Grid

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$('#image-1').rcrop({
    grid : true
});

Image full selected

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$('#image-2').rcrop({
    full : true
});

Crop area size

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$('#image-3').rcrop({
    minSize : [160,90],
    maxSize : [800,800]
});

Preserve Aspect Ratio

You can force to preserve an aspect ratio. Use minSize not only to define crop area's minimum width and height, but crop aspect ratio too.

$('#image-4').rcrop({
    minSize : [160,90],
    preserveAspectRatio : true,
    grid : true
});