Moveing sprite at an angle - GameCreators Forum

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Simwad

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Joined: 9th Oct 2005

Location: Zoo Station

Posted: 1st Feb 2012 12:21

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I'm confused, if I use atanfull to rotate a turret in the middle of the screen, how would I shoot at that angle and move the bullet along.

I guess it's more math using cos and sin, I miss DBP's Move Sprite command

+ Code Snippet

x# = GetSpriteX ( 1 )
y# = GetSpriteY ( 1 )

mousex=GetPointerX()
mousey=GetPointerY()
Ang = atanfull(x# - mousex, y# - mousey)
Ang = Ang + 180
setSpriteAngle(1,Ang)

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baxslash

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Joined: 26th Dec 2006

Location: Duffield

Posted: 1st Feb 2012 13:35

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For percentage based system:

+ Code Snippet

function moveSprite(spriteID, amount#)
    a# = getSpriteAngle(spriteID)
    x# = getSpriteXbyOffset(spriteID)
    y# = getSpriteYbyOffset(spriteID)
    setSpritePositionByOffset(spriteID,x#+cos(a#)*amount#,y#+sin(a#)*amount#*getDisplayAspect())
endfunction

For pixel based system:

+ Code Snippet

function moveSprite(spriteID, amount#)
    a# = getSpriteAngle(spriteID)
    x# = getSpriteXbyOffset(spriteID)
    y# = getSpriteYbyOffset(spriteID)
    setSpritePositionByOffset(spriteID,x#+cos(a#)*amount#,y#+sin(a#)*amount#)
endfunction

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Simwad

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Joined: 9th Oct 2005

Location: Zoo Station

Posted: 2nd Feb 2012 12:15

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Wow thanks baxslash, very helpful indeed.

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baxslash

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Joined: 26th Dec 2006

Location: Duffield

Posted: 2nd Feb 2012 12:32

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I missed that command too

How about this one too:

+ Code Snippet

rem percentage
function moveSpriteUp(spriteID, amount#)
    a# = getSpriteAngle(spriteID)
    x# = getSpriteXbyOffset(spriteID)
    y# = getSpriteYbyOffset(spriteID)
    setSpritePositionByOffset(spriteID,x#+sin(a#)*amount#,y#-cos(a#)*amount#*getDisplayAspect())
endfunction

rem pixel
function moveSpriteUp(spriteID, amount#)
    a# = getSpriteAngle(spriteID)
    x# = getSpriteXbyOffset(spriteID)
    y# = getSpriteYbyOffset(spriteID)
    setSpritePositionByOffset(spriteID,x#+sin(a#)*amount#,y#-cos(a#)*amount#)
endfunction

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