SetEraseMode(FALSE);
					x_location=GetCurrentX();
					y_location=GetCurrentY();					
				}
			}
			else if(key==VK_LEFT){
				if(location<0)return;
				if (isBlink && isDisplay) {
	 	     	   	SetEraseMode(TRUE);
	 	     	    MovePen(GetCurrentX(), GetCurrentY());
 	              	DrawTextString("_");
 	         	   	SetEraseMode(FALSE);
		           	MovePen(GetCurrentX()-TextStringWidth("_"), GetCurrentY());
		       	}
		       	str[0]=Text[location];
		       	MovePen(GetCurrentX()-TextStringWidth(str),GetCurrentY());
		       	location--;
		    	x_location=GetCurrentX();
				y_location=GetCurrentY();
			}
			else if(key==VK_RIGHT){
				if(location>=textlen)return; 
				if (isBlink && isDisplay){
	 	     	   	SetEraseMode(TRUE);
	 	     	    MovePen(GetCurrentX(), GetCurrentY());
 	              	DrawTextString("_");
 	         	   	SetEraseMode(FALSE);
		           	MovePen(GetCurrentX()-TextStringWidth("_"), GetCurrentY());
		       	}
		       	str[0]=Text[location+1];
		       	MovePen(GetCurrentX()+TextStringWidth(str),GetCurrentY());
		       	location++;
		       	x_location=GetCurrentX();
				y_location=GetCurrentY();
			}
	}
}

void CharEventProcess(char key)
{
	if(!startDrawText)return; 
	if(textlen>=99||GetCurrentX()>=GetWindowWidth()-0.2)return;
	if(key==VK_BACK||key==VK_DELETE)return;
	else{
		if(textlen>start)isSave=FALSE;
		char str[2]={0,0};
		str[0]=key;
		if(location==textlen-1){
			Text[textlen++]=key;
			Text[textlen]='\0';
			DrawTextString(str);
			location++;
		}
		else{
			int i;
			string s1;
			s1=SubString(Text,location+1,textlen); 
			SetEraseMode(TRUE);
			DrawTextString(s1);
			SetEraseMode(FALSE);
			MovePen(GetCurrentX()-TextStringWidth(s1),GetCurrentY());
			DrawTextString(str);
			DrawTextString(s1);
			MovePen(GetCurrentX()-TextStringWidth(s1),GetCurrentY());
			textlen++;
			location++;
			for(i=textlen;i>=location+1;i--){
				Text[i]=Text[i-1];
			}
			Text[location]=key;
		}
   	    if (isBlink&&isDisplay) {
			SetEraseMode(TRUE);
			MovePen(GetCurrentX()-TextStringWidth(str), GetCurrentY());
 			DrawTextString("_");
 			MovePen(GetCurrentX()-TextStringWidth("_"),GetCurrentY());
 			SetEraseMode(FALSE);
 			DrawTextString(str);
		}
		else{
			MovePen(GetCurrentX()-TextStringWidth(str),GetCurrentY());
			DrawTextString(str);
		}
		x_location=GetCurrentX();
		y_location=GetCurrentY();
	}	
}

void TimerEventProcess(int timerID)
{
	double x, y;
	bool erasemode;
	switch (timerID) {
		case TIMER_BLINK:
		if (!isBlink) return;
	    erasemode = GetEraseMode();
		x = GetCurrentX();
		y = GetCurrentY();
		SetEraseMode(isDisplay);
		DrawTextString("_");
		MovePen(x, y);
		if(textlen-1!=location){
			char str[2]={0,0};
			str[0]=Text[location+1];
			SetEraseMode(FALSE);
			DrawTextString(str);
			MovePen(x,y);
		}
	      SetEraseMode(erasemode);
		  isDisplay = !isDisplay;
		  break;
	    default:
		  break;
	  }
}

void Main()
{
    InitGraphics();   
    SetLayout();
	registerMouseEvent(MouseEventProcess);
	registerKeyboardEvent(KeyboardEventProcess);
	registerCharEvent(CharEventProcess);
	registerTimerEvent(TimerEventProcess);
}