From 507d8c4ff2424e0d877481209dfd7d64cb48c442 Mon Sep 17 00:00:00 2001
From: yucy207 <52816230+yucy207@users.noreply.github.com>
Date: Tue, 15 Oct 2019 16:37:31 +0800
Subject: [PATCH] =?UTF-8?q?=E5=A4=A7=E7=90=83=E5=90=83=E5=B0=8F=E7=90=83BU?=
 =?UTF-8?q?G=E4=BF=AE=E6=94=B9?=
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球在边界附近半径增大时(吃掉小球)，可能会使球在50ms内无法运动回边界内，导致球不断的在边界上改变速度(迷之抖动233)
---
 Day01-15/10.图形用户界面和游戏开发.md | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/Day01-15/10.图形用户界面和游戏开发.md b/Day01-15/10.图形用户界面和游戏开发.md
index ae65624..05d4bc6 100644
--- a/Day01-15/10.图形用户界面和游戏开发.md
+++ b/Day01-15/10.图形用户界面和游戏开发.md
@@ -249,12 +249,14 @@ class Ball(object):
         """移动"""
         self.x += self.sx
         self.y += self.sy
-        if self.x - self.radius <= 0 or \
-                self.x + self.radius >= screen.get_width():
-            self.sx = -self.sx
-        if self.y - self.radius <= 0 or \
-                self.y + self.radius >= screen.get_height():
-            self.sy = -self.sy
+        if self.x - self.radius <= 0:
+            self.sx = abs(self.sx)
+        if self.x + self.radius >= screen.get_width():
+            self.sx = -abs(self.sx)
+        if self.y - self.radius <= 0:
+            self.sy = abs(self.sy)
+        if self.y + self.radius >= screen.get_height():
+            self.sy = -abs(self.sy)
 
     def eat(self, other):
         """吃其他球"""