File size: 3,626 Bytes
d2efaca |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 |
import {Layer} from '../Layer';
import * as DomUtil from '../../dom/DomUtil';
import * as Util from '../../core/Util';
import Browser from '../../core/Browser';
import {Bounds} from '../../geometry/Bounds';
/*
* @class Renderer
* @inherits Layer
* @aka L.Renderer
*
* Base class for vector renderer implementations (`SVG`, `Canvas`). Handles the
* DOM container of the renderer, its bounds, and its zoom animation.
*
* A `Renderer` works as an implicit layer group for all `Path`s - the renderer
* itself can be added or removed to the map. All paths use a renderer, which can
* be implicit (the map will decide the type of renderer and use it automatically)
* or explicit (using the [`renderer`](#path-renderer) option of the path).
*
* Do not use this class directly, use `SVG` and `Canvas` instead.
*
* @event update: Event
* Fired when the renderer updates its bounds, center and zoom, for example when
* its map has moved
*/
export var Renderer = Layer.extend({
// @section
// @aka Renderer options
options: {
// @option padding: Number = 0.1
// How much to extend the clip area around the map view (relative to its size)
// e.g. 0.1 would be 10% of map view in each direction
padding: 0.1
},
initialize: function (options) {
Util.setOptions(this, options);
Util.stamp(this);
this._layers = this._layers || {};
},
onAdd: function () {
if (!this._container) {
this._initContainer(); // defined by renderer implementations
// always keep transform-origin as 0 0
DomUtil.addClass(this._container, 'leaflet-zoom-animated');
}
this.getPane().appendChild(this._container);
this._update();
this.on('update', this._updatePaths, this);
},
onRemove: function () {
this.off('update', this._updatePaths, this);
this._destroyContainer();
},
getEvents: function () {
var events = {
viewreset: this._reset,
zoom: this._onZoom,
moveend: this._update,
zoomend: this._onZoomEnd
};
if (this._zoomAnimated) {
events.zoomanim = this._onAnimZoom;
}
return events;
},
_onAnimZoom: function (ev) {
this._updateTransform(ev.center, ev.zoom);
},
_onZoom: function () {
this._updateTransform(this._map.getCenter(), this._map.getZoom());
},
_updateTransform: function (center, zoom) {
var scale = this._map.getZoomScale(zoom, this._zoom),
viewHalf = this._map.getSize().multiplyBy(0.5 + this.options.padding),
currentCenterPoint = this._map.project(this._center, zoom),
topLeftOffset = viewHalf.multiplyBy(-scale).add(currentCenterPoint)
.subtract(this._map._getNewPixelOrigin(center, zoom));
if (Browser.any3d) {
DomUtil.setTransform(this._container, topLeftOffset, scale);
} else {
DomUtil.setPosition(this._container, topLeftOffset);
}
},
_reset: function () {
this._update();
this._updateTransform(this._center, this._zoom);
for (var id in this._layers) {
this._layers[id]._reset();
}
},
_onZoomEnd: function () {
for (var id in this._layers) {
this._layers[id]._project();
}
},
_updatePaths: function () {
for (var id in this._layers) {
this._layers[id]._update();
}
},
_update: function () {
// Update pixel bounds of renderer container (for positioning/sizing/clipping later)
// Subclasses are responsible of firing the 'update' event.
var p = this.options.padding,
size = this._map.getSize(),
min = this._map.containerPointToLayerPoint(size.multiplyBy(-p)).round();
this._bounds = new Bounds(min, min.add(size.multiplyBy(1 + p * 2)).round());
this._center = this._map.getCenter();
this._zoom = this._map.getZoom();
}
});
|