按钮

button.py

@@ -0,0 +1,32 @@
+import pygame
+import pygame.font
+
+class Button():
+    def __init__(self, ai_settings, screen, msg):
+        """初始化按钮的属性"""
+        self.screen = screen
+        self.screen_rect = screen.get_rect()
+
+        # 设置按钮的尺寸和其它属性
+        self.width, self.height = 200, 50
+        self.button_color = (0, 255, 0)
+        self.text_color = (255,255,255)
+        self.font = pygame.font.SysFont(None, 48)
+
+        # 创建按钮的rect对象，并使其居中
+        self.rect = pygame.Rect(0, 0, self.width, self.height)
+        self.rect.center = self.screen_rect.center
+
+        # 按钮的标签只需创建一次
+        self.prep_msg(msg)
+
+    def prep_msg(self, msg):
+        """将msg渲染成图像，并使其在按钮上居中"""
+        self.msg_image = self.font.render(msg, True, self.text_color, self.button_color)
+        self.msg_image_rect = self.msg_image.get_rect()
+        self.msg_image_rect.center = self.rect.center
+
+    def draw_button(self):
+        # 绘制一个用颜色填充的文本，再绘制文本
+        self.screen.fill(self.button_color, self.rect)
+        self.screen.blit(self.msg_image, self.msg_image_rect)