Simplified Image Processing in GDI+ - Sample Four-Flipping an Image
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Are you familiar with Windows' paintbrush application? It provides support for flipping a specified image 90 degrees or 180 degrees. GDI+'s RotateFlip() function will easily help you to achieve the above and even more effects. Here's the signature for the RotateFlip() function:
public void RotateFlip(RotateFlipType rotateFlipType);
As you may guess, all the secrets hide behind the RotateFlipType parameter. The following table lists all the enumeration values of this parameter, through which you can see the typical flipping support accomplished in any good image processing software.
Member name | Description |
RotateNoneFlipNone | Specifies no rotation and no flipping. |
Rotate90FlipNone | Specifies a 90-degree rotation without flipping. |
Rotate180FlipNone | Specifies a 180-degree rotation without flipping. |
Rotate270FlipNone | Specifies a 270-degree rotation without flipping. |
RotateNoneFlipX | Specifies no rotation followed by a horizontal flip. |
Rotate90FlipX | Specifies a 90-degree rotation followed by a horizontal flip. |
Rotate180FlipX | Specifies a 180-degree rotation followed by a horizontal flip. |
Rotate270FlipX | Specifies a 270-degree rotation followed by a horizontal flip. |
RotateNoneFlipY | Specifies no rotation followed by a vertical flip. |
Rotate90FlipY | Specifies a 90-degree rotation followed by a vertical flip. |
Rotate180FlipY | Specifies a 180-degree rotation followed by a vertical flip. |
Rotate270FlipY | Specifies a 270-degree rotation followed by a vertical flip. |
RotateNoneFlipXY | Specifies no rotation followed by a horizontal and vertical flip. |
Rotate90FlipXY | Specifies a 90-degree rotation followed by a horizontal and vertical flip. |
Rotate180FlipXY | Specifies a 180-degree rotation followed by a horizontal and vertical flip. |
Rotate270FlipXY | Specifies a 270-degree rotation followed by a horizontal and vertical flip. |
For simplicity, we only construct a sample using the constant RotateNoneFlipX. Figure 4 shows the running-time result of this related sample application.
Figure 4 - the running-time snapshot for sample 4
The following code is already accompanied by enough comments to explain the usage of the RotateFlip() function and the constant RotateNoneFlipX:
private void RotateFlip_Click(object sender, System.EventArgs e)
{
Graphics graphics=this.CreateGraphics();
graphics.Clear(Color.White);
//load the image
Bitmap photo=new Bitmap("nemo2.bmp");
//get the size of the image
int iWidth = photo.Width;
int iHeight = photo.Height;
//render the source image
graphics.DrawImage(photo, 10+photo.Width+2,
10, photo.Width, photo.Height);
//flip the image in horizontal direction
photo.RotateFlip(RotateFlipType.RotateNoneFlipX);
//render the rotated image
graphics.DrawImage( photo, 10, 10, photo.Width, photo.Height);
}
In the next article, our first sample will look at another usage of the DrawImage() function to achieve the reflecting and skewing effect for a given image. You won't want to miss it!
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