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<p>这个疑问来自pygame和太空入侵者游戏</p>
<p>玩家边界的检查</p>
<pre class="lang-py prettyprint-override"><code>playerX += playerX_change
if playerX <=0:
playerX = 0
elif playerX >=736:
playerX = 736
</code></pre>
<p>检查敌我双方的边界;敌军运动</p>
<pre class="lang-py prettyprint-override"><code>enemyX += enemyX_change
if enemyX <= 0:
enemyX_change = 0.3
elif enemy >= 736:
enemyX_change = -0.3
</code></pre>