http://osgeo-org.1803224.n2.nabble.com/file/n7175677/Image.cpp Image.cpp
Ari,
void CViewMain::OnDraw()
{
....
if (m_image.IsOpen())
{
m_image.Draw(hdcMem,m_image.m_XOff,m_image.m_YOff,m_image.m_imgWidth,m_image.m_imgHeight,
m_image.m_xSrc,m_image.m_ySrc,m_image.m_srcWidth,m_image.m_srcHeight,
1,1,1);
}
....
}
void CViewMain::OnGdalOpen()
{
LPCTSTR szFilter = _T("Windows bitmap(*.bmp)|*.bmp|All Files
(*.*)|*.*||");
CString filePath(_T(""));
CFileDialog fileOpenDlg(TRUE, _T("bmp"),
NULL,OFN_HIDEREADONLY,szFilter);
if (fileOpenDlg.DoModal() == IDOK)
{
VERIFY(filePath = fileOpenDlg.GetPathName());
}
const char* pszFilename = CStringToCharUTF8(filePath);
m_image.Open(filePath);
}
void CGDALImage::Draw(CDC *pDC, long xOff, long yOff, long width, long
height, long xSrc, long ySrc, long srcWidth, long srcHeight, long rband,
long gband, long bband)
{
if(pDC==NULL)
return;
if (!m_pDataset)
return;
if(m_DC.m_hDC>0)
m_DC.Detach();
m_DC.Attach(pDC->m_hDC);
m_hdc=pDC->m_hDC;
if (rband == 0 || rband>m_bandNum)
rband = m_CurrentBand;
if (gband == 0 || gband>m_bandNum)
gband = m_CurrentBand;
if (bband == 0 || bband>m_bandNum)
bband = m_CurrentBand;
m_red=rband;
m_green=gband;
m_blue=bband;
if(xSrc<0 ||xSrc >m_imgWidth) xSrc=0;
if(ySrc<0 ||ySrc >m_imgHeight) ySrc=0;
if(srcWidth<1 || srcWidth > m_imgWidth) srcWidth=m_imgWidth;
if(srcHeight<1 || srcHeight > m_imgHeight) srcHeight=m_imgHeight;
m_XOff=xSrc;//¶БИлµЅДЪґжµДУ°ПсЖрКјО»ЦГ
m_YOff=ySrc;
m_buffWidth=srcWidth;//»єґжµДёЯ¶ИЈ¬їн¶И
m_buffHeight=srcHeight;
if(double(width)/
double(height)>double(srcWidth)/double(srcHeight))//±ЈЦ¤і¤їнІ»»ы±д
{
double tmp=height*double(srcWidth)/double(srcHeight);
width=tmp-long(tmp)>0.5?long(tmp)+1:long(tmp);
}
else
{
double tmp=width*double(srcHeight)/double(srcWidth);
height=tmp-long(tmp)>0.5?long(tmp)+1:long(tmp);
}
m_WndWidth=width;
m_WnDHeight=height;
m_WndXOff=xOff;
m_WndYOff=yOff;
m_xSrc=xSrc;
m_ySrc=ySrc;
m_srcWidth=srcWidth;
m_srcHeight= srcHeight;
//byte* buf = new byte[srcWidth*srcHeight];
int dataType=0;
if(m_DataType=="Byte")dataType=0;
if(m_DataType=="UInt16")dataType=1;
if(m_DataType=="Int16")dataType=2;
if(m_DataType=="UInt32")dataType=3;
if(m_DataType=="Int32")dataType=4;
if(m_DataType=="Float32")dataType=5;
if(m_DataType=="Float64")dataType=6;
if(m_DataType=="CInt16")dataType=7;
if(m_DataType=="CInt32")dataType=8;
if(m_DataType=="CFloat32")dataType=9;
if(m_DataType=="CFloat64")dataType=10;
GDALRasterBand *m_pBand=NULL;
byte* m_ByteBuff;
float* m_FloatBuff;
byte* buf =NULL;
float* buffFloat=NULL;
int x,y;
CDC dcMem;
dcMem.CreateCompatibleDC(pDC);
CBitmap bitmap;
bitmap.CreateCompatibleBitmap(pDC,width,height);
dcMem.SelectObject(&bitmap);
int i;
switch(dataType)
{
case 0://byteѕНbyte
