上传新文件

particle.py

+from utility import *
+import pygame,random
+vec = pygame.math.Vector2
+
+class Particle:
+    "base class for all particles"
+    def __init__(self,main,x,y):
+        pass
+
+    def update_position(self):
+        self.acc("y",10)
+        self.velocity += self.acceleration
+        self.position += self.velocity*self.main.dt
+
+    def draw(self):
+        pygame.draw.circle(self.main.screen,RED,(int(self.position.x),int(self.position.y)),1)
+
+    def acc(self,dir,val):
+        if dir == "x":
+            self.velocity.x += val
+        if dir == "y":
+            self.velocity.y += val
\ No newline at end of file