From f7f7cee24aabce18e25e5d9cc2434e25f068978f Mon Sep 17 00:00:00 2001
From: pah100 <sushuang0322@gmail.com>
Date: Tue, 18 Jul 2017 14:24:09 +0800
Subject: [PATCH] [heatmap] Fix #6214 (Throw error when height is 0)

---
 src/chart/heatmap/HeatmapLayer.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/chart/heatmap/HeatmapLayer.js b/src/chart/heatmap/HeatmapLayer.js
index b1ba219c76..5d5d02eadf 100644
--- a/src/chart/heatmap/HeatmapLayer.js
+++ b/src/chart/heatmap/HeatmapLayer.js
@@ -60,8 +60,15 @@ define(function (require) {
                 ctx.drawImage(brush, x - r, y - r);
             }
 
+            if (!canvas.width || !canvas.height) {
+                // Avoid "Uncaught DOMException: Failed to execute 'getImageData' on
+                // 'CanvasRenderingContext2D': The source height is 0."
+                return canvas;
+            }
+
             // colorize the canvas using alpha value and set with gradient
             var imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
+
             var pixels = imageData.data;
             var offset = 0;
             var pixelLen = pixels.length;