Develop Reference

How to find the position of an Image in WPF C#?

I have an array which stores many images within in. I am trying to figure out how to get the position of the image (x,y) within the window. I aim to put it in a timer so I can get the updated location as the program runs.
The images are added with the following code:
arrayName[p] = new Image();
arrayName[p].Source = new BitmapImage(new Uri(#"imgPlaneSprite.png", UriKind.Relative));
arrayName[p].Width = 50;
arrayName[p].Height = 50;
arrayName[p].Stretch = Stretch.Fill;
LayoutRoot.Children.Add(arrayName[p]);

try this:
arrayName[p].PointToScreen(new Point(0, 0));

C# WPF rendering true monochromatic image from ink canvas

I am loading an image into an ink canvas, the input image is always monochromatic, I am then drawing on that image with a white pen and intending to save it.
When the image is loaded some of the pre-existing lines which I know to be 1 pixel thick have an edge added to them which isn't monochromatic.
The way I have though to fix this is by rendering the bitmap and then discarding all pixels with a value of less than 255.
I have tried to use the pixel format BlackWhite, however this generates the error:
An unhandled exception of type 'System.ArgumentException' occurred in PresentationCore.dll
Additional information: 'BlackWhite' PixelFormat is not supported for this operation.
The line of code rendering the bitmap
RenderTargetBitmap rtb = new RenderTargetBitmap((int)inkCanvas.ActualWidth, (int)inkCanvas.ActualHeight, 96, 96, System.Windows.Media.PixelFormats.BlackWhite);
I'm not sure if the issue lies in how I loaded it into the ink canvas so that code is also included below
private void LoadImagetoCanvas(object sender, RoutedEventArgs e)
{
Microsoft.Win32.OpenFileDialog openFileDlg = new Microsoft.Win32.OpenFileDialog();
Nullable<bool> result = openFileDlg.ShowDialog();
if (result == true)
{
global.canvas1filepath = openFileDlg.FileName;
System.Windows.Controls.Image myImage = new System.Windows.Controls.Image();
myImage.Source = new BitmapImage(new Uri(global.canvas1filepath));
BitmapImage bmp = new BitmapImage(new Uri(global.canvas1filepath, UriKind.Absolute));
global.canvas1imagexpixels = (int)bmp.Width;
global.canvas1imageypixels = (int)bmp.Height;
ImageBrush canvas1Background = new ImageBrush();
canvas1Background.ImageSource = new BitmapImage(new Uri(global.canvas1filepath, UriKind.Relative));
inkCanvas1.Background = canvas1Background;
}
}

I'll compile an answer here - thanks to Sinatr & Clemens for their help with the theory and examples
The solution is based in the XMAL code for the ink canvas i'm using, I found adding the two following properties removed any edges to the 1 pixel wide lines I was drawing:
RenderOptions.BitmapScalingMode="NearestNeighbor" RenderOptions.EdgeMode="Aliased"

How to save the painted control as a bitmap?

I have a picturebox (pictureBox1), and it gets lines drawn on it, from the paint event. I was wondering how to convert that drawing (with the lines) to a bitmap, and save it as a file. I've tried:
Bitmap bmp = new Bitmap(pictureBox1.Width, pictureBox.Height);
pictureBox1.DrawToBitmap(bmp, pictureBox1.Bounds);
bmp.Save("MyImage.bmp");
But that is a blank image, without the lines. Does anyone know how I can save it with the lines? Thank you.

int bitmapX = 100
int bitmapY = 100
Bitmap imgToSave = new Bitmap(bitmapX, bitmapY);
Graphics gfx = Graphics.FromImage(imgToSave);
// draw on the image with
gfx.DrawLine() // or whatever you want to draw
// save the screenshot
string saveFilePath = Application.StartupPath + "\<name of the image>.png";
imgToSave.Save(saveFilePath, ImageFormat.Png);
This is a code snippet that works for me.

Don't use the PictureBox.Bounds property but instead use a simple Rectangle object/structure filled with the `PictureBox' width and height like this:
var bitmap = new Bitmap(pictureBox1.Width, pictureBox1.Height);
pictureBox1.DrawToBitmap(bitmap, new Rectangle(0, 0, pictureBox1.Width, pictureBox1.Height));
bitmap.Save("c:\\temp\\image.bmp");
Using the Bounds property you are fetching the correct size of the picture box control, but depending on the position not the 0,0 coordinate, but the control position, which leads to an empty bitmap.

Set image coordinates programmatically

Rather than declaring an image and setting the source from the xaml file, can someone do the initialization part, set the image coordinates, and set the source completely in the code?

// Create Image Element
Image myImage = new Image();
myImage.Width = 200;
// Create source
BitmapImage myBitmapImage = new BitmapImage();
// BitmapImage.UriSource must be in a BeginInit/EndInit block
myBitmapImage.BeginInit();
myBitmapImage.UriSource = new Uri(#"C:\Documents and Settings\All Users\Documents\My Pictures\Sample Pictures\Water Lilies.jpg");
// To save significant application memory, set the DecodePixelWidth or
// DecodePixelHeight of the BitmapImage value of the image source to the desired
// height or width of the rendered image. If you don't do this, the application will
// cache the image as though it were rendered as its normal size rather then just
// the size that is displayed.
// Note: In order to preserve aspect ratio, set DecodePixelWidth
// or DecodePixelHeight but not both.
myBitmapImage.DecodePixelWidth = 200;
myBitmapImage.EndInit();
//set image source
myImage.Source = myBitmapImage;

You need to create a new Image specifying the source:
Image myImage = new Image();
BitmapImage bitmapImage = new BitmapImage(new Uri("/YourSource", UriKind.Relative)); //Or UriKind.Absolute depending in the path
myImage.Source = bitmapImage;
If you want to place the image into some coordenates you can place a Canvas behind and place the image using Canvas coordenates. Use:
_myCanvas.Children.Add(myImage); //To add your image to Canvas, declared on Xaml or previously created and added to your control
Canvas.SetTop(myImage, 100); //Set Y coordenate relative to Canvas initial point
Canvas.SetLeft(myImage, 100); // Set X

Adding transparent Gif images to list view in c#

I am trying to add a transparent Gif image to list view, I used the following code snippet
to add gif image.
// control as ListView
void AddGiftoListView(Control parent)
{
Bitmap img = (Bitmap)Properties.Resources.madLoader; // Transparent gif image
Size sz = img.Size;
PictureBox pbGif = new PictureBox();
pbGif.Size = img.Size;
pbGif.Image = img;
parent.Controls.Add(pbGif);
Point p = new Point(1, 1);
pbGif.Location = p;
pbGif.Show();
}
But the gif is not transparent, when the list view filled with text, we can see gif on top of that with white background. is there any way ro resolve this issue?
Thanks,
Shiju P K

Try making your form's TransparencyKey as white
this.TransparencyKey = Color.White;