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[C++/SDL] Rotated image & collision detection


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#1 selve   Members   -  Reputation: 145

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Posted 27 March 2013 - 10:26 AM

Hi guys,
I want to know how to rotate an image and make a collision with another object like this:
en1ce3lkgnez.png

First collision it's just an easiest collision without rotating any image. When the ball collides with the square, the XVEL of the ball changes to
-XVEL.
Now the question for you: how to make a rotated image and collision with the ball that changes the xVelocity and yVelocity depending on the rotated image position.
 



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#2 Ludus   Members   -  Reputation: 970

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Posted 27 March 2013 - 03:47 PM

SDL does not support image rotation on its own, so you'll need to either write the code yourself or use a library such as SDL_gfx. As for collision detection, the best way is probably using Verlet intergration. There's an article on it here.



#3 Lightness1024   Members   -  Reputation: 702

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Posted 28 March 2013 - 10:00 AM

code for rotozooms of sdl gfx:

http://carnage-engine.git.sourceforge.net/git/gitweb.cgi?p=carnage-engine/carnage-engine;a=blob;f=carnage-engine/sdlrotozoom.cpp;h=7fd7941360eb107925426b18b7c0938eacbf58a2;hb=refs/heads/v2

 

how to compute intersections of rotated rectanges with circles or other rotated rectangles:

http://carnage-engine.git.sourceforge.net/git/gitweb.cgi?p=carnage-engine/carnage-engine;a=blob;f=carnage-engine/tools/geometry.cpp;h=d3dc4d81c53a0edd619fba84913a6d9b65ea6871;hb=refs/heads/v2






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