void crop(ImageType& image)
{
if(imageLoaded(image))
{
// initialize to -1 for input validation
int ULr = -1, ULc = -1, LRr = -1, LRc = -1;
int N, M, Q;
int errorCode = 0;
// get values
image.getImageInfo(N,M,Q);
// get inputs
cout << "Enter the upper left corner's row: ";
cin >> ULr;
cout << endl << "Enter the upper left corner's column: ";
cin >> ULc;
cout << endl << "Enter the lower right corner's row: ";
cin >> LRr;
cout << endl << "Enter the lower right corner's column: ";
cin >> LRc;
// check for errors
if(ULr < 0 || ULc < 0 || LRr < 0 || LRc < 0)
errorCode = 1;
else if(ULr > N || LRr > N || ULc > M || LRc > M)
errorCode = 2;
else if(ULr >= LRr || ULc >= LRc)
errorCode = 3;
switch(errorCode)
{
case 1:
cout << "ERROR: All inputs must be non-negative.";
break;
case 2:
cout << "ERROR: All crop boundaries must be within image boundaries.";
break;
case 3:
cout << "ERROR: All crop boundaries must be in the correct order.";
break;
}
// crop image if no error was found
if(errorCode == 0)
{
image.getSubImage(ULr, ULc, LRr, LRc, image);
cout << endl << endl << "Image has been cropped successfully.";
}
pressEnterToContinue();
}
}
