Scratch

Geek773 wrote:

Hey, everyone. I'm using scratch to make a Space Invaders game. I want the bullet (this sprite) to glide straight up, even when the gun moves from left to right. But the only command I can find is to send it to one location, no command to allow me to say "If Sprite 1 is here, Sprite 2 goes here when up arrow is pressed." My code is this:

when [up arrow v] key pressed
go to (Sprite1)
show
play sound (Laser1)
glide (1) secs to x: (2) y: (180)
hide
go to (Sprite1)

I can see my current code sends the bullet from the "gun" sprite to the on point at the top-middle of the screen, but I don't know how to add an "if" instruction to vary this finishing point. Please help!

-Geek

Well, from what I see, you just need some to alter your script so that it'd actually move upwards, correct? Then this is a simple change:

when [up arrow v] key pressed
go to [Sprite1 v]
show
play sound [Laser1 v]
repeat until (touching [edge v]?)
 change y by (1)//Increase 1 for a faster speed.
end
hide
go to [Sprite1 v]

Last edited by ErnieParke (2013-01-22 15:19:12)

I have a question about scrolling. How do you program it to make the sprite stay in the middle or to the left of the screen but the screen is scrolling to the right?
Or just how to you make a scrolling screen? Cause several projects I'm working on really could use the scrolling technic.

sparky2008123 wrote:

I have a question about scrolling. How do you program it to make the sprite stay in the middle or to the left of the screen but the screen is scrolling to the right?
Or just how to you make a scrolling screen? Cause several projects I'm working on really could use the scrolling technic.

As for staying in a certain position, just don't make is scroll and have it go to where it needs to be, say (89, 89). As for scrolling, you'll need two variables called ScrollX (for scrolling left/right), and ScrollY (for scrolling up/down). Now, make it so that each ueses this script:

when gf clicked
forever
 go to x: ((ScrollX) + [Offset (240 for half-screen)]) y: ((ScrollY) + [Offset (180 for half-screen)])

ErnieParke wrote:

Geek773 wrote:

Hey, everyone. I'm using scratch to make a Space Invaders game. I want the bullet (this sprite) to glide straight up, even when the gun moves from left to right. But the only command I can find is to send it to one location, no command to allow me to say "If Sprite 1 is here, Sprite 2 goes here when up arrow is pressed." My code is this:

when [up arrow v] key pressed
go to (Sprite1)
show
play sound (Laser1)
glide (1) secs to x: (2) y: (180)
hide
go to (Sprite1)

I can see my current code sends the bullet from the "gun" sprite to the on point at the top-middle of the screen, but I don't know how to add an "if" instruction to vary this finishing point. Please help!

-Geek

Well, from what I see, you just need some to alter your script so that it'd actually move upwards, correct? Then this is a simple change:

when [up arrow v] key pressed
go to [Sprite1 v]
show
play sound [Laser1 v]
repeat until (touching [edge v]?)
 change y by (1)//Increase 1 for a faster speed.
end
hide
go to [Sprite1 v]

I hope that this helps! Also, hello Geek773 and welcome to Scratch! I wish you a head-start in your adventure to learn how to program!

Urm...... tried this but didn't work? There's no "glide" script so that the sprite actually moves - all I think I need are some "if" scripts, so that if "Sprite1" (the moving gun in my space invaders game) is in one position, "Sprite2" would fire straight up, as opposed to always to top-middle, like it does right now. The current glide code (see my previous code) works fine when the gun is in the middle, but when I move it (by using the arrow keys) it still fires to top middle. I think I need something like this:

when [up arrow] key pressed
go to [Sprite1]
show
play sound [Laser1]
if
glide [1] secs to x: [170] y: [180]
if
glide [1] secs to x: [2] y: [180]
if
glide [1] secs to x: [-170] y: [180]

Geek773 wrote:

Geek773 wrote:

ErnieParke wrote:

Well, from what I see, you just need some to alter your script so that it'd actually move upwards, correct? Then this is a simple change:

when [up arrow v] key pressed
go to [Sprite1 v]
show
play sound [Laser1 v]
repeat until (touching [edge v]?)
 change y by (1)//Increase 1 for a faster speed.
end
hide
go to [Sprite1 v]

I hope that this helps! Also, hello Geek773 and welcome to Scratch! I wish you a head-start in your adventure to learn how to program!

