Get the Exact Size of the Zoomed Image inside the Picturebox

Question

I'm using WinForms. In my Form i have a picturebox. It's sizemode is set to Zoom. If i load an image into the picturebox the image will zoom according to the picturebox dimensions.

I wanted to know how I can get the size of the zoomed image inside the picturebox.

These are some of the things i tried, but this doesn't give me the result i wanted.

    private void Debug_Write_Click(object sender, EventArgs e)
    {
        //var pictureWidth = pictureBox1.ClientSize.Width; //This gives the size of the picturebox
        //var picturewidth1 = pictureBox1.Image.Width; This gives the actual size of the image


        //var pictureHight = pictureBox1.ClientSize.Height; //This gives the size of the picturebox
        //var pictureHight1 = pictureBox1.ClientSize.Height; This gives the actual size of the image

        Debug.WriteLine("Width: " + pictureWidth.ToString() + " Height: " + pictureHight.ToString());
    }

Example: Actual Size of image

Picturebox size mode is set to Zoom, so it zoomed the image depending on my picturebox size:

How do i find out the zoomed length and width of this image?

Answer 1

You should do the math!

Image img = //...;
PictureBox pb = //...;

var wfactor = (double)img.Width / pb.ClientSize.Width;
var hfactor = (double)img.Height / pb.ClientSize.Height;

var resizeFactor = Math.Max(wfactor, hfactor);
var imageSize = new Size((int)(img.Width / resizeFactor), (int)(img.Height / resizeFactor));