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Limit image layer requests to layer extent

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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
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12
src/ol/renderer/canvas/canvasimagelayerrenderer.js
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@@ -7,6 +7,7 @@ goog.require('goog.vec.Mat4');
goog.require('ol.ImageBase');
goog.require('ol.ImageState');
goog.require('ol.ViewHint');
goog.require('ol.extent');
goog.require('ol.layer.Image');
goog.require('ol.renderer.Map');
goog.require('ol.renderer.canvas.Layer');
@@ -102,9 +103,16 @@ ol.renderer.canvas.ImageLayer.prototype.prepareFrame =
var hints = frameState.viewHints;
if (!hints[ol.ViewHint.ANIMATING] && !hints[ol.ViewHint.INTERACTING]) {
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)) {
image = imageSource.getImage(
frameState.extent, viewResolution, pixelRatio, viewState.projection);
renderedExtent, viewResolution, pixelRatio, viewState.projection);
if (!goog.isNull(image)) {
var imageState = image.getState();
if (imageState == ol.ImageState.IDLE) {