When resizing images, dragging only the image's corner(s) ensures that the aspect ratio remains unchanged.
I often export images from Corel Draw X6 to other vector formats, like Scalable Vector Graphics (SVG) and Enhanced Windows Metafile (EMF). From time to time I have to supply such images (i.e. SVG and/or EMF) to other people, whom I would like to force to maintain the aspect ratio.
I happen to know that the SVG format has a parameter "preserveAspectRatio=..." which can be used in the <svg> tag (see http://www.w3schools.com/svg/svg_reference.asp, under <svg> tag). However, this only seems to work in websites (So far, I haven't been in a position to check this.)
But how can I "lock" the aspect ration in an SVG generated in Corel Draw, ensuring that the ratio is always locked, i.e. also in images used in other non-internet documents?