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BeastDeath

13

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Joined: 7th Jul 2011

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Posted: 1st Nov 2011 00:52

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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

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Darkzombies

13

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Joined: 25th Dec 2010

Location: In multiple tabs, most likely youtube.

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

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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.

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Hodgey

15

Years of Service

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Joined: 10th Oct 2009

Location: Australia

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

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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.

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nonZero

13

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Joined: 10th Jul 2011

Location: Dark Empire HQ, Otherworld, Silent Hill

Posted: 1st Nov 2011 10:27

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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

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BeastDeath

13

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Joined: 7th Jul 2011

Location:

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

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Edit: Fixed my problem, thanks

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