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We split the grid init into a seperate function, and use that as the

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controlling mechanism, to reduce code duplication between Grid/KaMap/other
layers that need a different grid origin. r=euzuro (Closes #1349)


git-svn-id: http://svn.openlayers.org/trunk/openlayers@6231 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
crschmidt
2008-02-12 18:24:15 +00:00
parent 57f6d9b914
commit dd1f4d1fa9
2 changed files with 68 additions and 88 deletions
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61
lib/OpenLayers/Layer/Grid.js
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@@ -299,6 +299,43 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
this.removeExcessTiles(1,1);
},
/**
* Method: calculateGridLayout
* Generate parameters for the grid layout. This
*
* Parameters:
* bounds - {<OpenLayers.Bound>}
* extent - {<OpenLayers.Bounds>}
* resolution - {Number}
*
* Returns:
* Object containing properties tilelon, tilelat, tileoffsetlat,
* tileoffsetlat, tileoffsetx, tileoffsety
*/
calculateGridLayout: function(bounds, extent, resolution) {
var tilelon = resolution * this.tileSize.w;
var tilelat = resolution * this.tileSize.h;
var offsetlon = bounds.left - extent.left;
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) + this.buffer;
var tilerowremain = tilerow - offsetlat/tilelat;
var tileoffsety = -tilerowremain * this.tileSize.h;
var tileoffsetlat = extent.bottom + tilerow * tilelat;
return {
tilelon: tilelon, tilelat: tilelat,
tileoffsetlon: tileoffsetlon, tileoffsetlat: tileoffsetlat,
tileoffsetx: tileoffsetx, tileoffsety: tileoffsety
}
},
/**
* Method: initGriddedTiles
*
@@ -318,23 +355,17 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
var extent = this.map.getMaxExtent();
var resolution = this.map.getResolution();
var tilelon = resolution * this.tileSize.w;
var tilelat = resolution * this.tileSize.h;
var offsetlon = bounds.left - extent.left;
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 tileLayout = this.calculateGridLayout(bounds, extent, resolution);
var tileoffsetx = Math.round(tileLayout.tileoffsetx); // heaven help us
var tileoffsety = Math.round(tileLayout.tileoffsety);
var tileoffsetlon = tileLayout.tileoffsetlon;
var tileoffsetlat = tileLayout.tileoffsetlat;
var offsetlat = bounds.top - (extent.bottom + 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;
tileoffsetx = Math.round(tileoffsetx); // heaven help us
tileoffsety = Math.round(tileoffsety);
var tilelon = tileLayout.tilelon;
var tilelat = tileLayout.tilelat;
this.origin = new OpenLayers.Pixel(tileoffsetx, tileoffsety);