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//函數(shù)實現(xiàn)畫單根K線的功能,坐標(biāo)為普通坐標(biāo),而非對數(shù)坐標(biāo)
void CStockGraph::DrawOneKLine(CDC * pDC, int nIndexPos, int nIndexKD, CKData * pKData, double dMin, double dMax, BOOL bGreyed )
{
DECLARE_COLOR_DEFINATION
// Check Valid
//判斷當(dāng)前位置的序列號是否有效,指的是顯示窗口,在當(dāng)前的m_nIndexStart 和 m_nIndexEnd之間
ASSERT( pDC && nIndexPos >= m_nIndexStart && nIndexPos <= m_nIndexEnd && nIndexPos >= 0 );
if( !(pDC && nIndexPos >= m_nIndexStart && nIndexPos <= m_nIndexEnd && nIndexPos >= 0) )
return;
//判斷當(dāng)前位置的序列號是否有效,序列號是否是小于零或大于當(dāng)前序列的長度
if( !pKData || nIndexKD < 0 || nIndexKD >= pKData->GetSize() )
return;
if( dMax-dMin < 1e-4 )
return;
// Get Region
//關(guān)于GetOneKLineRect請參看下面關(guān)于這個函數(shù)的分析
//這里需要注意的一個問題就是rectK, rcEntity,是有不同的含義的,rectK是指顯示的K線矩形區(qū)域,實際的畫K線的區(qū)域是rcEntity,指的是畫K線實體的區(qū)域
CRect rectK, rcEntity;
long xMedium = 0;
if( !GetOneKLineRect( nIndexPos, &rectK, &rcEntity.left, &rcEntity.right, &xMedium ) )//參數(shù)xMedium 為K線實體的中間位置,對應(yīng)畫K線的圖形
return;
int xStart = rectK.left;
int xEnd = rectK.right;
ASSERT( xEnd <= m_rectKLineCenter.right );
if( xEnd > m_rectKLineCenter.right )
return;
KDATA kd = pKData->ElementAt(nIndexKD);
//根據(jù)當(dāng)前最低價格/最高價格/收盤價格/開盤價格的計算出K線實體在當(dāng)前顯示區(qū)域中坐標(biāo).(等比例的計算)
// Set rcEntity's top and bottom, set yLow, yHigh
int yLow = int( m_rectKLineCenter.bottom - m_rectKLineCenter.Height() * (kd.m_fLow - dMin) / (dMax-dMin) );
int yHigh = int( m_rectKLineCenter.bottom - m_rectKLineCenter.Height() * (kd.m_fHigh - dMin) / (dMax-dMin) );
int yOpen = int( m_rectKLineCenter.bottom - m_rectKLineCenter.Height() * (kd.m_fOpen - dMin) / (dMax-dMin) );
int yClose = int( m_rectKLineCenter.bottom - m_rectKLineCenter.Height() * (kd.m_fClose - dMin) / (dMax-dMin) );
//計算出實體區(qū)域的上下坐標(biāo),左右坐標(biāo)已經(jīng)根據(jù)序列位置計算出來了,到這個地方,已經(jīng)計算出了要畫K線的試題區(qū)域的具體坐標(biāo)了.
rcEntity.top = min( yOpen, yClose );
rcEntity.bottom = max( yOpen, yClose ) + 1;
//上面已經(jīng)計算出了要畫的K線的坐標(biāo)了,下面就開始畫K線了
if( CStockGraph::klineCandle == m_nCurKLineMode )
{
// Draw Entity
//畫實體區(qū)域了
COLORREF clr = clrRise;
if( kd.m_fClose < kd.m_fOpen )
clr = clrFallEntity;
if( kd.m_date > m_dwLatestDate )
clr = clrNewKLine;
if( bGreyed )
clr = clrDJ;
pDC->SetBkColor( clrBK );
if( kd.m_fClose < kd.m_fOpen )
pDC->FillSolidRect( &rcEntity, clr );
else
pDC->Draw3dRect( &rcEntity, clr, clr );
// Draw Line
//畫K線上的最高和最低價格的線
CPen pen( PS_SOLID, 1, clr );
CPen *pOldPen = pDC->SelectObject( &pen );
pDC->MoveTo( xMedium, yHigh );
pDC->LineTo( xMedium, rcEntity.top );
pDC->MoveTo( xMedium, rcEntity.bottom );
pDC->LineTo( xMedium, yLow );
pDC->SelectObject( pOldPen );
}
else if( CStockGraph::klineAmerica == m_nCurKLineMode )
{
// Draw Entity
COLORREF clr = clrRise;
if( kd.m_date > m_dwLatestDate )
clr = clrNewKLine;
if( bGreyed )
clr = clrDJ;
pDC->SetBkColor( clrBK );
// Draw Line
CPen pen( PS_SOLID, 1, clr );
CPen *pOldPen = pDC->SelectObject( &pen );
pDC->MoveTo( xStart, yHigh );
pDC->LineTo( xStart, yLow );
