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Checking a couple vars for truthiness. #173

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18 changes: 11 additions & 7 deletions src/graphics.js
Original file line number Diff line number Diff line change
Expand Up @@ -306,22 +306,26 @@
},
clearHighlight: function () {
var c = this.map_data.overlay_canvas;
c.getContext('2d').clearRect(0, 0, c.width, c.height);
if (c) {
c.getContext('2d').clearRect(0, 0, c.width, c.height);
}
},
// Draw all items from selected_list to a new canvas, then swap with the old one. This is used to delete items when using canvases.
refreshSelections: function () {
var canvas_temp, map_data = this.map_data;
// draw new base canvas, then swap with the old one to avoid flickering
canvas_temp = map_data.base_canvas;

map_data.base_canvas = this.createVisibleCanvas(map_data);
$(map_data.base_canvas).hide();
$(canvas_temp).before(map_data.base_canvas);
if (canvas_temp) {
map_data.base_canvas = this.createVisibleCanvas(map_data);
$(map_data.base_canvas).hide();
$(canvas_temp).before(map_data.base_canvas);

map_data.redrawSelections();
map_data.redrawSelections();

$(map_data.base_canvas).show();
$(canvas_temp).remove();
$(map_data.base_canvas).show();
$(canvas_temp).remove();
}
}
};

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