Add tests for gesture service, fix bug with perpendicular directions

This commit is contained in:
shpuld 2019-03-26 22:11:45 +02:00
parent e23c19468a
commit c50e64f8ee
2 changed files with 129 additions and 6 deletions

View file

@ -10,11 +10,14 @@ const touchEventCoord = e => ([e.touches[0].screenX, e.touches[0].screenY])
const vectorLength = v => Math.sqrt(v[0] * v[0] + v[1] * v[1])
const perpendicular = v => [v[1], v[0]]
const perpendicular = v => [v[1], -v[0]]
const dotProduct = (v1, v2) => v1[0] * v2[0] + v1[1] * v2[1]
const vectorFlatten = (v1, v2) => [v1[0] * v2[0], v1[1] * v2[1]]
const project = (v1, v2) => {
const scalar = (dotProduct(v1, v2) / dotProduct(v2, v2))
return [scalar * v2[0], scalar * v2[1]]
}
// direction: either use the constants above or an arbitrary 2d vector.
// threshold: how many Px to move from touch origin before checking if the
@ -46,12 +49,12 @@ const updateSwipe = (event, gesture) => {
// movement is opposite from direction
if (dotProduct(delta, gesture.direction) < 0) return
// movement perpendicular to direction is too much
const towardsDir = vectorFlatten(gesture.direction, delta)
const towardsDir = project(delta, gesture.direction)
const perpendicularDir = perpendicular(gesture.direction)
const towardsPerpendicular = vectorFlatten(perpendicularDir, delta)
const towardsPerpendicular = project(delta, perpendicularDir)
if (
vectorLength(towardsDir) <
gesture.perpendicularTolerance * vectorLength(towardsPerpendicular)
vectorLength(towardsDir) * gesture.perpendicularTolerance <
vectorLength(towardsPerpendicular)
) return
gesture.onSwipe()

View file

@ -0,0 +1,120 @@
import GestureService from 'src/services/gesture_service/gesture_service.js'
const mockTouchEvent = (x, y) => ({
touches: [
{
screenX: x,
screenY: y
}
]
})
describe.only('GestureService', () => {
describe('swipeGesture', () => {
it('calls the callback on a successful swipe', () => {
let swiped = false
const callback = () => { swiped = true }
const gesture = GestureService.swipeGesture(
GestureService.DIRECTION_RIGHT,
callback
)
GestureService.beginSwipe(mockTouchEvent(100, 100), gesture)
GestureService.updateSwipe(mockTouchEvent(200, 100), gesture)
expect(swiped).to.eql(true)
})
it('calls the callback only once per begin', () => {
let hits = 0
const callback = () => { hits += 1 }
const gesture = GestureService.swipeGesture(
GestureService.DIRECTION_RIGHT,
callback
)
GestureService.beginSwipe(mockTouchEvent(100, 100), gesture)
GestureService.updateSwipe(mockTouchEvent(150, 100), gesture)
GestureService.updateSwipe(mockTouchEvent(200, 100), gesture)
expect(hits).to.eql(1)
})
it('doesn\'t call the callback on an opposite swipe', () => {
let swiped = false
const callback = () => { swiped = true }
const gesture = GestureService.swipeGesture(
GestureService.DIRECTION_RIGHT,
callback
)
GestureService.beginSwipe(mockTouchEvent(100, 100), gesture)
GestureService.updateSwipe(mockTouchEvent(0, 100), gesture)
expect(swiped).to.eql(false)
})
it('doesn\'t call the callback on a swipe below threshold', () => {
let swiped = false
const callback = () => { swiped = true }
const gesture = GestureService.swipeGesture(
GestureService.DIRECTION_RIGHT,
callback,
100
)
GestureService.beginSwipe(mockTouchEvent(100, 100), gesture)
GestureService.updateSwipe(mockTouchEvent(150, 100), gesture)
expect(swiped).to.eql(false)
})
it('doesn\'t call the callback on a perpendicular swipe', () => {
let swiped = false
const callback = () => { swiped = true }
const gesture = GestureService.swipeGesture(
GestureService.DIRECTION_RIGHT,
callback,
30,
0.5
)
GestureService.beginSwipe(mockTouchEvent(100, 100), gesture)
GestureService.updateSwipe(mockTouchEvent(150, 200), gesture)
expect(swiped).to.eql(false)
})
it('calls the callback on perpendicular swipe if within tolerance', () => {
let swiped = false
const callback = () => { swiped = true }
const gesture = GestureService.swipeGesture(
GestureService.DIRECTION_RIGHT,
callback,
30,
2.0
)
GestureService.beginSwipe(mockTouchEvent(100, 100), gesture)
GestureService.updateSwipe(mockTouchEvent(150, 150), gesture)
expect(swiped).to.eql(true)
})
it('works with any arbitrary 2d directions', () => {
let swiped = false
const callback = () => { swiped = true }
const gesture = GestureService.swipeGesture(
[-1, -1],
callback,
30,
0.1
)
GestureService.beginSwipe(mockTouchEvent(100, 100), gesture)
GestureService.updateSwipe(mockTouchEvent(60, 60), gesture)
expect(swiped).to.eql(true)
})
})
})