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| """Showcase of a very basic 2d platformer | |
| The red girl sprite is taken from Sithjester's RMXP Resources: | |
| http://untamed.wild-refuge.net/rmxpresources.php?characters | |
| .. note:: The code of this example is a bit messy. If you adapt this to your | |
| own code you might want to structure it a bit differently. | |
| """ | |
| __docformat__ = "reStructuredText" | |
| import math | |
| import sys | |
| import pygame | |
| import pymunk | |
| import pymunk.pygame_util | |
| from pymunk.vec2d import Vec2d | |
| def cpfclamp(f, min_, max_): | |
| """Clamp f between min and max""" | |
| return min(max(f, min_), max_) | |
| def cpflerpconst(f1, f2, d): | |
| """Linearly interpolate from f1 to f2 by no more than d.""" | |
| return f1 + cpfclamp(f2 - f1, -d, d) | |
| width, height = 690, 400 | |
| fps = 60 | |
| dt = 1.0 / fps | |
| PLAYER_VELOCITY = 100.0 * 2.0 | |
| PLAYER_GROUND_ACCEL_TIME = 0.05 | |
| PLAYER_GROUND_ACCEL = PLAYER_VELOCITY / PLAYER_GROUND_ACCEL_TIME | |
| PLAYER_AIR_ACCEL_TIME = 0.25 | |
| PLAYER_AIR_ACCEL = PLAYER_VELOCITY / PLAYER_AIR_ACCEL_TIME | |
| JUMP_HEIGHT = 16.0 * 3 | |
| JUMP_BOOST_HEIGHT = 24.0 | |
| JUMP_CUTOFF_VELOCITY = 100 | |
| FALL_VELOCITY = 250.0 | |
| JUMP_LENIENCY = 0.05 | |
| HEAD_FRICTION = 0.7 | |
| PLATFORM_SPEED = 1 | |
| def main(): | |
| ### PyGame init | |
| pygame.init() | |
| screen = pygame.display.set_mode((width, height)) | |
| clock = pygame.time.Clock() | |
| running = True | |
| font = pygame.font.SysFont("Arial", 16) | |
| sound = pygame.mixer.Sound("sfx.wav") | |
| img = pygame.image.load("xmasgirl1.png") | |
| ### Physics stuff | |
| space = pymunk.Space() | |
| space.gravity = Vec2d(0, -1000) | |
| pymunk.pygame_util.positive_y_is_up = True | |
| draw_options = pymunk.pygame_util.DrawOptions(screen) | |
| # box walls | |
| static = [ | |
| pymunk.Segment(space.static_body, (10, 50), (300, 50), 3), | |
| pymunk.Segment(space.static_body, (300, 50), (325, 50), 3), | |
| pymunk.Segment(space.static_body, (325, 50), (350, 50), 3), | |
| pymunk.Segment(space.static_body, (350, 50), (375, 50), 3), | |
| pymunk.Segment(space.static_body, (375, 50), (680, 50), 3), | |
| pymunk.Segment(space.static_body, (680, 50), (680, 370), 3), | |
| pymunk.Segment(space.static_body, (680, 370), (10, 370), 3), | |
| pymunk.Segment(space.static_body, (10, 370), (10, 50), 3), | |
| ] | |
| static[1].color = pygame.Color("red") | |
| static[2].color = pygame.Color("green") | |
| static[3].color = pygame.Color("red") | |
| # rounded shape | |
| rounded = [ | |
| pymunk.Segment(space.static_body, (500, 50), (520, 60), 3), | |
| pymunk.Segment(space.static_body, (520, 60), (540, 80), 3), | |
| pymunk.Segment(space.static_body, (540, 80), (550, 100), 3), | |
| pymunk.Segment(space.static_body, (550, 100), (550, 150), 3), | |
| ] | |
| # static platforms | |
| platforms = [ | |
| pymunk.Segment(space.static_body, (170, 50), (270, 150), 3) | |
| # , pymunk.Segment(space.static_body, (270, 100), (300, 100), 5) | |
| , | |
| pymunk.Segment(space.static_body, (400, 150), (450, 150), 3), | |
| pymunk.Segment(space.static_body, (400, 200), (450, 200), 3), | |
| pymunk.Segment(space.static_body, (220, 200), (300, 200), 3), | |
| pymunk.Segment(space.static_body, (50, 250), (200, 250), 3), | |
| pymunk.Segment(space.static_body, (10, 370), (50, 250), 3), | |
| ] | |
| for s in static + platforms + rounded: | |
| s.friction = 1.0 | |
| s.group = 1 | |
