Improve map performance by using static styles and image renderMode

 common.js

@@ -1,3 +1,5 @@
"use strict";

//var ttss_trams_base = 'http://www.ttss.krakow.pl/internetservice';
var ttss_trams_base = 'proxy_tram.php';
//var ttss_buses_base = 'http://91.223.13.70/internetservice';
@@ -112,10 +114,18 @@
    });
}

function tramIdToVehicleId(tramId) {
    for(var prop in vehicles_info) {
        if(vehicles_info[prop]['num'].substr(2) == tramId) {
            return prop;
function depotIdToVehicleId(depotId, typeHelper) {
    if(typeHelper) {
        for(var prop in vehicles_info) {
            if(prop.substr(0,1) == type && vehicles_info[prop]['num'].substr(2) == depotId) {
                return prop;
            }
        }
    } else {
        for(var prop in vehicles_info) {
            if(vehicles_info[prop]['num'] == depotId) {
                return prop;
            }
        }
    }
}

 index.js

@@ -1,3 +1,5 @@
"use strict";

var ttss_refresh = 20000; // 20 seconds

var page_title = document.getElementsByTagName('title')[0];

 map.html

@@ -17,7 +17,7 @@
<script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList"></script>
<script src="https://cdn.jsdelivr.net/gh/openlayers/openlayers.github.io@master/en/v5.3.0/build/ol.js" integrity="sha384-iQkGyyH4ioz3m+maM3s9MX1Oq67mACa4B9Z3ovUv3Sv37LJ96fx3WnZfLoiC3Wfl" crossorigin="anonymous"></script>
<script tyle="text/javascript" src="lang_pl.js?v3" id="lang_script"></script>
<script tyle="text/javascript" src="common.js?v4"></script>
<script tyle="text/javascript" src="map.js?v6"></script>
<script tyle="text/javascript" src="common.js?v5"></script>
<script tyle="text/javascript" src="map.js?v7"></script>
</body>
</html>

 map.js

@@ -1,3 +1,5 @@
"use strict";

var ttss_refresh = 10000; // 10 seconds
var ttss_position_type = 'CORRECTED';

@@ -16,13 +18,19 @@
var vehicles_info = {};

var stops_xhr = null;
var stops_source = null;
var stops_layer = null;
var stop_points_source = null;
var stop_points_layer = null;
var stops_buses_source = null;
var stops_buses_layer = null;
var stops_trams_source = null;
var stops_trams_layer = null;
var stop_points_buses_source = null;
var stop_points_buses_layer = null;
var stop_points_trams_source = null;
var stop_points_trams_layer = null;

var stop_selected_source = null;
var stop_selected_layer = null;

var feature_clicked = null;
var feature_selected = [];
var feature_xhr = null;
var feature_timer = null;

@@ -94,7 +102,7 @@
    
    var image = '<svg xmlns="http://www.w3.org/2000/svg" height="30" width="20"><polygon points="10,0 20,23 0,23" style="fill:'+fill+';stroke:'+color_type+';stroke-width:3" /></svg>';
    
    return new ol.style.Style({
    vehicle.setStyle(new ol.style.Style({
        image: new ol.style.Icon({
            src: 'data:image/svg+xml;base64,' + btoa(image),
            rotation: Math.PI * parseFloat(vehicle.get('heading') ? vehicle.get('heading') : 0) / 180.0,
@@ -104,67 +112,61 @@
            text: vehicle.get('line'),
            fill: new ol.style.Fill({color: 'white'}),
        }),
    });
    }));
}

function styleStop(stop, selected) {
    var fill = '#FA0';
    var stroke = '#B70';
    var stroke_selected = '#F00';
    var stroke_width = 1;
    var radius = 3;
function markStops(stops, type, routeStyle) {
    stop_selected_source.clear();
    
    if(stop.get('category') == 'bus') {
        fill = '#07F';
        stroke = '#05B';
    var style = stops_trams_layer.getStyle();
    if(type == 'b') {
        style = stops_buses_layer.getStyle();
    }
    style = style.clone();
	
