248 lines
7.0 KiB
Go
248 lines
7.0 KiB
Go
package main
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import (
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"math/rand"
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"strconv"
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"sync"
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"time"
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"github.com/ryanhamamura/via"
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"github.com/ryanhamamura/via/h"
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"github.com/ryanhamamura/via/maplibre"
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)
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type posMsg struct {
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Lng float64 `json:"lng"`
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Lat float64 `json:"lat"`
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}
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var (
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vehicleOnce sync.Once
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vehicle struct {
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mu sync.RWMutex
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lng, lat float64
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}
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)
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func main() {
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v := via.New()
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v.Config(via.Options{
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DocumentTitle: "MapLibre GL Example",
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ServerAddress: ":7331",
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DevMode: true,
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Plugins: []via.Plugin{maplibre.Plugin},
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})
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// Single goroutine moves the vehicle — all clients read the same position.
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vehicle.lng = -122.43
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vehicle.lat = 37.77
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vehicleOnce.Do(func() {
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go func() {
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for {
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time.Sleep(time.Second)
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vehicle.mu.Lock()
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vehicle.lng = -122.43 + (rand.Float64()-0.5)*0.02
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vehicle.lat = 37.77 + (rand.Float64()-0.5)*0.02
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vehicle.mu.Unlock()
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}
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}()
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})
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v.Page("/", func(c *via.Context) {
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m := maplibre.New(c, maplibre.Options{
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Style: "https://demotiles.maplibre.org/style.json",
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Center: maplibre.LngLat{Lng: -122.4194, Lat: 37.7749},
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Zoom: 10,
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Height: "500px",
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})
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m.AddControl("nav", maplibre.NavigationControl{})
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m.AddControl("scale", maplibre.ScaleControl{Unit: "metric"})
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// Static markers with popups
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m.AddMarker("sf", maplibre.Marker{
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LngLat: maplibre.LngLat{Lng: -122.4194, Lat: 37.7749},
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Color: "#e74c3c",
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Popup: &maplibre.Popup{
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Content: "<strong>San Francisco</strong><p>The Golden City</p>",
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},
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})
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m.AddMarker("oak", maplibre.Marker{
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LngLat: maplibre.LngLat{Lng: -122.2711, Lat: 37.8044},
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Color: "#2ecc71",
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Popup: &maplibre.Popup{
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Content: "<strong>Oakland</strong>",
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},
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})
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// Custom SVG container ship marker (static)
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m.AddMarker("ship", maplibre.Marker{
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LngLat: maplibre.LngLat{Lng: -122.38, Lat: 37.80},
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Element: `<svg width="48" height="48" viewBox="0 0 64 64" xmlns="http://www.w3.org/2000/svg">` +
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// hull
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`<path d="M4 42 L12 54 L52 54 L60 42 Z" fill="#1b3a5c" stroke="#0e2340" stroke-width="1"/>` +
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// deck
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`<rect x="14" y="36" width="36" height="6" rx="1" fill="#2c5f8a"/>` +
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// containers row 1
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`<rect x="16" y="26" width="7" height="10" rx="0.5" fill="#e74c3c"/>` +
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`<rect x="24" y="26" width="7" height="10" rx="0.5" fill="#2ecc71"/>` +
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`<rect x="32" y="26" width="7" height="10" rx="0.5" fill="#f39c12"/>` +
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`<rect x="40" y="26" width="7" height="10" rx="0.5" fill="#3498db"/>` +
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// containers row 2
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`<rect x="20" y="17" width="7" height="9" rx="0.5" fill="#e67e22"/>` +
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`<rect x="28" y="17" width="7" height="9" rx="0.5" fill="#1abc9c"/>` +
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`<rect x="36" y="17" width="7" height="9" rx="0.5" fill="#e74c3c"/>` +
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// bridge
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`<rect x="8" y="22" width="7" height="14" rx="1" fill="#d5dfe8" stroke="#2c5f8a" stroke-width="0.5"/>` +
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`<rect x="9" y="23" width="5" height="4" rx="0.5" fill="#85c1e9"/>` +
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// funnel
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`<rect x="9" y="14" width="5" height="8" rx="0.5" fill="#1b3a5c"/>` +
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`<rect x="8.5" y="12" width="6" height="3" rx="0.5" fill="#e74c3c"/>` +
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`</svg>`,
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Anchor: "center",
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Rotation: 45,
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Popup: &maplibre.Popup{
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Content: "<strong>MSC Adriatica</strong><p>Container vessel — heading NE</p>",
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},
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})
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// Custom SVG vehicle marker — reads shared Go state
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vehicleLng := c.Signal(-122.43)
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vehicleLat := c.Signal(37.77)
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m.AddMarker("vehicle", maplibre.Marker{
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LngSignal: vehicleLng,
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LatSignal: vehicleLat,
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Element: `<svg width="20" height="20" viewBox="0 0 20 20" xmlns="http://www.w3.org/2000/svg">` +
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`<circle cx="10" cy="10" r="9" fill="#9b59b6" stroke="#fff" stroke-width="2"/>` +
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`</svg>`,
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Anchor: "center",
