ImageResizer - that supports maxWidth & MaxHeight -> mean keeping aspect Ratio

Question

I am looking for An ImageResizer Like below that supports MaxWidth & MaxHeight ...
where can i find it?
the below module does many other jobs that are not necessary for me.
just want to change format & support maxwidth and maxheight.

ImageResizer

Answer 1

You can write a wrapper that enforces the maximum width and maximum height, and maintains the aspect ratio.

For example, say you have an image that's 640 x 120 and your maximums are 1,920 x 1,440. Now, you want to make that image as large as possible, so you write:

ResizeImage(image, 1920, 1440)

If you were to do that, the aspect ratio would be shot.

You need to compute the aspect ratio of the existing image and adjust the values.

// Compute existing aspect ratio
double aspectRatio = (double)image.Width / image.Height;

// Clip the desired values to the maximums
desiredHeight = Math.Min(desiredHeight, MaxHeight);
desiredWidth = Math.Min(desiredWidth, MaxWidth);

// This is the aspect ratio if you used the desired values.
double newAspect = (double)desiredWidth / desiredHeight;

if (newAspect > aspectRatio)
{
    // The new aspect ratio would make the image too tall.
    // Need to adjust the height.
    desiredHeight = (int)(desiredWidth / aspectRatio);
}
else if (newAspect < aspectRatio)
{
    // The new aspect ratio would make the image too wide.
    // Need to adjust the width.
    desiredWidth = (int)(desiredHeight * aspectRatio);
}

// You can now resize the image using desiredWidth and desiredHeight

Answer 2

It doesn't matter if the library does more than what you need. If it does what you need it to, use it. The extra stuff isn't going to impair you at all.