    if(routeStyle) {
        style.getImage().setRadius(5);
    } else {
        style.getImage().getStroke().setWidth(2);
        style.getImage().getStroke().setColor('#F00');
        style.getImage().setRadius(5);
    }
    
    if(selected == 2) {
        radius = 5;
    } else if(selected) {
        stroke = stroke_selected;
        stroke_width = 2;
        radius = 5;
    stop_selected_layer.setStyle(style);
	
    var feature = null;
    var prefix = null;
    for(var i = 0; i < stops.length; i++) {
        feature = null;
        if(stops[i].getId) {
            feature = stops[i];
        } else {
            prefix = stops[i].substr(0,2);
            feature = null;
            if(prefix == 'sb') {
                feature = stops_buses_source.getFeatureById(stops[i]);
            } else if(prefix == 'st') {
                feature = stops_trams_source.getFeatureById(stops[i]);
            } else if(prefix == 'pb') {
                feature = stop_points_buses_source.getFeatureById(stops[i]);
            } else if(prefix == 'pt') {
                feature = stop_points_trams_source.getFeatureById(stops[i]);
            }
        }
        if(feature) {
            stop_selected_source.addFeature(feature);
        }
    }
    
    return new ol.style.Style({
        image: new ol.style.Circle({
            fill: new ol.style.Fill({color: fill}),
            stroke: new ol.style.Stroke({color: stroke, width: stroke_width}),
            radius: radius,
        }),
    });
}

function styleFeature(feature, selected) {
    if(!feature) return;
    if(!feature.getId()) return;
	
    var style = null;
	
    switch(feature.getId().substr(0, 1)) {
        case 't':
        case 'b':
            style = styleVehicle(feature, selected);
        break;
		
        case 's':
        case 'p':
            style = styleStop(feature, selected);
        break;
    }
	
    feature.setStyle(style);
    if(selected) {
        feature_selected.push(feature);
    }
    stop_selected_layer.setVisible(true);
}

function unstyleSelectedFeatures() {
    for(var i = 0; i < feature_selected.length; i++) {
        styleFeature(feature_selected[i]);
    stop_selected_source.clear();
    route_source.clear();
    if(feature_clicked && (feature_clicked.getId().startsWith('t') || feature_clicked.getId().startsWith('b'))) {
        styleVehicle(feature_clicked);
    }
    feature_selected = [];
}

function updateTrams() {
@@ -206,7 +208,7 @@
                vehicle_feature = new ol.Feature(vehicle);
                vehicle_feature.setId('t' + vehicle.id);
                
                styleFeature(vehicle_feature);
                styleVehicle(vehicle_feature);
                trams_source.addFeature(vehicle_feature);
            } else {
                vehicle_feature.setProperties(vehicle);
@@ -262,7 +264,7 @@
                vehicle_feature = new ol.Feature(vehicle);
                vehicle_feature.setId('b' + vehicle.id);
                
                styleFeature(vehicle_feature);
                styleVehicle(vehicle_feature);
                buses_source.addFeature(vehicle_feature);
            } else {
                vehicle_feature.setProperties(vehicle);
@@ -288,13 +290,12 @@
        var stop_feature = new ol.Feature(stop);
        
        stop_feature.setId(prefix + stop.id);
        styleFeature(stop_feature);
        
        source.addFeature(stop_feature);
    }
}

function updateStops(base, suffix) {
function updateStops(base, suffix, source) {
    return $.get(
        base + '/geoserviceDispatcher/services/stopinfo/stops'
            + '?left=-648000000'
@@ -302,11 +303,11 @@
            + '&right=648000000'
            + '&top=324000000'
    ).done(function(data) {
        updateStopSource(data.stops, 's' + suffix, stops_source);
        updateStopSource(data.stops, 's' + suffix, source);
    }).fail(fail_ajax);
}

function updateStopPoints(base, suffix) {
function updateStopPoints(base, suffix, source) {
    return $.get(
        base + '/geoserviceDispatcher/services/stopinfo/stopPoints'
            + '?left=-648000000'
@@ -314,7 +315,7 @@
            + '&right=648000000'
            + '&top=324000000'
    ).done(function(data) {
        updateStopSource(data.stopPoints, 'p' + suffix, stop_points_source);
        updateStopSource(data.stopPoints, 'p' + suffix, source);
    }).fail(fail_ajax);
}

