leaflet.pm

2018-08-14 admin

leaflet.pm是什么

什么是leaflet.pm,A Leaflet Plugin For Editing Geometry Layers in Leaflet 1.0

leaflet.pm介绍、leaflet.pm使用

A Leaflet Plugin For Creating And Editing Geometry Layers in Leaflet 1.0. Draw, Edit, Drag, Cut and Snap Features.

In the name “leaflet.pm” the “pm” stands for Polygon Management. At the time, this plugin only supported polygons. Now you can edit Markers, Polylines, Polygons, Circles, Rectangles, LayerGroups, GeoJSON and more are coming.

snap at drag

Why another geometry editing plugin?

As leaflet.draw development seemed to came to a halt and I needed support for leaflet 1.0 I created this plugin myself due to a lack of alternatives. As we are always using the latest leaflet version in a big production app, I will (have to) keep this plugin constantly developed.

Getting Started

Install via npm

npm install leaflet.pm --save

Install via Bower (DEPRECATED - leaflet.pm is no longer supporting bower since 0.17.0)

bower install leaflet.pm --save

Install Manually

Download leaflet.pm.css and leaflet.pm.min.js and include them in your project.

Include via CDN

CSS

<link rel="stylesheet" href="https://unpkg.com/leaflet.pm@latest/dist/leaflet.pm.css" />

JS

<script src="https://unpkg.com/leaflet.pm@latest/dist/leaflet.pm.min.js"></script>

Include as ES6 Module

import 'leaflet.pm';
import 'leaflet.pm/dist/leaflet.pm.css';

Include as CommonJS Module

require('leaflet.pm');
require('leaflet.pm/dist/leaflet.pm.css');

Documentation

Init Leaflet.PM

Just include leaflet.pm.min.js right after Leaflet. It initializes itself. If you want certain layers to be ignored by leaflet.pm, pass pmIgnore: true to their options when creating them. Example:

L.marker([51.50915, -0.096112], { pmIgnore: true }).addTo(map);
Leaflet.PM Toolbar

This plugin comes with an optional toolbar to give you buttons to use the various features.

// define toolbar options
var options = {
    position: 'topleft', // toolbar position, options are 'topleft', 'topright', 'bottomleft', 'bottomright'
    drawMarker: true, // adds button to draw markers
    drawPolyline: true, // adds button to draw a polyline
    drawRectangle: true, // adds button to draw a rectangle
    drawPolygon: true, // adds button to draw a polygon
    drawCircle: true, // adds button to draw a cricle
    cutPolygon: true, // adds button to cut a hole in a polygon
    editMode: true, // adds button to toggle edit mode for all layers
    removalMode: true, // adds a button to remove layers
};

// add leaflet.pm controls to the map
map.pm.addControls(options);

If no options are passed, all buttons will be shown.

If you are wondering how e.g. the drawPolygon button will enable drawing mode with specific options, here it is: Simply enable drawing mode programatically, pass it your options and disable it again. The options will persist, even when the mode is enabled/disabled via the toolbar.

Example:

// make markers not snappable during marker draw
map.pm.enableDraw('Marker', { snappable: false });
map.pm.disableDraw('Marker');

// let polygons finish their shape on double click
map.pm.enableDraw('Poly', { finishOn: 'dblclick' });
map.pm.disableDraw('Poly');

All available options are specified in the Drawing Mode Section below

Drawing Mode

Use Drawing Mode on a map like this

// optional options for line style during draw. These are the defaults
var options = {
    // snapping
    snappable: true,
    snapDistance: 20,

    // self intersection
    allowSelfIntersection: true,

    // the lines between coordinates/markers
    templineStyle: {
        color: 'red',
    },

    // the line from the last marker to the mouse cursor
    hintlineStyle: {
        color: 'red',
        dashArray: [5, 5],
    },

    // show a marker at the cursor
    cursorMarker: false,

    // finish drawing on double click
    // DEPRECATED: use finishOn: 'dblclick' instead
    finishOnDoubleClick: false,

    // specify type of layer event to finish the drawn shape
    // example events: 'mouseout', 'dblclick', 'contextmenu'
    // List: http://leafletjs.com/reference-1.2.0.html#interactive-layer-click
    finishOn: 'contextmenu',

    // custom marker style (only for Marker draw)
    markerStyle: {
        opacity: 0.5,
        draggable: true,
    },
};

// enable drawing mode for shape - e.g. Poly, Line, etc
map.pm.enableDraw('Poly', options);
map.pm.enableDraw('Rectangle', options);
map.pm.enableDraw('Line', options);
map.pm.enableDraw('Marker', options);
map.pm.enableDraw('Circle', options);

// get array of all available shapes
map.pm.Draw.getShapes();

// listen to when drawing mode gets enabled
map.on('pm:drawstart', function(e) {
    e.shape; // the name of the shape being drawn (i.e. 'Circle')
    e.workingLayer; // the leaflet layer displayed while drawing
});

// disable drawing mode
map.pm.disableDraw('Poly');

// listen to when drawing mode gets disabled
map.on('pm:drawend', function(e) {
    e.shape; // the name of the shape being drawn (i.e. 'Circle')
});

// listen to when a new layer is created
map.on('pm:create', function(e) {
    e.shape; // the name of the shape being drawn (i.e. 'Circle')
    e.layer; // the leaflet layer created
});

// listen to vertexes being added to the workingLayer (works only on polylines & polygons)
map.on('pm:drawstart', function(e) {
    var layer = e.workingLayer;
    layer.on('pm:vertexadded', function(e) {
        // e includes the new vertex, it's marker
        // the index in the coordinates array
        // the working layer and shape
    });

    // check self intersection
    layer.pm.hasSelfIntersection();
});

// listen to the center of a circle being added
map.on('pm:drawstart', function(e) {
    var circle = e.workingLayer;

    // this fires only for circles
    circle.on('pm:centerplaced', function(e) {
        console.log(e);
    });
});

// listen to when the center of a circle is moved
map.on('pm:create', function(e) {
    var circle = e.layer;

    // this fires only for circles
    circle.on('pm:centerplaced', function(e) {
        console.log(e);
    });
});
Creating Holes or Cutting a Polygon

cut polygonEnable drawing for the shape “Cut” to draw a polygon that gets subtracted from all underlying polygons. This way you can create holes, cut polygons in half or remove parts of it.

