GDI+
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Hello, I have the following code in a win app: // create bitmap from file Bitmap myBitmap = new Bitmap(textBox1.Text); Graphics g = Graphics.FromImage(myBitmap); g.RotateTransform(30); //rotate 30 degrees // create a new bitmap from the Graphics object Bitmap next = new Bitmap(myBitmap.Width, myBitmap.Height, g); // save the new bitmap to disk next.Save("c:/documents and settings/vortex/Desktop/file.jpg"); When this code is executed, an empty image file with the right dimensions is stored - just a blank (white) image... I tried without rotating, but nothing happened either. I would appreciate if you could give me any hints about the problem. Thank you in advance. "Needless redundancy is the hobgoblin of software engineering." - Peter Darnell
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Hello, I have the following code in a win app: // create bitmap from file Bitmap myBitmap = new Bitmap(textBox1.Text); Graphics g = Graphics.FromImage(myBitmap); g.RotateTransform(30); //rotate 30 degrees // create a new bitmap from the Graphics object Bitmap next = new Bitmap(myBitmap.Width, myBitmap.Height, g); // save the new bitmap to disk next.Save("c:/documents and settings/vortex/Desktop/file.jpg"); When this code is executed, an empty image file with the right dimensions is stored - just a blank (white) image... I tried without rotating, but nothing happened either. I would appreciate if you could give me any hints about the problem. Thank you in advance. "Needless redundancy is the hobgoblin of software engineering." - Peter Darnell
The constructore you used for your second
Bitmapis wrong, its just use resolution of graphic object. You have to useBitmap.Clone()method to create copy of yourBitmap. Mazy "I think that only daring speculation can lead us further and not accumulation of facts." - Albert Einstein -
The constructore you used for your second
Bitmapis wrong, its just use resolution of graphic object. You have to useBitmap.Clone()method to create copy of yourBitmap. Mazy "I think that only daring speculation can lead us further and not accumulation of facts." - Albert EinsteinIt seems you understood the whole point wrongly... My intentions are to load a bitmap, manipulate it (e.g. Rotate it), and finally save it to another file... I thought the steps I described ( Bitmap->Graphics->Bitmap->file) could do it, but there was something wrong in that code. I strictly followed the MSDN documentation, but still I was unable to achieve this... "Needless redundancy is the hobgoblin of software engineering." - Peter Darnell
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Hello, I have the following code in a win app: // create bitmap from file Bitmap myBitmap = new Bitmap(textBox1.Text); Graphics g = Graphics.FromImage(myBitmap); g.RotateTransform(30); //rotate 30 degrees // create a new bitmap from the Graphics object Bitmap next = new Bitmap(myBitmap.Width, myBitmap.Height, g); // save the new bitmap to disk next.Save("c:/documents and settings/vortex/Desktop/file.jpg"); When this code is executed, an empty image file with the right dimensions is stored - just a blank (white) image... I tried without rotating, but nothing happened either. I would appreciate if you could give me any hints about the problem. Thank you in advance. "Needless redundancy is the hobgoblin of software engineering." - Peter Darnell
Vladimir Georgiev wrote: // create a new bitmap from the Graphics object Bitmap next = new Bitmap(myBitmap.Width, myBitmap.Height, g); Dont do that! Just save "myBitmap" top secret
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Vladimir Georgiev wrote: // create a new bitmap from the Graphics object Bitmap next = new Bitmap(myBitmap.Width, myBitmap.Height, g); Dont do that! Just save "myBitmap" top secret
Saving myBitmap does not save the rotated bitmap: // file is a 24-bit .bmp file Bitmap myBitmap = new Bitmap(textBox1.Text); Graphics g = Graphics.FromImage(myBitmap); g.RotateTransform(30); myBitmap.Save("c:/documents and settings/vortex/Desktop/file123.bmp"); My main purpose is to open a bitmap, get some pixels from it, calculate the rotation degree based on those pixels, rotate and save the bitmap. MSDN says that you could create a Graphics object from a bitmap, and vice-versa as well... But it does not work... Any help is highly appreciated. "Needless redundancy is the hobgoblin of software engineering." - Peter Darnell
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Saving myBitmap does not save the rotated bitmap: // file is a 24-bit .bmp file Bitmap myBitmap = new Bitmap(textBox1.Text); Graphics g = Graphics.FromImage(myBitmap); g.RotateTransform(30); myBitmap.Save("c:/documents and settings/vortex/Desktop/file123.bmp"); My main purpose is to open a bitmap, get some pixels from it, calculate the rotation degree based on those pixels, rotate and save the bitmap. MSDN says that you could create a Graphics object from a bitmap, and vice-versa as well... But it does not work... Any help is highly appreciated. "Needless redundancy is the hobgoblin of software engineering." - Peter Darnell
Vladimir Georgiev wrote: g.RotateTransform(30); I think you are reading the function wrong. This just adjusts your "perspective" from a drawing point of view. IOW anything drawn after that will be "tilted". Thats said do this:
Bitmap myBitmap = new Bitmap(textBox1.Text);
Bitmap newb = myBitmap.Clone() as Bitmap;
Graphics g = Graphics.FromImage(newb);
g.RotateTransform(30);
g.DrawImage(myBitmap);
newb.Save("c:/documents and settings/vortex/Desktop/file123.bmp");