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cold_heats_.--.

Direction vector

3 posts in this topic

Me again, with another question.
Suppose I have two sprites on screen, sprite A at position (3,5) sprite B at (8,10).I want sprite B to move towards A with the speed of 1 pixel per second.
So I calculate the direction vector from B to A : dir=B-A=(5,5) . Its length "L" will be sqrt(5*5+5*5)=sqrt(50).
I normalize it dir=(5/L, 5/L).The components will now be : dir =(0.7,0.7) .I multiply each by the speed, but in this case they will stay the same.
I update the new position B(8.7,10.7) but the components will have to be type casted to int when I call SDL_BlitSurface().So going by my logic, sprite B will always stay at the same position.
What am I doing wrong ?
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Will it?
next frame, the values should be (9.4,11.4) and at that point it will have moved.
Unless you for some reason destroy the value when you typecast. Edited by Olof Hedman
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lol, I read 2/3 of your post and thought this guy knows what he's talking about. What could be the problem :P

Same answer as the above. Just keep looking, it will move :P

Good luck man :)
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