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Tutorial:Cosine, Cosine

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(Cosine moved to Tutorial:Cosine: tutorial namespace)
 
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-[[Category:tutorials]]+#REDIRECT [[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 ==+
-<pre>+
-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+
-</pre>+
-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:<br>+
-http://wwwhome.cs.utwente.nl/~bergfi/fenix/wiki/cosine.PNG+
- +
-Or with seconds=0.25; cos_factor=6000;sin_factor=2000 something like this:<br>+
-http://wwwhome.cs.utwente.nl/~bergfi/fenix/wiki/cosine2.PNG+
- +
-Try fiddling around with the parameters yourself and she what you can conjure.+

Current revision

  1. REDIRECT Tutorial:Cosine
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