Sprite not moving correctly - GameCreators Forum

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kamac

13

Years of Service

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Joined: 30th Nov 2010

Location: Poland

Posted: 7th Aug 2012 18:29

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Hey there.

Could somebody please help me fix this code?
The idea is for the sprite to rotate to the mouse and move towards it. Everything works, except for the sprite to move perpendicular to the mouse.

Here are the images used in the project:

gra_bkg.jpg

guy.png

cursor.png

+ Code Snippet


hide mouse
set display mode 800,600,32
Load image "gra_bkg.jpg", 1
Load image "guy.png", 2
Load image "cursor.png", 3
sprite 1,0,0,1
sprite 2,400,300,2
sprite 3,0,0,3
offset sprite 2,12,20.5


do
	sprite 3,mousex(),mousey(),3
	angle=wrapvalue(atanfull(mousey()-sprite y(2),mousex()-sprite x(2)))
	rotate sprite 2,angle
	move sprite 2,0.02
	sync
	if keystate(1) = 1 then exit
loop



end

Anybody

?

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Hodgey

15

Years of Service

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Joined: 10th Oct 2009

Location: Australia

Posted: 8th Aug 2012 13:58

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Quote: " Everything works, except for the sprite to move perpendicular to the mouse."

You'll probably need to 'offset' the angle by 90 degrees.

Try either this:

+ Code Snippet

angle=wrapvalue(atanfull(mousey()-sprite y(2),mousex()-sprite x(2))-90.0)

or

+ Code Snippet

angle=wrapvalue(atanfull(mousey()-sprite y(2),mousex()-sprite x(2))+90.0)

Note the +- 90.0 to the value returned by atanfull.

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29 games

19

Years of Service

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Joined: 23rd Nov 2005

Location: not entirely sure

Posted: 8th Aug 2012 20:35

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Hodgey is right and I can confirm that it's the second suggestion, ie +90

+ Code Snippet

hide mouse
sync on
sync rate 60
`set display mode 800,600,32
`Load image "gra_bkg.jpg", 1
`Load image "guy.png", 2
`Load image "cursor.png", 3

`gra_bkg
box 0,0,10,10
get image 1, 0,0,10,10
cls
`guy
ink rgb(0,255,0),0
box 0,0,30,30
get image 2, 0,0,30,30
cls
`cursor
ink rgb(255,0,0),0
box 0,0,30,30
get image 3,0,0,30,30
ink rgb(255,255,255),0


sprite 1,0,0,1
sprite 2,400,300,2
sprite 3,0,0,3


offset sprite 2,15,15
offset sprite 3,15,15



do
	sprite 3,mousex(),mousey(),3
	angle=wrapvalue(atanfull(mousey()-sprite y(2),mousex()-sprite x(2))+90)
	rotate sprite 2,angle
	move sprite 2,1
	sync
	if keystate(1) = 1 then exit
loop



end

I've replaced the code where your loading images with just some boxes and modified the "angle" equation to add 90 degrees so you can just run the code.

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kamac

13

Years of Service

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Joined: 30th Nov 2010

Location: Poland

Posted: 9th Aug 2012 14:17

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Thanks, everything's fine now.

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