| space.add(*static, *platforms, *rounded) | |
| # moving platform | |
| platform_path = [(650, 100), (600, 200), (650, 300)] | |
| platform_path_index = 0 | |
| platform_body = pymunk.Body(body_type=pymunk.Body.KINEMATIC) | |
| platform_body.position = 650, 100 | |
| s = pymunk.Segment(platform_body, (-25, 0), (25, 0), 5) | |
| s.friction = 1.0 | |
| s.group = 1 | |
| s.color = pygame.Color("blue") | |
| space.add(platform_body, s) | |
| # pass through platform | |
| passthrough = pymunk.Segment(space.static_body, (270, 100), (320, 100), 5) | |
| passthrough.color = pygame.Color("yellow") | |
| passthrough.friction = 1.0 | |
| passthrough.collision_type = 2 | |
| passthrough.filter = pymunk.ShapeFilter(categories=0b1000) | |
| space.add(passthrough) | |
| def passthrough_handler(arbiter, space, data): | |
| if arbiter.shapes[0].body.velocity.y < 0: | |
| return True | |
| else: | |
| return False | |
| space.add_collision_handler(1, 2).begin = passthrough_handler | |
| # player | |
| body = pymunk.Body(5, float("inf")) | |
| body.position = 100, 100 | |
| head = pymunk.Circle(body, 10, (0, 5)) | |
| head2 = pymunk.Circle(body, 10, (0, 13)) | |
| feet = pymunk.Circle(body, 10, (0, -5)) | |
| # Since we use the debug draw we need to hide these circles. To make it | |
| # easy we just set their color to black. | |
| feet.color = 0, 0, 0, 0 | |
| head.color = 0, 0, 0, 0 | |
| head2.color = 0, 0, 0, 0 | |
| mask = pymunk.ShapeFilter.ALL_MASKS() ^ passthrough.filter.categories | |
| sf = pymunk.ShapeFilter(mask=mask) | |
| head.filter = sf | |
| head2.filter = sf | |
| feet.collision_type = 1 | |
| feet.ignore_draw = head.ignore_draw = head2.ignore_draw = True | |
| space.add(body, head, feet, head2) | |
| direction = 1 | |
| remaining_jumps = 2 | |
| landing = {"p": Vec2d.zero(), "n": 0} | |
| frame_number = 0 | |
| landed_previous = False | |
| while running: | |
| grounding = { | |
| "normal": Vec2d.zero(), | |
| "penetration": Vec2d.zero(), | |
| "impulse": Vec2d.zero(), | |
| "position": Vec2d.zero(), | |
| "body": None, | |
| } | |
| # find out if player is standing on ground | |
| def f(arbiter): | |
| n = -arbiter.contact_point_set.normal | |
| if n.y > grounding["normal"].y: | |
| grounding["normal"] = n | |
| grounding["penetration"] = -arbiter.contact_point_set.points[0].distance | |
| grounding["body"] = arbiter.shapes[1].body | |
| grounding["impulse"] = arbiter.total_impulse | |
| grounding["position"] = arbiter.contact_point_set.points[0].point_b | |
| body.each_arbiter(f) | |
| well_grounded = False | |
| if ( | |
| grounding["body"] != None | |
| and abs(grounding["normal"].x / grounding["normal"].y) < feet.friction | |
| ): | |
| well_grounded = True | |
| remaining_jumps = 2 | |
| ground_velocity = Vec2d.zero() | |
| if well_grounded: | |
| ground_velocity = grounding["body"].velocity | |
| for event in pygame.event.get(): | |
| if ( | |
| event.type == pygame.QUIT | |
| or event.type == pygame.KEYDOWN | |
| and (event.key in [pygame.K_ESCAPE, pygame.K_q]) | |
| ): | |
| running = False | |
| elif event.type == pygame.KEYDOWN and event.key == pygame.K_p: | |
| pygame.image.save(screen, "platformer.png") | |
| elif event.type == pygame.KEYDOWN and event.key == pygame.K_UP: | |
| if well_grounded or remaining_jumps > 0: | |
| jump_v = math.sqrt(2.0 * JUMP_HEIGHT * abs(space.gravity.y)) | |
| impulse = (0, body.mass * (ground_velocity.y + jump_v)) | |
| body.apply_impulse_at_local_point(impulse) | |
| remaining_jumps -= 1 | |
