How to make Sprites Move Smoothly

Lachiepower0402

Hi,

Could anyone please tell me how to make sprites smoothly, for example my project is a car and at the moment I have it set to

Change x by -10 to go left

Change x by 10 to go right

But when I do this the car moves in steps.

zanzolo

One way would be something like this: It moves by one pixel at a time, and does it 10 times

when green flag clicked
forever
    
if <key [left arrow] pressed?> then
    
repeat (10)
    
change x by (-1)
end
end
if <key [right arrow] pressed?> then
   repeat (10)
    
change x by (1)
end 
end

end

lifesalibrary4me

I just use the glide __ seconds to x:__ y:__, but that’s just because I do animations. If you are doing a game it would be harder.

zanzolo

lifesalibrary4me wrote:
I just use the glide __ seconds to x:__ y:__, but that’s just because I do animations. If you are doing a game it would be harder.

Glides are great for somethings.

I don't like them for games though because once you start a glide you pretty much have to finish it.

Lachiepower0402

The first post works quite well but it is too slow for what I am doing, is their any way to have the same thing but faster?

AonymousGuy

Lachiepower0402 wrote:
The first post works quite well but it is too slow for what I am doing, is their any way to have the same thing but faster?

Try the following:

when gf clicked
forever
if <key [right arrow v] pressed?> then
change x by (10)
end
if <key [left arrow v] pressed?> then
change x by (-10)
end
end

The sprite will jump by 10 pixels each time, but it should look smooth because it is in a continuous loop.

The sprite can go faster or slower by changing the amounts.

Lachiepower0402

Thanks that works perfectly, but I have another question. In this same game the car passes brick walls that are moving past the car, how can I make it so that when the car misses a brick wall their is a score that shows this?

AonymousGuy

It depends on how the walls are moving. Is the car sprite staying in the center of the screen, with the wall sprites moving? If so, then you can do something like this:

when gf clicked //In the car sprite
set [Score v] to [0]//This is a variable. If you don't know what this is, refer to bottom section.
forever
if <([x position v] of [brick_wall v]) < (x position)> then
change [Score v] by (1) 
end
end

Variable explanation: If you don't yet know what a variable is, you can create one by going to the Data tab and clicking “Create Variable”, then naming it what you want (in this case, Score.) Variables are basically just values that can be rewritten and reused, so their value will be read and used instead of a manually input value. (If that makes sense.)

Also, if this isn't the method your game is using, please say so, as I can give a more helpful script. It will probably be somewhat similar to this script anyways.

Lachiepower0402

No sorry that didn't work, the car sprite moves left and right along the screen and a wall comes down from the top of the screen to the bottom, hides, reappers at the top in a different spot and goes down again and the car has to avoid the wall otherwise a background comes up saying game over. So for every wall the car doesn't hit I want the score to go up by one. What happened just then was when I avoided a wall the score when up very quickly to a high number i.e. 17931724.

AonymousGuy

Lachiepower0402 wrote:
No sorry that didn't work, the car sprite moves left and right along the screen and a wall comes down from the top of the screen to the bottom, hides, reappers at the top in a different spot and goes down again and the car has to avoid the wall otherwise a background comes up saying game over. So for every wall the car doesn't hit I want the score to go up by one. What happened just then was when I avoided a wall the score when up very quickly to a high number i.e. 17931724.

Okay, so I think that means that the x position blocks just have to be changed to y position blocks:

when gf clicked //In the car sprite
set [Score v] to [0]//This is a variable. If you don't know what this is, refer to bottom section.
forever
if <([y position v] of [brick_wall v]) < (y position)> then
change [Score v] by (1) 
end
end

Lachiepower0402

That is a lot better, but the score doesn't just go up by 1, when the wall passes the car the scores goes up until the wall disappears, so the wall moves from the top goes down and passes the car as i avoid it and the score goes up when moving past the car and then the wall moves to the top again.

AonymousGuy

Add the following after the block changing the score:

wait until <not <([y position v] of [brick_wall v]) < (y position)>>

Lachiepower0402

That works, thank you.

AonymousGuy

Lachiepower0402 wrote:
That works, thank you.

You're welcome!

Ninjai

LOL

Sewell1706

wow,u guys are a pretty smart pair

lederniersamourai

zanzolo wrote:
lifesalibrary4me wrote:
I just use the glide __ seconds to x:__ y:__, but that’s just because I do animations. If you are doing a game it would be harder.

Glides are great for somethings.

I don't like them for games though because once you start a glide you pretty much have to finish it.

glide can be interrupted any time: just put them under an “event hat” such as this one:

when I receive [glide1 v]
glide (sec var) secs to x: (x var) y: (y var)

Just set variable to new values to glide on another path and schedule, and then use neutral values (i.e. 0 secs, current x value and current y value) for stopping gliding,

Cyoce

when green flag clicked
forever
set [X v] to (where you want the sprite's X to be)
set [Y v] to (where you want the sprite's Y to be)
if <something causes it to stop the glide> then
   set [X v] to (x position)
   set [Y v] to (y position)
else


change x by (((X) - (x position)) * ([abs v] of (((X) - (x position)) / ([abs v] of (((X) - (x position)) + ([abs v] of ((Y) - (Y position)
change y by (((Y) - (y position)) * ([abs v] of (((Y) - (Y position)) / ([abs v] of (((X) - (x position)) + ([abs v] of ((Y) - (Y position)
end

-appletree-

when green flag clicked
forever
    
if <key [right arrow v] pressed?> then
change x by (4)
    
end

end

REPUS

This script will make a sprite glide to a place ten steps over, instead of simply reappearing in a place ten steps over.

when [ Left arrow] key pressed
glide (0.3) secs to x: ((-10) + (x position)) y: (y position)

when [ Right arrow] key pressed
glide (0.3) secs to x: ((10) + (x position)) y: (y position)

Last edited by REPUS (Nov. 11, 2014 02:52:04)

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