add

Author: vangj

python/pygame/README.md

@@ -14,4 +14,5 @@ All images take from [craftpix](https://craftpix.net/).
 * [Image Rotation](basic/image-rotation.py): learn how to rotate an image
 * [Sound](basic/bouncing-image-with-sound.py): learn how to play sound
 * [Key Events](basic/key-movement.py): learn how to listen for key events
-* [Mouse Movement](basic/mouse-movement.py): learn how to move a sprite with the mouse
+* [Mouse Movement](basic/mouse-movement.py): learn how to move a sprite with the mouse
+* [Collision](basic/collection-detection.py): learn how to detect collision

python/pygame/basic/collison-detection.py

@@ -0,0 +1,105 @@
+import os
+import random
+import sys
+
+import pygame
+from pygame.locals import *
+
+
+class Satyr(pygame.sprite.Sprite):
+    def __init__(self, position, ipath, scale=0.5):
+        pygame.sprite.Sprite.__init__(self)
+
+        img = pygame.image.load(ipath)
+        rect = img.get_rect(center=position)
+        w, h = rect.size[0], rect.size[1]
+        w, h = int(w * scale), int(h * scale)
+        img = pygame.transform.scale(img, (w, h))
+
+        rect = img.get_rect(center=position)
+
+        self.image = img
+        self.rect = rect
+        self.rect.center = position
+
+    def draw(self, surface, position):
+        self.rect.center = position
+        surface.blit(self.image, position)
+
+
+class Image(pygame.sprite.Sprite):
+    def __init__(self, position, ipath, scale=1.0):
+        pygame.sprite.Sprite.__init__(self)
+
+        img = pygame.image.load(ipath)
+        w, h = img.get_rect().size[0], img.get_rect().size[1]
+        w, h = int(w * scale), int(h * scale)
+        img = pygame.transform.scale(img, (w, h))
+
+        rect = img.get_rect(center=position)
+
+        self.image = img
+        self.rect = rect
+        self.rect.center = position
+        self.dx = 1 if random.random() < 0.5 else -1
+        self.dy = 1 if random.random() < 0.5 else 1
+
+    def draw(self, surface):
+        surface.blit(self.image, self.rect.center)
+
+    def update(self, width, height):
+        x, y = self.rect.center
+
+        if x + self.image.get_rect().size[0] >= width:
+            self.dx = -1
+        elif x <= 0:
+            self.dx = 1
+
+        if y + self.image.get_rect().size[1] >= height:
+            self.dy = -1
+        elif y <= 0:
+            self.dy = 1
+
+        x, y = x + 1 * self.dx, y + 1 * self.dy
+        self.rect.center = x, y
+
+
+def start():
+    pygame.init()
+
+    FPS = 30
+    width = 400
+    height = 400
+    DISPLAYSURF = pygame.display.set_mode((width, height))
+    DISPLAYSURF.fill((255, 255, 255))
+    pygame.display.set_caption('Key Events')
+    fps_clock = pygame.time.Clock()
+
+    satyr = Satyr((200, 200), './images/Satyr_01_Idle_000.png', scale=0.25)
+
+    ball = Image((random.randint(0, width), random.randint(0, height)), './images/ball.png', scale=0.25)
+    ball_group = pygame.sprite.Group()
+    ball_group.add(ball)
+
+    while True:
+        for event in pygame.event.get():
+            if event.type == QUIT:
+                pygame.quit()
+                sys.exit()
+
+        DISPLAYSURF.fill((255, 255, 255, 0))
+
+        if pygame.sprite.spritecollide(satyr, ball_group, False):
+            print(f'collided {ball.rect.center}')
+
+        satyr.draw(DISPLAYSURF, pygame.mouse.get_pos())
+        ball.draw(DISPLAYSURF)
+        ball.update(width, height)
+
+        pygame.display.update()
+        fps_clock.tick(FPS)
+
+
+if __name__ == '__main__':
+    os.environ['SDL_VIDEO_CENTERED'] = '1'
+    start()