Sprites - Help!

Willpowered

By the way, you should be able to use removeSprite(sprite) to remove sprites that you're done with.

In Super Mega Arena Blaster I handle this by also creating a dummy sprite that symbolizes a free space.

For example, here's some pseudocode:

nullsprite = createSprite() // create a placeholder sprite

array enemies[10]
for i = 0 to len(enemies) loop
    // populate your enemies array here
repeat

// in your game loop...
for i = 0 to len(enemies) loop
    if enemies[i] != nullsprite then
        // do your enemy logic here
        if collideSprite(enemies[i], player).exists then
            removeSprite(enemies[i]) // delete the sprite...
            enemies[i] = nullsprite // ...and set it to null
        endif
    endif
repeat

Using a strategy like this, it's possible to make games with varying amounts of enemies / players / shots / etc. alive at any given time!

TheDearHunter

Could you post an example of how you are using collideMap to get detectSpriteCollision to work? I am also running into this issue where detection doesnt work if the collision shapes are hidden. Thanks

Willpowered

Sure thing! First, you'll need to create an empty map using the map editor. Then in your code you'll need to load it with loadMap(map_name) and call collideMap(my_sprite) to refresh the collision data.

Here's how I would update the swimmer collision example earlier in this thread to work around the problem:

map = loadMap("test") // Load an empty map created with the map editor.

img = loadImage("Untied Games/Swimmer A")

spr1 = createSprite()
setSpriteImage(spr1, img)
setSpriteAnimation(spr1, 14, 27, 10)
setSpriteCollisionShape(spr1, SHAPE_CIRCLE, 100, 100, 0)
spr1.x = 1920 / 4
spr1.x_speed = -100

spr2 = createSprite()
setSpriteImage(spr2, img)
setSpriteAnimation(spr2, 14, 27, 10)
setSpriteCollisionShape(spr2, SHAPE_CIRCLE, 100, 100, 0)
spr2.x = -1920 / 4
spr2.x_speed = 100
spr2.xscale = -1

setSpriteCamera(0, 0, 4)
centerSpriteCamera(0, 0)

while true loop
    
    clear(0, 0, 0, 0)

    // Colliding these sprites with an empty map will not affect them, but it will properly refresh their collision data.
    collideMap(spr1)
    collideMap(spr2)
    
    result = collideSprites(spr1, spr2)
    if result.exists then
        spr2.visible = false
    endif
    
    updateSprites()
    drawSprites()
    update()
    
repeat

TheDearHunter

Ah i was only calling collideMap once and not in my game loop. This helped, thank you!

Willpowered

Nice, glad you got it working! When I have an ETA on when the fix for this issue can be deployed, I'll let everyone know.

sys64738

I have a question about sprite animation.

I have a sprite that is animating through frames correctly when idling.

When I detect control input say c.right I set the sprite animation to the corresponding right direction frames. And set the location. The sprite is moving to the right but no longer animates until I stop pressing c.right. I assume each time I update the sprite location it's resetting the animation to it's first frame.

I've looked at example code and can't spot what I am doing wrong.

Discostew

@sys64738 the resetting of the animation is more likely from assigning the frame when detecting the key press.

sys64738

@Discostew yeah that's it. Trying to figure out best way to stop it retriggering. Guess a Boolean switch will do for now

pianofire

@Martin == vs = is the oldest trap in the book! Some compilers now warn you about this one

Martin

I don’t know why my brain just assumes because it’s basic, it’s should be a single = and somehow magically know the difference!

sys64738

Was this ever resolved. Just got collisions working in my latest project and then turned off show collision boxes. And well here I am with same problem as Martin.

Edit have loaded an empty map as above. And added


for x = 0 to 10 loop
collidemap(bubblesprite[x])
Collide = detectspritecollision(subsprite,bubblesprite[x])

And it works very occasionly for a bit then doesn't

Martin

I am told that it is resolved in the next patch that has been submitted for review.

It works 100% of the time for me when using what you have done. I do also collide subsprite with the map as well however. Maybe try that?

sys64738

@Martin oh brilliant that was the problem, I didn't collidemap the sub, so obvious in hindsight! thank you!