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I try to draw a halo for text using GDI+
Here is my code:
C++
Bitmap *bm = new Bitmap(100, 40, PixelFormat32bppRGB);
GraphicsPath *pth = new GraphicsPath();
WCHAR text[]  = L"Text Halo";
RectF pnt(20,50,100,40);

pth->AddString(text,
wcslen(text),
new FontFamily(L"Verdana"),
FontStyleRegular,
40,
pnt,
StringFormat::GenericDefault());

Gdiplus::Graphics *graph = new Gdiplus::Graphics(bm);
Matrix *mx = new Matrix(1.0f/15,0,0,1.0f/15,-(1.0f/15),-(1.0f/15));

graph->SetSmoothingMode(SmoothingModeAntiAlias);
graph->GetTransform(mx);
graph->DrawPath(&Pen(Color::Yellow, 3),pth);
graph->FillPath(new SolidBrush(Color::Red),pth);

delete pth;
delete graph;

Gdiplus::Graphics *graph_fin = new Gdiplus::Graphics(backdc);

graph_fin->SetSmoothingMode(SmoothingModeAntiAlias);
graph_fin->SetInterpolationMode(InterpolationModeHighQualityBilinear);
graph_fin->DrawImage(bm,20,50,0,0,100,40,UnitPixel);

delete bm;
delete graph_fin;


But as a result there was painted black rectangle.

Where is the mistake? And what needs to be fixed?
Posted
Comments
The_Inventor 18-Jul-13 0:51am    
Your inputs and outputs don't match what you claim to be doing. I see that create and use 'bm' but not 'backdc'. And then maybe you delete your pointers too soon ...
What / Where is this -> PixelFormat32bppRGB, is it 'Black'?

1 solution

you are drawing some empty stuff.-> bug in coordinates

else you should split your drawing code to find the bug. Start with filling the output with a solid color.
 
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