From b52f70888bf1a2e8400c236463bb2f14087cde94 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=B4=A2=E4=B8=98?= <yezengyue@gmail.com>
Date: Mon, 18 May 2020 14:24:12 +0800
Subject: [PATCH] =?UTF-8?q?feat:=20=E6=B7=BB=E5=8A=A0geom=20draw=20?=
 =?UTF-8?q?=E4=BA=8B=E4=BB=B6?=
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---
 src/chart/chart.js            | 6 +++++-
 src/chart/const.js            | 4 ++++
 src/chart/controller/scale.js | 2 +-
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/chart/chart.js b/src/chart/chart.js
index 69e1dabb8..200089fc6 100644
--- a/src/chart/chart.js
+++ b/src/chart/chart.js
@@ -6,6 +6,8 @@ import {
   EVENT_AFTER_DATA_CHANGE,
   EVENT_AFTER_SIZE_CHANGE,
   EVENT_AFTER_GEOM_INIT,
+  EVENT_BEFORE_GEOM_DRAW,
+  EVENT_AFTER_GEOM_DRAW,
   EVENT_CLEAR,
   EVENT_CLEAR_INNER
 } from './const';
@@ -592,12 +594,14 @@ class Chart extends Base {
       middlePlot.attr('clip', clip);
     }
 
+    this.emit(EVENT_BEFORE_GEOM_DRAW);
     for (let i = 0, length = geoms.length; i < length; i++) {
       const geom = geoms[i];
       geom.paint();
     }
-
+    this.emit(EVENT_AFTER_GEOM_DRAW);
     Chart.plugins.notify(this, 'afterGeomDraw');
+
     canvas.sort();
     this.get('frontPlot').sort();
     Chart.plugins.notify(this, 'beforeCanvasDraw');
diff --git a/src/chart/const.js b/src/chart/const.js
index 90d4e97a5..424b3f180 100644
--- a/src/chart/const.js
+++ b/src/chart/const.js
@@ -9,6 +9,8 @@ const EVENT_AFTER_DATA_CHANGE = 'afterdatachange';
 const EVENT_AFTER_SIZE_CHANGE = '_aftersizechange';
 
 const EVENT_AFTER_GEOM_INIT = '_aftergeominit';
+const EVENT_BEFORE_GEOM_DRAW = 'beforegeomdraw';
+const EVENT_AFTER_GEOM_DRAW = 'aftergeomdraw';
 
 const EVENT_CLEAR = 'clear';
 const EVENT_CLEAR_INNER = 'clearinner';
@@ -21,6 +23,8 @@ export {
   EVENT_AFTER_DATA_CHANGE,
   EVENT_AFTER_SIZE_CHANGE,
   EVENT_AFTER_GEOM_INIT,
+  EVENT_BEFORE_GEOM_DRAW,
+  EVENT_AFTER_GEOM_DRAW,
   EVENT_CLEAR,
   EVENT_CLEAR_INNER
 };
diff --git a/src/chart/controller/scale.js b/src/chart/controller/scale.js
index 5830765bd..0c8b8e5d1 100644
--- a/src/chart/controller/scale.js
+++ b/src/chart/controller/scale.js
@@ -129,7 +129,7 @@ class ScaleController {
         }
       } else {
         // 为了让图形居中，所以才设置range
-        offset = 1 / count * 1 / 2;
+        offset = 1 / count * 0.5; // 这里可能用0.25会更合理
         cfg.range = [ offset, 1 - offset ];
       }
     }