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Merge pull request #87 from TimPushkin/pin-pointer
Pin pointer
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app/src/main/java/ru/spbu/depnav/ui/component/PinPointer.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,177 @@ | ||
| /** | ||
| * DepNav -- department navigator. | ||
| * Copyright (C) 2024 Timofei Pushkin | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
| */ | ||
|
|
||
| package ru.spbu.depnav.ui.component | ||
|
|
||
| import androidx.compose.animation.AnimatedVisibility | ||
| import androidx.compose.animation.fadeIn | ||
| import androidx.compose.animation.fadeOut | ||
| import androidx.compose.animation.scaleIn | ||
| import androidx.compose.animation.scaleOut | ||
| import androidx.compose.animation.slideIn | ||
| import androidx.compose.animation.slideOut | ||
| import androidx.compose.foundation.layout.absoluteOffset | ||
| import androidx.compose.runtime.Composable | ||
| import androidx.compose.runtime.LaunchedEffect | ||
| import androidx.compose.runtime.getValue | ||
| import androidx.compose.runtime.mutableStateOf | ||
| import androidx.compose.runtime.remember | ||
| import androidx.compose.runtime.setValue | ||
| import androidx.compose.ui.Modifier | ||
| import androidx.compose.ui.draw.rotate | ||
| import androidx.compose.ui.platform.LocalDensity | ||
| import androidx.compose.ui.unit.IntOffset | ||
| import androidx.compose.ui.unit.IntSize | ||
| import androidx.lifecycle.compose.collectAsStateWithLifecycle | ||
| import kotlinx.coroutines.flow.Flow | ||
| import ovh.plrapps.mapcompose.api.VisibleArea | ||
| import ovh.plrapps.mapcompose.api.fullSize | ||
| import ovh.plrapps.mapcompose.api.getLayoutSizeFlow | ||
| import ovh.plrapps.mapcompose.ui.state.MapState | ||
| import ovh.plrapps.mapcompose.utils.AngleDegree | ||
| import ovh.plrapps.mapcompose.utils.Point | ||
| import ru.spbu.depnav.data.model.Marker | ||
| import ru.spbu.depnav.utils.map.LineSegment | ||
| import ru.spbu.depnav.utils.map.bottom | ||
| import ru.spbu.depnav.utils.map.centroid | ||
| import ru.spbu.depnav.utils.map.contains | ||
| import ru.spbu.depnav.utils.map.left | ||
| import ru.spbu.depnav.utils.map.rectangularVisibleArea | ||
| import ru.spbu.depnav.utils.map.right | ||
| import ru.spbu.depnav.utils.map.rotation | ||
| import ru.spbu.depnav.utils.map.top | ||
|
|
||
| /** | ||
| * When the pin is outside of the map area visible on the screen, shows a pointer towards the pin. | ||
| * | ||
| * It is intended to be placed exactly over the map's composable. | ||
| */ | ||
| @Composable | ||
| fun PinPointer(mapState: MapState, pin: Marker?) { | ||
| var mapLayoutSizeFlow by remember { mutableStateOf<Flow<IntSize>?>(null) } | ||
| LaunchedEffect(mapState) { mapLayoutSizeFlow = mapState.getLayoutSizeFlow() } | ||
| val mapLayoutSize by mapLayoutSizeFlow?.collectAsStateWithLifecycle(IntSize.Zero) ?: return | ||
| if (mapLayoutSize == IntSize.Zero) { | ||
| return | ||
| } | ||
|
|
||
| val pinSize = with(LocalDensity.current) { PIN_SIZE.roundToPx() } | ||
|
|
||
| val pinPoint = pin?.run { Point(x * mapState.fullSize.width, y * mapState.fullSize.height) } | ||
| val visibleArea = mapState.rectangularVisibleArea(mapLayoutSize) // Area visible on the screen | ||
|
|
||
| val currentPointerPose = | ||
| if ( | ||
| pinPoint != null && | ||
| !mapState.rectangularVisibleArea( // Area on which the pin is visible on the screen | ||
| mapLayoutSize, | ||
| leftPadding = pinSize / 2, | ||
| rightPadding = pinSize / 2, | ||
| bottomPadding = pinSize | ||
| ).contains(pinPoint) | ||
| ) { | ||
