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# Tutorial:Cosine

Some sine and cosine program. Check it out. More of example code, but useful anyway.

Note that this is code for Fenix versions 0.93 and up. Should the code work for other versions as well, be so kind to note this here.

##  Example code

```Program cosine;
Const
seconds       = 2.3;
ball_width    = 20;
ball_height   = 20;
screen_width  = 320;
screen_height = 200;
screen_depth  = 8;
screen_fps    = 60;
cos_factor    = 2000;
sin_factor    = 4000;
timer_spawn   = 0;
timer_ball    = 1;
Begin

// make the movement a bit more smooth
set_fps(screen_fps,0);

// spawn a ball process every <seconds> seconds with random colors.
timer[timer_spawn]= seconds*100;
Repeat
if(timer[timer_spawn]>=seconds*100)
timer[timer_spawn]-=seconds*100;
x = new_map(ball_width,ball_height,screen_depth);
map_clear(0,x,rgb(rand(0,255),rand(0,255),rand(0,255)));
ball(x);
end
frame;
Until(key(_esc))

// kill all other remaining processes and exit
let_me_alone();
exit();

End

Process ball(graph)
Private
int start_time;
Begin

// remember starting time
start_time = timer[timer_ball];

// position the ball according to the passed time (timer[timer_ball])
Loop
x = screen_width /2 + cos((timer[timer_ball]-start_time)*cos_factor)
* (screen_width /2-ball_width /2);
y = screen_height/2 + sin((timer[timer_ball]-start_time)*sin_factor)
* (screen_height/2-ball_height/2);
frame;
End

End
```

Used in example: set_fps(), new_map(), map_clear(), rand(), key(), let_me_alone(), cos(), sin(), timer, x, y

This will result in something like: Or with seconds=0.25; cos_factor=6000;sin_factor=2000 something like this: Try fiddling around with the parameters yourself and she what you can conjure.