ashatora/openlayers
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Limit image layer requests to layer extent

Browse Source 
This has two nice consequences that can be seen in the wms-image.js and mapbuide-untiled.js examples:
 * no images are requested when you browse outside of the layer extent
 * when the layer extent is within the viewport extent, cached images are used since the intersecting extent is the same for multiple viewport extents
This commit is contained in:
Tim Schaub
2014-07-06 18:43:08 -06:00
parent 1daf36956c
commit 234cff4de5
5 changed files with 33 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
src/ol/renderer/dom/domimagelayerrenderer.js
View File

@@ -10,6 +10,7 @@ goog.require('ol.ImageBase');
goog.require('ol.ImageState');
goog.require('ol.ViewHint');
goog.require('ol.dom');
goog.require('ol.extent');
goog.require('ol.layer.Image');
goog.require('ol.renderer.dom.Layer');
goog.require('ol.source.Image');
@@ -89,8 +90,15 @@ ol.renderer.dom.ImageLayer.prototype.prepareFrame =
var hints = frameState.viewHints;
if (!hints[ol.ViewHint.ANIMATING] && !hints[ol.ViewHint.INTERACTING]) {
var image_ = imageSource.getImage(frameState.extent, viewResolution,
var renderedExtent = frameState.extent;
if (goog.isDef(layerState.extent)) {
renderedExtent = ol.extent.getIntersection(
renderedExtent, layerState.extent);
}
if (!hints[ol.ViewHint.ANIMATING] && !hints[ol.ViewHint.INTERACTING] &&
!ol.extent.isEmpty(renderedExtent)) {
var image_ = imageSource.getImage(renderedExtent, viewResolution,
frameState.pixelRatio, viewState.projection);
if (!goog.isNull(image_)) {
var imageState = image_.getState();