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@@ -456,12 +456,19 @@ public struct CroppingImageProcessor: ImageProcessor {
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/// - Parameters:
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/// - size: Target size of output image should be.
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/// - anchor: The anchor point from which the size should be calculated.
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+ /// Default is `CGPoint(x: 0.5, y: 0.5)`, which means the center of input image.
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/// - Note:
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/// The anchor point is consisted by two values between 0.0 and 1.0.
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/// It indicates a related point in current image, eg: (0.0, 0.0) for top-left
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/// corner, (0.5, 0.5) for center and (1.0, 1.0) for bottom-right corner.
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/// The `size` property of `CroppingImageProcessor` will be used along with
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/// `anchor` to calculate a target rectange in the size of image.
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+ ///
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+ /// The target size will be automatically calculated with a reasonable behavior.
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+ /// For example, when you have an image size of `CGSize(width: 100, height: 100)`,
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+ /// and a target size of `CGSize(width: 100, height: 100)`, with a (0.0, 0.0) anchor (top-left),
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+ /// the crop rect will be `{0, 0, 20, 20}`; with a (0.5, 0.5) anchor (center), it will be
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+ /// `{40, 40, 20, 20}`; while with a (1.0, 1.0) anchor (bottom-right), it will be `{80, 80, 20, 20}`
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public init(size: CGSize, anchor: CGPoint = CGPoint(x: 0.5, y: 0.5)) {
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self.size = size
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self.anchor = anchor
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