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shiny_server.R
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shiny_server.R
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# the app logic
server <- function(input, output, session) {
filtered_data <- eventReactive(input$update, {
req(input$year)
if (input$single_species) {
req(input$species_single)
result <- grid_data %>%
dplyr::filter(
species == input$species_single,
year == input$year
)
} else {
req(input$species1, input$species2)
result <- grid_data %>%
dplyr::filter(
species %in% c(input$species1, input$species2),
year == input$year
)
}
result
})
output$map <- renderLeaflet({
leaflet(options = leafletOptions(zoomControl = FALSE)) %>%
addTiles(
urlTemplate = "https://server.arcgisonline.com/ArcGIS/rest/services/Ocean/World_Ocean_Base/MapServer/tile/{z}/{y}/{x}",
attribution = "Tiles © Esri — Sources: GEBCO, NOAA, CHS, OSU, UNH, CSUMB, National Geographic, DeLorme, NAVTEQ, and Esri"
) %>%
addTiles(
urlTemplate = "https://server.arcgisonline.com/ArcGIS/rest/services/Ocean/World_Ocean_Reference/MapServer/tile/{z}/{y}/{x}",
attribution = "Tiles © Esri — Sources: GEBCO, NOAA, CHS, OSU, UNH, CSUMB, National Geographic, DeLorme, NAVTEQ, and Esri"
) %>%
addPolygons(
data = neafc_areas,
fillColor = "transparent",
color = "black",
weight = 2,
opacity = 1,
fillOpacity = 0,
group = "NEAFC Areas"
) %>%
addGraticule(interval = 10, style = list(color = "#999", weight = 0.5, opacity = 0.5)) %>%
addGraticule(interval = 5, style = list(color = "#999", weight = 0.25, opacity = 0.3)) %>%
onRender("
function(el, x) {
console.log('Map render function called');
L.control.zoom({position:'topright'}).addTo(this);
// Create labels for coordinates
var latLabelTop = L.DomUtil.create('div', 'coordinate-labels lat-label-top');
var latLabelBottom = L.DomUtil.create('div', 'coordinate-labels lat-label-bottom');
var lonLabelLeft = L.DomUtil.create('div', 'coordinate-labels lon-label-left');
var lonLabelRight = L.DomUtil.create('div', 'coordinate-labels lon-label-right');
el.appendChild(latLabelTop);
el.appendChild(latLabelBottom);
el.appendChild(lonLabelLeft);
el.appendChild(lonLabelRight);
console.log('Labels created');
// Function to update coordinate labels
function updateCoordinateLabels() {
var bounds = this.getBounds();
var northLat = bounds.getNorth().toFixed(2);
var southLat = bounds.getSouth().toFixed(2);
var westLon = bounds.getWest().toFixed(2);
var eastLon = bounds.getEast().toFixed(2);
latLabelTop.innerHTML = Math.abs(northLat) + '°' + (northLat >= 0 ? 'N' : 'S');
latLabelBottom.innerHTML = Math.abs(southLat) + '°' + (southLat >= 0 ? 'N' : 'S');
lonLabelLeft.innerHTML = Math.abs(westLon) + '°' + (westLon >= 0 ? 'E' : 'W');
lonLabelRight.innerHTML = Math.abs(eastLon) + '°' + (eastLon >= 0 ? 'E' : 'W');
console.log('Updating labels:', northLat, southLat, westLon, eastLon);
}
// Update labels on initial load and whenever the map moves
this.on('load moveend', updateCoordinateLabels);
// Initial update
updateCoordinateLabels.call(this);
}")
})
observe({
req(input$update)
data <- filtered_data()
if (input$single_species) {
if (nrow(data) == 0 || all(is.na(data$total_catch))) {
leafletProxy("map") %>%
clearGroup("Catches") %>%
clearControls()
} else {
valid_data <- data %>%
dplyr::filter(!is.na(total_catch), total_catch > 0)
if (nrow(valid_data) > 0) {
pal <- colorNumeric("viridis", domain = range(valid_data$total_catch))
leafletProxy("map") %>%
clearGroup("Catches") %>%
clearControls() %>%
addRectangles(
data = valid_data,
lng1 = ~lon_bin, lat1 = ~lat_bin,
lng2 = ~ lon_bin + 0.05, lat2 = ~ lat_bin + 0.05,
fillColor = ~ pal(total_catch),
color = "transparent",
weight = 0,
opacity = 1,
fillOpacity = 0.7,
popup = ~ paste(species, ": ", round(total_catch, 2), " kg"),
group = "Catches"
) %>%
addLegend(
position = "bottomright",
pal = pal,
values = valid_data$total_catch,
title = paste(input$species_single, "Catch -", input$year),
opacity = 1
)
} else {
leafletProxy("map") %>%
clearGroup("Catches") %>%
clearControls()
}
}
} else {
data1 <- data %>% dplyr::filter(species == input$species1)
data2 <- data %>% dplyr::filter(species == input$species2)
if (nrow(data1) == 0 && nrow(data2) == 0) {
leafletProxy("map") %>%
clearGroup("Catches") %>%
clearControls() %>%
addLegend("bottomright",
colors = "gray",
labels = "No data",
title = paste("No data for", input$year),
opacity = 1
)
} else {
combined_data <- dplyr::full_join(
data1 %>% dplyr::select(lon_bin, lat_bin, catch1 = total_catch),
data2 %>% dplyr::select(lon_bin, lat_bin, catch2 = total_catch),
by = c("lon_bin", "lat_bin")
) %>%
tidyr::replace_na(list(catch1 = 0, catch2 = 0)) %>%
dplyr::mutate(color = get_cell_color(catch1, catch2))
leafletProxy("map") %>%
clearGroup("Catches") %>%
addRectangles(
data = combined_data,
lng1 = ~lon_bin, lat1 = ~lat_bin,
lng2 = ~ lon_bin + 0.05, lat2 = ~ lat_bin + 0.05,
fillColor = ~color,
color = "transparent",
weight = 0,
opacity = 1,
fillOpacity = 0.7,
popup = ~ paste(
input$species1, ": ", round(catch1, 2), " kg<br>",
input$species2, ": ", round(catch2, 2), " kg"
),
group = "Catches"
) %>%
clearControls() %>%
addLegend("bottomright",
colors = c("red", "blue", "purple"),
labels = c(input$species1, input$species2, "Both species"),
title = paste("Species Presence -", input$year),
opacity = 1
)
}
}
})
}