Sprite not moving correctly - GameCreators Forum

Author

Message

kamac

13

Years of Service

User Offline

Joined: 30th Nov 2010

Location: Poland

Posted: 7th Aug 2012 18:29

Link

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

?

Follow me on twitter! @MotionStruct
Motion Struct blog

Back to top

Profile PM Email

Hodgey

15

Years of Service

User Offline

Joined: 10th Oct 2009

Location: Australia

Posted: 8th Aug 2012 13:58

Link

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.

Back to top

Profile PM Email

29 games

18

Years of Service

User Offline

Joined: 23rd Nov 2005

Location: not entirely sure

Posted: 8th Aug 2012 20:35

Link

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.

Back to top

Profile PM Email

kamac

13

Years of Service

User Offline

Joined: 30th Nov 2010

Location: Poland

Posted: 9th Aug 2012 14:17

Link

Thanks, everything's fine now.

Follow me on twitter! @MotionStruct
Motion Struct blog

Back to top

Profile PM Email

Sorry your browser is not supported!

Newcomers DBPro Corner / Sprite not moving correctly