对话框方式，绘图超出界面范围,点击滚动条显示，不能显示超出范围且图乱了?

[vc8fans]

对话框方式，绘图超出界面范围,点击滚动条显示，不能显示超出范围且图乱了?
如果是文档模式就没有问题，， 是啥原因??

[grf9527]

建议先把话说清楚，把使用的类说清楚，把响应函数说清楚

[vc8fans]

另加的 滚动条 , 滚动时候，图形乱了，，，你不是在对话框绘图超过 对话框界面时候，，超过内存了？

[schlafenhamster]

.h int m_Sourcex, m_Sourcey; CScrollBar m_vBar; CScrollBar m_hBar;

//
void CScrollBitmapDlg::OnVScroll(UINT nSBCode,UINT nPos,CScrollBar *pScrollBar) 
{// TODO: Add your message handler code here and/or call default
// for focus not jumpping
	GetDlgItem(IDOK)->SetFocus();
// scrolling
	switch (nSBCode)
	{
	case SB_LINEUP:
	case SB_PAGEUP:
		if(m_Sourcey >=10) m_Sourcey -= 10;
		else			 m_Sourcey  = 0;
		break;
	case SB_LINEDOWN:
	case SB_PAGEDOWN:
		if((m_Sourcey+m_rcPicture.Height()+10)<m_bmInfo.bmHeight)
			m_Sourcey += 10;
		else
			m_Sourcey  = m_bmInfo.bmHeight -m_rcPicture.Height();
		break;
	case SB_TOP:
		m_Sourcey = 0;
		break;
	case SB_BOTTOM:
		m_Sourcey = INT_MAX;
		break;
	case SB_THUMBTRACK:
		m_Sourcey = nPos;
		break;
	default:
//		afxDump << nSBCode << "=SB_ENDSCROLL\n";
		break;
	}
	m_vBar.SetScrollPos(m_Sourcey);
	InvalidateRect(&m_rcPicture,FALSE);
//	CDialog::OnVScroll(nSBCode, nPos, pScrollBar);
}
//
void CScrollBitmapDlg::OnHScroll(UINT nSBCode,UINT nPos,CScrollBar *pScrollBar) 
{// TODO: Add your message handler code here and/or call default
// for focus not jumpping
	GetDlgItem(IDOK)->SetFocus();
// scrolling
	switch (nSBCode)
	{
	case SB_LINELEFT:
	case SB_PAGELEFT:
		if(m_Sourcex >=10) m_Sourcex -= 10;
		else			   m_Sourcex  = 0;
		break;
	case SB_LINERIGHT:
	case SB_PAGERIGHT:
		if((m_Sourcex+m_rcPicture.Width()+10)<m_bmInfo.bmWidth)
			m_Sourcex += 10;
		else
			m_Sourcex  = m_bmInfo.bmWidth -m_rcPicture.Width();
		break;
	case SB_TOP:
		m_Sourcex = 0;
		break;
	case SB_BOTTOM:
		m_Sourcex = INT_MAX;
		break;
	case SB_THUMBTRACK:
		m_Sourcex= nPos;
		break;
	default:
//		afxDump << nSBCode << "=SB_ENDSCROLL\n";
		break;
	}	
//
	m_hBar.SetScrollPos(m_Sourcex);
	InvalidateRect(&m_rcPicture,FALSE);
//	CDialog::OnHScroll(nSBCode, nPos, pScrollBar);
}

[schlafenhamster]

对话框 自带的 滚动条， 还是 另加的 滚动条 ？

[zgl7903]

绘制时 使用 GetScrollPos 获取起始坐标位置

[vc8fans]

试了，好像与滚动条没关系，找了一些例子好像都不行？？？问题到底在那里？？？？

[schlafenhamster]

m_Sourcex, m_Sourcey; 的使用

//Replace OnPaint()
void CScrollBitmapDlg::OnMyPaint(WPARAM wParam, LPARAM lParam)
{
	if (IsIconic())
	{
		CPaintDC dc(this);
		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);
		
		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;
		
		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{	
		if(wParam)
		{// paint to memDC
			CDC *pDC=CDC::FromHandle((HDC)wParam);
			pDC->BitBlt(m_rcPicture.left,m_rcPicture.top,m_rcPicture.Width(),
						m_rcPicture.Height(),&m_dcMem, m_Sourcex, m_Sourcey,SRCCOPY);
		}
		else
		{// typical way painting in dialog.
			CPaintDC dc(this);
			m_Pic.Invalidate(FALSE);// do not erase background!
			dc.BitBlt(m_rcPicture.left,m_rcPicture.top,m_rcPicture.Width(),
					  m_rcPicture.Height(),&m_dcMem, m_Sourcex, m_Sourcey,SRCCOPY);
// others
			CDialog::OnPaint();
		}
	}
}

[schlafenhamster]

ON_MESSAGE(WM_PAINT, OnMyPaint) afx_msg void OnMyPaint(WPARAM wParam, LPARAM lParam);

[xiaohuh421]

基类的onpaint函数不能随便省掉哟

[vc8fans]

谢谢各位，以上方法均不行，已经实验可行方法是，在对话框直接继承文档，视图 类， 其他方法肯定不行，