Bouncing ball within a bouncing frame

[MarkTheStrange]

This was a challenge on the Facebook C64/C128 programmers group:

Create a sprite with a frame. Bounce a pixel within the sprite's frame. Bounce the sprite on the screen.

I thought an X16 version would be a fun task. The challenge was specifically to do it entirely in BASIC on the C64 using an expanded sprite (double-width, double-height) in a program with the smallest memory footprint (my X16 version takes up 244 bytes, but you get to stare at a screen doing nothing for many seconds while it initializes the sprite bitmap dynamically).

Since a square sprite makes for a boring bounce along a line between opposite corners, I made the ball bounce within a 48x42 rectangle inside the 64x64 sprite (to match an expanded sprite on the C64).

Screenshot 2025-02-19 at 17.14.51.png (69.17 KiB) Viewed 746 times

Try It Now!

[ahenry3068]

This was a challenge on the Facebook C64/C128 programmers group:

Create a sprite with a frame. Bounce a pixel within the sprite's frame. Bounce the sprite on the screen.

I thought an X16 version would be a fun task. The challenge was specifically to do it entirely in BASIC on the C64 using an expanded sprite (double-width, double-height) in a program with the smallest memory footprint (my X16 version takes up 244 bytes, but you get to stare at a screen doing nothing for many seconds while it initializes the sprite bitmap dynamically).

Since a square sprite makes for a boring bounce along a line between opposite corners, I made the ball bounce within a 48x42 rectangle inside the 64x64 sprite (to match an expanded sprite on the C64). Screenshot 2025-02-19 at 17.14.51.png

Try It Now!

Had to do my Own version . I DID NOT even look at Mark's code.

Try It Now!

[MarkTheStrange]

Had to do my Own version .
Try It Now!

Well, that's much fancier. Change the frame to a gilded picture frame and it will fit right in.

[ahenry3068]

Had to do my Own version .
Try It Now!

Well, that's much fancier. Change the frame to a gilded picture frame and it will fit right in.

That's doable... I will see.

[kelli217]

Looks like Robin saw the challenge too. [yt]https://www.youtube.com/watch?v=zwTA7xi0QD0[/yt]

[ahenry3068]

Added some interaction between the ball & the box.

Try It Now!

[desertfish]

There's some weird physics going on with the ball though. It changes course sometimes even when it is not actually touching the sides of the box.