camera movements - GameCreators Forum

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dononeton

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Joined: 12th Jun 2004

Location: Tusaloosa, AL : USA

Posted: 1st Feb 2007 03:16

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+ Code Snippet

SH#=Screen Height()
SW#=Screen Width()

RTSCX#=camera position x(RTSCamera)
RTSCY#=camera position y(RTSCamera)
RTSCZ#=camera position z(RTSCamera)

function movecamera()

if mousey()=SH#
   position camera RTSCamera,RTSCX#,RTSCY#,RTSCZ#
endif

if mousex()=SW#
   move camera RTSCamera,1
endif

endfunction

I want to move the camera when the mouse hits the edge of the screen. The second if works but in the direction of the camera is facing

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dononeton

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Location: Tusaloosa, AL : USA

Posted: 1st Feb 2007 03:29 Edited at: 1st Feb 2007 03:38

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Well I got it. Forgot to put the variable in the function

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dononeton

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Posted: 1st Feb 2007 03:56

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New question. This code only works when the mouse cursor hits the top and the right sides of the screen. Any ideas?

+ Code Snippet

SH#=Screen Height()
SW#=Screen Width()

function movecamera()
   RTSCX#=camera position x(RTSCamera)
   RTSCY#=camera position y(RTSCamera)
   RTSCZ#=camera position z(RTSCamera)

if mousey()=SH#
   position camera RTSCamera,RTSCX#,RTSCY#+1,RTSCZ#
endif

if mousex()=SW#
   position camera RTSCamera,RTSCX#+1,RTSCY#,RTSCZ#
endif
endfunction

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TDK

Retired Moderator

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Location: UK

Posted: 1st Feb 2007 04:31

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What's with all the # symbols????

Do you know what they actually do?

TDK_Man

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dononeton

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Location: Tusaloosa, AL : USA

Posted: 1st Feb 2007 05:34 Edited at: 1st Feb 2007 05:41

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It makes the variable a float right? I guess I dont need them. I am moving in whole numbers anyway.SO the variable needs to hold int value. This my RTS Camera so far

+ Code Snippet

function movecamera()
   RTSCX=camera position x(RTSCamera)
   RTSCY=camera position y(RTSCamera)
   RTSCZ=camera position z(RTSCamera)

if mousey()=<5
   position camera RTSCamera,RTSCX,RTSCY-1,RTSCZ
endif

if mousex()=<5
   position camera RTSCamera,RTSCX+1,RTSCY,RTSCZ
endif

if mousey()=>475
   position camera RTSCamera,RTSCX,RTSCY+1,RTSCZ
endif

if mousex()=>635
   position camera RTSCamera,RTSCX-1,RTSCY,RTSCZ
endif
endfunction

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Pillarofire

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Location: Good Question, <looks around.>

Posted: 1st Feb 2007 07:03

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Might I point out that if you change screen resolutions your code will break. I would still use SH & SW

+ Code Snippet

margin = 5

`In main loop``````````````````
SH = screen height()
SW = screen width()
```````````````````````````````

function movecamera()
   RTSCX=camera position x(RTSCamera)
   RTSCY=camera position y(RTSCamera)
   RTSCZ=camera position z(RTSCamera)

if mousey()=< margin
   position camera RTSCamera,RTSCX,RTSCY-1,RTSCZ
endif

if mousex()=< margin
   position camera RTSCamera,RTSCX+1,RTSCY,RTSCZ
endif

if mousey()=> SH - margin
   position camera RTSCamera,RTSCX,RTSCY+1,RTSCZ
endif

if mousex()=> SW - margin
   position camera RTSCamera,RTSCX-1,RTSCY,RTSCZ
endif
endfunction

But thats just me because I would be too lazy to try and find those lines again when/if I changed screen resolutions.

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dononeton

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Location: Tusaloosa, AL : USA

Posted: 1st Feb 2007 14:53

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I know if I change my screen resolution my code will break. I couldn't get the movement when I put the cursor at the left side and the bottom. For some reason screen height() and screen width() are returning 0

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Pillarofire

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Posted: 1st Feb 2007 19:24

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Sorry I wasn't trying to be a jerk.

About screen height() and screen width() returning 0;
It is possible that SH and SW are zero because they are in a function and were not declared global. Are your sure that they are global?

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Kieran

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Location: Hamilton, New Zealand

Posted: 1st Feb 2007 19:28 Edited at: 1st Feb 2007 19:28

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no screen height() and screen width() return the right and bottom of the screen, you need two other variables saying the left and right which are

+ Code Snippet

if mousex()<0 then left = true
if mousey()<0 then top = true

screen height() returns the height of the screen, say your screen is 1024x768 screen height() returns 768 and screen width() returns 1024, when you add to the x variable it heads right when you add to the y variable it heads down

EDIT: if i need to explain further let me know

~Kieran

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dononeton

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Location: Tusaloosa, AL : USA

Posted: 2nd Feb 2007 01:32 Edited at: 2nd Feb 2007 05:28

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Thanks guys I wasn't thinking right

I re-wrote the function and it works just fine
here it is

+ Code Snippet

function RTS_Camera()
   RTSCX=camera position x(RTSCamera)
   RTSCY=camera position y(RTSCamera)
   RTSCZ=camera position z(RTSCamera)

if mousey()=>(screen height()-20)
   position camera RTSCamera,RTSCX,RTSCY,RTSCZ-2
endif

if mousey()<5
   position camera RTSCamera,RTSCX,RTSCY,RTSCZ+2
endif

if mousex()=>(screen width()-20)
   position camera RTSCamera,RTSCX+2,RTSCY,RTSCZ
endif

if mousex()<5
   position camera RTSCamera,RTSCX-2,RTSCY,RTSCZ
endif

if mousez()<0
   position camera RTSCamera,RTSCX,RTSCY-2,RTSCZ
endif

if mousez()>0
   position camera RTSCamera,RTSCX,RTSCY+2,RTSCZ
endif

endfunction

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TDK

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Location: UK

Posted: 2nd Feb 2007 06:22

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Quote: "It makes the variable a float right?"

Yes, that's right. (A lot of users actually think that putting the hash symbol on the end of a variable name simply makes it a number).

Sorry - I didn't make myself clear though. You don't need to make all your variables integers - just the ones that you know will never need to store floats.

Anything to do with 2D screen positions should be integer, but anything to do with 3D object positions should be floats.

This is because it's possible for your 3D world to be scaled so small that moving an object one 3D world unit makes it jump a large distance and appear not to move smoothly.

It's therefore perfectly normal to move an object say 0.01 world units. As this is a float number, then the variables used should also be of type float.

Even when using float variables, you can still use them to store whole numbers, but going by the book you should use 1.0 instead of 1 or 2.0 instead of 2. (It still works if you don't though).

TDK_Man

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