What is the C# equivalent of Delphi's TCanvas CopyRect and Draw procedure?

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I'm trying to convert a very old Borland Delphi 3D spinning cube application into C# on .NET 3.5

I'm very amateur with GDI+ and cannot seem to find a proper C# implementation solution for Borland Delphi's Canvas CopyRect and Draw procedure.

C# code:

'DoubleBuffer' and 'BlankBuffer' are both of Bitmap class on a Windows.Form
...
this.graphics = this.CreateGraphics();

this.brush = new SolidBrush(Color.Black);

this.DoubleBuffer = new Bitmap(400, 400);
this.BlankBuffer = new Bitmap(400, 400);

//TO FIX
//this.BlankBuffer.Canvas.Draw(0, 0, BlankBuffer);

...and

//TO FIX
//DoubleBuffer.Canvas.CopyRect(new Rectangle(0,0,400,400),BlankBuffer.Canvas,new Rectangle(0,0,400,400));

// TO FIX
//frmCube.Canvas.CopyRect(new Rectangle(0, 0, 400, 400), DoubleBuffer.Canvas, new Rectangle(0, 0, 400, 400));

Posted 1-Sep-10 2:21am

JViljoen

Updated 1-Sep-10 2:30am

LittleYellowBird

v2

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

pierre poliakoff · Answer 1 · 2010-12-31T03:45:00

Hello,

I had the same problem a few months ago. I have found that
Graphics.Drawimage does work correctly to copy parts of an image at another place: example

MIDL

Graphics g = Graphics.FromImage(mazeImage);
mazeElements.SetResolution(g.DpiX, g.DpiY)
g.DrawImage(mazeElements, 32 * x, 32 * y, new Rectangle(item * 32, 0, 32, 32), GraphicsUnit.Pixel);

g.Dispose();

this will copy a rectangle from the bitmap "mazeElements" at the desired location in the bitmap "mazeImage"

WARNING: there are rounding errors that will possibly corrupt the results by putting the drawn image at a position shifted by one pixel if both bitmaps do not have the same Dpi. That's the reason for the line with "SetResolution"

I hope this helps

What is the C# equivalent of Delphi's TCanvas CopyRect and Draw procedure?

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What is the C# equivalent of Delphi's TCanvas CopyRect and Draw procedure?

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