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Trackster: avoid drawing tiles multiple times by checking cache in delayed_draw.

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Jeremy Goecks
2011-02-03 09:34:39 -05:00
parent ea89f1fd79
commit a2a9898841
2 changed files with 9 additions and 4 deletions
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static/scripts/packed/trackster.js
+1 -1
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static/scripts/trackster.js
+8 -3
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@@ -1254,7 +1254,7 @@ $.extend( TiledTrack.prototype, Track.prototype, {
cached.css({ left: left });
this.show_tile( cached, parent_element );
} else {
this.delayed_draw(this, key, low, high, tile_index, resolution, parent_element, w_scale, draw_tile_ids);
this.delayed_draw(key, low, high, tile_index, resolution, parent_element, w_scale, draw_tile_ids);
}
tile_index += 1;
}
@@ -1289,11 +1289,16 @@ $.extend( TiledTrack.prototype, Track.prototype, {
for (var i = 0; i < this.child_tracks.length; i++) {
this.child_tracks[i].draw(force);
}
}, delayed_draw: function(track, key, low, high, tile_index, resolution, parent_element, w_scale, draw_tile_ids) {
}, delayed_draw: function(key, low, high, tile_index, resolution, parent_element, w_scale, draw_tile_ids) {
var track = this;
// Put a 50ms delay on drawing so that if the user scrolls fast, we don't load extra data
var id = setTimeout(function() {
if (low <= track.view.high && high >= track.view.low) {
var tile_element = track.draw_tile(resolution, tile_index, parent_element, w_scale);
// Show/draw tile: check cache for tile; if tile not in cache, draw it.
var tile_element = track.tile_cache.get(key);
if (!tile_element) {
tile_element = track.draw_tile(resolution, tile_index, parent_element, w_scale);
}
if (tile_element) {
// Store initial canvas in case we need to use it for overview
if (!track.initial_canvas && !window.G_vmlCanvasManager) {