need help with tile collision detection.....

Started by werdy666 January 01, 2003 03:05 AM

6 comments, last by werdy666 21 years, 10 months ago

Author

743

January 01, 2003 03:05 AM

i have made a reasonable attempt at my own collision detection routine for a tile game. However i have run into a snag. I created a tile that reduces the player's speed by half, however it does not work as i intended it. it slows the player down perfect, however it makes the player jump back and forth when he is on a slowdown tile and against the wall. this makes it near impossible to move through a narrow gap with the slowdown tile there. It sounds wierd i know, but if you could download my sourcecode and compile it you will understand better! if anyone could tell me what i am doing wrong, or why i am getting this jumping effect and some idea to get rid of it, i would greatly appreciatte it. And i do check every single tile each time the player moves. But i will fix that later. Source Thanks for your time! Werdy666

Edit:: how do i make a clickable link to my sourcecode?? Edit 2 :: Thanks! [edited by - werdy666 on January 1, 2003 9:41:02 AM] [edited by - werdy666 on January 1, 2003 9:48:52 AM]

smart_idiot

1,298

January 01, 2003 04:49 AM

Like this.

Chess is played by three people. Two people play the game; the third provides moral support for the pawns. The object of the game is to kill your opponent by flinging captured pieces at his head. Since the only piece that can be killed is a pawn, the two armies agree to meet in a pawn-infested area (or even a pawn shop) and kill as many pawns as possible in the crossfire. If the game goes on for an hour, one player may legally attempt to gouge out the other player's eyes with his King.

Pipo DeClown

804

January 01, 2003 05:24 AM

‹a href="link">Word or sentence to click on‹/a>

EDIT:: np

.lick

[edited by - Pipo DeClown on January 1, 2003 10:14:19 AM]

smart_idiot

1,298

January 01, 2003 05:25 AM

It might be easier if you use a 2D array rather than store all the tiles with their positions, but anyway. . .

I added a function:

  bool IsTileType(double x, double y, int type){ for (int p = 0; p<324;p++)  if(tile[p].texture_number == type && fabs(x - tile[p].xpos) < 32 && fabs(y - tile[p].ypos) < 32)   return true;     return false;}

and I changed CheckKeyboardInput to this:

  int CheckKeyboardInput(){	if (keys[VK_ESCAPE])				// Was ESC Pressed?	{		done=TRUE;				// ESC Signalled A Quit	}	if (keys[VK_F1])					// Is F1 Being Pressed?	{		keys[VK_F1]=FALSE;				// If So Make Key FALSE		KillGLWindow();					// Kill Our Current Window		fullscreen=!fullscreen;				// Toggle Fullscreen / Windowed Mode		// Recreate Our OpenGL Window		if (!CreateGLWindow("OpenGL Basecode Version 0.40....",SCREENWIDTH,SCREENHEIGHT,BITSPERPIXEL,fullscreen))		{			return 0;				// Quit If Window Was Not Created		}	}	if (keys[VK_LEFT])	{  int speed = IsTileType(plyx, plyy, HALFSPEED) ? playerspeed/2 : playerspeed;    if(!IsTileType(plyx-speed, plyy, WALL))	 	plyx -= speed;	}		if (keys[VK_RIGHT])	{  int speed = IsTileType(plyx, plyy, HALFSPEED) ? playerspeed/2 : playerspeed;  if(!IsTileType(plyx+speed, plyy, WALL))	 	plyx += speed;	}		if (keys[VK_UP])	{  int speed = IsTileType(plyx, plyy, HALFSPEED) ? playerspeed/2 : playerspeed;  if(!IsTileType(plyx, plyy-speed, WALL))	 	plyy -= speed;	}    	if (keys[VK_DOWN])	{	  int speed = IsTileType(plyx, plyy, HALFSPEED) ? playerspeed/2 : playerspeed;  if(!IsTileType(plyx, plyy+speed, WALL))	 	plyy += speed;	}return true;}

and it seems to work fine.

LordLethis

122

January 01, 2003 05:30 AM

To create a link you can use either


Some text to describe link


Some text to describe link

As for the rest... I''m currently looking through your code

[My Lousy Page | Kings Of Chaos | Vampires | [email=lordlethis@hotmail.com]email.me[/email]]

LordLethis

122

January 01, 2003 05:46 AM

If you run into a wall in a slowdown tile, you set the player back to his previous position, and, because it''s a slowdown tile, you set his pos another bit (half the movement speed) back. This has the result you are jumping back. smart_idiot already gave you a possible solution, I just wanted to tell you why this has happened.

[My Lousy Page | Kings Of Chaos | Vampires | [email=lordlethis@hotmail.com]email.me[/email]]