Re: [pygame] more circles

[B W <stabbingfinger@xxxxxxxxx>]

Yes, if you're not getting it then an example is probably better than more explanation. Here's your program with the changes I had in mind.

""" MoveCircleSizeCircle.py
Makes a circle that changes
it's position and size by the
keyboard, 10/3/10"""

import pygame
pygame.init()

screen = pygame.display.set_mode((640, 480))

class Circle(pygame.sprite.Sprite):
    def __init__(self, startPos, direction):
        pygame.sprite.Sprite.__init__(self)
        self.rect = pygame.Rect(0,0,50,50)
        self._base_image = self._make_image()
        self.image = self._base_image
        self.rect.center = startPos
        self.dx,self.dy = direction
        self.dw,self.dh = 0,0
    
    def update(self):
        """update size and position of sprite each frame"""
        if (self.dw,self.dh) != (0,0):
            self.resize(self.dw, self.dh)
        
        self.rect.centerx += self.dx           #move rect (x, y)
        self.rect.centery += self.dy
        
        if self.rect.right > screen.get_width():
            self.rect.left = screen.get_width() - 50
        if self.rect.left < 0:
            self.rect.right = 50
        if self.rect.bottom > screen.get_height():
            self.rect.top = screen.get_height() - 50
        if self.rect.top < 0:
            self.rect.bottom = 50

    def resize(self, x=0, y=0):
        """resize sprite once"""
        if (x,y) == (0,0):
            return
        r = self.rect
        save_center = r.center
        r.size = r.width+x, r.height+y
        if r.height > 200:
            r.height = 200
        if r.width > 200:
            r.width = 200
        if r.height < 2:
            r.height = 2
        if r.width < 2:
            r.width = 2
        r.center = save_center
        ## CHOICE: either remake or scale the image
        if False:
            self.image = self._make_image()
        else:
            ## but scaled images do not look as neat
            self._inflate_image()

    def _inflate_image(self):
        """use transform on base image"""
        self.image = pygame.transform.smoothscale(
            self._base_image, (self.rect.size))

    def _make_image(self):
        """make image from scratch"""
        image = pygame.Surface(self.rect.size)
        image.fill((255, 255, 255))
        rect = image.get_rect()
        w,h = self.rect.size
        radius = min(w, h) / 2
        pygame.draw.circle(image, (0, 0, 255), rect.center, radius)
        return image

def main():
    pygame.display.set_caption("Move the Circle with Arrows, Resize it with(0)+(9)-")
    
    background = "">    background.fill((255, 255, 255))
    screen.blit(background, (0, 0))
    
    circle = Circle([320, 240], [0, 0])
    pygame.mouse.set_visible(False)
    allSprites = pygame.sprite.Group(circle)
    clock = pygame.time.Clock()
    keepGoing = True
    
    while keepGoing:
        clock.tick(30)
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                keepGoing = False
            elif event.type == pygame.KEYDOWN:
                if event.key == pygame.K_DOWN:
                    circle.dy = 2
                if event.key == pygame.K_UP:
                    circle.dy = -2
                if event.key == pygame.K_RIGHT:
                    circle.dx = 2
                if event.key == pygame.K_LEFT:
                    circle.dx = -2
                if event.key == pygame.K_ESCAPE:
                    keepGoing = False
                if event.key == pygame.K_9:           #resize by -2
                    circle.dw,circle.dh = (-2, -2)
                if event.key == pygame.K_0:
                    circle.dw,circle.dh = (2, 2)      #resize by +2
            
            elif event.type == pygame.KEYUP:         
                if event.key == pygame.K_DOWN:
                    circle.dy = 0
                if event.key == pygame.K_UP:
                    circle.dy = 0
                if event.key == pygame.K_LEFT:
                    circle.dx = 0
                if event.key == pygame.K_RIGHT:
                    circle.dx = 0
                if event.key == pygame.K_9:          #stop resize
                    circle.dw,circle.dh = (0,0)
                if event.key == pygame.K_0:
                    circle.dw,circle.dh = (0,0)      #stop resize
                        
        allSprites.clear(screen, background)
        allSprites.update()
        allSprites.draw(screen)
        
        pygame.display.flip()
        
    pygame.mouse.set_visible(True)
        
if __name__ == "__main__":
    main()
    pygame.quit()

Gumm

On Thu, Oct 7, 2010 at 8:08 PM, kevin hayes <kevinosky@xxxxxxxxx> wrote:

I put some thought into your suggestions, but I'm still not piecing it together. I tried to use the inflate, transform.scale in my update function, but that didn't work. Also, I don't understand your hint (hint: move some of the constructor code to a resize method and call that from in constructor, as well as the main) By constructor you mean the first __init__( variable, variable...) ?  This stuff doesn't come naturally to me, but I find it fascinating.  If you could just show me (more explicitly) how to do this, that would help.
Thanks for the links, I will check them out.

On Wed, Oct 6, 2010 at 10:02 PM, B W <stabbingfinger@xxxxxxxxx> wrote:

You have to resize the rect *and* the image. You can use pygame functions Rect.inflate* and transform.scale, respectively, or you can do-it-yerself (hint: move some of the constructor code to a resize method and call that from in constructor, as well as the main loop).

Also, the += and -= in the event handler cases are probably not doing what you intend. If you get the resize working so you can see the circle change and it grows or moves at a strange rate, re-examine those calculations.

Gumm