Codemy Pygame 31 takes us to a 'parenthetical' correction on our player image.
Initially, the player just hangs in mid-air rather than falls because the boundary
on the initial image is wider than the character. This was remedies in the last
tutorial by using a smaller bounding box. Here, we see a different procedure,
which consists of creating a mask over the character and having pygame check
for collisions against the mask. Doesn'really work here because the whiskers on the
cat stop it from falling; but it is the correct procedure to know about.
Was happy to find out about Find and Replace operations. This option is under edit in
pygame. A whole slew of dimensions on images gets corrected at once.
Here we see the box, in blue, which we want to replace with the mask, in red, for
collision detection.
import pygame
# Define a 2d Vector
vector = pygame.math.Vector2
# Initialize the game
pygame.init()
# Set display surface (divisible by 32 tile size)
WINDOW_WIDTH = 960 # 30 columns
WINDOW_HEIGHT = 640 # 20 rows
display_surface = pygame.display.set_mode((WINDOW_WIDTH, WINDOW_HEIGHT))
pygame.display.set_caption("Aspen Platformer - Codemy.com")
# Set FPS and clock
FPS = 60
clock = pygame.time.Clock()
# Tile Class
class Tile(pygame.sprite.Sprite):
# Read and Create tiles and put em on the screen
def __init__(self, x, y, image_integer, main_group, sub_group=""):
super().__init__()
# Load image and add to the tile subgroups
if image_integer == 1:
self.image = pygame.image.load('images/tiles/dirt.png')
elif image_integer == 2:
self.image = pygame.image.load('images/tiles/grass.png')
# Create a mask for the grass
self.mask = pygame.mask.from_surface(self.image)
sub_group.add(self)
elif image_integer == 3:
self.image = pygame.image.load('images/tiles/water.png')
sub_group.add(self)
# add every tile to main tile group
main_group.add(self)
# Get rect of images and position within the grid
self.rect = self.image.get_rect()
self.rect.topleft = (x, y)
# Apsen Player Class
class Aspen(pygame.sprite.Sprite):
def __init__(self, x, y, grass_tiles, water_tiles):
super().__init__()
# Define our aspen image
# self.image = pygame.image.load("images/aspen2.png")
# Set the current image
self.current_sprite = 0 # Sprite list index number
# Animation lists
self.move_right_sprites = []
self.move_left_sprites = []
self.idle_right_sprites = []
self.idle_left_sprites = []
# Define our moving right sprite images
self.move_right_sprites.append(pygame.transform.scale(pygame.image.load("images/cat2/Walk1.png"), (85, 74)))
self.move_right_sprites.append(pygame.transform.scale(pygame.image.load("images/cat2/Walk2.png"), (85, 74)))
self.move_right_sprites.append(pygame.transform.scale(pygame.image.load("images/cat2/Walk3.png"), (85, 74)))
self.move_right_sprites.append(pygame.transform.scale(pygame.image.load("images/cat2/Walk4.png"), (85, 74)))
self.move_right_sprites.append(pygame.transform.scale(pygame.image.load("images/cat2/Walk5.png"), (85, 74)))
self.move_right_sprites.append(pygame.transform.scale(pygame.image.load("images/cat2/Walk6.png"), (85, 74)))
self.move_right_sprites.append(pygame.transform.scale(pygame.image.load("images/cat2/Walk7.png"), (85, 74)))
self.move_right_sprites.append(pygame.transform.scale(pygame.image.load("images/cat2/Walk8.png"), (85, 74)))
self.move_right_sprites.append(pygame.transform.scale(pygame.image.load("images/cat2/Walk9.png"), (85, 74)))
self.move_right_sprites.append(pygame.transform.scale(pygame.image.load("images/cat2/Walk10.png"), (85, 74)))
# Define Left Moving sprites and flip em
for sprite in self.move_right_sprites:
self.move_left_sprites.append(
pygame.transform.flip(sprite, True, False)) # Image, horizonta T/F, veritcal T/F
# Define Idle Right
self.idle_right_sprites.append(pygame.transform.scale(pygame.image.load("images/cat2/Idle1.png"), (85, 74)))
self.idle_right_sprites.append(pygame.transform.scale(pygame.image.load("images/cat2/Idle2.png"), (85, 74)))
self.idle_right_sprites.append(pygame.transform.scale(pygame.image.load("images/cat2/Idle3.png"), (85, 74)))
self.idle_right_sprites.append(pygame.transform.scale(pygame.image.load("images/cat2/Idle4.png"), (85, 74)))
self.idle_right_sprites.append(pygame.transform.scale(pygame.image.load("images/cat2/Idle5.png"), (85, 74)))
self.idle_right_sprites.append(pygame.transform.scale(pygame.image.load("images/cat2/Idle6.png"), (85, 74)))
self.idle_right_sprites.append(pygame.transform.scale(pygame.image.load("images/cat2/Idle7.png"), (85, 74)))
self.idle_right_sprites.append(pygame.transform.scale(pygame.image.load("images/cat2/Idle8.png"), (85, 74)))
self.idle_right_sprites.append(pygame.transform.scale(pygame.image.load("images/cat2/Idle9.png"), (85, 74)))
self.idle_right_sprites.append(pygame.transform.scale(pygame.image.load("images/cat2/Idle10.png"), (85, 74)))
# Define Idle Left - flip em
for sprite in self.idle_right_sprites:
self.idle_left_sprites.append(
pygame.transform.flip(sprite, True, False)) # Image, horizonta T/F, veritcal T/F
# Set our image
self.image = self.move_right_sprites[self.current_sprite]
