making semi realistic inertia using a table and HMOVE/changing Y

[tschak909]

Am trying to think of how best to implement a small amount of inertia for both player and ball/missile movement. I am doing very old school code on Dogeball, and basically not keeping track of X (starting from a known spot, and just nudging hmove and keeping track of Y), this would seem to suggest that with a simple table in ROM, I could iterate through say, 5 values ranging from slowest to fast, to make something that feels like you're running (the player is a miniature golf block guy, btw),

 

What is everyone's thoughts on this? am just thinking out loud.

 

-Thom

[+5-11under]

After each period of time, velocity = velocity + acceleration. Also, location = location + velocity. If acceleration is constant at 1, then the speed will increase each period of time by 1, 2, 3, 4, etc., up to the maximum speed. Also, the location will jump by that amount each period (i.e. 1, 3, 6, 10)

 

I think I got that right. I'm sure someone else could confirm.

[Thomas Jentzsch]

That works, but for more realistic movement I suggest using sub pixel calculations (fractional 16 bit math).