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2D All the way! / Sprite Collision Help....

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Flindiana Jones
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Posted: 1st Dec 2005 02:07
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I can't seem to get the built in DarkBasic sprite collision to work. I dont care particularly about pixel perfection, I just want any sort of collision I can get. I try "sprite collision(49+i, 0) and it always returns 0, even when the sprite is on top of and under other sprites. Any ideas of what's wrong?

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Zergei
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Posted: 1st Dec 2005 03:04 Edited at: 1st Dec 2005 03:05
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Why 49+i?
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Grog Grueslayer
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Posted: 1st Dec 2005 10:49
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I just use a for/next loop to check all the sprites against the players sprite and it works fine (and seems to be just as fast)... i've never used zero.
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Flindiana Jones
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Posted: 1st Dec 2005 15:03
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49+i is the sprite number of the bullet I am currently checking in the while loop. And I have tried your approach, Grog, but that returns 0 also.

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Zergei
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Posted: 1st Dec 2005 15:42
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Could you show some more code?, maybe the mistake is somewhere else...
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Flindiana Jones
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Posted: 1st Dec 2005 20:48 Edited at: 2nd Dec 2005 00:20
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Here's the complete source + media.

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Peter H
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Posted: 2nd Dec 2005 00:46 Edited at: 2nd Dec 2005 01:41
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Here, i made a simpler form of the problem...

i've attatched a source file along with a image it needs to run... the image is 10*10 pixels...

why in the world does it say that sprite 1 is colliding with sprite 2 when they are on opposite sides of the screen and both of them are only 10*10????



"We make the worst games in the universe..."
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Zergei
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Posted: 2nd Dec 2005 01:02
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Peter_ , i work sprites in a diferent way... i don't use paste sprite, actually, i didn't even knew it existed. I just used sprite command to reposition it. Doing so, works fine the collision system.

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Peter H
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Posted: 2nd Dec 2005 01:23 Edited at: 2nd Dec 2005 01:25
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...

wow...
whole new worlds have been opened to me.

i thought that the sprite command was only for creating sprites... (as did flynn)

"We make the worst games in the universe..."
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Grog Grueslayer
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Posted: 2nd Dec 2005 10:23 Edited at: 2nd Dec 2005 10:26
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Quote: "why in the world does it say that sprite 1 is colliding with sprite 2 when they are on opposite sides of the screen and both of them are only 10*10????"


It's because both sprites are in the same position.



"paste sprite" is like using a stamp (the kind with ink). It stamps to the screen whatever the sprite currently looks like... but any sprite commands like collision only look at the sprites... not the stamps to the screen.

Paste sprite is good for quickly making tile maps without the slowdown of having 5000 sprites on the screen at the same time. The less sprites we use the faster everything goes.

Flindiana Jones uses paste sprite too... once it's changed to normal sprites the collision should work properly.
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Chilled Programmer 420
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Posted: 2nd Dec 2005 11:05
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i use the MOVE SPRITE spriteno, distance

this moves the specified sprite a specified differance along its leading edge

that is the top edge when they load

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Flindiana Jones
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Posted: 2nd Dec 2005 15:31
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Thanks so much Grog and Zergei! It works now... they should say something about that in the help files.

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Peter H
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Posted: 2nd Dec 2005 15:53 Edited at: 2nd Dec 2005 15:54
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yeah, what's funny is i've made entire 2D games without sprite collision (like Burnt Soil)

it would have saved me a lot of pain if they had explained this in the help files...

"We make the worst games in the universe..."
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Grog Grueslayer
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Posted: 2nd Dec 2005 21:58
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Quote: "Thanks so much Grog and Zergei! It works now... they should say something about that in the help files."


Np. Yeah if they change the information on paste sprite to include my stamp analogy I think it'd help people to understand paste sprite better.
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