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Index › Programming Questions & Help › Programs › Problem with rotating a sinewave
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Problem with rotating a sinewave (Read 1045 times)
usl
Problem with rotating a sinewave
Sep 18th, 2007, 6:04pm  
Hi there!
I'm trying to rotate a sinewave. My goal is to have it follow an arbitrary function. I do not want to modulate (add) it onto this function instead it's more that the sinewaves x-axis should be formed according to the function (getting the rotation angle should be easy using the derivative of the function). My problem is the rotation. The example program plots a sinewave rotated by 90° wich works just fine, aswell as a sinewave which is gradually rotated to form a curve. The latter one gets distorted and doesn't really end up as I expect it to. Calculating the rotation matrix by hand (instead of rotate()) ends up pretty much the same way. Am I missing anything of the math?
Thanks in advance and best regards, usl.

Quote:


void setup(){
 size(256,256);
 noLoop();
 background(255);
}

void draw(){
 translate(50, 0);
 rotate(radians(90));
 for(int x=0; x<360; x++) {
   float val1 = sin(x)*10;
   float val2 = sin(x+1)*10;
   
   line(x*2, val1, x*2, val2);
 }
 
 for(int x=0; x<360; x++) {
   float val1 = sin(x)*10;
   float val2 = sin(x+1)*10;
   
   line(x*2, val1, x*2, val2);
   
   rotate(radians(-1));
 }
}
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V
Re: Problem with rotating a sinewave
Reply #1 - Sep 18th, 2007, 6:49pm  
sin() works with radians aswell.. not sure what your problem is.. what is the result your trying to achieve ?
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Victor Martins | www.pixelnerve.com/v
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