MFC_9.25_闪屏及右端固定

最新推荐文章于 2021-03-08 17:23:09 发布

Angie_Drinking

最新推荐文章于 2021-03-08 17:23:09 发布

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分类专栏：实习文章标签： MFC

本文链接：https://blog.youkuaiyun.com/weixin_38593332/article/details/82838194

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这篇博客介绍了在MFC中如何实现闪屏及右侧元素固定的技巧。全局变量包括CDC指针和屏幕尺寸等，OnMouseWheel()函数处理滚轮事件，而KlineDraw()用于绘制K线图。通过这些方法，开发者可以创建更丰富的用户界面交互体验。

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全局变量

CDC* pDC;
CRect rect;
CDC MemDC; //首先定义一个显示设备对象
CBitmap MemBitmap;//定义一个位图对象
BITMAP bm;
int m_Wheel=100;
int px,py,pxf,pxy = 0;
int ScreenHeight,ScreenWidth;

int WNumber = 50;
int WNS = 30; //下张图和上张图开始的位置;

OnMouseWheel()

BOOL CKlineMiddleView::OnMouseWheel(UINT nFlags, short zDelta, CPoint pt)
{
	// TODO: 在此添加消息处理程序代码和/或调用默认
	m_Wheel -= zDelta* 0.01;
	if(m_Wheel >= 150) m_Wheel= 150;   //方块数量多
	else if(m_Wheel <=65) m_Wheel=65;   //数量少
	else 
	{
		WNumber = 50 + m_Wheel - 100 ;
		this -> KlineDraw ();
	}
	return CView::OnMouseWheel(nFlags, zDelta, pt);
}

KlineDraw()

void CKlineMiddleView::KlineDraw()
{
	pDC = GetWindowDC();
    pDC->GetClipBox(&rect);
	GetClientRect(&rect);
	pDC->FillSolidRect(rect, RGB(0,0,0));    //设背景为黑色
	ScreenHeight = rect.Height();
	ScreenWidth = rect.Width();
	CClientDoc* pDoc = (CClientDoc*)GetDocument(); //载入数据的结构体


	//建立一个与屏幕显示兼容的位图
	MemBitmap.DeleteObject(); 
    MemDC.DeleteDC();         //清除上一次位图
	MemDC.CreateCompatibleDC(NULL); 
	MemBitmap.CreateCompatibleBitmap(pDC,ScreenWidth,ScreenHeight); 
	CBitmap *pOldBit=MemDC.SelectObject(&MemBitmap); 
	MemDC.FillSolidRect(0,0,ScreenWidth,ScreenHeight,RGB(0,0,0)); 

	WNS = 100 - WNumber;
	if( WNS < 0)
		WNS = 0 ;
			
	float KWidth = (float)(ScreenWidth - 30)/WNumber;
	int CLine = ScreenHeight * 3/4;   //隐形基准轴
	
	for(int i = WNS ; i < 100 ; i++)
	{
		int maxOC = max(pDoc->m_DataKLine[i].KOpenPrice,pDoc->m_DataKLine[i].KClosePrice);
		int minOC = min(pDoc->m_DataKLine[i].KOpenPrice,pDoc->m_DataKLine[i].KClosePrice);
		int mainHigh = maxOC - minOC;
		int lineHigh = pDoc->m_DataKLine[i].KHighestPrice - pDoc->m_DataKLine[i].KLowestPrice;

		int xleftTop = KWidth*(i-WNS);
		int yleftTop = CLine - maxOC * ScreenHeight/1000;
		int xWidth = KWidth * 0.9;
		int yHeight = mainHigh * ScreenHeight/1000;

		if(pDoc->m_DataKLine[i].KOpenPrice > pDoc->m_DataKLine[i].KClosePrice)
		{
			MemDC.FillSolidRect(xleftTop,yleftTop,xWidth,yHeight,RGB(39,176,216));
			CPen PenBlue(PS_SOLID,1,RGB(39,176,216));
			CPen *oldPenx = MemDC.SelectObject(&PenBlue);
			MemDC.MoveTo( xleftTop + xWidth/2 , CLine - pDoc->m_DataKLine[i].KHighestPrice*ScreenHeight/1000);
		    MemDC.LineTo( xleftTop + xWidth/2 , CLine - pDoc->m_DataKLine[i].KLowestPrice*ScreenHeight/1000);

		}
		else if(pDoc->m_DataKLine[i].KOpenPrice < pDoc->m_DataKLine[i].KClosePrice)
		{
			CBrush br;
			CPen pen;
			pen.CreatePen(PS_SOLID,1,RGB(255,74,102));
			br.CreateStockObject(NULL_BRUSH);
			MemDC.SelectObject(&pen);
			MemDC.SelectObject(&br);
			MemDC.Rectangle(xleftTop,yleftTop,xleftTop+xWidth,yleftTop+yHeight);

			CPen PenRed(PS_SOLID,1,RGB(255,74,102));
			CPen *oldPenx = MemDC.SelectObject(&PenRed);

			MemDC.MoveTo( xleftTop + xWidth/2 , CLine - pDoc->m_DataKLine[i].KHighestPrice*ScreenHeight/1000);
		    MemDC.LineTo( xleftTop + xWidth/2 , yleftTop);
			MemDC.MoveTo( xleftTop + xWidth/2 , yleftTop+yHeight);
		    MemDC.LineTo( xleftTop + xWidth/2 , CLine - pDoc->m_DataKLine[i].KLowestPrice*ScreenHeight/1000);

		}
		else
		{
			int yleftTop = CLine - pDoc->m_DataKLine[i].KOpenPrice*ScreenHeight/1000;
			int yHeight = 1;
			MemDC.FillSolidRect(xleftTop,yleftTop,xWidth,yHeight,RGB(255,255,255));
			CPen PenWhite(PS_SOLID,1,RGB(255,255,255));
			CPen *oldPenx = MemDC.SelectObject(&PenWhite);
			MemDC.MoveTo( xleftTop + xWidth/2 , CLine - pDoc->m_DataKLine[i].KHighestPrice*ScreenHeight/1000);
		    MemDC.LineTo( xleftTop + xWidth/2 , CLine - pDoc->m_DataKLine[i].KLowestPrice*ScreenHeight/1000);
		}
	}
    
    pDC->BitBlt(0,0,ScreenWidth,ScreenHeight,&MemDC,0,0,SRCCOPY);
	pDC->BitBlt(0,0,ScreenWidth,ScreenHeight,&MemDC,0,0,SRCCOPY);
	pDC->BitBlt(0,0,ScreenWidth,ScreenHeight,&MemDC,0,0,SRCCOPY);
	pDC->BitBlt(0,0,ScreenWidth,ScreenHeight,&MemDC,0,0,SRCCOPY);
	pDC->BitBlt(0,0,ScreenWidth,ScreenHeight,&MemDC,0,0,SRCCOPY);
	//画五遍比画一遍闪屏问题可以缓解点

}