attribute.cpp

1.通过鼠标拖拽和弹出对话框完成实体、属性、联系的绘制以及各参数设定 2.对绘制的实体、属性、联系提供合法性检查 3.对绘制的图形进行拖动、重设大小、删除 4.通过属性对话框对实体、属性、联系的

#include "stdafx.h"
#include "Attribute.h"
Attribute::Attribute(CString n,CString nt,Element* e,int f,int m,int x1,int y1,int x2,int y2,int c,int d)
{
	this->mainkey=m;
	this->selecting=0;
	this->name=n;
	this->father=e;
	this->flag=f;
	this->type=3;
	this->e1=*(new CPoint(x1,y1));
	this->e2=*(new CPoint(x2,y2));
	this->next=NULL;
	this->nextelement=NULL;
	this->nametype=nt;
	this->datelength=d;
	this->canempty=c;
	this->nextmain=NULL;
	if(nametype=="char"||nametype=="varchar")
	{
		CString s;
		s.Format("%d",datelength);
		nametype=nametype+"("+s+")";
	}
}
int Attribute::isDeleted()
{
		return 1;
}
void Attribute::paint(CDC& g)
{
	CPen pen0(PS_SOLID,2,RGB(255,0,0));
	CPen pen(PS_DOT,2,RGB(255,0,0));
	CPen pen1(PS_SOLID,1,RGB(0,0,0));
	CPen pen2(PS_DOT,1,RGB(0,0,0));
    g.MoveTo((e1.x+e2.x)/2,(e1.y+e2.y)/2);
	g.LineTo((this->father->e1.x+this->father->e2.x)/2,
		      (this->father->e1.y+this->father->e2.y)/2);
	if(this->selecting==1)
	{
		g.SelectObject(pen0);
	}
	if(this->flag==3)
	{
		g.SelectObject(pen2);
	}
	if(this->selecting==1&&this->flag==3)
	{
	    g.SelectObject(pen);
	}
	g.Ellipse(e1.x,e1.y,e2.x,e2.y);
	if(this->flag==2)
	{
		g.Ellipse(e1.x+5,e1.y+5,e2.x-5,e2.y-5);
	}
	if(mainkey==1&&flag==1&&this->father->type==1)
	{
		g.TextOut(e1.x+10,(e1.y+e2.y)/2-10,"*");
	}
	g.TextOut(e1.x+15,(e1.y+e2.y)/2-10,name);
	g.SelectObject(pen1);
	this->father->paint(g);
	pen.DeleteObject();
	pen0.DeleteObject();
	pen1.DeleteObject();
	pen2.DeleteObject();
}
void Attribute::Delete()
{
	this->father->removeAttribute(this);
}
void Attribute::serial(CArchive& ar)
{
	
}