paintbak.cpp

用Visual C++实现的绘制函数图像的程序。给定任意函数表达式

						return 0;
					}
					if(error!=0)
						return 0;
					//-------------------------------------------把所得的CString类型的partsumcs复制给char类型的数组partsumch
					strncpy(partsumch,(LPCTSTR)partsumcs,18);
					//-----------------------------                       
					/////////////////////////////////-----------------关键！重新构造expres数组																
					for(k=0;k<M;part[k]='\0',k++); //part数组重新清\0
					BYTE rb1,rb2;
					rb1=partsumch[0]=='1'&&partsumch[1]=='.'&&partsumch[2]=='#';
					rb2=partsumch[1]=='1'&&partsumch[2]=='.'&&partsumch[3]=='#';
					if(rb1||rb2||fabs(atof(partsumcs))>=1e14)
					{
						outrange=1;
						return 0;
					}
					for(rb1=j-length,k=0;partsumch[k]!='\0';rb1++,k++)//构造新的expres数组的前半部分
						expres[rb1]=partsumch[k];
					for(rb2=i+1;expresbak[rb2]!='\0';rb1++,rb2++)//构造新的expres数组的后半部分
						expres[rb1]=expresbak[rb2];
					expres[rb1]=0;
					strcpy(expresbak,expres);
					i=j-length+k-1;//调整i的位置，使之指向新的expres和旧的expres的接壤部分
					break;
				}
			}
		}
	}
	if(fabs(result=powerchge(expres,xl,flag))>100)//对结果过大的处理
		outrange=1;
	return result;
}

/////////////////////////////////////////////////////////////////////////////
// CPaint message handlers
void CPaint::OnPaint()
{
	CPaintDC dc(this); // device context for painting
    CWnd* pWnd=GetDlgItem(IDC_COLOR);    //获得静态文本控件的指针
	pWnd->UpdateWindow();
	CDC* pDC=pWnd->GetDC();             //获得文本控件相关的设备描述？
	CBrush drawBrush;                    //--------------
	drawBrush.CreateSolidBrush(color);
	pDC->SelectObject(drawBrush);
	CRect rcClient;
	pWnd->GetClientRect(rcClient);
	pDC->Rectangle(rcClient);           //填充静态文本控件的颜色
	ReleaseDC(pDC);
//-----------------------------
    CWnd* pEdit;  //获得EDIT控件的指针
	if(flag==1)
		pEdit=GetDlgItem(IDC_EXPRES);
	else
	if(flag==2)
		pEdit=GetDlgItem(IDC_X_EXPRES);
	else
	if(flag==3)
		pEdit=GetDlgItem(IDC_Y_EXPRES);
	else
	if(flag==4)
		pEdit=GetDlgItem(IDC_EXPRES2);
    pDC=pEdit->GetDC();
    char expres[M];
	if(flag==1)
		strncpy(expres,(LPCTSTR)this->m_expres,sizeof(expres));  //把CString变量COPY到expres[]里
	else
	if(flag==2)
		strncpy(expres,(LPCTSTR)this->m_xexpres,sizeof(expres));
	else
	if(flag==3)
		strncpy(expres,(LPCTSTR)this->m_yexpres,sizeof(expres));  //把CString变量COPY到expres[]里
	else
	if(flag==4)
		strncpy(expres,(LPCTSTR)this->m_pexpres,sizeof(expres));  //把CString变量COPY到expres[]里
    char *serch=expres;
	pDC->SelectStockObject(DEFAULT_GUI_FONT);          //选择与对话框默认字体一样的字体画字
	pDC->SetTextColor(texnew);
	for(BYTE i=0;*serch!='\0';serch++,i++)          //-------------------------
	{
		if(flag==1&&*serch=='x')
		{
			pDC->SetTextColor(RGB(255,128,0));
			pDC->TextOut(6*i+1,1,"x");
			pDC->SetTextColor(texnew);
		}        
		else
		if((flag==2||flag==3)&&*serch=='t')
		{
			pDC->SetTextColor(RGB(255,128,0));
			pDC->TextOut(6*i+1,1,"t");
			pDC->SetTextColor(texnew);
		}        
		else
		if(flag==4&&*serch=='r')
		{
			pDC->SetTextColor(RGB(255,128,0));
			pDC->TextOut(6*i+1,1,"r");
			pDC->SetTextColor(texnew);
		}        
		else
		if (*serch=='e')
		{
			pDC->SetTextColor(RGB(255,128,0));
			pDC->TextOut(6*i+1,1,"e");
			pDC->SetTextColor(texnew);
		}        
		else
		if (*serch=='p')
		{
			pDC->SetTextColor(RGB(255,128,0));
			pDC->TextOut(6*i+1,1,"p");
			pDC->SetTextColor(texnew);
		}        
		else
		if (*serch=='+')
		{
			pDC->TextOut(6*i+1,1,"+");
		}        
		else
        if (*serch=='-')
		{
			pDC->TextOut(6*i+1,1,"-");
		}        
		else
        if (*serch=='*')
		{
			pDC->TextOut(6*i+1,1,"*");
		}        
		else
        if (*serch=='/')
		{
			pDC->TextOut(6*i+1,1,"/");
		}        
		else
        if (*serch=='(')
		{
            pDC->TextOut(6*i+1,1,"(");
		}        
		else
		if (*serch=='^')
		{
            pDC->TextOut(6*i+1,1,"^");
		}        
		else
        if (*serch==')')
		{
            pDC->TextOut(6*i+1,1,")");
		}        
	    if (*serch=='^')
		{
            pDC->TextOut(6*i+1,1,"^");
		}        
		else
        if (*serch=='l'&&*(serch+1)=='n')
		{
            pDC->TextOut(6*i+1,1,"ln");
		}
		else
		if (*serch=='s'&&*(serch+1)=='i'&&*(serch+2)=='n'&&*(serch+3)!='h')
		{
            pDC->TextOut(6*i+1,1,"sin");
		}
		else
        if (*serch=='c'&&*(serch+1)=='o'&&*(serch+2)=='s'&&*(serch+3)!='h')
		{
            pDC->TextOut(6*i+1,1,"cos");
		}
		else
        if (*serch=='t'&&*(serch+1)=='a'&&*(serch+2)=='n'&&*(serch+3)!='h')
		{
            pDC->TextOut(6*i+1,1,"tan");
		}
		else
        if (*serch=='c'&&*(serch+1)=='t'&&*(serch+2)=='g')
        {		   					
			pDC->TextOut(6*i+1,1,"ctg");
		}
		else
        if (*serch=='f'&&*(serch+1)=='a'&&*(serch+2)=='b'&&*(serch+3)=='s')
		{
            pDC->TextOut(6*i+1,1,"fabs");
		}
		else
        if (*serch=='a'&&*(serch+1)=='s'&&*(serch+2)=='i'&&*(serch+3)=='n')
		{
            pDC->TextOut(6*i+1,1,"asin");
		}
		else
        if (*serch=='a'&&*(serch+1)=='c'&&*(serch+2)=='o'&&*(serch+3)=='s')
		{
            pDC->TextOut(6*i+1,1,"acos");
		}
		else
        if (*serch=='a'&&*(serch+1)=='t'&&*(serch+2)=='a'&&*(serch+3)=='n')
		{
            pDC->TextOut(6*i+1,1,"atan");
		}
		else
        if (*serch=='a'&&*(serch+1)=='c'&&*(serch+2)=='t'&&*(serch+3)=='g')
		{
            pDC->TextOut(6*i+1,1,"actg");
		}
		else
        if (*serch=='s'&&*(serch+1)=='i'&&*(serch+2)=='n'&&*(serch+3)=='h')
		{
            pDC->TextOut(6*i+1,1,"sinh");
		}
		else
        if (*serch=='c'&&*(serch+1)=='o'&&*(serch+2)=='s'&&*(serch+3)=='h')
		{
            pDC->TextOut(6*i+1,1,"cosh");
		}
		else
        if (*serch=='t'&&*(serch+1)=='a'&&*(serch+2)=='n'&&*(serch+3)=='h')
		{
            pDC->TextOut(6*i+1,1,"tanh");
		}
				
