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Commit tile-reuse branch back to trunk. This branch offers numerous performance

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improvements in the form of reduced memory use and lower element creating costs,
hopefully making the OpenLayers code more usable in internet explorer as well
as less of a memory hog in Firefox and other browsers. Additionally, a buffer
is available around the main map grid which allows tiles to be loaded outside
of the viewing area for faster dragging.


git-svn-id: http://svn.openlayers.org/trunk/openlayers@1137 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
crschmidt
2006-08-09 03:47:33 +00:00
parent 51ac2b4acf
commit 0ba7961df4
9 changed files with 194 additions and 105 deletions
Download Patch File Download Diff File Expand all files Collapse all files

136
lib/OpenLayers/Layer/Grid.js
View File

@@ -20,11 +20,8 @@ OpenLayers.Layer.Grid.prototype =
* @type Array(Array) */
grid: null,
/** asserts whether or not the layer's images have an alpha channel
*
* @type boolean */
alpha: false,
/** @type Integer */
buffer: 2,
/**
* @constructor
@@ -37,6 +34,7 @@ OpenLayers.Layer.Grid.prototype =
initialize: function(name, url, params, options) {
OpenLayers.Layer.HTTPRequest.prototype.initialize.apply(this,
arguments);
this.grid = new Array();
},
/** on destroy, clear the grid.
@@ -132,37 +130,33 @@ OpenLayers.Layer.Grid.prototype =
*
* @param {OpenLayers.Bounds} bounds
* @param {Boolean} zoomChanged
* @param {Boolean} minor
* @param {Boolean} dragging
*/
moveTo:function(bounds, zoomChanged, minor) {
moveTo:function(bounds, zoomChanged, dragging) {
if (bounds == null) {
bounds = this.map.getExtent();
}
if (bounds != null) {
if (!this.getVisibility()) {
if (zoomChanged) {
//now clear out the old grid and start a new one
this.clearGrid();
this.grid = null;
// FIX ME FIX ME FIX ME -- should be this.hideGrid() basically
}
} else if (!this.grid.length || zoomChanged
|| !this.getGridBounds().containsBounds(bounds, true)) {
this._initTiles();
} else {
if (!this.grid || zoomChanged) {
this._initTiles();
} else if (this.getGridBounds().containsBounds(bounds, true) == false) {
this._initTiles();
} else {
var i = 0;
while (this.getGridBounds().bottom > bounds.bottom) {
this.insertRow(false);
}
while (this.getGridBounds().left > bounds.left) {
this.insertColumn(true);
}
while (this.getGridBounds().top < bounds.top) {
this.insertRow(true);
}
while (this.getGridBounds().right < bounds.right) {
this.insertColumn(false);
while (true) {
var topLeft = this.map.getViewPortPxFromLayerPx( this.grid[0][0].position );
if (topLeft.x > -this.tileSize.w * (this.buffer - 1)) {
this.shiftColumn(true);
} else if (topLeft.x < -this.tileSize.w * this.buffer) {
this.shiftColumn(false);
} else if (topLeft.y > -this.tileSize.w * (this.buffer - 1)) {
this.shiftRow(true);
} else if (topLeft.y < -this.tileSize.h * this.buffer) {
this.shiftRow(false);
} else {
break;
}
}
}
@@ -188,19 +182,11 @@ OpenLayers.Layer.Grid.prototype =
topRightTile.bounds.right,
topRightTile.bounds.top);
},
/**
*
*/
_initTiles:function() {
//first of all, clear out the main div
this.div.innerHTML = "";
//now clear out the old grid and start a new one
this.clearGrid();
this.grid = new Array();
var viewSize = this.map.getSize();
var bounds = this.map.getExtent();
var extent = this.map.getMaxExtent();
@@ -209,13 +195,13 @@ OpenLayers.Layer.Grid.prototype =
var tilelat = resolution * this.tileSize.h;
var offsetlon = bounds.left - extent.left;
var tilecol = Math.floor(offsetlon/tilelon);
var tilecol = Math.floor(offsetlon/tilelon) - this.buffer;
var tilecolremain = offsetlon/tilelon - tilecol;
var tileoffsetx = -tilecolremain * this.tileSize.w;
