Sprite Collision/Hits not behaving as expected

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Mungkeh_Man

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Joined: 11th Apr 2012

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Posted: 12th Apr 2012 21:55

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I've had DB Pro for a week now and have managed to solve most problems as I go (eventually!) but this has me stuck.

The below loop was intend to drop a sprite (15) down the window and print it's number when I click on it with mouse, via a second sprite (1000) that is following it.

However, I only ever get "11" printed, where ever I click!

I appreciate sprite collision is the basis of every 2d game ever and it must work....but cannot see what am I doing wrong:

+ Code Snippet

sync rate 20

FOR y=15 to 200
   paste image 1,1,1 `background picture
   paste sprite 15,20,y `falling target sprite
   If MouseClick() = 1
      paste sprite 1000, Mousex(),Mousey()  `sprite attached to Mouse for collision detection
      print sprite hit(15,0)
   EndIf
   sync
NEXT y

Thank you in advance for any help whatsoever. I have not found any tutorial that covers this, but if anyone has a link to one I am not scared of self learning!

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Brendy boy

18

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Joined: 17th Jul 2005

Location: Croatia

Posted: 13th Apr 2012 00:58 Edited at: 13th Apr 2012 00:59

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shouldn't this

+ Code Snippet

print sprite hit(15,0)

be like this

+ Code Snippet

print sprite hit(15,1000)

BBB GUI Plugin
Landscape & Map Creator

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Mungkeh_Man

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Posted: 14th Apr 2012 12:04

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Thank you for the quick response.

As I understand it, that line is correct and leads to something else I have just discovered:

I am using "0" in the Sprite Hit to get the number of the target Sprite as there will be several of this sprite in the game and the player is to pick one.

Now...I have a For Loop that populates the Sprites from preloaded Images and guess what the loop starts counting at: 11.

When I change it to 12 the Sprite Hit prints 12. So it appears that the Sprite Hit is getting the number of first Sprite regardless of what is clicked on.

I am completely puzzled!

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Virtual Nomad

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18

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Joined: 14th Dec 2005

Location: SF Bay Area, USA

Posted: 15th Apr 2012 04:34 Edited at: 22nd Apr 2012 03:40

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Quote: "paste sprite 15,20,y `falling target sprite"

sprite collision works with sprites, not pasted sprites:

+ Code Snippet

sync on : sync rate 0
randomize timer()
draw sprites first

cls rgb(194,194,194)
   get image 1,0,0,32,32,1
   get image 2,0,0,1,1,1



   for spr = 1 to 10
      sprite spr, spr*40,40,1
      set sprite diffuse spr, rnd(255), rnd(255), rnd(255)
   next spr

      sprite 20,0,0, 2
      hide sprite 20

do


   mx = mousex() : my = mousey()

      sprite 20,mx, my, 2


   hit = sprite collision (20,0)

      center text mx, my+20, str$(hit)

   sync

loop

hope that helps

Virtual Nomad @ California, USA . DBPro V7.5
AMD Phenom™ X4 9750 Quad-Core @ 2.4 GHz . 8 GB PC2-6400 RAM
ATI Radeon HD 3650 @ 512 MB . Vista Home Premium 64 Bit

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Mungkeh_Man

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Joined: 11th Apr 2012

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Posted: 17th Apr 2012 21:10

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Thank you!

That fixed it, and it would have taken me forever to try that by guess work alone!

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