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Newcomers DBPro Corner / Vertical Scrolling Stars

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Hells Messenger
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Posted: 2nd Jul 2004 13:17 Edited at: 2nd Jul 2004 13:18
Hey, I've just finished going through the DBP "Tutorial 8 - 2D Star Fields" and the stars move from the right side of the screen to the left, but i was wondering how can i get the stars to move from the top of the screen to the bottom instead of from right to left?

Help please. Chris

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BatVink
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Posted: 2nd Jul 2004 21:19
Haven't seen the code, but I guess it's just a matter of changing the x offset to a y offset.

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Hells Messenger
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Posted: 2nd Jul 2004 21:50
The code is:

Rem Project: QuickStart Tutorial 8 - 2D Starfields
Rem Created: 05/02/2003 23:50:39

Rem ***** Main Source File *****

sync rate 0
sync on
hide mouse

load image "media/logo.png",1,1

starquantity = 400
starlayers = 5
speedfactor# = 0.75

` Here we'll setup our starfield type
type starfield

X AS FLOAT
Y AS FLOAT
Z AS INTEGER
speed AS FLOAT
color AS DWORD

endtype

` Now let's create some stars
dim stars(starquantity) as starfield

` We need to give each star a location, colour and depth
for s=0 to starquantity

stars(s).x = rnd(800)
stars(s).y = rnd(600)
stars(s).z = int(s/(starquantity/starlayers))+1
stars(s).speed = stars(s).z * speedfactor#
temp_col = (255/starlayers) * stars(s).z
stars(s).color = rgb(temp_col, temp_col, temp_col)

next s

set sprite 1,0,1

` Now our main loop!
repeat

cls 0

for s=0 to starquantity

sx# = stars(s).x
dot sx#, stars(s).y, stars(s).color
sx# = sx# - stars(s).speed
if sx# < 0 then sx# = 800
stars(s).x = sx#

next s

sprite 1,200,182,1
sync

until spacekey()=1

end

But i just can't seem to get it to go from the top of the screen to the bottom. Help? Chris

Goverment... is just another way to say Better, Than, You!
EvilJason
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Posted: 2nd Jul 2004 22:31
Near the bottom with stars(s).x and stars(s).y just change them around to

sx# = stars(s).y
dot sx#, stars(s).x, stars(s).color
sx# = sx# - stars(s).speed
if sx# < 0 then sx# = 800
stars(s).y = sx#

See if that works

-EvilJayson
Hells Messenger
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Posted: 2nd Jul 2004 23:18
Nope it doesnt change anything except i think it changes the colour of the stars. But its still going from right to left. Chris


Goverment... is just another way to say Better, Than, You!
EvilJason
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Posted: 2nd Jul 2004 23:36
I get it ok do this code

for s=0 to starquantity

sy# = stars(s).y
dot stars(s).x, sy#, stars(s).color
sy# = sy# - stars(s).speed
if sy# < 0 then sx# = 600
stars(s).y = sx#

next s

the 800 now 600 is for the screen res you know 800*600

Try that

-EvilJayson
Hells Messenger
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Posted: 2nd Jul 2004 23:47
No still not working that just give me a straight line of stars accross the top of the screen, and there not moving just frooze, hmmmmmm. Chirs

Goverment... is just another way to say Better, Than, You!
EvilJason
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Posted: 2nd Jul 2004 23:58
Strange you see the line

dot sx#, stars(s).y, stars(s).color

this line is the line that places the dot

the command is dot x,y,color

so if you want to move them down the screen you need to take away from the y posion which is what this line does

sx# = sx# - stars(s).speed

maybie chnage the - to a + ? and the line to dot stars(s).x,sx#,stars(s).color

the line

sx# < 0 then sx# = 800

wrapes the stars posision to the other end of the screen but because the screen is 800 long but 600 high you need to change to 600

the next line is to save the current stars new posision because sx# is reused next loop

stars(s).x = sx#

This is all i can do now, see if you wrote down something different k

Jope it helps

-EvilJayson
Hells Messenger
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Posted: 3rd Jul 2004 00:16
no still not wel its gettin there the stars shoot dwn from the top left to bottom right once then no more in a straight line, bummer really the tutorial says its a simple change yet i can't seem to do it...lol thanks anyway EvilJason. Chris

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Hells Messenger
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Posted: 3rd Jul 2004 00:24
lol...i've just realised thats mae the stars go the oposit way so instead of going right to left, they now go left to right. Chris

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Hells Messenger
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Posted: 3rd Jul 2004 03:00
anyone else know how i could achive this? by makeing the stars move from top to the bottom rarther than left to right/right to left? Chris

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IanM
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Posted: 3rd Jul 2004 05:06
Sure. Just switch all the x's for y's and vice versa in the main loop, add the speed instead of subtract it (to move the stars down the screen rather than up), and when they reach the bottom, move them back to the top.



I'm just using a dot here instead of an image, coz I couldn't be bothered to locate any media

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Hells Messenger
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Posted: 3rd Jul 2004 11:36
Hey IanM, thanks that worked thanks for the help people i was stuck but not anymore..hahaha cheers. Chris

Goverment... is just another way to say Better, Than, You!

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