var tileoffsetlon = extent.left + tilecol * tilelon;
var offsetlat = bounds.top - (extent.bottom + tilelat);
var tilerow = Math.ceil(offsetlat/tilelat);
var tilerow = Math.ceil(offsetlat/tilelat) + this.buffer;
var tilerowremain = tilerow - offsetlat/tilelat;
var tileoffsety = -tilerowremain * this.tileSize.h;
var tileoffsetlat = extent.bottom + tilerow * tilelat;
@@ -227,12 +213,24 @@ OpenLayers.Layer.Grid.prototype =
var startX = tileoffsetx;
var startLon = tileoffsetlon;
var newGrid = (this.grid.length == 0);
var rowidx = 0;
do {
var row = new Array();
this.grid.push(row);
var row;
if (newGrid) {
row = new Array();
this.grid.push(row);
} else {
row = this.grid[rowidx++];
}
tileoffsetlon = startLon;
tileoffsetx = startX;
var colidx = 0;
do {
var tileBounds = new OpenLayers.Bounds(tileoffsetlon,
@@ -247,19 +245,24 @@ OpenLayers.Layer.Grid.prototype =
y -= parseInt(this.map.layerContainerDiv.style.top);
var px = new OpenLayers.Pixel(x, y);
var tile;
var tile = this.addTile(tileBounds, px);
tile.draw(this.alpha);
row.push(tile);
if (newGrid) {
tile = this.addTile(tileBounds, px);
tile.draw();
row.push(tile);
} else {
tile = row[colidx++];
tile.moveTo(tileBounds, px);
}
tileoffsetlon += tilelon;
tileoffsetx += this.tileSize.w;
} while (tileoffsetlon < bounds.right)
} while (tileoffsetlon <= bounds.right + tilelon * this.buffer)
tileoffsetlat -= tilelat;
tileoffsety += this.tileSize.h;
} while(tileoffsetlat > bounds.bottom - tilelat)
} while(tileoffsetlat >= bounds.bottom - tilelat * this.buffer)
},
@@ -376,16 +379,16 @@ OpenLayers.Layer.Grid.prototype =
* @param {Boolean} prepend if true, prepend to beginning.
* if false, then append to end
*/
insertRow:function(prepend) {
shiftRow:function(prepend) {
var modelRowIndex = (prepend) ? 0 : (this.grid.length - 1);
var modelRow = this.grid[modelRowIndex];
var newRow = new Array();
var resolution = this.map.getResolution();
var deltaY = (prepend) ? -this.tileSize.h : this.tileSize.h;
var deltaLat = resolution * -deltaY;
var row = (prepend) ? this.grid.pop() : this.grid.shift();
for (var i=0; i < modelRow.length; i++) {
var modelTile = modelRow[i];
var bounds = modelTile.bounds.clone();
@@ -393,18 +396,14 @@ OpenLayers.Layer.Grid.prototype =
bounds.bottom = bounds.bottom + deltaLat;
bounds.top = bounds.top + deltaLat;
position.y = position.y + deltaY;
var newTile = this.addTile(bounds, position);
newTile.draw(this.alpha);
newRow.push(newTile);
row[i].moveTo(bounds, position);
}
if (prepend) {
this.grid.unshift(row);
} else {
this.grid.push(row);
}
if (newRow.length>0){
if (prepend) {
this.grid.unshift(newRow);
} else {
this.grid.push(newRow);
}
}
},
/**
@@ -413,15 +412,14 @@ OpenLayers.Layer.Grid.prototype =
* @param {Boolean} prepend if true, prepend to beginning.
* if false, then append to end
*/
insertColumn:function(prepend) {
var modelCellIndex;
shiftColumn: function(prepend) {
var deltaX = (prepend) ? -this.tileSize.w : this.tileSize.w;
var resolution = this.map.getResolution();
var deltaLon = resolution * deltaX;
for (var i=0; i<this.grid.length; i++) {
var row = this.grid[i];
modelTileIndex = (prepend) ? 0 : (row.length - 1);
var modelTileIndex = (prepend) ? 0 : (row.length - 1);
var modelTile = row[modelTileIndex];
var bounds = modelTile.bounds.clone();
@@ -429,13 +427,13 @@ OpenLayers.Layer.Grid.prototype =
bounds.left = bounds.left + deltaLon;
bounds.right = bounds.right + deltaLon;
position.x = position.x + deltaX;
var newTile = this.addTile(bounds, position);
newTile.draw(this.alpha);
var tile = prepend ? this.grid[i].pop() : this.grid[i].shift()
tile.moveTo(bounds, position);
if (prepend) {
row = row.unshift(newTile);
this.grid[i].unshift(tile);
} else {
row = row.push(newTile);
this.grid[i].push(tile);
}
}
},

