find sprite's pixel x and pixel y coordinates?

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xbandages

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Joined: 30th Mar 2010

Location: Michigan

Posted: 1st Apr 2010 23:54

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Is it possible to find each pixels x and y coordinates? I'm not asking about the sprite's location as a whole...just the individual pixels for each sprite, and I also want to exclude the transparent color (in my case R255,0G,B255).

thanks

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Cuddle Bunniezzz 12

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Joined: 14th Jan 2009

Location: Buffalo, NY

Posted: 2nd Apr 2010 01:30

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Well, there is no real pre-built in function to do that, but you could do something like this, to start out:

+ Code Snippet

int spriteX = dbSpriteX(spriteID);
int spriteY = dbSpriteY(spriteID);
for (int y = 0 + spriteY; y < dbSpriteHeight(spriteID) + spriteY; y++) {
    for (int x = 0 + spriteX; x < dbSpriteWidth(spriteId) + spriteX; x++) {
        // something here
    }
}

I'm away from the documentation right now, so I can't really do much to help other then this. Though I do think you may need to use mem-blocks.

Question:
Are you trying to create a pixel perfect collision system?

http://www.darkgdk.us/ <- You can now submit pages, upload images, yet were lacking content. We need your help!

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xbandages

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Joined: 30th Mar 2010

Location: Michigan

Posted: 2nd Apr 2010 02:06 Edited at: 2nd Apr 2010 02:20

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lol, yes i am. I think i'll be able to do it with the coordinates

Oh, and your code is what I i'll be doing once I can tell the difference between the sprites background and sprite itself.

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haliop

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Posted: 3rd Apr 2010 17:49

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what you should do is:

create a new clean bitmap (so you have a clean background)

+ Code Snippet

dbCreateNewBitmap(1); // also will assign it as the current bitmap
dbPasteImage(bla bla , i dont remmber);
dbLockPixel() ; // cant remmeber what should be inside


//using the loop written above by Cuddle
//inside the loop it should be something like this
dbSetCursor(x,j); // loop coordinates
if dbGetPixelColor()== backgroundcolor// of the current bitmap
//cause if its background color then its transparent
// do what ever , once you know its transpernt you can put it in array or somekind

// after loop

// you open the array with a loop , and then you can have all X,Y //coordinates of the Transpernt or non transpernt

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xbandages

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Location: Michigan

Posted: 3rd Apr 2010 18:25

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I think i'm gonna head in a new direction with this. Instead of checking for the sprites transparent background....I will instead check for their outline color (R39,G39,B3). I didn't think of this till I looked at a bunch of sprites I found online and realized they all had this kind of outline. I will just fill the array with 1's for outline (and maybe whats in between) and everything else w/ 0's. I currently have this working, but I'm kind of lost on the animations (how are they divided?).

Anyhow if you could elaborate a little more on the create new bitmap method, I'd be interested. Who knows, maybe my method is crap, lol.

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xbandages

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Posted: 3rd Apr 2010 18:28

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Also, would creating this new bitmap eachtime for the whole image cause a performance hit? My technique does a little bit when you are very close to the other object, but i'm sure I can fix that.

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