hi
i am a beginner and i'm trying to write an interactive program to create a simple scrolling wave (as a line). i have been looking at the 'NoiseWave' program by Daniel Shiffman in the examples (see code below), but i can't figure out how to replace the ellipses with a single smooth line.
it seems to be more complex than i thought it would be.

any suggestions?

d


int xspacing = 8;   // How far apart should each horizontal location be spaced
int w;              // Width of entire wave

float yoff = 0.0f;        // 2nd dimension of perlin noise
float[] yvalues;          // Using an array to store height values for the wave (not entirely necessary)

void setup() {
 size(200,200);
 frameRate(30);
 colorMode(RGB,255,255,255,100);
 smooth();
 w = width+16;
 yvalues = new float[w/xspacing];
}

void draw() {
 background(0);
 calcWave();
 renderWave();

}

void calcWave() {
 float dx = 0.05f;
 float dy = 0.01f;
 float amplitude = 100.0f;

 // Increment y ('time')
 yoff += dy;

 //float xoff = 0.0;  // Option #1
 float xoff = yoff; // Option #2

 for (int i = 0; i < yvalues.length; i++) {
   // Using 2D noise function
   //yvalues[i] = (2*noise(xoff,yoff)-1)*amplitude; // Option #1
   // Using 1D noise function
   yvalues[i] = (2*noise(xoff)-1)*amplitude;    // Option #2
   xoff+=dx;
 }

}

void renderWave() {
 // A simple way to draw the wave with an ellipse at each location
 for (int x = 0; x < yvalues.length; x++) {
   noStroke();
   fill(255,50);
   ellipseMode(CENTER);
   ellipse(x*xspacing,width/2+yvalues[x],16,16);
 }
}

thanks mr Shiffman, but i must be a real plebeian because i can't get it to work.
when i dropped in the code you suggested it didn't recognise the [i]. so i changed i to x and it created thin vertical strokes from the wave points instead of connecting them into a smooth line running on the horizontal axis.

here's the way i put it in:

void renderWave() {  
 for (int x = 0; x < yvalues.length-1; x++) {
   stroke(255);
   line(x*xspacing,width/2+yvalues[x],x*xspacing,width/2+yvalues[x+1]);
 }
}

i've tried as many variations on this as i can think of, but no joy so far.
any further hints?

d

thanks... it's working!