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Citizen666

when 2 sprites collide - real newb. :)

7 posts in this topic

Hi all.

I'm trying to do something very simple as part of my learning XNA and am making a hash of it as usual. :)

Any help would be greatly appreciated.

So I've got a player controlled sprite that can move around the screen using the KB. All good.
I've now drawn a second stationary sprite on the right hand side of the screen.

What I'm trying to do is display a text message when the player controlled sprite moves over the stationary sprite.

I'm fine with the actual drawing of the text (I think) I just need to work out how to register that moveable Sprite A has indeed moved over stationary sprite B.

Thanks in advance,

Gigi.
:)
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yeh, I kind of understand the principle and logic behind the test etc - I just don't know the commands and the correct syntax to use.... Edited by Citizen666
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[quote name='Citizen666' timestamp='1348580500' post='4983575']
I just don't know the commands and the correct syntax to use....
[/quote]
I'll try to not read that as "please write my code for me" ;p

There isn't a specific command. You implement the algorithm in c#. The separating axis theorem is pretty heavy for what you're talking about though if you're still in an early learning stage. XNA has built in "Bounding_______" structures, you probably just want to create a BoundingBox for each sprite, and then use the built-in BoundingBox.Intersects() method to check for collision/overlap. This [i]can[/i] result in some wierd effects if the sprite has a detailed or convex shape that leaves a lot of space in the BoundingBox, but it's a start, and the size of the box can always be tweaked.

Just remember to update the bounding boxes' locations in addition to the sprites' locations when you do your update logic.
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These examples from the education catalog are a good place to start, they should show you what you're looking for:

[url="http://xbox.create.msdn.com/en-US/education/catalog/tutorial/collision_2d_rectangle"]Rectangle collision[/url]

[url="http://xbox.create.msdn.com/en-US/education/catalog/tutorial/collision_2d_perpixel"]Per-Pixel collision[/url]
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Well, in SFML you set floatrects (Rectangles that can have coordinates that are floating point values) up around the sprite.
Something along the lines of:
[CODE]
sf::floatrect floatrect1;
sf::floatrect floatrect2;
//
// SET FLOATRECTS COORDS TO SPRITES
//
if (floatrect1.Intersects(floatrect2))
{
//COLLISION
}
[/CODE]
if there isn't an intersect function for bounding boxes, write your own using the coordinates of the floatrects.
(I didn't write down the specific code because I didn't have time, also you might not know SFML/C++) Edited by superman3275
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