Struct Map 

pub struct Map {
    pub settings: MapSettings,
    /* private fields */
}

An interactive 2D map widget.

Map renders a set of nodes (objects::MapPoint), connection lines (objects::MapSegment) and text labels (objects::MapLabel). The user can pan the view by dragging and zoom with the mouse wheel (hold Ctrl — or Cmd on macOS — to zoom faster), or use the built-in zoom slider drawn at the top-right corner of the widget.

The map is fed through Map::add_hashmap_points, which also builds the internal kd-tree used for viewport culling and nearest-node hover queries. Behavior and appearance are configured through the public settings field (see objects::MapSettings).

Rendering of nodes and their visual effects (selection highlight, notifications and markers) can be fully customized by installing a objects::NodeTemplate implementation with Map::set_node_template; likewise, a right-click context menu can be provided with Map::set_context_manager.

Examples

use egui_map::map::Map;
use egui_map::map::objects::{MapPoint, RawPoint};
use std::collections::HashMap;

let mut points = HashMap::new();
points.insert(1, MapPoint::new(1, RawPoint::new(0.0, 0.0)));

let mut map = Map::new();
map.add_hashmap_points(points);

// Every frame, inside your egui update logic:
ui.add(&mut map);

Fields

settings: MapSettings

Behavior and appearance configuration (zoom limits, visibility thresholds and per-theme styles). See objects::MapSettings.

Implementations

impl Map

pub fn new() -> Self

Creates an empty map widget with default MapSettings.

The widget displays nothing until nodes are loaded with Map::add_hashmap_points.

pub fn add_hashmap_points(&mut self, hash_map: HashMap<usize, MapPoint>)

Loads the node set and (re)builds the spatial index.

This replaces any previously loaded points, computes the bounding box of the whole set, centers the view on its midpoint and refreshes the list of visible nodes. It must be called at least once before the widget can display anything.

The kd-tree built here is what enables viewport culling and nearest-neighbor hover lookups, so calling this method on every frame is discouraged; call it only when the node set changes.

Examples

use egui_map::map::Map;
use egui_map::map::objects::{MapPoint, RawPoint};
use std::collections::HashMap;

let mut points = HashMap::new();
points.insert(1, MapPoint::new(1, RawPoint::new(0.0, 0.0)));
points.insert(2, MapPoint::new(2, RawPoint::new(10.0, 10.0)));

let mut map = Map::new();
map.add_hashmap_points(points);

// The view is centered on the midpoint of the loaded nodes.
assert_eq!(map.get_pos(), [5.0, 5.0]);

pub fn set_pos_from_nodeid(&mut self, node_id: usize)

Centers the view on the node with the given id.

Does nothing if no points have been loaded yet or if node_id is unknown.

pub fn set_pos(&mut self, position: [f32; 2])

Centers the view on the given map coordinates.

pub fn get_pos(&self) -> [f32; 2]

Returns the map coordinates the view is currently centered on.

pub fn add_labels(&mut self, labels: Vec<MapLabel>)

Replaces the set of free-floating text labels drawn on the map.

Labels are only rendered while the zoom level is below MapSettings::line_visible_zoom.

pub fn add_lines(&mut self, lines: HashMap<String, RawLine>)

Replaces the set of connection lines between nodes.

Lines are keyed by a connection id that the endpoint nodes must reference through MapPoint::connections — push each line’s key into the connections of the nodes it joins. The segments are stored in an R-tree keyed by bounding box: a line is drawn while its bounding box intersects the viewport and the zoom level is above MapSettings::line_visible_zoom.

See the module-level example for the complete wiring.

pub fn set_zoom(&mut self, value: f32)

Sets the zoom factor.

Values outside the MapSettings::min_zoom..=MapSettings::max_zoom range are ignored.

pub fn get_zoom(&mut self) -> f32

Returns the current zoom factor.

pub fn notify(&mut self, id_node: usize, time: Instant)

Triggers a notification highlight on the node id_node.

By default the notification is rendered as a pulsing circle that starts at time and plays for about 3.5 seconds; calling notify again for the same node restarts the animation. The effect can be customized with objects::NodeTemplate::notification_ui.

pub fn line_at(&self, point: [f32; 2], tolerance: f32) -> Option<Rc<str>>

Returns the id of the line closest to point, in map coordinates, when it lies within tolerance map units of the segment.

Broad-phase candidates are taken from the segment R-tree built by Map::add_lines; the exact point-to-segment distance is then computed against the line geometry and the closest match wins. Returns None when no lines are loaded or every segment is farther than tolerance. A negative tolerance behaves like 0.0.

To hit-test a mouse click, convert the screen position to map coordinates first (map = (screen + origin) / zoom, see the coordinate model) and pick a tolerance scaled by 1.0 / zoom so it stays constant in screen pixels.

pub fn set_context_manager(&mut self, manager: Rc<dyn ContextMenuManager>)

Installs a right-click context menu whose contents are built by the given ContextMenuManager implementation.

pub fn set_node_template(&mut self, template: Rc<dyn NodeTemplate>)

Replaces the built-in node rendering with a custom NodeTemplate implementation.

The template takes over the drawing of nodes, selection highlights, notification animations and markers — including the node name labels, which the widget no longer draws once a template is installed. See the NodeTemplate examples for custom shapes and animations.

pub fn update_marker(&mut self, id: usize, node_id: usize)

Adds the marker id, or moves it, so it points to the node node_id.

Markers are drawn as a blinking ring around the target node unless a custom objects::NodeTemplate::marker_ui is installed.

pub fn allocate_at_least(&mut self, width: Option<f32>, height: Option<f32>)

Sets the minimum width and/or height the widget should occupy, in egui points. None leaves the corresponding dimension unconstrained.

pub fn allocate_at_most(&mut self, width: Option<f32>, height: Option<f32>)

Sets the maximum width and/or height the widget should occupy, in egui points. None leaves the corresponding dimension unconstrained.

Trait Implementations

impl Clone for Map

fn clone(&self) -> Map

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Default for Map

fn default() -> Self

Creates an empty map; equivalent to Map::new.

impl Widget for &mut Map

fn ui(self, ui: &mut Ui) -> Response

Renders the map, handling panning (drag), zooming (mouse wheel) and the right-click context menu if one was installed.