Title really says it all. I'm working on an image processing project, and am currently stuck on the crop function. It's fully functional, the user can select an area of the image, and crop that area. Only trouble is, the user won't actually know he's selected the image, because there is no rectangle spanning the selected area. I have no idea how to do this, and the Google is weak today.
Available info: x-coordinate, y-coordinate, length, and height.
Available info: x-coordinate, y-coordinate, length, and height.