float x, y, maxAmp;
float [] amps = new float [16];
float [] freqs = new float [16];
int gX1=40, gX2, gX3, gY1=20, gY2=40, gY3, gY4, gY5, gY6, cX1, cX2, cY1, mX, mY;
PFont fontA;

void setup(){
  size (520, 350);
  gX2=width-gX1;
  gX3=gX2/16;
  gY3=height-gY1-gY2;
  gY4=gY1+(gY3/2);
  gY6=gY3/10;
  cX1=gX1-(gX3/2);
  cX2=width-(gX3/2);
  cY1=height-gY2;
  maxAmp = (gY4-gY1)/8;
  loop();
  for(int i=0; i<16; i++){
    freqs[i]=(i+1)*(TWO_PI/gX2);
  }
  fontA = loadFont ("ArialHebrew-12.vlw");
  grid();
  smooth();
  fill(255, 64);
  noLoop();

}
void draw(){
  //ampsFill();
  //ampTotal();
  background (255);
  grid();
  wave();
  bars();
}
void mousePressed() {
  loop();
  ampsFill();
}
void mouseDragged() {
  loop();
  ampsFill();
}
void mouseReleased() {
  noLoop();
}
void keyPressed(){
  if(key == '1'){ //sawtooth
    for(int i=0; i<16; i++){
      amps[i]=1.0/(i+1);
    }
  }
  if(key == '2'){ //square
    for(int i=0; i<16; i++){
      amps[i]=1.0/(i+1);
      amps[1+(i/2)*2]=0;
      //println(amps[i]);
    }
  }
  loop();
}
void keyReleased(){
  noLoop();
}
void ampsFill(){
  mX=(constrain(mouseX, cX1, cX2)-35)/gX3;
  mX=constrain(mX, 0, 15);
  mY=gY3-(constrain(mouseY, gY1, cY1)-40);
  amps[mX]=map(mY, gY1, cY1, 0.0, 1.0);
}
/*void ampTotal(){
 float tAmp =0;
 for(int i=0; i<16; i++){
 tAmp=tAmp+amps[i];
 } 
 maxAmp = (gY4-gY1)/tAmp;
 }*/
void grid(){
  int cent=0, part1=0, part2=0; 
  float part3=0;
  for(int i=0; i<11; i++){
    strokeWeight(1);
    stroke(0, 20);
    gY5 = (i*gY6)+gY1;
    line(gX1, gY5, width, gY5);
    fill(100);
    cent=100-(i*10);
    cent=char(cent);
    textFont(fontA, 12);
    text(cent, 16, gY5+3);
  }
  strokeWeight(1);
  stroke(0, 20);
  for(int j=0; j<16; j++){
    part1=(j*gX3)+gX1;
    line(part1, gY1, part1, cY1);
    part2=j+1;
    part2=char(part2);
    text(part2, gX1+(j*gX3)-2, 16);
    part3=100*amps[j];
    text(nf(part3, 2, 1), gX1+(j*gX3)-6, cY1+16);
  }
}
void wave(){
  float x2=gX1, y2=gY4;
  stroke(0, 255, 0);
  strokeWeight(3);
  for(int i=0; i<gX2; i++){
    y=0;
    for(int j=0; j<16; j++){
      y=y+(maxAmp*amps[j])*sin(i*freqs[j]);
    }
    x = i+gX1;
    line(x, y+gY4, x2, y2);
    x2=x;
    y2=y+gY4;
  }
}
void bars(){
  noStroke();
  fill(0, 60);
  for(int k=0; k<16; k++){
    rect(gX1+(k*gX3), gY1+gY3-(amps[k]*gY3), 4, amps[k]*gY3);
  }
}