PickBox.cs Constrain Proportions

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C#

custom-controls

Hi i have been working with this class

Simple Runtime Control Sizing and Dragging Class

I need to be able to constrain proportions i am using this as a image container by placing the image into the background of a panel ontop of another panel wich is the piece of paper to say.

What im having problems with is i need to be able to do is resize, move and rotate and i have sorted out all of thease problems.

now the one thing i need help with is constraining the proportions of the panel when i resize.

when a image is loaded into the background of the panel im getting the propotions fine with this code:

imageWidth = img_old.Width;
imageHeight = img_old.Height;

// Figure out the ratio 397, 561 the maximum size
double ratioX = (double)397 / (double)imageWidth;
double ratioY = (double)561 / (double)imageHeight;
    // use whichever multiplier is smaller
    double ratio = ratioX < ratioY ? ratioX : ratioY;

    // now we can get the new height and width
    int newHeight = Convert.ToInt32(imageHeight * ratio);
    int newWidth = Convert.ToInt32(imageWidth * ratio);
    panelimage.Width = newWidth;
    panelimage.Height = newHeight;

and setting the panel to the correct size with maximum width and height specified

does anyone no how i could go about this

Many Thanks

Robert Duller