map-alliance/src/app/views/map/map.component.ts

import {Component} from "@angular/core";
import {PhysicsService} from "../../services/physics/physics.service";
import {filter, skip, take} from "rxjs/operators";
import {MatBottomSheet, MatSnackBar} from "@angular/material";
import {CalibrateComponent} from "../../components/calibrate/calibrate.component";
import {ToolbarItem} from "../../components/toolbar/toolbarItem";
import {BehaviorSubject} from "rxjs";
import {LatLngLiteral} from "@agm/core";

declare const google;

@Component({
    selector: 'map',
    templateUrl: 'map.component.html',
    styleUrls: ['map.component.scss']
})
export class MapComponent {
    drawListener = [];
    mapApi: any;
    mapClick = new BehaviorSubject<LatLngLiteral>(null);
    position: any;
    style = 'terrain';
    isNaN = isNaN;

    menu: ToolbarItem[][] = [[
        {name: 'compass', icon: 'explore', click: () => this.calibrate(), hidden: true},
    ], [
        {name: 'marker', icon: 'room', toggle: true, individualToggle: true, click: () => this.addMarker()},
        {name: 'draw', icon: 'create', toggle: true, individualToggle: true, onEnabled: () => this.startDraw(), onDisabled: () => this.endDraw()},
        {name: 'measure', icon: 'straighten', toggle: true, individualToggle: true, click: () => this.measure()},
        {name: 'delete', icon: 'delete', toggle: true, individualToggle: true},
        {name: 'style', icon: 'terrain', enabled: true, toggle: true, onEnabled: () => this.style = 'terrain', onDisabled: () => this.style = 'satellite'},
        {name: 'compass', icon: 'explore', click: () => this.calibrate()}
    ], [
        {name: 'messages', icon: 'chat', hidden: true},
        {name: 'identity', icon: 'perm_identity', hidden: true},
        {name: 'settings', icon: 'settings', hidden: true}
    ]];

    constructor(public physicsService: PhysicsService, private snackBar: MatSnackBar, private bottomSheet: MatBottomSheet) {
        physicsService.info.pipe(filter(coord => !!coord)).subscribe(pos => {
            if(this.mapApi) {
                if(!this.position) this.center(pos);
                this.position = pos;

                if(this.position.heading != null) {
                    let marker: HTMLElement = document.querySelector('img[src*="arrow.png"]');
                    if(marker) marker.style.transform = `rotate(${this.position.heading}deg)`
                }
            }
        });

        physicsService.requireCalibration.subscribe(() => {
            snackBar.open('Compass requires calibration', 'calibrate', {
                duration: 5000,
                panelClass: 'bg-warning,text-white'
            }).onAction().subscribe(() => this.calibrate());
        });
    }

    addMarker() {
        this.mapClick.pipe(skip(1), take(1)).subscribe(coords => {
            this.menu[1][0].enabled = false;
            let marker = new google.maps.Marker({
                map: this.mapApi,
                position: {lat: coords.lat, lng: coords.lng}
            });
            google.maps.event.addListener(marker, 'click', () => {
                if(this.menu[1][3].enabled) marker.setMap(null)
            });
        });
    }

    measure() {
        let deg2rad = (deg) => deg * (Math.PI/180);

        let distanceInM = (lat1, lon1, lat2, lon2) => {
            const R = 6371; // Radius of the earth in km
            let dLat = deg2rad(lat2-lat1);  // deg2rad below
            let dLon = deg2rad(lon2-lon1);
            let a =
                Math.sin(dLat/2) * Math.sin(dLat/2) +
                Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) *
                Math.sin(dLon/2) * Math.sin(dLon/2)
            ;
            let c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
            return R * c * 1000
        };

        let first;
        this.mapClick.pipe(skip(1), take(2)).subscribe(coords => {
            if(!first) {
                first = coords;
            } else {
                this.menu[1][2].enabled = false;

                let line = new google.maps.Polyline({
                    map: this.mapApi,
                    path: [first, coords],
                    strokeColor: '#f00',
                    icons: [{
                        icon: {path: google.maps.SymbolPath.BACKWARD_CLOSED_ARROW},
                        offset: '0%'
                    }, {
                        icon: {path: google.maps.SymbolPath.FORWARD_CLOSED_ARROW},
                        offset: '100%'
                    }]
                });

                let distance = distanceInM(first.lat, first.lng, coords.lat, coords.lng);

                let marker = new google.maps.Marker({
                    map: this.mapApi,
                    icon: null,
                    position: {lat: (first.lat + coords.lat) / 2, lng: (first.lng + coords.lng) / 2},
                    label: distance >= 1000 ? `${Math.round(distance / 100) / 10} km` : `${Math.round(distance)} m`
                });

                google.maps.event.addListener(line, 'click', () => {
                    if(this.menu[1][3].enabled) {
                        line.setMap(null);
                        marker.setMap(null);
                    }
                })

                google.maps.event.addListener(marker, 'click', () => {
                    if(this.menu[1][3].enabled) {
                        line.setMap(null);
                        marker.setMap(null);
                    }
                })
            }
        })
    }

    calibrate() {
        this.bottomSheet.open(CalibrateComponent, {
            hasBackdrop: false,
            disableClose: true
        });
    }

    center(pos?) {
        if(!pos) pos = this.position;
        this.mapApi.setCenter({lat: pos.latitude, lng: pos.longitude});
    }

    startDraw() {
        this.mapApi.setOptions({draggable: false});

        let drawHander = () => {
            let poly = new google.maps.Polyline({map: this.mapApi, clickable: true});
            google.maps.event.addListener(poly, 'click', () => {
                if(this.menu[1][3].enabled) poly.setMap(null);
            });
            let moveListener = [
                google.maps.event.addListener(this.mapApi, 'touchmove', e => poly.getPath().push(e.latLng)),
                google.maps.event.addListener(this.mapApi, 'mousemove', e => poly.getPath().push(e.latLng))
            ];
            google.maps.event.addListener(this.mapApi, 'touchend', () => moveListener.forEach(listener => google.maps.event.removeListener(listener)));
            google.maps.event.addListener(this.mapApi, 'mouseup', () => moveListener.forEach(listener => google.maps.event.removeListener(listener)));
            google.maps.event.addListener(poly, 'touchend', () => moveListener.forEach(listener => google.maps.event.removeListener(listener)));
            google.maps.event.addListener(poly, 'mouseup', () => moveListener.forEach(listener => google.maps.event.removeListener(listener)));
        };

        this.drawListener = [
            google.maps.event.addDomListener(this.mapApi.getDiv(), 'touchstart', drawHander),
            google.maps.event.addDomListener(this.mapApi.getDiv(), 'mousedown', drawHander)
        ];
    }

    endDraw() {
        this.mapApi.setOptions({draggable: true});
        this.drawListener.forEach(listener => google.maps.event.removeListener(listener));
        this.drawListener = [];
    }
}