Stop sprite going off the screen...

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Dark Flame

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Joined: 15th Feb 2005

Location: England

Posted: 3rd Jun 2005 23:06 Edited at: 3rd Jun 2005 23:06

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I've decided to make a space invaders clone, I've got alot of experience in 3D so I thought I might try out some 2D..Anyway the problem is how do I stop my ship from going off the side of the screen...My code is below.

Thanks

+ Code Snippet

REM USUAL SETTINGS
Sync on
Sync Rate 30
Hide mouse
Backdrop on
Set display mode 800,600,32
Color backdrop rgb(0,0,0)

REM VARIABLES
score# = 0
milsec# = 40
lives = 3

REM LOAD AND POSITION THE SHIP
Load image "sprites/ship.jpg", 1
make object box 1,0.36,0.36,0
texture object 1,1
move object down 1,1

REM MAIN LOOP
Do

REM SCORE CODE
milsec# = milsec# - 1
If milsec# = 0 then
score# = score# + 20
if milsec# = 0 then milsec# = 40

REM PRINT SCORE AND LIVES
Set cursor 620,10
Print "Score ", score# ; "  Lives ", lives

If lives = 0 then goto gameover

REM CONTROLS
if leftkey()=1 then move object left 1, 0.07
if rightkey()=1 then move object right 1, 0.07

Sync
Loop

gameover:
Set Cursor 400,300
Print "GAME OVER"
Wait 3000
End

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Pricey

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Posted: 4th Jun 2005 02:37

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That is not 2D. You're using 3D objects.

:: 3Ghz Pentium 4 / Hyper Threading, 1024mb RAM, 160GB HDD, 256mb Radeon 9600XT Graphics ::
:: Current Project: Sea Bound ::

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Dark Flame

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Posted: 4th Jun 2005 08:40 Edited at: 4th Jun 2005 08:40

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What should i change to make it 2D?

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zenassem

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Joined: 10th Mar 2003

Location: Long Island, NY

Posted: 4th Jun 2005 09:15

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Something like this.

backdrop off
REM USUAL SETTINGS
Sync on
Sync Rate 30
Hide mouse
Set display mode 800,600,32
Color backdrop rgb(0,0,0)

REM VARIABLES
score# = 0
milsec# = 40
lives = 3

`alot of these values depend on the size of your image
ShipPosX=380
ShipPosY=500
MaxLeft=10
MaxRight=700

`LOAD AND POSITION THE SHIP
Load image "sprites/ship.jpg", 1 , 1
sprite 1,ShipPosX,ShipPosY,1
`Turn backsave off
set sprite 1,0,1

`main loop
do
cls 0: ` if you decide to draw the screen each time through the loop

`very basic movement code
if rightkey()=1 and ShipPosX>MaxLeft
inc ShipPosX,4
endif

if leftkey()=1 and ShipPosX<MaxRight
dec ShipPosX,4
endif

`position sprite to new location
sprite 1,ShipPosX,ShipPosY,1

REM SCORE CODE
milsec# = milsec# - 1
If milsec# = 0 then
score# = score# + 20
if milsec# = 0 then milsec# = 40

REM PRINT SCORE AND LIVES
Set cursor 620,10
Print "Score ", score# ; "  Lives ", lives

If lives = 0 then goto gameover

sync
loop

gameover:
Set Cursor 400,300
Print "GAME OVER"
Wait 3000
End

+ Code Snippet

backdrop off
REM USUAL SETTINGS
Sync on
Sync Rate 30
Hide mouse
Set display mode 800,600,32
Color backdrop rgb(0,0,0)

REM VARIABLES
score# = 0
milsec# = 40
lives = 3

`alot of these values depend on the size of your image
ShipPosX=380
ShipPosY=500
MaxLeft=10
MaxRight=700


`LOAD AND POSITION THE SHIP
Load image "sprites/ship.jpg", 1 , 1
sprite 1,ShipPosX,ShipPosY,1
`Turn backsave off
set sprite 1,0,1

`main loop
do
cls 0: ` if you decide to draw the screen each time through the loop

`very basic movement code
if rightkey()=1 and ShipPosX>MaxLeft
inc ShipPosX,4
endif

if leftkey()=1 and ShipPosX<MaxRight
dec ShipPosX,4
endif

`position sprite to new location
sprite 1,ShipPosX,ShipPosY,1



REM SCORE CODE
milsec# = milsec# - 1
If milsec# = 0 then
score# = score# + 20
if milsec# = 0 then milsec# = 40

REM PRINT SCORE AND LIVES
Set cursor 620,10
Print "Score ", score# ; "  Lives ", lives

If lives = 0 then goto gameover

sync
loop


gameover:
Set Cursor 400,300
Print "GAME OVER"
Wait 3000
End

~zen

http://www.mod2software.com

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Dark Flame

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Joined: 15th Feb 2005

Location: England

Posted: 4th Jun 2005 21:11 Edited at: 4th Jun 2005 21:14

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Thanks zenassem! But the ship still goes off off the screen and won't come back...

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comando 300

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Posted: 5th Jun 2005 02:37

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Try this:

+ Code Snippet


if ShipPosX<1
  ShipPosX=0
endif


if ShipPosX=>550
 ShipPosX=550
endif

[href]http://www.freewebs.com/comando_300/

[/href]

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zenassem

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Joined: 10th Mar 2003

Location: Long Island, NY

Posted: 5th Jun 2005 03:28

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I coded it backwards

And added the bits that commando 300 mentioned

the reason being is because i set the inc & dec to go by 4, So we need to bring it back in range.

+ Code Snippet

if rightkey()=1 and ShipPosX=<MaxRight
inc ShipPosX,4
if ShipPosX>MaxRight then ShipPosX=MaxRight
endif


if leftkey()=1 and ShipPosX>MaxLeft
dec ShipPosX,4
if shipPosX<MaxLeft then then ShipPosX=MaxLeft
endif

Then just change the value of MaxRight to coincide with how big your ship image is.

This will give you a start, but there are many things that go into 2D movement and animation. especially timing code, to keep everything smooth.

~zen

http://www.mod2software.com

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Dark Flame

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Location: England

Posted: 5th Jun 2005 04:35 Edited at: 5th Jun 2005 04:35

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Thanks again zenassem and comando 300!

I'm going to Work on shooting and some enemies.

Thanks

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NanoBrain

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Location: Portland, OR

Posted: 15th Jun 2005 09:59

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Dark Flame,

As an ender, and slightly off-topic, I would like to explain a short about 2D and 3D. The D stands for dimension(s). So, 2D means 2 dimensions, and 3D means 3 dimensions. 3D is drawn in, and able to be manipulated in 3 dimensions. Theses dimensions include the 3 axises of direction. One, up and down(y axis). Two, left and right(x axis). Three, fowards and backwards(z axis)(Note, that these axis are sometimes represented by different alpha characters in other programs).

In a 2D game, the objects can only go in two dimensions. Left-Right(x axis),Up-Down(y axis). You might already have this knowledge, but according to your quote "What should I change to make it 2D?", I figured I should throw in a simple explanation, just in case you didn't.

+NanoBrain+

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2D All the way! / Stop sprite going off the screen...