From bda3a6803c32d1a564f9d73153e6eb399a3f969e Mon Sep 17 00:00:00 2001
From: Andreas Hocevar <andreas.hocevar@gmail.com>
Date: Thu, 24 Sep 2015 14:44:50 +0200
Subject: [PATCH] Use tiles with lower or same resolution as view

---
 src/ol/renderer/canvas/canvasvectortilelayerrenderer.js | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/ol/renderer/canvas/canvasvectortilelayerrenderer.js b/src/ol/renderer/canvas/canvasvectortilelayerrenderer.js
index 3d739de5e7..5f4f0c130b 100644
--- a/src/ol/renderer/canvas/canvasvectortilelayerrenderer.js
+++ b/src/ol/renderer/canvas/canvasvectortilelayerrenderer.js
@@ -345,9 +345,12 @@ ol.renderer.canvas.VectorTileLayer.prototype.prepareFrame =
   var pixelRatio = frameState.pixelRatio;
 
   var tileGrid = source.getTileGrid();
-  var z = tileGrid.getZForResolution(resolution);
-  var tileRange = tileGrid.getTileRangeForExtentAndResolution(
-      extent, resolution);
+  var resolutions = tileGrid.getResolutions();
+  var z = resolutions.length - 1;
+  while (z > 0 && resolutions[z] < resolution) {
+    --z;
+  }
+  var tileRange = tileGrid.getTileRangeForExtentAndZ(extent, z);
   this.updateUsedTiles(frameState.usedTiles, source, z, tileRange);
   this.manageTilePyramid(frameState, source, tileGrid, pixelRatio,
       projection, extent, z, layer.getPreload());