88 lines
3.1 KiB
Swift
88 lines
3.1 KiB
Swift
//
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// Copyright (c) 2017 Touch Instinct
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the Software), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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import CoreGraphics
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struct BorderDrawingOperation: DrawingOperation {
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private let image: CGImage
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private let imageSize: CGSize
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private let border: CGFloat
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private let color: CGColor
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private let radius: CGFloat
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private let extendSize: Bool
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public init(image: CGImage,
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imageSize: CGSize,
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border: CGFloat,
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color: CGColor,
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radius: CGFloat,
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extendSize: Bool) {
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self.image = image
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self.imageSize = imageSize
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self.border = border
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self.color = color
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self.radius = radius
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self.extendSize = extendSize
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}
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public var contextSize: CGContextSize {
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let offset = extendSize ? border : 0
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let width = imageSize.width + offset * 2
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let height = imageSize.height + offset * 2
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return CGSize(width: width, height: height).ceiledContextSize
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}
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public func apply(in context: CGContext) {
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let offset = extendSize ? border : 0
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let newWidth = imageSize.width + offset * 2
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let newHeight = imageSize.height + offset * 2
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let ctxSize = contextSize
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let ctxRect = CGRect(origin: .zero, size: CGSize(width: ctxSize.width, height: ctxSize.height))
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let imageRect = CGRect(x: offset, y: offset, width: imageSize.width, height: imageSize.height)
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context.draw(image, in: imageRect)
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context.setStrokeColor(color)
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let widthDiff = CGFloat(ctxSize.width) - newWidth // difference between context width and real width
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let heightDiff = CGFloat(ctxSize.height) - newHeight // difference between context height and real height
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let inset = ctxRect.insetBy(dx: border / 2 + widthDiff, dy: border / 2 + heightDiff)
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if radius != 0 {
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context.setLineWidth(border)
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context.addPath(UIBezierPath(roundedRect: inset, cornerRadius: radius).cgPath)
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context.strokePath()
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} else {
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context.stroke(inset, width: border)
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}
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}
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}
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