@@ -349,21 +350,22 @@
            table.appendChild(tr);
        }
        
        unstyleSelectedFeatures();
        styleFeature(feature_clicked, true);
        var stopsToMark = [];
        
        for(var i = 0, il = data.actual.length; i < il; i++) {
            var tr = document.createElement('tr');
            addCellWithText(tr, data.actual[i].actualTime || data.actual[i].plannedTime);
            addCellWithText(tr, data.actual[i].stop_seq_num + '. ' + data.actual[i].stop.name);
            
            styleFeature(stops_source.getFeatureById('s' + data.actual[i].stop.id), 2);
            stopsToMark.push('s' + featureId.substr(0,1) + data.actual[i].stop.id);
            
            if(data.actual[i].status == 'STOPPING') {
                tr.className = 'success';
            }
            table.appendChild(tr);
        }
		
        markStops(stopsToMark, featureId.substr(0,1), true);
        
        feature_timer = setTimeout(function() { vehicleTable(tripId, table, featureId); }, ttss_refresh);
        
@@ -388,6 +390,7 @@
            route_source.addFeature(new ol.Feature({
                geometry: new ol.geom.LineString(points)
            }));
            route_layer.setVisible(true);
        });
    }).fail(fail_ajax_popup);
}
@@ -479,7 +482,6 @@
    if(feature && !feature.getId()) return;
    
    unstyleSelectedFeatures();
    route_source.clear();
    
    if(!feature) {
        hidePanel();
@@ -521,6 +523,8 @@
            addElementWithText(thead, 'th', lang.header_stop);
            
            vehicleTable(feature.get('tripId'), tbody, feature.getId());
			
            styleVehicle(feature, true);
        break;
        case 's':
            type = lang.type_stop_tram;
@@ -534,6 +538,7 @@
            addElementWithText(thead, 'th', lang.header_delay);
            
            stopTable('stop', feature.get('shortName'), tbody, feature.getId());
            markStops([feature], feature.getId().substr(1,1));
        break;
        case 'p':
            type = lang.type_stoppoint_tram;
@@ -560,6 +565,7 @@
            addElementWithText(thead, 'th', lang.header_delay);
            
            stopTable('stopPoint', feature.get('stopPoint'), tbody, feature.getId());
            markStops([feature], feature.getId().substr(1,1));
        break;
    }
    
@@ -576,8 +582,6 @@
    
    div.appendChild(table);
    
    styleFeature(feature, true);
	
    setTimeout(function () {map.getView().animate({
        center: feature.getGeometry().getCoordinates(),
    }) }, 10);
@@ -592,7 +596,6 @@
            
            feature_clicked = null;
            unstyleSelectedFeatures();
            route_source.clear();
            
            if(feature_xhr) feature_xhr.abort();
            if(feature_timer) clearTimeout(feature_timer);
@@ -608,45 +611,44 @@
        return;
    }
    
    var depotId = null;
	
    var tramId = null;
    var busId = null;
    var stopId = null;
    var stopPointId = null;
	
    var feature = null;
    var vehicleId = null;
    var stopId = null;
    
