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Objective-C code to fit a CGRect inside or outside another CGRect while maintaining aspect ratio. The fitted rectangle is centered on the target rectangle.
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CGFloat ScaleToAspectFitRectInRect(CGRect rfit, CGRect rtarget) | |
{ | |
// first try to match width | |
CGFloat s = CGRectGetWidth(rtarget) / CGRectGetWidth(rfit); | |
// if we scale the height to make the widths equal, does it still fit? | |
if (CGRectGetHeight(rfit) * s <= CGRectGetHeight(rtarget)) { | |
return s; | |
} | |
// no, match height instead | |
return CGRectGetHeight(rtarget) / CGRectGetHeight(rfit); | |
} | |
CGRect AspectFitRectInRect(CGRect rfit, CGRect rtarget) | |
{ | |
CGFloat s = ScaleToAspectFitRectInRect(rfit, rtarget); | |
CGFloat w = CGRectGetWidth(rfit) * s; | |
CGFloat h = CGRectGetHeight(rfit) * s; | |
CGFloat x = CGRectGetMidX(rtarget) - w / 2; | |
CGFloat y = CGRectGetMidY(rtarget) - h / 2; | |
return CGRectMake(x, y, w, h); | |
} | |
CGFloat ScaleToAspectFitRectAroundRect(CGRect rfit, CGRect rtarget) | |
{ | |
// fit in the target inside the rectangle instead, and take the reciprocal | |
return 1 / ScaleToAspectFitRectInRect(rtarget, rfit); | |
} | |
CGRect AspectFitRectAroundRect(CGRect rfit, CGRect rtarget) | |
{ | |
CGFloat s = ScaleToAspectFitRectAroundRect(rfit, rtarget); | |
CGFloat w = CGRectGetWidth(rfit) * s; | |
CGFloat h = CGRectGetHeight(rfit) * s; | |
CGFloat x = CGRectGetMidX(rtarget) - w / 2; | |
CGFloat y = CGRectGetMidY(rtarget) - h / 2; | |
return CGRectMake(x, y, w, h); | |
} |
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