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// Set a new `value` and a the `interpolatedSignal` will emit a number of values between our current `value` and the new `value`. | |
import Foundation | |
import ReactiveKit | |
class InterpolatedFloat { | |
private let bag = DisposeBag() | |
let interpolationPeriod: TimeInterval | |
let interpolationSteps: Int | |
private var oldValue: Float = 0.0 | |
init(interpolationPeriod: TimeInterval = 0.4, | |
interpolationSteps: Int = 4, | |
createTimedSignal: @escaping (Float, Double, DispatchQueue) -> Signal<Float, ReactiveKit.NoError> = SafeSignal<Float>.timer) { | |
self.interpolationPeriod = interpolationPeriod | |
self.interpolationSteps = interpolationSteps | |
_value.skip(first: 1).observeOn(DispatchQueue.main).observeNext { [weak self] newValue in | |
guard let `self` = self else { return } | |
for i in 1...self.interpolationSteps { | |
let increment = (newValue - self.oldValue) / Float(interpolationSteps) * Float(i) | |
let next = self.oldValue + increment | |
let time = self.interpolationPeriod / TimeInterval(self.interpolationSteps) * TimeInterval(i) | |
let timedSignal = createTimedSignal(next, time, DispatchQueue(label: "com.HaloSport.interpolatedFloat")) | |
timedSignal.bind(to: self.interpolated) | |
} | |
self.oldValue = newValue | |
}.dispose(in: bag) | |
} | |
private var _value = Property<Float>(0) | |
var value: Float { | |
set { | |
_value.value = newValue | |
} get { | |
return _value.value | |
} | |
} | |
private var interpolated = Property<Float>(0) | |
var interpolatedSignal: Signal1<Float> { | |
return interpolated.toSignal() | |
} | |
} | |
import XCTest | |
class InterpolatedSignalTests: XCTestCase { | |
func testSettingValues() { | |
let signal = InterpolatedFloat(interpolationPeriod: 1.0, interpolationSteps: 10) | |
func testSettingValue(startingValue: Float, newValue: Float, extra: String = "a") { | |
let expect = expectation(description: "completed signal") | |
var expected: Float = startingValue | |
signal.interpolatedSignal.observeNext { next in | |
debugPrint("next \(next) expected \(expected) \(extra)") | |
XCTAssertEqual(expected, next, accuracy: 0.000_001) | |
expected += (newValue - startingValue) / Float(signal.interpolationSteps) | |
if next == newValue { | |
expect.fulfill() | |
} | |
}.dispose(in: bag) | |
signal.value = newValue | |
} | |
testSettingValue(startingValue: 0.0, newValue: 100.0) | |
waitForExpectations(timeout: 2.0, handler: nil) | |
bag.dispose() | |
testSettingValue(startingValue: 100.0, newValue: 20.0, extra: "b") | |
waitForExpectations(timeout: 2.0, handler: nil) | |
bag.dispose() | |
testSettingValue(startingValue: 20.0, newValue: 0.0, extra: "c") | |
waitForExpectations(timeout: 2.0, handler: nil) | |
bag.dispose() | |
testSettingValue(startingValue: 0.0, newValue: 1.0, extra: "d") | |
waitForExpectations(timeout: 2.0, handler: nil) | |
bag.dispose() | |
} | |
func testTiming() { | |
var times: [Double] = [] | |
func timerFunction(element: Float, time: Double, q: DispatchQueue) -> Signal<Float, ReactiveKit.NoError> { | |
times.append(time) | |
return Signal1<Float>.just(element) | |
} | |
let signal = InterpolatedFloat(interpolationPeriod: 1.0, interpolationSteps: 10, createTimedSignal: timerFunction) | |
signal.value = 100.0 | |
let expected = [0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0] | |
XCTAssertEqual(times.count, expected.count) | |
for i in 0..<expected.count { | |
XCTAssertEqual(times[i], expected[i], accuracy: 0.000_000_1) | |
} | |
} | |
} |
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