16
lib/OpenLayers/Layer/KaMap.js
View File

@@ -15,8 +15,8 @@ OpenLayers.Layer.KaMap.prototype =
*
* @type Boolean
*/
isBaseLayer: true,
isBaseLayer: true,
units: 'degrees',
scales: {inches: 1, feet: 12, miles: 63360.0, meters: 39.3701, kilometers: 39370.1, degrees: 4374754},
@@ -44,7 +44,8 @@ OpenLayers.Layer.KaMap.prototype =
);
}
},
addTile:function(bounds,position) {
getURL:function(bounds) {
var zoom = this.map.getZoom();
var maxRes = this.map.maxResolution;
var mapRes = this.map.getResolution();
@@ -53,14 +54,19 @@ OpenLayers.Layer.KaMap.prototype =
var cellSize = new OpenLayers.Size(mapRes*this.tileSize.w, mapRes*this.tileSize.h);
var pX = Math.round(((bounds.left) / cellSize.w) * this.tileSize.w);
var pY = -Math.round(((bounds.top) / cellSize.h) * this.tileSize.h);
var url = this.getFullRequestString(
return this.getFullRequestString(
{ t: pY,
l: pX,
s: scale
});
},
addTile:function(bounds,position) {
var url = this.getURL(bounds);
return new OpenLayers.Tile.Image(this, position, bounds,
url, this.tileSize);
},
_initTiles:function() {
//first of all, clear out the main div
@@ -112,7 +118,7 @@ OpenLayers.Layer.KaMap.prototype =
new OpenLayers.Pixel(tileoffsetx - parseInt(this.map.layerContainerDiv.style.left),
tileoffsety - parseInt(this.map.layerContainerDiv.style.top))
);
tile.draw((this.alpha));
tile.draw();
row.push(tile);
tileoffsetlon += tilelon;

16
lib/OpenLayers/Layer/WMS.js
View File

@@ -82,7 +82,14 @@ OpenLayers.Layer.WMS.prototype =
return obj;
},
getURL: function (bounds) {
return this.getFullRequestString(
{BBOX:bounds.toBBOX(),
WIDTH:this.tileSize.w,
HEIGHT:this.tileSize.h});
},
/**
* addTile creates a tile, initializes it, and
* adds it to the layer div.
@@ -93,16 +100,11 @@ OpenLayers.Layer.WMS.prototype =
* @type OpenLayers.Tile.Image
*/
addTile:function(bounds,position) {
url = this.getFullRequestString(
{BBOX:bounds.toBBOX(),
WIDTH:this.tileSize.w,
HEIGHT:this.tileSize.h});
url = this.getURL(bounds);
return new OpenLayers.Tile.Image(this, position, bounds,
url, this.tileSize);
},
/**
* Catch changeParams and uppercase the new params to be merged in
* before calling changeParams on the super class.

34
lib/OpenLayers/Layer/WorldWind.js
View File

@@ -38,18 +38,9 @@ OpenLayers.Layer.WorldWind.prototype =
}
},
addTile:function(bounds,position) {
var zoom = this.map.getZoom();
var extent = this.map.getMaxExtent();
zoom = zoom - Math.log(this.map.maxResolution / (this.lzd/512))/Math.log(2);
if (this.map.getResolution() <= (this.lzd/512) && zoom <= this.zoomLevels) {
var deg = this.lzd/Math.pow(2,zoom);
var x = Math.floor((bounds.left - extent.left)/deg);
var y = Math.floor((bounds.bottom - extent.bottom)/deg);
var url = this.getFullRequestString(
{ L: zoom,
X: x,
Y: y
});
if (this.map.getResolution() <= (this.lzd/512)
&& this.getZoom() <= this.zoomLevels) {
return new OpenLayers.Tile.Image(this, position, bounds,
url, this.tileSize);
} else {
@@ -62,6 +53,25 @@ OpenLayers.Layer.WorldWind.prototype =
}
},
getZoom: function () {
var zoom = this.map.getZoom();
var extent = this.map.getMaxExtent();
zoom = zoom - Math.log(this.map.maxResolution / (this.lzd/512))/Math.log(2);
return zoom;
},
getURL: function (bounds) {
var deg = this.lzd/Math.pow(2,this.getZoom());
var x = Math.floor((bounds.left - extent.left)/deg);
var y = Math.floor((bounds.bottom - extent.bottom)/deg);
return this.getFullRequestString(
{ L: zoom,
X: x,
Y: y
});
},
/** @final @type String */
CLASS_NAME: "OpenLayers.Layer.WorldWind"
});