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L.TileCanvas.js
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L.TileCanvas.js
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// use mostly GridLayer method on events
L.TileCanvas = L.GridLayer.extend({
options: {
// overwrite L.GridLayer pane
pane: "overlayPane",
},
initialize: function (options) {
L.Util.setOptions(this, options);
L.Util.stamp(this);
this._layers = this._layers || {};
},
createTile: function () {
var tile = L.DomUtil.create("canvas");
var size = this.getTileSize();
tile.width = size.x;
tile.height = size.y;
return tile;
},
onAdd: function () {
L.GridLayer.prototype.onAdd.call(this);
// from L.L.Canvas
this.on("update", this._updatePaths, this);
// Redraw vectors since canvas is cleared upon removal,
// in case of removing the renderer itself from the map.
this._draw();
},
onRemove: function () {
L.GridLayer.prototype.onRemove.call(this);
// from L.L.Canvas
this.off("update", this._updatePaths, this);
},
getEvents: function () {
var events = L.GridLayer.prototype.getEvents.call(this);
events.zoomend = L.Canvas.prototype._onZoomEnd;
return events;
},
_updateTransform: L.Util.falseFn,
_initContainer: function () {
if (this._container) {
return;
}
L.GridLayer.prototype._initContainer.call(this);
var container = this._container;
L.DomEvent.on(container, "mousemove", this._onMouseMove, this);
L.DomEvent.on(
container,
"click dblclick mousedown mouseup contextmenu",
this._onClick,
this
);
L.DomEvent.on(container, "mouseout", this._handleMouseOut, this);
},
_updateLevels: function () {
L.GridLayer.prototype._updateLevels.call(this);
// remove the 'pointer: none' preventing interactive
this._level.el.classList.remove("leaflet-tile-container");
},
_addTile: function (coords, container) {
L.GridLayer.prototype._addTile.call(this, coords, container);
var key = this._tileCoordsToKey(coords);
var tile = this._tiles[key];
tile.needRedraw = true;
// disable dom event on canvas tile
tile.el["_leaflet_disable_events"] = true;
},
// disable 'move' event handler
_onMove: L.Util.falseFn,
_onMoveEnd: function () {
if (!this._map || this._map._animatingZoom) {
return;
}
L.GridLayer.prototype._onMoveEnd.call(this);
this.fire("update");
},
_update: function (center) {
L.GridLayer.prototype._update.call(this, center);
// update bounds with respect to current tiles
var tileRange = new L.Bounds();
for (var key in this._tiles) {
var tile = this._tiles[key];
if (tile.current) {
tileRange.extend(tile.coords);
}
}
// paths need this for cliping
this._bounds = this._tileRangeToLayerPxBounds(tileRange);
},
// because the vector.project referential differ from L.GridLayer referential
// we need some conversion: mapping layer points with tile range
_layerPxBoundsToTileRange: function (pxBounds) {
var bounds = new L.Bounds();
var pixelOrigin = this._map.getPixelOrigin();
bounds.extend(pxBounds.min.add(pixelOrigin));
bounds.extend(pxBounds.max.add(pixelOrigin));
return this._pxBoundsToTileRange(bounds);
},
_tileRangeToLayerPxBounds: function (tileRange) {
var tileSize = this.getTileSize();
var pixelOrigin = this._map.getPixelOrigin();
return new L.Bounds(
tileRange.min.scaleBy(tileSize).subtract(pixelOrigin),
tileRange.max.add([1, 1]).scaleBy(tileSize).subtract(pixelOrigin)
);
},
_extendRedrawBounds: function (layer) {
if (
layer._pxBounds &&
isFinite(layer._pxBounds.min.x) &&
isFinite(layer._pxBounds.min.y) &&
isFinite(layer._pxBounds.max.x) &&
isFinite(layer._pxBounds.max.y)
) {
var padding = (layer.options.weight || 0) + 1;
this._redrawBounds = this._redrawBounds || new L.Bounds();
this._redrawBounds.extend(
layer._pxBounds.min.subtract([padding, padding])
);
this._redrawBounds.extend(layer._pxBounds.max.add([padding, padding]));
}
},
_clearTile: function (tile) {
var ctx = tile.el.getContext("2d");
ctx.clearRect(0, 0, tile.el.width, tile.el.height);
tile.needRedraw = true;
},
_clear: function () {
// clear entire tiles that intersect the redraw bounds
var key,
tile,
tileRange = this._redrawBounds;
if (tileRange) {
tileRange = this._layerPxBoundsToTileRange(this._redrawBounds);
for (key in this._tiles) {
tile = this._tiles[key];
if (tile.current && tileRange.contains(tile.coords)) {
this._clearTile(tile);
}
}
}
},
_draw: function () {
if (this._map._animatingZoom) {
return;
}
var layer, bounds;
var tile, ctx, key, origin, translate;
// vector difference between tile and vector projection referentials
translate = this._level.origin.subtract(this._map.getPixelOrigin());
this._drawing = true;
// Render each tile marked as unclean
for (key in this._tiles) {
tile = this._tiles[key];
if (tile.needRedraw) {
this._ctx = ctx = tile.el.getContext("2d");
ctx.save();
origin = this._getTilePos(tile.coords).add(translate);
bounds = new L.Bounds();
bounds.extend(origin);
bounds.extend(origin.add(this.getTileSize()));
ctx.translate(-origin.x, -origin.y);
// filter layers that interesects the tile (bounds)
for (var order = this._drawFirst; order; order = order.next) {
layer = order.layer;
if (layer._pxBounds && layer._pxBounds.intersects(bounds)) {
layer._updatePath();
}
}
ctx.restore();
delete tile.needRedraw;
}
}
this._drawing = false;
},
// inherit all other method from the Canvas/Renderer class
_updatePaths: L.Canvas.prototype._updatePaths,
_initPath: L.Canvas.prototype._initPath,
_addPath: L.Canvas.prototype._addPath,
_removePath: L.Canvas.prototype._removePath,
_updatePath: L.Canvas.prototype._updatePath,
_updateStyle: L.Canvas.prototype._updateStyle,
_updateDashArray: L.Canvas.prototype._updateDashArray,
_requestRedraw: L.Canvas.prototype._requestRedraw,
_redraw: L.Canvas.prototype._redraw,
_updatePoly: L.Canvas.prototype._updatePoly,
_updateCircle: L.Canvas.prototype._updateCircle,
_fillStroke: L.Canvas.prototype._fillStroke,
_onClick: L.Canvas.prototype._onClick,
_onMouseMove: L.Canvas.prototype._onMouseMove,
_handleMouseOut: L.Canvas.prototype._handleMouseOut,
_handleMouseHover: L.Canvas.prototype._handleMouseHover,
_fireEvent: L.Canvas.prototype._fireEvent,
_bringToFront: L.Canvas.prototype._bringToFront,
_bringToBack: L.Canvas.prototype._bringToBack,
});