Update simpleheat.js

mourner#34
victorperezpiqueras · May 10, 2023 · 2f6e161 · 2f6e161
1 parent c1998c3
commit 2f6e161
Showing 1 changed file with 5 additions and 3 deletions.
diff --git a/simpleheat.js b/simpleheat.js
@@ -111,9 +111,11 @@ simpleheat.prototype = {
         }
 
         // colorize the heatmap, using opacity value of each pixel to get the right color from our gradient
-        var colored = ctx.getImageData(0, 0, this._width, this._height);
-        this._colorize(colored.data, this._grad);
-        ctx.putImageData(colored, 0, 0);
+        if (this._width != 0 && this._height != 0) {
+            var colored = ctx.getImageData(0, 0, this._width, this._height);
+            this._colorize(colored.data, this._grad);
+            ctx.putImageData(colored, 0, 0);
+        }
 
         return this;
     },