package center.sciprog.maps.compose import androidx.compose.foundation.layout.fillMaxSize import androidx.compose.runtime.Composable import androidx.compose.runtime.key import androidx.compose.runtime.remember import androidx.compose.ui.Modifier import androidx.compose.ui.input.pointer.PointerEvent import androidx.compose.ui.unit.DpSize import androidx.compose.ui.unit.dp import center.sciprog.maps.coordinates.* import kotlin.math.PI import kotlin.math.log2 import kotlin.math.min //TODO consider replacing by modifier /** */ public data class MapViewConfig( val zoomSpeed: Double = 1.0 / 3.0, val onClick: MapViewPoint.(PointerEvent) -> Unit = {}, val dragHandle: DragHandle = DragHandle.BYPASS, val onViewChange: MapViewPoint.() -> Unit = {}, val onSelect: (GmcRectangle) -> Unit = {}, val zoomOnSelect: Boolean = true, val onCanvasSizeChange: (DpSize) -> Unit = {}, ) @Composable public expect fun MapView( mapTileProvider: MapTileProvider, initialViewPoint: MapViewPoint, featuresState: MapFeaturesState, config: MapViewConfig = MapViewConfig(), modifier: Modifier = Modifier.fillMaxSize(), ) internal val defaultCanvasSize = DpSize(512.dp, 512.dp) public fun GmcRectangle.computeViewPoint( mapTileProvider: MapTileProvider, canvasSize: DpSize = defaultCanvasSize, ): MapViewPoint { val zoom = log2( min( canvasSize.width.value / longitudeDelta.radians.value, canvasSize.height.value / latitudeDelta.radians.value ) * PI / mapTileProvider.tileSize ) return MapViewPoint(center, zoom) } /** * A builder for a Map with static features. */ @Composable public fun MapView( mapTileProvider: MapTileProvider, initialViewPoint: MapViewPoint? = null, initialRectangle: GmcRectangle? = null, featureMap: Map<FeatureId<*>, MapFeature>, config: MapViewConfig = MapViewConfig(), modifier: Modifier = Modifier.fillMaxSize(), ) { val featuresState = key(featureMap) { MapFeaturesState.build { featureMap.forEach { feature(it.key.id, it.value) } } } val viewPointOverride: MapViewPoint = remember(initialViewPoint, initialRectangle) { initialViewPoint ?: initialRectangle?.computeViewPoint(mapTileProvider) ?: featureMap.values.computeBoundingBox(1.0)?.computeViewPoint(mapTileProvider) ?: MapViewPoint.globe } MapView(mapTileProvider, viewPointOverride, featuresState, config, modifier) } /** * Draw a map using convenient parameters. If neither [initialViewPoint], noe [initialRectangle] is defined, * use map features to infer view region. * @param initialViewPoint The view point of the map using center and zoom. Is used if provided * @param initialRectangle The rectangle to be used for view point computation. Used if [initialViewPoint] is not defined. * @param buildFeatures - a builder for features */ @Composable public fun MapView( mapTileProvider: MapTileProvider, initialViewPoint: MapViewPoint? = null, initialRectangle: GmcRectangle? = null, config: MapViewConfig = MapViewConfig(), modifier: Modifier = Modifier.fillMaxSize(), buildFeatures: MapFeaturesState.() -> Unit = {}, ) { val featureState = MapFeaturesState.remember(buildFeatures) val viewPointOverride: MapViewPoint = remember(initialViewPoint, initialRectangle) { initialViewPoint ?: initialRectangle?.computeViewPoint(mapTileProvider) ?: featureState.features.values.computeBoundingBox(1.0)?.computeViewPoint(mapTileProvider) ?: MapViewPoint.globe } val featureDrag: DragHandle = DragHandle.withPrimaryButton { event, start, end -> featureState.forEachWithAttribute(DraggableAttribute) { _, handle -> if (!handle.handle(event, start, end)) return@withPrimaryButton false } true } val newConfig = config.copy( dragHandle = DragHandle.combine(featureDrag, config.dragHandle) ) MapView( mapTileProvider = mapTileProvider, initialViewPoint = viewPointOverride, featuresState = featureState, config = newConfig, modifier = modifier, ) }