Resize image while keeping aspect ratio in Java

Question

im trying to resize bufferdImage in memory in java but to keep the aspect ratio of the image im have something like this but this is not good

int w = pictu         


        

Answer 1

For starters - take a look at line 2. Shouldnt that be getHeight()?

You dont want a while loop for the resizing, you want to find out the resizing ratio, which is a simple bit of math.

(width / height) = (new_width / new_height)

If you know one of the 'new' sizes, the other can be found via multiplication

new_height * (width / height) = new_width

You can also use the lazy method provided by BufferedImage's superclass Image, getScaledInstance() - using -1 for either width or height will maintain aspect ratio

ex:
scaledPic = picture.getScaledInstance(new_width, -1, Image.SCALE_FAST);