游戏可以运行

game/projectile.py

@@ -0,0 +1,61 @@
+import pygame
+import math
+from game.config import COLOR_WHITE, COLOR_ORANGE, COLOR_CYAN
+from game.utils import distance
+
+
+class Projectile:
+    def __init__(self, x, y, target, damage, proj_type="arrow", splash=0, slow_factor=0, slow_duration=0):
+        self.x = x
+        self.y = y
+        self.target = target
+        self.damage = damage
+        self.proj_type = proj_type
+        self.splash = splash
+        self.slow_factor = slow_factor
+        self.slow_duration = slow_duration
+        self.speed = 400
+        self.alive = True
+
+    def update(self, dt, enemies):
+        if not self.alive:
+            return
+
+        if not self.target or not self.target.alive:
+            self.alive = False
+            return
+
+        tx, ty = self.target.x, self.target.y
+        dx = tx - self.x
+        dy = ty - self.y
+        dist = math.hypot(dx, dy)
+
+        move = self.speed * dt
+        if dist <= move:
+            self._hit(enemies)
+        else:
+            self.x += dx / dist * move
+            self.y += dy / dist * move
+
+    def _hit(self, enemies):
+        self.alive = False
+        if self.proj_type == "cannon" and self.splash > 0:
+            for e in enemies:
+                if e.alive and distance(self.target.x, self.target.y, e.x, e.y) <= self.splash:
+                    e.take_damage(self.damage)
+        else:
+            self.target.take_damage(self.damage)
+
+        if self.proj_type == "slow" and self.target.alive:
+            self.target.apply_slow(self.slow_factor, self.slow_duration)
+
+    def draw(self, surface):
+        if not self.alive:
+            return
+        ix, iy = int(self.x), int(self.y)
+        if self.proj_type == "arrow":
+            pygame.draw.circle(surface, COLOR_WHITE, (ix, iy), 3)
+        elif self.proj_type == "cannon":
+            pygame.draw.circle(surface, COLOR_ORANGE, (ix, iy), 5)
+        elif self.proj_type == "slow":
+            pygame.draw.circle(surface, COLOR_CYAN, (ix, iy), 4)