Shooting and Collision Detection

Topic: Shooting and Collision Detection (Read 134365 times) previous topic - next topic

0 Members and 1 Guest are viewing this topic.

Re: Shooting and Collision Detection

Reply #15 – July 07, 2013, 03:55:34 pm

Programmings just like that though, such small things are easily missed out and can be hard to realize.

Its a great reference for a shooting-bullet code though, thank you so much.

I'm having trouble implement it.

for the off-map representation of the bullet, I threw it in a Bullet.js script file

same with the code for when your hero creates a bullet but I think I need an if-statement and GetKey(); function for the trigger-button/input from the player. I think this might need to be in an update or game script file.

the code that is attached to the map engine I'm guessing could go in a seperate script for the general map engine

I think the collision detection would go in the same script file as when the player creates a bullet, maybe that can also go in Bullet.js

same with the entity check code

Still I have no idea what is the right way to use such a script in sphere, the bullet code is basically controlling a person on a map so I'm guessing I might as well all just throw it in a mapengine or update script or both but

Code: (javascript) [Select]


function Update()
{
  // your update script stuff
  UpdateBullets();
}
 
function game() {
    // your game code
 
    SetUpdateScript("Update()");
    MapEngine("map.rmp", 60);
}

by your update stuff you meant bullet update code stuff or just general update stuff?
same with game code?

I think If yes I would make a MapEngine.js and throw the entire code in there then have the function Update() to handle the rest of the code inside. I would call RequireScript(MapEngine.js) in the Startscript.js but how do I set it as a MapEngine script... I think if I can understand where and how to manage script files in Sphere I could be on my way to trying out this code and making my own for other stuff very smoothly. For now its an enigma.

Re: Shooting and Collision Detection

Reply #16 – July 07, 2013, 05:37:37 pm

I'll make a test demo, complete with all the resources and upload it here. Just wait it'll take a day to do.

Okay, I attached a demo project for you to learn from.

Re: Shooting and Collision Detection

Reply #17 – July 08, 2013, 02:54:35 am

Your the man!

Re: Shooting and Collision Detection

Reply #18 – July 08, 2013, 06:15:25 am

Noticed this

Code: (javascript) [Select]


var mw = GetLayerWidth(0) * GetTileWidth();
var mh = GetLayerHeight(0) * GetTileHeight();

Whats going on here?

Code: (javascript) [Select]


while (AreKeysLeft()) 
	{
		if (GetKey() == KEY_SPACE) CreateBullet("player");
	}

What function can I use to check only if the player has pressed the key down. I want it so that even if the space-bar is held continuously only one bullet is fired.

Re: Shooting and Collision Detection

Reply #19 – July 08, 2013, 06:31:14 am

Quote from: Xenso – on July 08, 2013, 06:15:25 am

Noticed this

Code: (javascript) [Select]
var mw = GetLayerWidth(0) * GetTileWidth();
var mh = GetLayerHeight(0) * GetTileHeight();
Whats going on here?

I haven't checked the script, but that gets you the size of the map in pixels. GetLayerWidth() and GetLayerHeight() get the size of a layer in tiles (assuming all layers are the same size here), so it has to be multiplied with the tile size itself.

Re: Shooting and Collision Detection

Reply #20 – July 08, 2013, 08:49:07 am

That makes sense now.

I found the functoin isKeyPressed(); in the API Functions list ( Sphere Wiki ), Is there an isKeyReleased function?
I was thinking of making a variable to assign itself to != isKeyPressed(); but I have a big feeling that's going overboard and will not work.
The variable will be too big and I think this would kill computer memory.

Is there a way to limit the shooting to one shot per button press? I replaced the while loop with this code but it made the shooting more like a flame-thrower than what I wanted. ( hmm I'll keep that in mind maybe for a power up

)

Code: (javascript) [Select]


//If the player presses space 
if (IsKeyPressed(KEY_SPACE)){ CreateBullet("Player")}

Re: Shooting and Collision Detection

Reply #21 – July 08, 2013, 12:29:53 pm

Quote from: Xenso – on July 08, 2013, 08:49:07 am

I was thinking of making a variable to assign itself to != isKeyPressed(); but I have a big feeling that's going overboard and will not work.
The variable will be too big and I think this would kill computer memory.

Wh... why would it be too big? A boolean variable takes up a couple bytes in memory, you have billions of bytes to work with...

Re: Shooting and Collision Detection

Reply #22 – July 08, 2013, 01:49:10 pm

Assigning a variable in a loop, just assigns the same data location over and over, it doesn't add more to memory. If computers were implemented that way we'd still be in the technological stone age!

To hit a key only once per click, the easiest way to do that is like this:

Code: [Select]


var key_hit = false;

function Update()
{
    if (IsKeyPressed(KEY_CTRL) && !key_hit)
    {
        do_something();
        key_hit = true;
    }
    if (!IsKeyPressed(KEY_CTRL)) key_hit = false;
}

Re: Shooting and Collision Detection

Reply #23 – July 09, 2013, 06:59:13 am

Code: (javascript) [Select]

var key_hit = false;

function Update()
{
UpdateBullets();
if (!IsKeyPressed(KEY_Z)) key_hit = false;

if (IsKeyPressed(KEY_Z) && key_hit == false)
{
key_hit = true;
CreateBullet("ghost");	
}

The code works perfect now. Thanks to all your help.