pDC->MoveTo( xStart, yClose );
pDC->LineTo( xEnd, yClose );
pDC->SelectObject( pOldPen );
}
else if( CStockGraph::klineTower == m_nCurKLineMode )
{
// Draw Entity
COLORREF clr = clrRise;
if( kd.m_fClose < kd.m_fOpen )
clr = clrFallEntity;
if( kd.m_date > m_dwLatestDate )
clr = clrNewKLine;
if( bGreyed )
clr = clrDJ;
pDC->SetBkColor( clrBK );
if( kd.m_fClose < kd.m_fOpen )
pDC->FillSolidRect( &rcEntity, clr );
else
pDC->Draw3dRect( &rcEntity, clr, clr );
if( nIndexKD > 0 )
{
KDATA kdLast = pKData->ElementAt(nIndexKD-1);
int yOpenLast = int( m_rectKLineCenter.bottom - m_rectKLineCenter.Height() * (kdLast.m_fOpen - dMin) / (dMax-dMin) );
int yCloseLast = int( m_rectKLineCenter.bottom - m_rectKLineCenter.Height() * (kdLast.m_fClose - dMin) / (dMax-dMin) );
if( kdLast.m_fClose > kdLast.m_fOpen && kd.m_fClose < kd.m_fOpen )
{
rcEntity.bottom = min(yOpenLast,rcEntity.bottom);
if( rcEntity.bottom > rcEntity.top )
{
pDC->FillSolidRect( &rcEntity, clrBK );
clr = clrRise;
if( kd.m_date > m_dwLatestDate )
clr = clrNewKLine;
if( bGreyed )
clr = clrDJ;
pDC->Draw3dRect( &rcEntity, clr, clr );
}
}
else if( kdLast.m_fClose < kdLast.m_fOpen && kd.m_fClose > kd.m_fOpen )
{
rcEntity.top = max(yOpenLast,rcEntity.top);
if( rcEntity.bottom > rcEntity.top )
{
clr = clrFallEntity;
if( kd.m_date > m_dwLatestDate )
clr = clrNewKLine;
if( bGreyed )
clr = clrDJ;
pDC->FillSolidRect( &rcEntity, clr );
}
}
}
}
}
//函數(shù)GetOneKLineRect的分析,得到當(dāng)前序列位置處要畫K線的區(qū)域
BOOL CStockGraph::GetOneKLineRect( int nIndex, LPRECT lpRect, long *pxEntityLeft, long *pxEntityRight, long *pxMedium )
{
//判斷當(dāng)前的序列位置是在當(dāng)前顯示的窗口區(qū)域中
if( nIndex == -1 || nIndex < m_nIndexStart || nIndex > m_nIndexEnd )
return FALSE;
//初始化畫K線的位置的矩形區(qū)域
CRect rectK = m_rectCenter;
//計算出K線位置的左右寬度的坐標(biāo),上下的坐標(biāo)沒有給出,只是初始化為m_rectCenter中的參數(shù)
//左邊的起誓位置為,從K線顯示區(qū)域的左邊開始m_rectKLineCenter.left,加上已經(jīng)顯示了nIndex-m_nIndexStart點的距離就是當(dāng)前序列處的坐標(biāo)
rectK.left = m_rectKLineCenter.left + (nIndex-m_nIndexStart) * m_nThickness;
//右邊的坐標(biāo)最簡單,就是左邊左邊加上寬度就可以了.
rectK.right = rectK.left + m_nThickness;
if( rectK.Width() <= 0 || rectK.Height() <= 0 )
return FALSE;
//傳出參數(shù)lpRect
if( lpRect )
*lpRect = rectK;
int xStart = rectK.left;
CRect rcEntity;
//根據(jù)當(dāng)前的K線的寬度計算出序列的右邊的坐標(biāo)點,并傳出參數(shù)
switch( m_nThickness )
{
case 1:
case 2:
rcEntity.left = xStart;
rcEntity.right = xStart + 1;
break;
case 4:
case 5:
rcEntity.left = xStart;
rcEntity.right = xStart + 3;
break;
case 6:
case 7:
rcEntity.left = xStart;
rcEntity.right = xStart + 5;
break;
case 9:
case 10:
rcEntity.left = xStart;
rcEntity.right = xStart + 7;
break;
case 13:
case 15:
rcEntity.left = xStart;
rcEntity.right = xStart + 11;
break;
default:
ASSERT( FALSE );
rcEntity.left = xStart;
rcEntity.right = xStart + 3;
return FALSE;
}
if( pxEntityLeft )
*pxEntityLeft = rcEntity.left;
if( pxEntityRight )
*pxEntityRight = rcEntity.right;
if( pxMedium )
*pxMedium = rcEntity.left + rcEntity.Width() / 2;
return TRUE;
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