    if(window.location.hash.match(/^#!t[0-9]{3}$/)) {
        depotId = parseInt(window.location.hash.substr(3));
        vehicleId = depotIdToVehicleId(window.location.hash.substr(3), 't');
    } else if(window.location.hash.match(/^#!b[0-9]{3}$/)) {
        vehicleId = depotIdToVehicleId(window.location.hash.substr(3), 'b');
    } else if(window.location.hash.match(/^#![A-Za-z]{2}[0-9]{3}$/)) {
        depotId = parseInt(window.location.hash.substr(4));
        vehicleId = depotIdToVehicleId(window.location.hash.substr(2));
    } else if(window.location.hash.match(/^#!v-?[0-9]+$/)) {
        tramId = window.location.hash.substr(3);
    } else if(window.location.hash.match(/^#!t-?[0-9]+$/)) {
        tramId = window.location.hash.substr(3);
    } else if(window.location.hash.match(/^#!b-?[0-9]+$/)) {
        busId = window.location.hash.substr(3);
    } else if(window.location.hash.match(/^#!s[0-9]+$/)) {
        stopId = window.location.hash.substr(3);
    } else if(window.location.hash.match(/^#!p-?[0-9]+$/)) {
        stopPointId = window.location.hash.substr(3);
        vehicleId = 't' + window.location.hash.substr(3);
    } else if(window.location.hash.match(/^#![tb]-?[0-9]+$/)) {
        vehicleId = window.location.hash.substr(2);
    } else if(window.location.hash.match(/^#![sp]-?[0-9]+$/)) {
        stopId = window.location.hash.substr(2,1) + 't' + window.location.hash.substr(3);
    } else if(window.location.hash.match(/^#![sp][tb]-?[0-9]+$/)) {
        stopId = window.location.hash.substr(2);
    } else if(window.location.hash == '#!RAW') {
        ttss_position_type = 'RAW';
    }
    
    if(depotId) {
        tramId = tramIdToVehicleId(depotId);
    }
	
    if(tramId) {
        feature = trams_source.getFeatureById('t' + tramId);
    } else if(busId) {
        feature = buses_source.getFeatureById('b' + busId);
    if(vehicleId) {
        if(vehicleId.startsWith('b')) {
            feature = buses_source.getFeatureById(vehicleId);
        } else {
            feature = trams_source.getFeatureById(vehicleId);
        }
    } else if(stopId) {
        feature = stops_source.getFeatureById('s' + stopId);
    } else if(stopPointId) {
        feature = stop_points_source.getFeatureById('p' + stopPointId);
        if(stopId.startsWith('st')) {
            feature = stops_trams_source.getFeatureById(stopId);
        } else if(stopId.startsWith('sb')) {
            feature = stops_buses_source.getFeatureById(stopId);
        } else if(stopId.startsWith('pt')) {
            feature = stop_points_trams_source.getFeatureById(stopId);
        } else if(stopId.startsWith('pb')) {
            feature = stop_points_buses_source.getFeatureById(stopId);
        }
    }
    
    featureClicked(feature);
@@ -683,18 +685,73 @@
        timeout: 10000,
    });
    
    stops_source = new ol.source.Vector({
    stops_buses_source = new ol.source.Vector({
        features: [],
    });
    stops_layer = new ol.layer.Vector({
        source: stops_source,
    stops_buses_layer = new ol.layer.Vector({
        source: stops_buses_source,
        renderMode: 'image',
        style: new ol.style.Style({
            image: new ol.style.Circle({
                fill: new ol.style.Fill({color: '#07F'}),
                stroke: new ol.style.Stroke({color: '#05B', width: 1}),
                radius: 3,
            }),
        }),
    });
    
    stop_points_source = new ol.source.Vector({
    stops_trams_source = new ol.source.Vector({
        features: [],
    });
    stop_points_layer = new ol.layer.Vector({
        source: stop_points_source,
    stops_trams_layer = new ol.layer.Vector({
        source: stops_trams_source,
        renderMode: 'image',
        style: new ol.style.Style({
            image: new ol.style.Circle({
                fill: new ol.style.Fill({color: '#FA0'}),
                stroke: new ol.style.Stroke({color: '#B70', width: 1}),
                radius: 3,
            }),
        }),
    });
	
    stop_points_buses_source = new ol.source.Vector({
        features: [],
    });
    stop_points_buses_layer = new ol.layer.Vector({
        source: stop_points_buses_source,
        renderMode: 'image',
        visible: false,
        style: new ol.style.Style({
            image: new ol.style.Circle({
                fill: new ol.style.Fill({color: '#07F'}),
                stroke: new ol.style.Stroke({color: '#05B', width: 2}),
                radius: 3,
            }),
        }),
    });
	
    stop_points_trams_source = new ol.source.Vector({
        features: [],
    });
    stop_points_trams_layer = new ol.layer.Vector({
        source: stop_points_trams_source,
        renderMode: 'image',
        visible: false,
        style: new ol.style.Style({
            image: new ol.style.Circle({
                fill: new ol.style.Fill({color: '#FA0'}),
                stroke: new ol.style.Stroke({color: '#B70', width: 2}),
                radius: 3,
            }),
        }),
    });
	
    stop_selected_source = new ol.source.Vector({
        features: [],
    });
    stop_selected_layer = new ol.layer.Vector({
        source: stop_selected_source,
        visible: false,
    });
    
