根据声音改变亮度(处理中) [英] Changing brightness depending on sound (Processing)

问题描述

我现在正在学习处理，我正在尝试制作一个草图，当声音改变时，它可能会改变颜色.

I am learning processing right now and I am trying to make a sketch that could change colour when the sound changes.

(当振幅+时，然后亮度+)

(When Amplitude + , Then Brightness+ )

因为更改颜色不需要像draw()函数一样快地进行更改.那么，我该如何构建一个时钟，以使颜色不会在每次绘制时都发生变化?

Because changing colour does not need to change as rapid as the draw() function. So how could I build a clock so that the color would not change in every draw?

这是我现在正在使用的代码:

This is the code I am using right now:

import ddf.minim.*;
import ddf.minim.signals.*;
import ddf.minim.analysis.*;
import ddf.minim.effects.*;

Minim minim;
AudioPlayer song;
FFT fft; 
BeatDetect beat;

color start=color(0,0,0);
color finish;
float amt = 0.0;

void setup()
{
  frameRate(50);
  size(600,600,P3D);    
  minim = new Minim(this);
  song = minim.loadFile("song2.mp3", 512);
  song.loop();

  fft = new FFT(song.bufferSize(), song.sampleRate());

   beat = new BeatDetect(song.bufferSize(), song.sampleRate());

}

// draw is run many times
void draw()
{  
  float brightness = map( 0, 0, song.bufferSize(), 0, 255 ); 
  background( brightness );
  // println(song.bufferSize());

  stroke(100);

  // draw the waveforms
  for( int i = 0; i < song.bufferSize() - 1; i++ )
  {
    // find the x position of each buffer value
    float x1  =  map( i, 0, song.bufferSize(), 0, width );
    float x2  =  map( i+1, 0, song.bufferSize(), 0, width );
    // draw a line from one buffer position to the next for both channels
    line( x1, 50 + song.left.get(i)*50, x2, 50 + song.left.get(i+1)*50);
    line( x1, 150 + song.right.get(i)*50, x2, 150 + song.right.get(i+1)*50);
  println(x1);
  }

}

---

推荐答案

在frameRate中信任以控制定时是可以的，但是当然取决于frameRate.这意味着，如果您的frameRate下降，则timimg也将下降.

Trusting in frameRate to control timing is ok, but is, of course, frameRate dependent. Meaning that if your frameRate drops the timimg will drop together.

为避免这种情况，您可以使用 millis()并将计时附加到时间上:)

To avoid that, you may use millis() and attach your timing to, well time :)

这是一个非常简单的计时器示例:

Here a very simple timer example:

PFont font;
String time = "000";
int initialTime;
int interval = 1000;//one second
color bg = color (255);


void setup()
{
  size(300, 300);
  font = createFont("Arial", 30);
  background(255);
  fill(0);
  initialTime = millis();
  frameRate(30);// changed framerate to exemplify
}

void draw()
{
  background(bg);
  if (millis() - initialTime > interval)
  {
    time = nf(int(millis()/1000), 3);
    initialTime = millis();
   bg = color (random(255), random(100), random(255));
  }

  text(time, width/2, height/2);


}

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