Pacman-style Maze Collision Detection

Hello,

While this site was down, I did something rather silly:- tried to make a game in DOS assembly language. Worse still, I have practically no experience in assembly language programming... :o

Nevertheless, I managed to get some double-buffering going, drew a maze to the back buffer and got a object moving with the cursor keys. Unfortunately, the detection of where the object is in the maze seems to be a bit messed up, as when you want to turn through a hole in a wall, it doesn't go until it's a tile past it, then you lose control completely and it just flies off the screen.

I've taken the liberty of expanding what code I'd written into Windows C so you people could digest what's going on without scratching your head at Intel instructions. The code is attached.

Can anyone help me with this? :confused:

DOS assembly language eh. What's that. I know about x86 assembly language but no DOS assembly.

Just kidding, I know what you mean but assembly is not related to DOS at all.

Seems that your one tile off in your sprite's or something. Shouldn't be too hard to fix.

Quote:

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Originally posted by Bubba
DOS assembly language eh. What's that. I know about x86 assembly language but no DOS assembly.

Just kidding, I know what you mean but assembly is not related to DOS at all.

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I know, but the BIOS doesn't give you Interrupt 21h, DOS does, so it won't work without DOS or DOS-compatible OS.

I second bubba your sprites are off i think.

try this:

Code:

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int sprite_center_x=sprite_x+half_imagewidth_x;
int sprite_center_y=sprite_y+half_imageheight_y;

TestForHit(sprite_center_x,sprite_center_y);

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