Coding: Don’t make mistakes when resizing objects! Preserve the initial ratio correctly!
Posted on 17. Jun, 2009 by Dragos in Coding
I was tempted many times to do quick adjustments to my code, without taking into consideration some basic mathematical principles. For examples if a box is first of all 100px tall and 60px wide, and then I notice that this box does not fit the place where it was intended to be placed, what I did was to subtract 10 px from the width of the box, for it to fit some area, and at the same time I subtracted 10 px from the height also, thinking that doing so I kept the ratio of the initial sizes of the box. In fact this is not true!
Here’s why:
The ratio of the initial box is 100px/60px=1.66
In the second case the ratio is: (100px-10px)/(60px-10px)=1.8
So, if you used to apply the same technique as I did to quickly resize objects, forget about it, as it’s wrong! Instead use the old method from school to determine a variable from two fractions, preserving the ratios. Back to the example above, in order to find out the new height value of the box I’d use this formula: 100px/60px=(100px-10px)/x, so x=60px*90px/100px=54px (instead of the incorrect value of 50px). That’s it!
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