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})
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c.OnInterval(time.Second, func() {
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vehicle.mu.RLock()
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lng, lat := vehicle.lng, vehicle.lat
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vehicle.mu.RUnlock()
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vehicleLng.SetValue(lng)
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vehicleLat.SetValue(lat)
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c.SyncSignals()
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})
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// Yellow click marker — synced across clients via PubSub
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clickLng := c.Signal(-122.4194)
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clickLat := c.Signal(37.7749)
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m.AddMarker("clicked", maplibre.Marker{
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LngSignal: clickLng,
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LatSignal: clickLat,
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Color: "#f39c12",
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})
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via.Subscribe(c, "map.click", func(msg posMsg) {
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clickLng.SetValue(msg.Lng)
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clickLat.SetValue(msg.Lat)
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c.SyncSignals()
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})
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click := m.OnClick()
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handleClick := c.Action(func() {
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e := click.Data()
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via.Publish(c, "map.click", posMsg{Lng: e.LngLat.Lng, Lat: e.LngLat.Lat})
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})
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// Blue draggable pin — synced across clients via PubSub
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pinLng := c.Signal(-122.41)
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pinLat := c.Signal(37.78)
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m.AddMarker("pin", maplibre.Marker{
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LngSignal: pinLng,
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LatSignal: pinLat,
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Color: "#3498db",
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Draggable: true,
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})
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via.Subscribe(c, "map.pin", func(msg posMsg) {
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pinLng.SetValue(msg.Lng)
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pinLat.SetValue(msg.Lat)
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c.SyncSignals()
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})
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handlePinDrag := c.Action(func() {
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lng, _ := strconv.ParseFloat(pinLng.String(), 64)
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lat, _ := strconv.ParseFloat(pinLat.String(), 64)
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via.Publish(c, "map.pin", posMsg{Lng: lng, Lat: lat})
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})
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// GeoJSON polygon source + fill layer
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m.AddSource("park", maplibre.GeoJSONSource{
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Data: map[string]any{
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"type": "Feature",
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"geometry": map[string]any{
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"type": "Polygon",
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"coordinates": []any{[]any{
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[]float64{-122.4547, 37.7654},
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[]float64{-122.4547, 37.7754},
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[]float64{-122.4387, 37.7754},
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[]float64{-122.4387, 37.7654},
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[]float64{-122.4547, 37.7654},
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}},
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},
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"properties": map[string]any{
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"name": "Golden Gate Park",
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},
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},
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})
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m.AddLayer(maplibre.Layer{
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ID: "park-fill",
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Type: "fill",
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Source: "park",
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Paint: map[string]any{
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"fill-color": "#2ecc71",
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"fill-opacity": 0.3,
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},
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})
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// FlyTo actions
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zoom14 := 14.0
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flyToSF := c.Action(func() {
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m.FlyTo(maplibre.CameraOptions{
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Center: &maplibre.LngLat{Lng: -122.4194, Lat: 37.7749},
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Zoom: &zoom14,
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})
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})
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flyToOak := c.Action(func() {
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m.FlyTo(maplibre.CameraOptions{
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Center: &maplibre.LngLat{Lng: -122.2711, Lat: 37.8044},
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Zoom: &zoom14,
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})
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})
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c.View(func() h.H {
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return h.Div(
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h.Div(
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h.Attr("style", "max-width:960px;margin:0 auto;padding:1rem;font-family:sans-serif"),
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h.H1(h.Text("MapLibre GL Example")),
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m.Element(
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click.Input(handleClick.OnInput()),
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h.Input(h.Type("hidden"), pinLng.Bind(), handlePinDrag.OnInput()),
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),
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h.Div(h.Attr("style", "margin-top:1rem;display:flex;gap:0.5rem;flex-wrap:wrap"),
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h.Button(h.Text("Fly to San Francisco"), flyToSF.OnClick()),
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h.Button(h.Text("Fly to Oakland"), flyToOak.OnClick()),
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),
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h.Div(h.Attr("style", "margin-top:0.5rem;font-size:0.9rem"),
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h.P(h.Text("Zoom: "), m.Zoom.Text()),
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h.P(h.Text("Center: "), m.CenterLng.Text(), h.Text(", "), m.CenterLat.Text()),
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h.P(h.Text("Click: "), clickLng.Text(), h.Text(", "), clickLat.Text()),
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h.P(h.Text("Vehicle: "), vehicleLng.Text(), h.Text(", "), vehicleLat.Text()),
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h.P(h.Text("Draggable Pin: "), pinLng.Text(), h.Text(", "), pinLat.Text()),
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),
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),
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)
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})
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})
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v.Start()
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}
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