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Editorial Team
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Asked: 2026-05-15T04:44:03+00:00

I have an application in which end-users can size and position images in a

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I have an application in which end-users can size and position images in a designer. Since the spec calls for the image to be “stretched” to the containing control, the end user can end up with an awkwardly stretched image.

To help the user with image sizing I am thinking of implementing a smart resizer function which would allow the the user to easily fix the aspect ratio of the picture so that it no longer appears stretched.

The quick way to solve this is to actually provide two options: 1) scale from width 2) scale from height. The user chooses the method and the algorithm adjusts the size of the picture by using the original aspect ratio. For example: A picture is displayed as 200×200 on the designer but the original image is 1024×768 pixels. The user chooses “Smart Size from width” and the new size becomes ~200×150 since the original aspect ratio is ~1.333

That’s OK, but how could I make the algorithm smarter and not bother the user by asking which dimension the recalculation should be based on?

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1 Answer

  1. Editorial Team

    If I’m interpreting your spec correctly, you want a result that is no larger than the one the end-user laid out originally; you want one of the two dimensions to shrink, and the other to stay the same. In other words, the new size should fill the designer space in one direction while shortening the size in the other direction to retain the original aspect ratio.

    original_ratio = original_width / original_height
designer_ratio = designer_width / designer_height
if original_ratio > designer_ratio
    designer_height = designer_width / original_ratio
else
    designer_width = designer_height * original_ratio

    Often you’ll be working with integer coordinates, but the divisions to produce the ratios above need to be floating point. Here’s a rearrangement of the formula to be more integer friendly. Make sure your integers have the range to handle the maximum width*height.

    if original_width * designer_height > designer_width * original_height
    designer_height = (designer_width * original_height) / original_width
else
    designer_width = (designer_height * original_width) / original_height
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