sin waves and such

sineWave1.pde

/*
sin theta-- test
 april 14, 2014
 */

float theta, vOff;
int r;
boolean dots;

void setup() {
  size(300, 300);
  reset();
  r = 20;
  dots = false;
  vOff = width/2;
  text("click to alternate",0,20);
}

void reset() {
  background(0);
  theta = 0;
}

void draw() {
  getMethod();
  theta = (theta+1)%width;
}

void getMethod() {
  if (dots) {
    drawDots(vOff);
  } 
  else {
    drawPx(vOff);
  }
}

void drawDots(float vOffset) {
  background(0);
  for (int i = 0; i < width; i+=10) {
    stroke(255);
    fill(0);
    ellipse(i, r*sin(0.05*theta+i*10)+vOffset, 10, 10);
  }
}

void drawPx(float vOffset) {
  loadPixels();
  float y = r*sin(0.05*theta)+vOffset; //vertical shift, baby! MQ6-- still got it
  int coor = (int)y*width+(int)theta;
  pixels[coor] = color(255);
  updatePixels();
}

void mousePressed() {
  dots = !dots;
  reset();
}

waves1.pde

/*
quick sine wave
*/

float theta;

void setup() {
  size(300,300);
  background(0);
  theta = 0;
}

void draw() {
  background(0);
  stroke(255);
  for (int i = 0; i < height/20; i++) {
    for (int j = 0; j < width; j++) {
      ellipse(j, 10*sin(.05*j-theta+i*(3*PI/16))+(i*25), 1,1);
    }
  }
  theta = (theta+0.5)%TWO_PI;
}