Urm...... tried this but didn't work? There's no "glide" script so that the sprite actually moves - all I think I need are some "if" scripts, so that if "Sprite1" (the moving gun in my space invaders game) is in one position, "Sprite2" would fire straight up, as opposed to always to top-middle, like it does right now. The current glide code (see my previous code) works fine when the gun is in the middle, but when I move it (by using the arrow keys) it still fires to top middle. I think I need something like this:

when [up arrow] key pressed
go to [Sprite1]
show
play sound [Laser1]
if
glide [1] secs to x: [170] y: [180]
if
glide [1] secs to x: [2] y: [180]
if
glide [1] secs to x: [-170] y: [180]

Great - now I just need something to go with my "if"s relating to the position of a DIFFERENT sprite - and the first part of my game will work!

Please help!

-Geek 

Done it! Problem solved with following code:

when [up arrow] key pressed
go to [Sprite1]
show
play sound [Laser1 v]
if <([x position v] of [Sprite1 v]) = [170]>
   glide [1] secs to x: [170] y: [180]
end
if <([x position v] of [Sprite1 v]) = [0]>
   glide [1] secs to x: [2] y: [180]
end
if <([x position v] of [Sprite1 v]) = [-170]>
   glide [1] secs to x: [-170] y: [180]
end
hide
go to [Sprite1 v]

Hurrah! No more replies needed :p

You do know that that could've been simplified inot this?

when [up arrow] key pressed
go to [Sprite1]
show
play sound [Laser1 v]
   glide [1] secs to x: ([x position v] of [Sprite1 v]) y: [180]
hide
go to [Sprite1 v]

Hey everyone! Space Invaders game problems - part 2!|-( Gun shoots at target sprites - so I've tried to use this code to get the target sprites to "die" (hide and play a noise) when they get hit by the bullet sprite:-

if <(touching [Sprite2])>
      hide
      play sound (Laser2)

Auto007 wrote:

Geek773 wrote:

Hey everyone! Space Invaders game problems - part 2!|-( Gun shoots at target sprites - so I've tried to use this code to get the target sprites to "die" (hide and play a noise) when they get hit by the bullet sprite:-

if <(touching [Sprite2])>
      hide
      play sound (Laser2)

But for no apparent reason, the script just won't do anything, the sprites get hit by the bullet while its gliding, but stay where they are as if nothing happened!

Please help!

-Geek 

put it in forever loop , that u r using for ur "gliding" sprite.

Thank you - this solved the problem! 

-Geek 

Geek773 wrote:

Hey, everyone. I'm using scratch to make a Space Invaders game. I want the bullet (this sprite) to glide straight up, even when the gun moves from left to right. But the only command I can find is to send it to one location, no command to allow me to say "If Sprite 1 is here, Sprite 2 goes here when up arrow is pressed." My code is this:

when up arrow key pressed
go to (Sprite1)
Point in direction ([direction v] of [sprite arrow v])
show
play sound 
Repeat until <<touching [edge v]> or <touching [invader v]>>
Move [10] steps
End
hide
go to (Sprite1)

I can see my current code sends the bullet from the "gun" sprite to the on point at the top-middle of the screen, but I don't know how to add an "if" instruction to vary this finishing point. Please help!

-Geek

Last edited by Aditya007 (2013-01-27 02:47:49)

sparky2008123 wrote:

I have a question about scrolling. How do you program it to make the sprite stay in the middle or to the left of the screen but the screen is scrolling to the right?
Or just how to you make a scrolling screen? Cause several projects I'm working on really could use the scrolling technic.

Just don't take a background, take sprites which will be moving as the background, check the scrollingDemo in the sample projects of scratch 1.4

ErnieParke wrote:

Auto007 wrote:

How can i make a Sprite go elliptical orbit ?

Well, there are two ways. Do you want the more complicated (math wise), more easily edited version or the simpler, harder to edit version?

Gosh !! You always confuse me . Here and in idea shop also !
Can't you tell me both methods ?

Hello All!
I am making Pacman and I am about done with it, yet I just need to tweak one minor detail. I have walls in my game but I can't seem to find the right script to make the pacman stop when it gets to the wall. ie. it passes through the wall. Please note that one side of my wall is the edge, yet one side is not part of the edge.

Thanks, but the wall is part of my background. Also, by movement script, do you mean "move 10 steps"