	}//---------------------------------检查用户输入的CString类m_expres里是否有关键字sin,cos等，有则替换为蓝色的字
    ReleaseDC(pDC);
}
void CPaint::OnButton1() 
{
	extern CMyPaintView* dcpoint;
	extern double zoom,multi;
	extern short bufferx,buffery;
	xs=ys=0;
	zoom=1.0;
	multi=1.0;	
	bufferx=GetSystemMetrics(SM_CXSCREEN)/2;
    buffery=GetSystemMetrics(SM_CYSCREEN)/2;
	dcpoint->OnUpdate(NULL,NULL,NULL);
}

BOOL CPaint::OnInitDialog() 
{
	CDialog::OnInitDialog();
	//////////////////////	
	// TODO: Add extra initialization here
	CWnd  *m_x=GetDlgItem(IDC_X_ST),
		  *m_y=GetDlgItem(IDC_Y_ST),
		  *m_f=GetDlgItem(IDC_F_ST),
		  *m_p=GetDlgItem(IDC_P_ST),
		  *m_xexpres=GetDlgItem(IDC_X_EXPRES),
		  *m_yexpres=GetDlgItem(IDC_Y_EXPRES),
		  *m_pexpres=GetDlgItem(IDC_EXPRES2),
		  *m_nexpres=GetDlgItem(IDC_EXPRES),
	      *m_paintok1=GetDlgItem(ID_PAINT_OK),
		  *m_paintok2=GetDlgItem(ID_PAINT_OK2),
		  *m_paintok3=GetDlgItem(ID_PAINT_OK3);
		  //////////////////////
	m_choices.InsertItem(0,"一般方程");
	m_choices.InsertItem(1,"参数方程");
	m_choices.InsertItem(2,"极坐标方程");////////
	m_x->ShowWindow(SW_HIDE);
	m_y->ShowWindow(SW_HIDE);
	m_f->ShowWindow(SW_SHOW);
	m_p->ShowWindow(SW_HIDE);
	m_xexpres->ShowWindow(SW_HIDE);
	m_yexpres->ShowWindow(SW_HIDE);
	m_nexpres->ShowWindow(SW_SHOW);
	m_pexpres->ShowWindow(SW_HIDE);
	m_paintok1->ShowWindow(SW_SHOW);
    m_paintok2->ShowWindow(SW_HIDE);
	m_paintok3->ShowWindow(SW_HIDE);
	color=myrand();
	m_pattern.AddString("实线");
	m_pattern.AddString("点线");
	m_pattern.SetItemData(0,0);
	m_pattern.SetItemData(1,1);
	m_pattern.SetCurSel(0);////////////////////////
	flag_modify=0;
	return TRUE;  // return TRUE unless you set the focus to a control
	              // EXCEPTION: OCX Property Pages should return FALSE
}