# Get rect
self.rect = self.image.get_rect()
# Position aspen
self.rect.bottomleft = (x, y)
# Reset Aspen If She falls into the Water
self.start_x = x
self.start_y = y
# Define our grass and water
self.grass_tiles = grass_tiles
self.water_tiles = water_tiles
# Kinematic Vectors (x,y)
self.position = vector(x, y)
self.velocity = vector(0, 0) # Don't move to start 0,0
self.acceleration = vector(0, 0) # no speeding up or slowing down to start 0,0
# Kinematic Constants
self.HORIZONTAL_ACCELERATION = .5 # How quick player speeds up
self.HORIZONTAL_FRICTION = 0.10 # friction
self.VERTICAL_ACCELERATION = 0.5 # Gravity
self.VERTICAL_JUMP_SPEED = 15 # Going to determine how high we can jump
def jump(self):
# Only want to jump when aspen is on grass
if pygame.sprite.spritecollide(self, self.grass_tiles, False):
self.velocity.y = -1 * self.VERTICAL_JUMP_SPEED # jumping up so negative
def update(self):
# Draw a rect around our player
#pygame.draw.rect(display_surface, "blue", self.rect, 1)
# Create a mask
self.mask = pygame.mask.from_surface(self.image)
# Draw Mask (points surrounding player)
#mask_outline = self.mask.outline()
#pygame.draw.lines(self.image, "red", True, mask_outline)
# set the initial acceleration to 0,0 to start
self.acceleration = vector(0, self.VERTICAL_ACCELERATION)
keys = pygame.key.get_pressed()
if keys[pygame.K_LEFT]:
self.acceleration.x = -1 * self.HORIZONTAL_ACCELERATION
# Run our Animations left
self.animate(self.move_left_sprites, .4)
elif keys[pygame.K_RIGHT]:
self.acceleration.x = self.HORIZONTAL_ACCELERATION
# Run our Animations
self.animate(self.move_right_sprites, .4)
else:
# Check velocity (if positive=right, if negative=left)
if self.velocity.x > 0: # right
self.animate(self.idle_right_sprites, .2)
else:
self.animate(self.idle_left_sprites, .2)
# Calculate new Kinematics
self.acceleration.x -= self.velocity.x * self.HORIZONTAL_FRICTION
self.velocity += self.acceleration # (1,2) + (3,4) = (4,6)
self.position += self.velocity + 0.5 * self.acceleration
# Set up wraparound
if self.position.x < 0: # x value of position on the left side of screen
self.position.x = WINDOW_WIDTH
if self.position.x > WINDOW_WIDTH: # Right side of the screen
self.position.x = 0
# update rect
self.rect.bottomleft = self.position
# Check for collisions with Grass
touched_platforms = pygame.sprite.spritecollide(self, self.grass_tiles, False, pygame.sprite.collide_mask) # Return a python list of tiles we touched
if touched_platforms:
# Only want to adjust our position on the way down, not up
if self.velocity.y > 0:
self.position.y = touched_platforms[0].rect.top + 1
self.velocity.y = 0
# Check for collisions with Water
if pygame.sprite.spritecollide(self, self.water_tiles, False):
print("You Died!")
# Reset Aspen to the top of the screen - starting position
self.position = vector(self.start_x, self.start_y)
# Reset Velocity
self.velocity = vector(0, 0)
def animate(self, sprite_list, speed):
if self.current_sprite < len(sprite_list) - 1:
self.current_sprite += speed
else:
self.current_sprite = 0
# Update our image
self.image = sprite_list[int(self.current_sprite)]
# Define our sprite groups
main_tile_group = pygame.sprite.Group()
grass_tile_group = pygame.sprite.Group()
water_tile_group = pygame.sprite.Group()
aspen_group = pygame.sprite.Group()
# Create a tile map, nested python list: 0=no tile, 1=dirt, 2=grass, 3=water, 4=aspen
tile_map = [
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[2, 2, 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2],
[1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2],
[1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2],
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1],
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1]
]
# Create Tile objects from the tile map
# 2 for loops because tile map is nested. 20 i down
for i in range(len(tile_map)):
# loop thru the 30 elements in each list, j across
for j in range(len(tile_map[i])):
# Check for 0,1,2,3
if tile_map[i][j] == 1:
# dirt
Tile(j * 32, i * 32, 1, main_tile_group)
elif tile_map[i][j] == 2:
# grass
Tile(j * 32, i * 32, 2, main_tile_group, grass_tile_group)
elif tile_map[i][j] == 3:
# water
Tile(j * 32, i * 32, 3, main_tile_group, water_tile_group)
elif tile_map[i][j] == 4:
aspen = Aspen(j * 32, i * 32 + 32, grass_tile_group, water_tile_group)
aspen_group.add(aspen)
# Add a background
bg_image = pygame.image.load('images/tiles/bg.png')
bg_image_rect = bg_image.get_rect()
bg_image_rect.topleft = (0, 0)
# Game Loop
running = True
while running:
# Check to quit
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
# Jump
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_SPACE:
aspen.jump()
# fill the display or blit an image
# display_surface.fill("black")
display_surface.blit(bg_image, bg_image_rect)
# Draw the Tiles
main_tile_group.draw(display_surface)
# Update and draw sprites
aspen_group.update()
aspen_group.draw(display_surface)
# Update Display
pygame.display.update()
clock.tick(FPS)
# End the game
pygame.quit()
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