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requirements with math
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Moony-H
March 15, 2025
Programming
0
560
requirements with math
Google Developer Group Korea Super.init(V6) Presentation
Moony-H
March 15, 2025
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Transcript
Korea Android ࣻਵ۽ UI ਃҳࢎ೦ ݅ೞӝ MoonHwi Han super.init(version=6)
ࣻ… જইೞदաਃ? 저는 별로…
ࣻ… જইೞदաਃ?
ࣻ… જইೞदաਃ?
ࣻ… જইೞदաਃ?
Androidীח?
ࣻਸ ਊೠ ҃ , Ҋ١Ү ࣻਵ۽ ࢚ഐਊਸ ٜ݅ ࣻ .
пೣࣻ۽ ӝ ઁযೞӝ Korea Android super.init(version=6)
ਗ Ӓܻӝ “지도 위에 반경을 그리는 기능을 만들어주세요”
ਗ Ӓܻӝ
ਗ Ӓܻӝ
ਗ Ӓܻӝ MotionEvent.ACTION_MOVE -> { val dragPosX = it.x val
dragPosY = it.y }
ਗ Ӓܻӝ val dx = (circleCenterPos.x - dragPosX).toDouble() val dy
= (circleCenterPos.y - dragPosY).toDouble() val radPx = sqrt(dx.pow(2.0) + dy.pow(2.0)) val radMeter = radPx * naverMap.projection.metersPerPixel
ਗ Ӓܻӝ circle.radius = radMeter
ਗ Ӓܻӝ MotionEvent.ACTION_MOVE -> { val dragPosX = it.x val
dragPosY = it.y val dx = (circleCenterPos.x - dragPosX).toDouble() val dy = (circleCenterPos.y - dragPosY).toDouble() val radPx = sqrt(dx.pow(2.0) + dy.pow(2.0)) val radMeter = radPx * naverMap.projection.metersPerPixel circle.radius = if (radMeter > 500) 500.0 else radMeter }
ਗ Ӓܻӝ
ਗ Ӓܻӝ ߈ܴ rਸ 500m۽ ઁೠ
ਗ Ӓܻӝ indicatorח (x, y)о ইצ (x’, y’)ܳ ٮۄоঠ ೠ.
ਗ Ӓܻӝ
ਗ Ӓܻӝ
ਗ Ӓܻӝ
ਗ Ӓܻӝ val degree = atan2(dy, dx)
ਗ Ӓܻӝ
ਗ Ӓܻӝ val x = radiusLimitPx * cos(degree) * -1
val y = radiusLimitPx * sin(degree) * -1
ਗ Ӓܻӝ MotionEvent.ACTION_MOVE -> { val dragPosX = it.x val
dragPosY = it.y val dx = (circleCenterPos.x - dragPosX).toDouble() val dy = (circleCenterPos.y - dragPosY).toDouble() val radPx = sqrt(dx.pow(2.0) + dy.pow(2.0)) val radMeter = radPx * naverMap.projection.metersPerPixel }
ਗ Ӓܻӝ if (radPx > radiusLimitPx) { //пب ҳೞӝ val
degree = atan2(dy, dx) val x = radiusLimitPx * cos(degree) * -1 val y = radiusLimitPx * sin(degree) * -1
ਗ Ӓܻӝ val circleCenterPx = naverMap.projection.toScreenLocation(circle.center) val latLng = naverMap.projection.fromScreenLocation(
PointF( x.toFloat() + circleCenterPx.x, y.toFloat() + circleCenterPx.y ) ) indicator.position = latLng circle.radius = radiusLimit
ਗ Ӓܻӝ else { circleMarker.position = naverMap.projection.fromScreenLocation(PointF(it.x, it.y)) circle.radius =
circle.center.distanceTo(circleMarker.position) }
ਗ Ӓܻӝ
ਗ Ӓܻӝ
пೣࣻ & Vector۽ ഥೞӝ Korea Android super.init(version=6)
ഥ “이미지를 핸들로 회전할 수 있게 해 주세요”
ഥ
ഥ
ഥ
ഥ
ഥ
ഥ ઁ 2 ࢎੋ ߨ
ഥ
ഥ
ഥ fun Offset.distanceTo(offset: Offset): Float = sqrt((this.x - offset.x).pow(2)
+ (this.y - offset.y).pow(2))
ഥ val a = touchPos.distanceTo(prevPos) val b = prevPos.distanceTo(imagePos)
val c = imagePos.distanceTo(touchPos) val cosA = (b.pow(2) + c.pow(2) - a.pow(2)) / (2 * b * c)
ഥ val currDegree = Math.toDegrees(acos(cosA).toDouble()).toFloat()
ഥ
ഥ
ഥ ҳೠ пبח ೦࢚ নࣻ ߑೱ হ
ഥ
߭ఠ ৻
߭ఠ ৻
߭ఠ ৻
߭ఠ ৻ fun Offset.toVectorOffset(offset: Offset) = Offset(offset.x - this.x, offset.y
- this.y) fun Offset.crossProduct(offset: Offset) = this.x * offset.y - this.y * offset.x
߭ఠ ৻ degree = Degree(degree.value + if (product < 0)
+currDegree else -currDegree)
߭ఠ ৻
݃ݴ Korea Android super.init(version=6)
ࣻ… જই࣑աਃ? 저는 별로…
ࣻ… જই࣑աਃ? ࣻҗ ೡࣻ۾ ҳഅ ևযפ.
хࢎפ
None