void CPaint::OnPaintOk() 
{
	extern CMainFrame* mainwnd;
	extern CMyPaintView* dcpoint;
	BYTE i;
	double yc;
	UpdateData();
	error=1;
	notice=0;
	if(m_line_weight<1)
		m_line_weight=1;
	else
	if(m_line_weight>10)
		m_line_weight=10;
	UpdateData(FALSE);
	for(i=0;i<M;part[i++]=0);
	if(flag_modify==0)
	{
		if( ( p1=(MY_LINE*)new (MY_LINE) )==NULL )
			goto END;
		if(line_count==0)
		{
			head=p2=p1;
			head->next=NULL;
		}	
		else
		{
			p2->next=p1;
			p2=p1;
			p2->next=NULL;				
		}
	}
	temp=head;
	if(m_a<m_b&&line_count<10)
	{
		if(m_choices.GetCurSel()==1)
			OnPaintOk2();
		else
		if(m_choices.GetCurSel()==2)
			OnPaintOk3();
		else
		{
			unsigned short n=0;
			for(double xc=m_a;xc<=m_b;xc+=0.05)
			{
				strncpy(expres,(LPCTSTR)m_expres,M);
				yc=-superchge(expres,xc,'x');
				if(error!=0)
				{
					BYTE reset=line_count;
					p2=head;
					while(reset>1)
					{
						p2=p2->next;
						reset--;
					}
					if(line_count==0)
						p2=head=NULL;
					else
						p2->next=NULL;
					if(flag_modify==0)
						delete(p1);					
					break;
				}
				if(outrange==1)
				{
					outrange=0;
					notice=1;
					continue;
				}
				if(flag_modify==1)
					while(select_line!=0)
					{
						temp=temp->next;
						select_line--;
					}
				else				
					temp=p1;	
				if(fabs(yc-(short)yc)>=0.5)//对舍入误差的处理,使图像平滑
				{
					if(yc>0)
						yc=(short)yc+1;
					else
						yc=(short)yc-1;
				}
				else
					yc=(short)yc;				
				temp->point[n].x=(int)xc;
				temp->point[n].y=(int)yc;
				temp->point[n].z=0;
				if(n>1)///////////////去处多余的点
				{
					CMpoint k1,k2;
					k1.x=temp->point[n].x-temp->point[n-1].x;
					k1.y=temp->point[n].y-temp->point[n-1].y;
					k1.z=temp->point[n].z-temp->point[n-1].z;
					k2.x=temp->point[n-1].x-temp->point[n-2].x;
					k2.y=temp->point[n-1].y-temp->point[n-2].y;
					k2.z=temp->point[n-1].z-temp->point[n-2].z;
					if(fabs((k1.x*k2.x+k1.y*k2.y+k1.z*k2.z)/sqrt( (k1.x*k1.x+k1.y*k1.y+k1.z*k1.z)*(k2.x*k2.x+k2.y*k2.y+k2.z*k2.z) )-1.0)<1e-6)
					{
						temp->point[n-1].x=temp->point[n].x;
						temp->point[n-1].y=temp->point[n].y;
						temp->point[n-1].z=0;
						n=n-1;
						n++;
					}
					else
						n++;
				}
				else
					n++;
			}
			if(error==0)
			{
				temp->n=n;
				temp->tag=0;
				temp->real_expres[0]=m_expres;
				temp->expres.Format("%s%s   定义域  【%.2f,%.2f】",".F(x)=",m_expres,m_a,m_b);
			}
		}
		if(error==0)
		{
			temp->m_a=m_a;
			temp->m_b=m_b;
			temp->color=color;
			temp->weight=m_line_weight;
			temp->tem_xs=temp->tem_ys=temp->tex_xs=temp->tex_ys=0;
			temp->style=m_pattern.GetCurSel();			
			color=myrand();
			UpdateData(FALSE);	
			OnPaint();
			dcpoint->OnUpdate(NULL,NULL,NULL);