From 58bb7eb6e06f6f569b4d311b203ce2a01a14e55c Mon Sep 17 00:00:00 2001
From: liyujian <liyujian@baidu.com>
Date: Thu, 28 Jun 2018 10:36:58 +0800
Subject: [PATCH 1/2] update canvas draw function,fix canvas element style
 offsite 0.5 bug

---
 src/map/baidu-map/CanvasLayer.js | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/src/map/baidu-map/CanvasLayer.js b/src/map/baidu-map/CanvasLayer.js
index 4ebb4aa3..944fede2 100644
--- a/src/map/baidu-map/CanvasLayer.js
+++ b/src/map/baidu-map/CanvasLayer.js
@@ -68,15 +68,10 @@ if (global.BMap) {
 
     CanvasLayer.prototype._draw = function() {
         var map = this._map;
-        var size = map.getSize();
-        var center = map.getCenter();
-        if (center) {
-            var pixel = map.pointToOverlayPixel(center);
-            this.canvas.style.left = pixel.x - size.width / 2 + 'px';
-            this.canvas.style.top = pixel.y - size.height / 2 + 'px';
-            this.dispatchEvent('draw');
-            this.options.update && this.options.update.call(this);
-        }
+        this.canvas.style.left = - map.offsetX + 'px';
+        this.canvas.style.top = - map.offsetY + 'px';
+        this.dispatchEvent('draw');
+        this.options.update && this.options.update.apply(this, arguments);
     }
 
     CanvasLayer.prototype.getContainer = function() {

From 872afe28f46bd91e60c9af76935744e92ebcde76 Mon Sep 17 00:00:00 2001
From: liyujian <liyujian@baidu.com>
Date: Fri, 30 Nov 2018 18:34:23 +0800
Subject: [PATCH 2/2] add throttle for mousemove event

---
 src/map/baidu-map/Layer.js | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/map/baidu-map/Layer.js b/src/map/baidu-map/Layer.js
index e453049f..9f5e8830 100644
--- a/src/map/baidu-map/Layer.js
+++ b/src/map/baidu-map/Layer.js
@@ -43,6 +43,13 @@ class Layer extends BaseLayer{
         });
 
     }
+    
+    throttle(fun, ctx, pixel, e) {
+        clearTimeout(fun.tId)
+        fun.tId = setTimeout(function(){
+            fun.call(ctx, pixel, e);
+        }, 300);
+    }
 
     clickEvent(e) {
         var pixel = e.pixel;
@@ -51,7 +58,8 @@ class Layer extends BaseLayer{
 
     mousemoveEvent(e) {
         var pixel = e.pixel;
-        super.mousemoveEvent(pixel, e);
+        this.throttle(super.mousemoveEvent, this, pixel, e);
+        // super.mousemoveEvent(pixel, e);
     }
 
     bindEvent(e) {