Old Position - GameCreators Forum

Author

Message

BeastDeath

12

Years of Service

User Offline

Joined: 7th Jul 2011

Location:

Posted: 1st Nov 2011 00:52

Link

Hello everyone (sorry for such a soon post) I'm struggling to get my head around how I would get the old positions in this code, how would I do it? My player never moves everything else does, so I need to get all the previous positions of everything else before they moved exactly before, not between each pressed on the keyboard

Here is example code:

Sync On : Sync rate 60

Type Objects
    id as Integer
    img as Integer
    xpos as Integer
    ypos as Integer
EndType

Global Map as Objects
Global Player as Objects

Player.id = 501
Player.img = 501
Player.xpos = screen width() / 2
Player.ypos = screen height() / 2
Map.id = 500
Map.img = 500
Map.xpos = 0
Map.ypos = 0

Load Image "player.png", Player.img
Load Image "background.png", map.img

Draw sprites first

Sprite Player.id, Player.xpos, Player.ypos, Player.img
Sprite Map.id, Map.xpos, Map.ypos, Map.img

Do
    text 20, 20, "map.xpos: " + Str$(Map.xpos) + " map.ypos:" + Str$(Map.ypos)
    UpdateWorld()
    RenderWorld()
    
    Sync
Loop

Function UpdateWorld()
    
    if upkey() = 1
        dec Map.ypos, 2    
    Endif
    
    if downkey() = 1
        inc Map.ypos, 2    
    Endif
    
    if leftkey() = 1
        dec Map.xpos, 2    
    Endif
    
    if rightkey() = 1
        inc Map.xpos, 2    
    Endif
    
Endfunction

Function RenderWorld()
    Sprite Player.id, Player.xpos, Player.ypos, Player.img
    Sprite Map.id, Map.xpos, Map.ypos, Map.img
Endfunction

+ Code Snippet

Sync On : Sync rate 60


Type Objects
    id as Integer
    img as Integer
    xpos as Integer
    ypos as Integer
EndType


Global Map as Objects
Global Player as Objects



Player.id = 501
Player.img = 501
Player.xpos = screen width() / 2
Player.ypos = screen height() / 2
Map.id = 500
Map.img = 500
Map.xpos = 0
Map.ypos = 0

Load Image "player.png", Player.img
Load Image "background.png", map.img

Draw sprites first

Sprite Player.id, Player.xpos, Player.ypos, Player.img
Sprite Map.id, Map.xpos, Map.ypos, Map.img

Do
    text 20, 20, "map.xpos: " + Str$(Map.xpos) + " map.ypos:" + Str$(Map.ypos)
    UpdateWorld()
    RenderWorld()
    
    Sync
Loop

Function UpdateWorld()
    
    if upkey() = 1
        dec Map.ypos, 2    
    Endif
    
    if downkey() = 1
        inc Map.ypos, 2    
    Endif
    
    if leftkey() = 1
        dec Map.xpos, 2    
    Endif
    
    if rightkey() = 1
        inc Map.xpos, 2    
    Endif
    
Endfunction

Function RenderWorld()
    Sprite Player.id, Player.xpos, Player.ypos, Player.img
    Sprite Map.id, Map.xpos, Map.ypos, Map.img
Endfunction

Back to top

Profile PM

Darkzombies

13

Years of Service

User Offline

Joined: 25th Dec 2010

Location: In multiple tabs, most likely youtube.

Posted: 1st Nov 2011 02:02 Edited at: 1st Nov 2011 02:03

Link

use sprite x(sprite number) and sprite y(sprite number) after changing the .x and .y data of the object.

EG.

+ Code Snippet

player.x = sprite x(player.id)

Also, render can go straight in at the end of update world, it will work the same.

Back to top

Profile PM Email

Hodgey

14

Years of Service

User Offline

Joined: 10th Oct 2009

Location: Australia

Posted: 1st Nov 2011 02:06 Edited at: 1st Nov 2011 02:10

Link

This would be all about where in your code you store the x and y values. Take this code for instance:

+ Code Snippet

sync on : sync rate 60
x as integer
oldx as integer

do
    // store old x value
    oldx = x
    
    // incrase the x value
    inc x, 1
    
    print "Oldx: ", oldx
    print "X: ", x
    print
    wait key
    sync
LOOP

This stores the old x value so it's really up to you to decide when and how often you want to store that old x value.

Hope this helps

Edit: Forgot to mention that it does depend on when you change the x and y values. You'll need to collect the 'old' x and y values before you change them.

Back to top

Profile PM Email

nonZero

12

Years of Service

User Offline

Joined: 10th Jul 2011

Location: Dark Empire HQ, Otherworld, Silent Hill

Posted: 1st Nov 2011 10:27

Link

Hodgey is right. My personal suggestion is to use it like this:

+ Code Snippet

Function UpdateWorld()
    
    if upkey() = 1
        Map.ypos = Sprite Y(Map.ypos) - 2    
    Endif
    
    if downkey() = 1
        Map.ypos = Sprite Y(Map.ypos) + 2
    Endif
    
    if leftkey() = 1
        Map.xpos = Sprite X(Map.xpos) - 2
    Endif
    
    if rightkey() = 1
        Map.xpos = Sprite X(Map.xpos) + 2
    Endif
    
Endfunction

As this will save 4 lines of code and perform the update JUST before repositioning.

Round Phoenix Software Studios

Back to top

Profile PM Email Website

BeastDeath

12

Years of Service

User Offline

Joined: 7th Jul 2011

Location:

Posted: 1st Nov 2011 12:47 Edited at: 1st Nov 2011 18:58

Link

Edit: Fixed my problem, thanks

Back to top

Profile PM

Sorry your browser is not supported!

Newcomers DBPro Corner / Old Position