@@ -729,14 +786,17 @@
                source: new ol.source.OSM()
            }),
            route_layer,
            stops_layer,
            stop_points_layer,
            stops_buses_layer,
            stops_trams_layer,
            stop_points_buses_layer,
            stop_points_trams_layer,
            stop_selected_layer,
            buses_layer,
            trams_layer,
        ],
        view: new ol.View({
            center: ol.proj.fromLonLat([19.94, 50.06]),
            zoom: 13
            zoom: 14
        }),
        controls: ol.control.defaults({
            attributionOptions: ({
@@ -750,16 +810,21 @@
                element: fail_element,
            })
        ]),
        loadTilesWhileAnimating: true,
        loadTilesWhileAnimating: false,
    });
    
    // Display popup on click
    map.on('singleclick', function(e) {
        var point = e.coordinate;
        var features = [];
        map.forEachFeatureAtPixel(e.pixel, function(feature) { if(feature.getId()) features.push(feature); });
        map.forEachFeatureAtPixel(e.pixel, function(feature, layer) {
            if(layer == stop_selected_layer) return;
            if(feature.getId()) features.push(feature);
        });
        
        if(features.length > 1) {
            featureClicked();
			
            var div = document.createElement('div');
            
            addParaWithText(div, lang.select_feature);
@@ -814,11 +879,17 @@
        
        var feature = features[0];
        if(!feature) {
            if(stops_layer.getVisible()) {
                feature = returnClosest(point, feature, stops_source.getClosestFeatureToCoordinate(point));
            if(stops_buses_layer.getVisible()) {
                feature = returnClosest(point, feature, stops_buses_source.getClosestFeatureToCoordinate(point));
            }
            if(stop_points_layer.getVisible()) {
                feature = returnClosest(point, feature, stop_points_source.getClosestFeatureToCoordinate(point));
            if(stops_trams_layer.getVisible()) {
                feature = returnClosest(point, feature, stops_trams_source.getClosestFeatureToCoordinate(point));
            }
            if(stop_points_buses_layer.getVisible()) {
                feature = returnClosest(point, feature, stop_points_buses_source.getClosestFeatureToCoordinate(point));
            }
            if(stop_points_trams_layer.getVisible()) {
                feature = returnClosest(point, feature, stop_points_trams_source.getClosestFeatureToCoordinate(point));
            }
            if(trams_layer.getVisible()) {
                feature = returnClosest(point, feature, trams_source.getClosestFeatureToCoordinate(point));
@@ -827,7 +898,7 @@
                feature = returnClosest(point, feature, buses_source.getClosestFeatureToCoordinate(point));
            }
            
            if(getDistance(point, feature) > 200) {
            if(getDistance(point, feature) > map.getView().getResolution() * 20) {
                feature = null;
            }
        }
@@ -848,17 +919,18 @@
    
    // Change layer visibility on zoom
    map.getView().on('change:resolution', function(e) {
        stop_points_layer.setVisible(map.getView().getZoom() >= 16);
        stop_points_buses_layer.setVisible(map.getView().getZoom() >= 16);
        stop_points_trams_layer.setVisible(map.getView().getZoom() >= 16);
    });
    
    $.when(
        updateVehicleInfo(),
        updateTrams(),
        updateBuses(),
        updateStops(ttss_trams_base, 't'),
        updateStops(ttss_buses_base, 'b'),
        updateStopPoints(ttss_trams_base, 't'),
        updateStopPoints(ttss_buses_base, 'b'),
        updateStops(ttss_trams_base, 't', stops_trams_source),
        updateStops(ttss_buses_base, 'b', stops_buses_source),
        updateStopPoints(ttss_trams_base, 't', stop_points_trams_source),
        updateStopPoints(ttss_buses_base, 'b', stop_points_buses_source),
    ).done(function() {
        hash();
    });