Hi,

Based on these sprites :
http://www.tutoworld.com/temp/link_mouvement.bmp

I would like to make my character jumping

For the directions RIGHT and LEFT, I use rotate_sprite function and is works
but for the directions UP and DOWN, this function doesn't work.

If there any Allegro function to inclined a sprite ?

Is there another solution .

Thanks

In French :

Pouvez vous m'expliquer en français ?
Je n'ai pas compris ce que tu as dit mais ce que je souhaite faire c'est lorsque le personnage saute en direction UP ou DOWN, il faut incliner le sprite d'un certain pourcentage. (au milieu du saut il se retrouvera les pieds en l'air)
Enfin c'est pas facile à expliquer, il faudrait voir une vidéo :
http://www.youtube.com/watch?v=ExBK7RRuY-E (vers une minute)

If you want to understand my problem, please watch this video :
http://www.youtube.com/watch?v=ExBK7RRuY-E (one minute)

Thanks

J'utilise allegro 4.2.3 donc je n'ai pas ces fonctions...
J'utilise rotate_sprite (http://alleg.sourceforge.net/latestdocs/en/alleg014.html#rotate_sprite) qui fonctionne bien pour le saut dans les directions gauche et droite mais pour le haut et bas, c'est une autre histoire.
Bon je sais pas trop ce que je vais faire mais on verra...

Then this is a great opportunity to learn, isn't it?

In seriousness though: I think it's fine and great to help people who have difficulty with English in their native language. But please do provide an English translation, both for the benefit of people who don't speak the language and to help them improve their English.

rotate_sprite should in fact work similarly to al_draw_rotated_sprite so you can just substitute parameters that I discussed to get the same result

Dx, Dy, -> destination point
Cx, Cy -> point on bitmap that will rotate around Dx, Dy
angle -> angle of rotation in fixed or radians. (fixed means a circle has 256 degrees instead of 2Pi degrees or 360 degrees)

al_draw_rotated_bitmap(bmp,
Cx, Cy, Dx, Dy, angle, flags);

void rotate_sprite(buffer, bmp, Dx, Dy, fixed angle);

Shouldn't that work? It is supposed to rotate it around its center so you are only responsible for finding Dx Dy which you should do by using a vector to simulate physics and force

for example:

a simple triangle would yield

                   *(200,100, angle = Pi / 4)


*(0,200, angle = 0)             *(400,200,angle = 0)

You do not need Cx and Cy for rotate sprite because it already rotates around the center of the bitmap, whereas pivot sprite and al_draw_rotated_bitmap are more flexable and allow for a custom center.