| /* |
| Copyright 2017-present The Material Motion Authors. All Rights Reserved. |
| |
| Licensed under the Apache License, Version 2.0 (the "License"); |
| you may not use this file except in compliance with the License. |
| You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| */ |
| |
| import XCTest |
| import MotionInterchange |
| |
| class CAMediaTimingFunctionTests: XCTestCase { |
| func testReversalAlgorithm() { |
| let curve = CAMediaTimingFunction(controlPoints: 0.1, 0.2, 0.3, 0.4) |
| let reversed = curve.mdm_reversed() |
| XCTAssertEqual(curve.mdm_point1.x, 1 - reversed.mdm_point2.x, accuracy: 0.001) |
| XCTAssertEqual(curve.mdm_point1.y, 1 - reversed.mdm_point2.y, accuracy: 0.001) |
| XCTAssertEqual(curve.mdm_point2.x, 1 - reversed.mdm_point1.x, accuracy: 0.001) |
| XCTAssertEqual(curve.mdm_point2.y, 1 - reversed.mdm_point1.y, accuracy: 0.001) |
| } |
| |
| func testReversingBezierCurveTwiceGivesSameResult() { |
| let curve = CAMediaTimingFunction(controlPoints: 0.1, 0.2, 0.3, 0.4) |
| let reversed = curve.mdm_reversed() |
| let reversedAgain = reversed.mdm_reversed() |
| XCTAssertEqual(curve.mdm_point1.x, reversedAgain.mdm_point1.x, accuracy: 0.001) |
| XCTAssertEqual(curve.mdm_point1.y, reversedAgain.mdm_point1.y, accuracy: 0.001) |
| XCTAssertEqual(curve.mdm_point2.x, reversedAgain.mdm_point2.x, accuracy: 0.001) |
| XCTAssertEqual(curve.mdm_point2.y, reversedAgain.mdm_point2.y, accuracy: 0.001) |
| } |
| } |