phamton...@gmail.com wrote:
> from Tkinter import *
> window = Tk()
> canvas = Canvas(window, width=500, height=500, background="green")
> canvas.pack()
>
> def move_ball(speed_x, speed_y):
> box = canvas.bbox("ball")
> x1 = box[0]
> y1 = box[1]
> x2 = box[2]
> y2 = box[3]
>
> if x1 <= 0:
> speed_x = 0
> speed_y = 0
>
> canvas.move("ball", speed_x, speed_y)
> canvas.after(30, move_ball, speed_x, speed_y)
>
> canvas.create_oval(225, 225, 275, 275, fill="blue", tags="ball")
>
> move_ball(-10, 7)
>
> mainloop()
>
> where in the code should i change to make the ball bounce around forever.
is it the x and y?
When the ball hits a wall you have to "reflect" it; for a vertical wall
speed_x has to change:
if x1 <= 0: # ball hits left wall
speed_x = -speed_x
elif ... # ball hits right wall
speed_x = -speed_x
Can you come up with the correct check for the right wall?
To try if this part works correctly temporarily change
> move_ball(-10, 7)
to
move_ball(-10, 0)
so that the ball only moves in horizontal direction. Once this works handle
the vertical walls and speed_y the same way.
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