Important: the cutted layer will be replaced, not updated. Listen to the pm:cut event to update your layer references in your code. The pm:cut event will provide you with the old/removed/cut layer and returns the resulting layer(s) that is/are added to the map.

// recommended options (used when enabled via toolbar)
var options = { snappable: false, cursorMarker: false };

// enable cutting
map.pm.Draw.Cut.enable(options);

// disable cutting
map.pm.Draw.Cut.disable(options);

// toggle cutting
map.pm.Draw.Cut.toggle(options);

// listen to when a specific layer gets cut
layer.on('pm:cut', function(e) {});

// listen to when any layer on the map gets cut
map.on('pm:cut', function(e) {});
Edit Mode

Use Edit Mode for a layer like this:

var polygonLayer = L.geoJson(data).addTo(map);

// optional options
var options = {
    // makes the layer draggable
    draggable: true,

    // makes the vertices snappable to other layers
    // temporarily disable snapping during drag by pressing ALT
    snappable: true,

    // distance in pixels that needs to be undercut to trigger snapping
    // default: 30
    snapDistance: 30,

    // self intersection allowed?
    allowSelfIntersection: true,

    // disable the removal of markers/vertexes via right click
    preventMarkerRemoval: false,

    // disable the possibility to edit vertexes
    preventVertexEdit: false,
};

// enable edit mode
polygonLayer.pm.enable(options);
marker.pm.enable(options);

// disable edit mode
polygonLayer.pm.disable();

// toggle edit mode
polygonLayer.pm.toggleEdit(options);

// check if edit mode is enabled
polygonLayer.pm.enabled(); // returns true/false

// listen to changes
polygonLayer.on('pm:edit', function(e) {});
polygonLayer.on('pm:dragstart', function(e) {});
polygonLayer.on('pm:drag', function(e) {});
polygonLayer.on('pm:dragend', function(e) {});

// listen to when vertexes are being added or removed from the layer
polygonLayer.on('pm:vertexadded', function(e) {});
polygonLayer.on('pm:vertexremoved', function(e) {});

// listen to when a marker of a polygon-vertex is being dragged
polygonLayer.on('pm:markerdragstart', function(e) {
    // the property e.ringIndex refers to the coordinate ring inside the polygon the marker belongs to
    // if it's undefined, there are no rings
    // e.index is the index of the marker inside the coordinate ring / array it belongs to
});
polygonLayer.on('pm:markerdragend', function(e) {});

// listen to when snapping occurs
// pm:snap and pm:unsnap are, in addition to the layer, also fired on the markers of the polygon
// if you'd need it for some advanced behaviour
polygonLayer.on('pm:snap', function(e) {});
polygonLayer.on('pm:unsnap', function(e) {});

// if allowSelfIntersection is false: listen to when a self-intersection is detected
// e.intersection includes a geoJSON of the intersection
polygonLayer.on('pm:intersect', function(e) {});

// toggle global edit mode (edit mode for all layers on the map)
map.pm.toggleGlobalEditMode(options);

// listen to when global edit mode is toggled
map.on('pm:globaleditmodetoggled', function(e) {});

// check self intersection
polygonLayer.pm.hasSelfIntersection(); // true/false
Removal Mode
// toggle global removal mode
map.pm.toggleGlobalRemovalMode();

// listen to removal of layers that are NOT ignored and NOT helpers by leaflet.pm
map.on('pm:remove', function(e) {});

Customize Style

In order to change the style of the lines during draw, pass these options to the enableDraw() function.

// optional options for line style during draw. These are the defaults
var options = {
    // the lines between coordinates/markers
    templineStyle: {
        color: 'red',
    },

    // the line from the last marker to the mouse cursor
    hintlineStyle: {
        color: 'red',
        dashArray: [5, 5],
    },
};

// enable drawing mode for shape - e.g. Poly, Line, Circle, etc
map.pm.enableDraw('Poly', options);

To customize the style of the drawn layer with leaflet options, you can either pass the options to enableDraw:

// optional options for line style during draw. These are the defaults
var options = {
    templineStyle: {},
    hintlineStyle: {},
    pathOptions: {
        // add leaflet options for polylines/polygons
        color: 'orange',
        fillColor: 'green',
    },
};

// enable drawing mode for shape - e.g. Poly or Line
map.pm.enableDraw('Poly', options);

or set the options generally:

map.pm.setPathOptions({
    color: 'orange',
    fillColor: 'green',
    fillOpacity: 0.4,
});

Feature Request

I’m adopting the Issue Management of lodash which means, feature requests get the “Feature Request” Label and then get closed. You can upvote to existing feature requests (or create new ones). Upvotes make me see how much a feature is requested and prioritize their implementation. Please see the existing Feature Requests here and upvote if you want them to be implemented.

Credit

As I never built a leaflet plugin before, I looked heavily into the code of leaflet.draw to find out how to do stuff. So don’t be surprised to see some familiar code.

The icons used for the toolbar are CC-BY Glyphicons.

I also took a hard look at the great L.GeometryUtil for some of my helper functions.

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