| elif event.type == pygame.KEYUP and event.key == pygame.K_UP: | |
| body.velocity = body.velocity.x, min( | |
| body.velocity.y, JUMP_CUTOFF_VELOCITY | |
| ) | |
| # Target horizontal velocity of player | |
| target_vx = 0 | |
| if body.velocity.x > 0.01: | |
| direction = 1 | |
| elif body.velocity.x < -0.01: | |
| direction = -1 | |
| keys = pygame.key.get_pressed() | |
| if keys[pygame.K_LEFT]: | |
| direction = -1 | |
| target_vx -= PLAYER_VELOCITY | |
| if keys[pygame.K_RIGHT]: | |
| direction = 1 | |
| target_vx += PLAYER_VELOCITY | |
| if keys[pygame.K_DOWN]: | |
| direction = -3 | |
| feet.surface_velocity = -target_vx, 0 | |
| if grounding["body"] != None: | |
| feet.friction = -PLAYER_GROUND_ACCEL / space.gravity.y | |
| head.friction = HEAD_FRICTION | |
| else: | |
| feet.friction, head.friction = 0, 0 | |
| # Air control | |
| if grounding["body"] == None: | |
| body.velocity = Vec2d( | |
| cpflerpconst( | |
| body.velocity.x, | |
| target_vx + ground_velocity.x, | |
| PLAYER_AIR_ACCEL * dt, | |
| ), | |
| body.velocity.y, | |
| ) | |
| body.velocity = body.velocity.x, max( | |
| body.velocity.y, -FALL_VELOCITY | |
| ) # clamp upwards as well? | |
| # Move the moving platform | |
| destination = platform_path[platform_path_index] | |
| current = Vec2d(*platform_body.position) | |
| distance = current.get_distance(destination) | |
| if distance < PLATFORM_SPEED: | |
| platform_path_index += 1 | |
| platform_path_index = platform_path_index % len(platform_path) | |
| t = 1 | |
| else: | |
| t = PLATFORM_SPEED / distance | |
| new = current.interpolate_to(destination, t) | |
| platform_body.position = new | |
| platform_body.velocity = (new - current) / dt | |
| ### Clear screen | |
| screen.fill(pygame.Color("black")) | |
| ### Helper lines | |
| for y in [50, 100, 150, 200, 250, 300]: | |
| color = pygame.Color("green") | |
| pygame.draw.line(screen, color, (10, y), (680, y), 1) | |
| ### Draw stuff | |
| space.debug_draw(draw_options) | |
| direction_offset = 48 + (1 * direction + 1) // 2 * 48 | |
| if grounding["body"] != None and abs(target_vx) > 1: | |
| animation_offset = 32 * (frame_number // 8 % 4) | |
| elif grounding["body"] is None: | |
| animation_offset = 32 * 1 | |
| else: | |
| animation_offset = 32 * 0 | |
| position = body.position + (-16, 28) | |
| p = pymunk.pygame_util.to_pygame(position, screen) | |
| screen.blit(img, p, (animation_offset, direction_offset, 32, 48)) | |
| # Did we land? | |
| if abs(grounding["impulse"].y) / body.mass > 200 and not landed_previous: | |
| sound.play() | |
| landing = {"p": grounding["position"], "n": 5} | |
| landed_previous = True | |
| else: | |
| landed_previous = False | |
| if landing["n"] > 0: | |
| p = pymunk.pygame_util.to_pygame(landing["p"], screen) | |
| pygame.draw.circle(screen, pygame.Color("yellow"), p, 5) | |
| landing["n"] -= 1 | |
| # Info and flip screen | |
| screen.blit( | |
| font.render("fps: " + str(clock.get_fps()), 1, pygame.Color("white")), | |
| (0, 0), | |
| ) | |
| screen.blit( | |
| font.render( | |
| "Move with Left/Right, jump with Up, press again to double jump", | |
| 1, | |
| pygame.Color("darkgrey"), | |
| ), | |
| (5, height - 35), | |
| ) | |
| screen.blit( | |
| font.render("Press ESC or Q to quit", 1, pygame.Color("darkgrey")), | |
| (5, height - 20), | |
| ) | |
| pygame.display.flip() | |
| frame_number += 1 | |
| ### Update physics | |
| space.step(dt) | |
| clock.tick(fps) | |
| if __name__ == "__main__": | |
| sys.exit(main()) |