Winamp & SHOUTcast Forums > AVS Sin, Cos, Tan

 8th October 2001, 00:30 #1 n_ick2000 Forum King     Join Date: May 2001 Location: - Posts: 2,501 Sin, Cos, Tan I learned in my geometry class that sine, cosine, and tangent were triangle angle ratios. Exactly how do sin, cos, and tan effect superscopes and movements. I heard something about triangle angle ratios being in degress and superscopes and movements being in rads, but I don't know what that means. Can somebody please explain this to me? |
 8th October 2001, 16:30 #2 Scarface2k1 Banned     Join Date: Feb 2001 Location: i dont get out much so i dont remember Posts: 1,032 well, i find that this will do fine for movement: `code:y=cos(t+i);`
 9th October 2001, 23:38 #3 UnConeD Whacked Moderator     Join Date: Jun 2001 Posts: 2,104 Trigonometry :) The easiest way to explain is this: Given a circle with radius 1 (the so called 'unit-circle'). We take a random point on this circle. We can describe this point uniquely by the angle of the radius through this point and the X-axis, for example 90°, 140°, ... Mathematically however, radians are used instead of degrees. Without going into much theory, you should just remember that 360° = 2*PI. So suppose we have a point lying at N radians on our unit circle. Then the X coordinate will be given by cos(N), and the Y coordinate by sin(N). That's the definition of cosine and sine. So if you want to draw a circle, take every value A from 0 to 2*PI, and plot the points (cos(A), sin(A)). Easy. The relationship of sine and cosing with right-angled triangles is pretty easy to see. Draw a circle using the origin (0,0) as center. Take a point on this circle, connect the point with the center, project the point on the X axis. Voilà: a right-angled triangle appears Sin and cos have other uses as well. Because they are coordinates of points lying on a circle, they are periodic. A point traveling along a circle will eventually arrive at its starting point. This means that their values are repetive after a while (2*PI to be exact). So you can use sine and cosine as a source for a pulsing/wavy scope or movement. The tangent tan is defined as sin divided by cos. It ranges from negative infinity to positive infinity in -PI/2 to PI/2, and repeates itself every PI. Usually you won't need the actual mathematical uses of these functions, but you'll rather be using their characteristics (e.g. repetiveness).
 10th October 2001, 01:57 #4 n_ick2000 Forum King     Join Date: May 2001 Location: - Posts: 2,501 Thanks uncloned. That makes more sence to me. |
 12th October 2001, 20:21 #5 UnConeD Whacked Moderator     Join Date: Jun 2001 Posts: 2,104 Nick :) While I'm pretty sure I have not been cloned, I'd appreciate it if you'd stick to my actual nickname
 13th October 2001, 03:56 #6 n_ick2000 Forum King     Join Date: May 2001 Location: - Posts: 2,501 sorry, finger sliped |
 28th October 2001, 05:34 #7 buffer_brazil Junior Member   Join Date: Oct 2001 Location: Brazil Posts: 8 I Want to Learn About Sin, Cos I Want to Make Cool Equations on My AVS Editor but i Don´t Know very few About Sin, Cos, Tan ... Where can I Get Documentation about it?? If You Have Documentation about it, please send me!
 16th November 2001, 22:11 #8 Angry Weasel Senior Member   Join Date: Oct 2001 Posts: 145 There's also arcsine(asin), arccosine(acos) and arctangent(atan). I find that d=atan(d) has a nice effect as demonstrated in Justin's age-old plugin that's no longer available, Gold Shower in Pseudo 3D.
 17th November 2001, 02:04 #9 n_ick2000 Forum King     Join Date: May 2001 Location: - Posts: 2,501 Justin didn't make it. Lone did. It was in an older version of winamp. Justin removed a blur and added biliner filtering because bilinear filtering wasn't there when lone made it. |
 17th November 2001, 14:06 #10 Angry Weasel Senior Member   Join Date: Oct 2001 Posts: 145 Sorry...Lone made it but it was sweet.
 22nd December 2002, 22:56 #11 Kagnar Member     Join Date: Nov 2002 Location: Everywhere Posts: 58 This is off the subject, but I noticed something. If you highlight (click and drag) over a smiley face emoticon, it turns to a sad face! Well, sort of.
 23rd December 2002, 01:59 #12 UnConeD Whacked Moderator     Join Date: Jun 2001 Posts: 2,104 Only in browsers that don't support true alphablending (*cough*IE*cough*)
 23rd December 2002, 02:52 #13 Kagnar Member     Join Date: Nov 2002 Location: Everywhere Posts: 58 What does that mean?
 23rd December 2002, 02:53 #14 Kagnar Member     Join Date: Nov 2002 Location: Everywhere Posts: 58 Oh wait, I got it.
 23rd December 2002, 22:37 #15 dirkdeftly Forum King     Join Date: Jun 2001 Location: Cydonia, Mars Posts: 2,651 1: Use the edit button 2: Don't revive dead posts for no reason "guilt is the cause of more disauders than history's most obscene marorders" --E. E. Cummings
 24th December 2002, 22:09 #16 WHCode RED Registered User     Join Date: Sep 2002 Location: My Computer! Posts: 257874 Posts: 69 ack! What! This post is a zombie! AAhhhh! (sorry, couldn't help it)
 Winamp & SHOUTcast Forums > AVS Sin, Cos, Tan