m_ByteBuff = new byte[width*height*3];
m_buffHeight=height;
m_buffWidth=width;
m_buffSize=height*width*3;
buf = new byte[width*height];
m_pBand = m_pDataset->GetRasterBand(rband);
if (m_pBand)
{
if (CE_None==m_pBand->RasterIO( GF_Read, xSrc,ySrc,
srcWidth, srcHeight, buf, width,height, GDT_Byte, 0, 0 ))
{
for ( i = 0; i < width*height; i ++)
m_ByteBuff[3*i+2] = buf[i];
}
}
m_pBand = m_pDataset->GetRasterBand(gband);
if (m_pBand)
{
if (CE_None==m_pBand->RasterIO( GF_Read, xSrc,ySrc,
srcWidth, srcHeight, buf, width,height, GDT_Byte, 0, 0 ))
{
for ( i = 0; i <width*height; i ++)
m_ByteBuff[3*i+1] = buf[i];
}
}
m_pBand = m_pDataset->GetRasterBand(bband);
if (m_pBand)
{
if (CE_None==m_pBand->RasterIO( GF_Read, xSrc,ySrc,
srcWidth, srcHeight, buf, width,height, GDT_Byte, 0, 0 ))
{
for ( i = 0; i < width*height; i ++)
m_ByteBuff[3*i+0] = buf[i];
}
}
for ( x = 0; x < width; x ++)
{
for ( y = 0; y < height; y ++)
{
dcMem.SetPixel(x,y,RGB(m_ByteBuff[(y*width+x)*3+2],m_ByteBuff[(y*width+x)*3+1],m_ByteBuff[(y*width+x)*3+0]));
}
}
pDC->BitBlt(xOff,yOff,width,height,&dcMem,0,0,SRCCOPY);
delete buf;
delete m_ByteBuff;
m_ByteBuff=NULL;
buf=NULL;
break;
default://ЖдЛыАаРНµД¶јУГfloat
m_FloatBuff = new float[width*height*3];
m_buffHeight=height;
m_buffWidth=width;
m_buffSize=height*width*3;
buffFloat = new float[width*height];
m_pBand = m_pDataset->GetRasterBand(rband);
if (m_pBand)
{
if (CE_None==m_pBand->RasterIO( GF_Read, xSrc,ySrc,
srcWidth, srcHeight, buffFloat, width,height, GDT_Float32, 0, 0 ))
{
for ( i = 0; i <width*height; i ++)
m_FloatBuff[3*i+2] = buffFloat[i];
}
}
m_pBand = m_pDataset->GetRasterBand(gband);
if (m_pBand)
{
if (CE_None==m_pBand->RasterIO( GF_Read, xSrc,ySrc,
srcWidth, srcHeight, buffFloat, width,height, GDT_Float32, 0, 0 ))
{
for ( i = 0; i <width*height; i ++)
m_FloatBuff[3*i+1] = buffFloat[i];
}
}
m_pBand = m_pDataset->GetRasterBand(bband);
if (m_pBand)
{
if (CE_None==m_pBand->RasterIO( GF_Read, xSrc,ySrc,
srcWidth, srcHeight, buffFloat, width,height, GDT_Float32, 0, 0 ))
{
for ( i = 0; i < width*height; i ++)
m_FloatBuff[3*i+0] = buffFloat[i];
}
}
for ( x = 0; x < width; x ++)
{
for ( y = 0; y < height; y ++)
{
dcMem.SetPixel(x,y,RGB(m_FloatBuff[(y*width+x)*3+2],m_FloatBuff[(y*width+x)*3+1],m_FloatBuff[(y*width+x)*3+0]));
}
}
pDC->BitBlt(xOff,yOff,width,height,&dcMem,0,0,SRCCOPY);
delete buffFloat;
delete m_FloatBuff;
m_FloatBuff=NULL;
buffFloat=NULL;
break;
}
}
For imagesc with bands >= 3 the OnDraw function works fine:
m_image.Draw(hdcMem,m_image.m_XOff,m_image.m_YOff,m_image.m_imgWidth,m_image.m_imgHeight,
m_image.m_xSrc,m_image.m_ySrc,m_image.m_srcWidth,m_image.m_srcHeight,
1,2,3);
Best Regards
--
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