Compare two CGSize's to best persentage - objective-c

Question

Need your help, I have input CGSize (for example): 200x300. And array with other CGSize's = [20x20, 100x100, 150x150, 200x100, 200x250, 300x300...].
Please help me to find best item in array that have best compare percentage (for example its 200x250)...
I tried to use for enumerator, for example:
CGSize inputSize = CGSizeMake(200, 300);
for (int i = 0; i < array.count; i++)
{
CGSize concurentSize = CGSizeZero;
switch (i)
{
case 0:
{
concurentSize.width = 20;
concurentSize.height = 20;
}
and so on...
float differencePercentWidth = ( concurentSize.width / inputSize.width ) * 100.0;
float differencePercentHeight = ( concurentSize.height / inputSize.height ) * 100.0;
if (differencePercentWidth > 90 && differencePercentHeight > 90)
{
// FOUND best CGSize... stop
break.
}
}
But, its not working, it differencePercentWidth/differencePercentHeight can be > 100 =(
I need some of method or function that can compare 2 CGSize's in percent match... For example: size 200x300 is best matches with size 200x250... Something like:
float matchesInPerсent = CGSizeCompare(firstCGSize, secondCGSize);
//matchesInPerсent = 0.6; // in percents
Please help, sorry for my english, if you need more details, please let me know. Thanks.

Answer 1

Try the similar logic to calculate the maximum number in the array, but need to less then one finite value. In this cases calculate maximum percentage average of size.width and size.height, the maximum percentage which is closes to 1 is the winner. If you need the upper value of the 100% as well then you need to insert the logic to take that value below the 100% and run the same logic on those sizes as well.
Here is code which will give you closest percentage size from the array.
/*
sizes : array of the sizes represented in NSValue format
size: The size for which you need closest value.
*/
- (CGSize)bestMatch:(NSArray *)sizes withSize:(CGSize)size {
float bestMatch = 0.0;
CGSize bestMatchSize = CGSizeZero;
for (NSValue *value in sizes) {
float percentage = (value.CGSizeValue.width/size.width + value.CGSizeValue.height/size.height)/2;
//If you need greater then 100% and closes to the size
if (percentage > 1.0) {
percentage = -1*(percentage - 2);
}
if (bestMatch < percentage && percentage < 1) {
bestMatch = percentage;
bestMatchSize = value.CGSizeValue;
}
}
//If you need best match you can return bestMatch which is closest in percentage
return bestMatchSize;
}