processingで音に反応して図形を描画してみる

音の大きさによって図形を描画してみる

minimのインポート

import ddf.minim.*;
Minim minim;

初期値のセットと図形描画部分

AudioInput in;
float volumeIn;
float d = 0;
float sa;
float easing = 0.1;
float center_x = 0;
float center_y = 0;

float color_r = 50;
float color_g = random(255);
float color_b = 255;

void setup() {
  fullScreen();
  minim = new Minim(this);
  in = minim.getLineIn(Minim.MONO, 512);

  center_x = random(width);
  center_y = random(height);
}

float[] ds = new float[1024];
float[] cxs = new float[1024];
float[] cys = new float[1024];
float[] rs = new float[1024];
float[] gs = new float[1024];
float[] bs = new float[1024];
int ds_length = 0;

float dd = 0;
float pre_d = 0;
float pre_dd = 0;

boolean isChangable = false;
int defaultLeapCount = 50;
int leapCount = defaultLeapCount;

void draw() {
  background(#000000);
  volumeIn = map(in.left.level(), 0, 0.05, 0, width);
  sa = volumeIn - d;
  if(abs(sa) > 0.5){
    d = d + sa * easing; 
  }

  dd = d - pre_d;

  if (dd * pre_dd < 0) {
    ds[ds_length] = d;
    cxs[ds_length] = center_x;
    cys[ds_length] = center_y;
    rs[ds_length] = color_r;
    gs[ds_length] = color_g;
    bs[ds_length] = color_b;
    ds_length += 1;
  }

  pre_d = d;
  pre_dd = dd;

  for(int i = 0; i < ds_length; i++) {
    noFill();
    stroke(rs[i], gs[i], bs[i]);
    strokeWeight(5);
    ellipse(cxs[i], cys[i], ds[i], ds[i]);
  }

  noFill();
  stroke(color_r, color_g, color_b);
  strokeWeight(5);
  ellipse(center_x, center_y, d, d);

  if (d < 200) {
    leapCount--;
    if (isChangable || leapCount < 0) {
      center_x = random(width);
      center_y = random(height);
      color_r = 25;
      color_g = random(255);
      color_b = 255;
      isChangable = false;
      leapCount = defaultLeapCount;
    }
  } else {
    isChangable = true;
  }
}

下記リンクにソースがあるのでよければ何かのベースに使ってください

File DL: [github](https://github.com/shgakdhd/sound-visualizer)