python - How can I make a ball move in pygame when dragged by mouse? -
i making small game in python balls fired catapult, , balls destroy structure of boxes , snake. @ moment have made boxes , snakes however, unable make balls come left direction destroy boxes. want make catapult on left side can hold ball , fire it. how can go making this? here code
import pygame pygame.locals import * pygame.color import * import pymunk pm pymunk import vec2d import sys ## ~~~~~~~~~~~~~~~~~~~~~~~~~ class ball(pygame.sprite.sprite): def __init__(self,screen): pygame.sprite.sprite.__init__(self) self.image = pygame.image.load('ball1.jpg') self.original = pygame.image.load('ball1.jpg') self.rect = self.image.get_rect() self.area = screen.get_rect() def add_ball(self, space, offset):#offset self.mass = 3 self.radius = 15 self.inertia = pm.moment_for_circle(self.mass, 0, self.radius, (0,0)) self.body = pm.body(self.mass, self.inertia) self.body.position = offset+200, 550 self.rect.center = to_pygame(self.body.position) self.shape = pm.circle(self.body, self.radius, (0,0)) space.add(self.body, self.shape) def draw(self,screen): pygame.draw.circle(screen, (255,255,255), self.rect.center, int(15), 3) def update(self): print("{0} {1}".format(self.rect.center, self.body.position)) self.rect.center = to_pygame(self.body.position) ## ~~~~~~~~~~~~~~~~~~~~~~~~~ class box(pygame.sprite.sprite): def __init__(self,screen): pygame.sprite.sprite.__init__(self) self.image = pygame.image.load('box1.jpg') self.original = pygame.image.load('box1.jpg') #self.image = pygame.image.load('snake.jpg') self.rect = self.image.get_rect() self.area = screen.get_rect() def add_box(self, space, posx, posy): global screen self.size= 30 self.points = [(-self.size, -self.size), (-self.size, self.size), (self.size,self.size), (self.size, -self.size)] self.mass = 0.3 self.moment = pm.moment_for_poly(self.mass, self.points, (0,0)) self.body = pm.body(self.mass, self.moment) self.body.position = vec2d(posx, posy) #print("box {0}".format(self.body.position)) self.rect.center = to_pygame(self.body.position) #print("box b {0}".format(self.rect)) self.shape = pm.poly(self.body, self.points, (0,0)) self.shape.friction = 1 #self.shape.group = 1 space.add(self.body, self.shape) def draw(self,screen): pygame.draw.rect(screen, (255,255,255), self.rect, 2) def update(self): self.rect.center = to_pygame(self.body.position) #pysics simulations movin body ## ~~~~~~~~~~~~~~~~~~~~~~~~~ class snake(pygame.sprite.sprite): def __init__(self,screen): pygame.sprite.sprite.__init__(self) self.image = pygame.image.load('snake.jpg') self.original = pygame.image.load('snake.jpg') self.rect = self.image.get_rect() self.area = screen.get_rect() def add_snake(self, space, posx, posy): global screen self.size= 30 self.points = [(-self.size, -self.size), (-self.size, self.size), (self.size,self.size), (self.size, -self.size)] self.mass = 0.1 self.moment = pm.moment_for_poly(self.mass, self.points, (0,0)) self.body = pm.body(self.mass, self.moment) self.body.position = vec2d(posx, posy) #print("box {0}".format(self.body.position)) self.rect.center = to_pygame(self.body.position) #print("box b {0}".format(self.rect)) self.shape = pm.poly(self.body, self.points, (0,0)) self.shape.friction = 1 #self.shape.group = 1 space.add(self.body, self.shape) def draw(self,screen): pygame.draw.rect(screen, (5,5,255), self.rect, 2) def update(self): self.rect.center = to_pygame(self.body.position) #pysics simulations movin body ## ~~~~~~~~~~~~~~~~~~~~~~~~~ def to_pygame(p): """small hack convert pymunk pygame coordinates""" return int(p[0]), int(-p[1]+600) def main(): pygame.init() screen = pygame.display.set_mode((600, 600)) pygame.display.set_caption("piling boxes") clock = pygame.time.clock() space = pm.space() space.gravity = (0.0, -900.0) space.damping = 0.5 ### ground body = pm.body() shape = pm.segment(body, (0,100), (600,100), .0) shape.friction = 1.0 space.add(shape) allsprites = pygame.sprite.group() offsety = 62 offsetx = 92 posx = 180 posy = 130 j in range(3): in range(5): box = box(screen) #add more boxes box.add_box(space, posx, posy) allsprites.add(box) posy = posy + offsety posy = 130 posx = posx + offsetx snake = snake(screen) snake.add_snake(space, posx, posy) allsprites.add(snake) selected = none ## ## posy = 130 ## offset = 92 ## in range(5): ## #offset = offset - 248 ## box = box(screen) #add more boxes ## #box.add_box(space) ## box.add_box(space, posx, posy) ## allsprites.add(box) ## posx = posx + offset ## ## #offset = offset + 62 posy =0 offset = 0 in range(5): ball = ball(screen) ball.add_ball(space, offset) offset = offset + 16 allsprites.add(ball) #background = pygame.surface(screen.get_size()) #background = background.convert() #background.fill((0,0,0)) #screen.blit(background, (0,0)) test_image = pygame.image.load("angryclonebg.jpg") #screen.blit(test_image, (0,0)) #coordinates (0,500)) #pygame.display.flip() while 1: clock.tick(60) space.step(1/90.0) event in pygame.event.get(): if event.type == quit: pygame.quit() sys.exit(0) elif event.type == keydown: if event.key == k_escape: pygame.quit() sys.exit(0) allsprites.update() screen.blit(test_image, (0,0)) #pygame.draw.line(screen, thecolors["red"], to_pygame((150,100)), to_pygame((450,100)), 3) allsprites.draw(screen) item in allsprites: item.draw(screen) pygame.display.flip() ## ~~~~~~~~~~~~~~~~~~~~~~~~~ if __name__ == '__main__': main() how can make balls used catapult fire balls?
after 2 minutes of looking on pymunk docs: http://pymunk.googlecode.com/svn/tags/pymunk-2.0.0/docs/api/index.html
to create cannon game. create ball object, , call apply_force. it's simple that.
if wish create catapult, bit more physics involved. need create line(segment) fixed joint ground. connect ball other end of segment. apply force segment, , when ball high enough, release joint.
edit:
i found helpful tutorial joints: http://code.google.com/p/pymunk/wiki/slideandpinjointsexample
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