58 lines
2.3 KiB
Swift
58 lines
2.3 KiB
Swift
//
|
|
// Copyright (c) 2022 Touch Instinct
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the Software), to deal
|
|
// in the Software without restriction, including without limitation the rights
|
|
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
// copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in
|
|
// all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
// THE SOFTWARE.
|
|
//
|
|
|
|
import CoreGraphics
|
|
|
|
public protocol OrientationAwareDrawingOperation: DrawingOperation {
|
|
var flipHorizontallyDuringDrawing: Bool { get set }
|
|
}
|
|
|
|
extension OrientationAwareDrawingOperation {
|
|
func apply(in context: CGContext, operation: (CGContext) -> Void) {
|
|
if flipHorizontallyDuringDrawing {
|
|
let flipVertical = CGAffineTransform(a: 1,
|
|
b: 0,
|
|
c: 0,
|
|
d: -1,
|
|
tx: 0,
|
|
ty: affectedArea(in: context).height)
|
|
|
|
context.concatenate(flipVertical)
|
|
operation(context)
|
|
context.concatenate(flipVertical.inverted())
|
|
} else {
|
|
operation(context)
|
|
}
|
|
}
|
|
|
|
func offsetForDrawing(_ offset: CGPoint) -> CGPoint {
|
|
flipHorizontallyDuringDrawing ? offset.horizontallyFlipped() : offset
|
|
}
|
|
|
|
func affectedAreaForDrawing(in context: CGContext?) -> CGRect {
|
|
var area = affectedArea(in: context)
|
|
area.origin = offsetForDrawing(area.origin)
|
|
|
|
return area
|
|
}
|
|
}
|