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in single tile mode with no transition effect remove the back buffer when zooming

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This commit is contained in:
Éric Lemoine
2011-10-28 22:57:10 +02:00
parent 46de595f55
commit 2f80d52bfd
2 changed files with 54 additions and 0 deletions
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15
lib/OpenLayers/Layer/Grid.js
View File

@@ -274,13 +274,28 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
// We want to redraw whenever even the slightest part of the
// current bounds is not contained by our tile.
// (thus, we do not specify partial -- its default is false)
if ( forceReTile ||
(!dragging && !tilesBounds.containsBounds(bounds))) {
// In single tile mode with no transition effect, we insert
// a non-scaled backbuffer when the layer is moved. But if
// a zoom occurs right after a move, i.e. before the new
// image is received, we need to remove the backbuffer, or
// an ill-positioned image will be visible during the zoom
// transition.
if(lastResolution !== serverResolution &&
this.transitionEffect !== 'resize') {
this.removeBackBuffer();
}
if(lastResolution === serverResolution ||
(lastResolution &&
this.transitionEffect === 'resize')) {
this.applyBackBuffer(serverResolution);
}
this.initSingleTile(bounds);
}
} else {

39
tests/Layer/Grid.html
View File

@@ -1033,6 +1033,45 @@
map.destroy();
}
function test_singleTile_move_and_zoom(t) {
//
// In single tile mode with no transition effect, we insert a non-scaled
// backbuffer when the layer is moved. But if a zoom occurs right after
// a move, i.e. before the new image is received, we need to remove the
// backbuffer, or an ill-positioned image will be visible during the
// zoom transition.
//
t.plan(2);
var map = new OpenLayers.Map('map');
var layer = new OpenLayers.Layer.WMS('', '', {}, {
isBaseLayer: true,
singleTile: true,
ratio: 1
});
map.addLayer(layer);
map.setCenter(new OpenLayers.LonLat(0, 0), 0);
// pretend the image has been loaded
layer.updateBackBufferData();
layer.grid[0][0].isLoading = false; // this is to be able to create
// a back buffer
// move
map.setCenter(new OpenLayers.LonLat(10, 10));
t.ok(layer.backBuffer && layer.backBuffer.parentNode === layer.div,
'backbuffer inserted after map move');
// zoom
map.zoomTo(1);
t.eq(layer.backBuffer, null,
'back buffer removed when zooming');
map.destroy();
}
function test_backbuffer_scaled_layer(t) {
t.plan(15);