| calculatePointerPose(visibleArea, pinPoint) | ||
| } else { | ||
| null // There is no pin or it is visible on the screen | ||
| } | ||
|
|
||
| // Have to remember the latest non-null pointer pose to continue showing it while the exit | ||
| // animation is still in progress | ||
| var lastPointerPose by remember { mutableStateOf(PinPointerPose.Empty) } | ||
| if (currentPointerPose != null) { | ||
| lastPointerPose = currentPointerPose | ||
| } | ||
|
|
||
| AnimatedVisibility( | ||
| visible = currentPointerPose != null, | ||
| modifier = Modifier.absoluteOffset { lastPointerPose.coordinates(mapLayoutSize, pinSize) }, | ||
| enter = fadeIn() + slideIn { lastPointerPose.slideAnimationOffset(it) } + scaleIn(), | ||
| exit = fadeOut() + slideOut { lastPointerPose.slideAnimationOffset(it) } + scaleOut() | ||
| ) { | ||
| // Cannot use mapState.rotation since it has a different pivot | ||
| Pin(modifier = Modifier.rotate(lastPointerPose.direction - visibleArea.rotation())) | ||
| } | ||
| } | ||
|
|
||
| private data class PinPointerPose( | ||
| val side: Side, | ||
| val sideFraction: Float, | ||
| val direction: AngleDegree | ||
| ) { | ||
| enum class Side { LEFT, RIGHT, TOP, BOTTOM } | ||
|
|
||
| companion object { | ||
| val Empty = PinPointerPose(Side.TOP, 0f, 0f) | ||
| } | ||
|
|
||
| fun coordinates(boxSize: IntSize, pinSize: Int): IntOffset { | ||
| return when (side) { | ||
| Side.LEFT -> IntOffset( | ||
| x = 0, | ||
| y = (boxSize.height * sideFraction - pinSize / 2f) | ||
| .toInt() | ||
| .coerceIn(0, boxSize.height - pinSize) | ||
| ) | ||
| Side.RIGHT -> IntOffset( | ||
| x = (boxSize.width - pinSize).coerceAtLeast(0), | ||
| y = (boxSize.height * sideFraction - pinSize / 2f) | ||
| .toInt() | ||
| .coerceIn(0, boxSize.height - pinSize) | ||
| ) | ||
| Side.TOP -> IntOffset( | ||
| x = (boxSize.width * sideFraction - pinSize / 2f) | ||
| .toInt() | ||
| .coerceIn(0, boxSize.width - pinSize), | ||
| y = 0 | ||
| ) | ||
| Side.BOTTOM -> IntOffset( | ||
| x = (boxSize.width * sideFraction - pinSize / 2f) | ||
| .toInt() | ||
| .coerceIn(0, boxSize.width - pinSize), | ||
| y = (boxSize.height - pinSize).coerceAtLeast(0) | ||
| ) | ||
| } | ||
| } | ||
|
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||
| fun slideAnimationOffset(pinSize: IntSize) = when (side) { | ||
| Side.LEFT -> IntOffset(x = -pinSize.width, y = 0) | ||
| Side.RIGHT -> IntOffset(x = pinSize.width, y = 0) | ||
| Side.TOP -> IntOffset(x = 0, y = -pinSize.height) | ||
| Side.BOTTOM -> IntOffset(x = 0, y = pinSize.height) | ||
| } | ||
| } | ||
|
|
||
| private fun calculatePointerPose(visibleArea: VisibleArea, pin: Point): PinPointerPose { | ||
| val centroidPinSegment = LineSegment(visibleArea.centroid(), pin) | ||
| val direction = centroidPinSegment.slope() - 90 | ||
|
|
||
| visibleArea.top().fractionOfIntersectionWith(centroidPinSegment)?.let { fraction -> | ||
| return PinPointerPose(PinPointerPose.Side.TOP, fraction, direction) | ||
| } | ||
| visibleArea.right().fractionOfIntersectionWith(centroidPinSegment)?.let { fraction -> | ||
| return PinPointerPose(PinPointerPose.Side.RIGHT, fraction, direction) | ||
| } | ||
| visibleArea.bottom().fractionOfIntersectionWith(centroidPinSegment)?.let { fraction -> | ||
| return PinPointerPose(PinPointerPose.Side.BOTTOM, fraction, direction) | ||
| } | ||
| visibleArea.left().fractionOfIntersectionWith(centroidPinSegment)?.let { fraction -> | ||
| return PinPointerPose(PinPointerPose.Side.LEFT, fraction, direction) | ||
| } | ||
|
|
||
| throw IllegalArgumentException("Pin lies inside the visible area") | ||
| } |
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