Trying to change the height/width of this object

nlogax

Trying to change the height/width of this object

in Contributed Library Questions • 1 year ago

Hello,

I am very new to processing and hardly know any programming language. Im trying to edit some of the parameters of this sketchbook example from the beads library. If anyone can help me out, that would be great.

I have this line of code here:

* Just do the work straight into Processing's draw() method.
*/
void draw() {
loadPixels();
//set the background
Arrays.fill(pixels, back);
//scan across the pixels
for(int i = 1; i < width; i++) {
//for each pixel work out where in the current audio buffer we are
int buffIndex = i * ac.getBufferSize() / width;
//then work out the pixel height of the audio data at that point
int vOffset = (int)((1 + ac.out.getValue(0, buffIndex)) * height / 2);
//draw into Processing's convenient 1-D array of pixels
pixels[vOffset * height + i] = fore;
}
updatePixels();
}

I'm trying to change the width of the object that is interacting with the audio file.

Replies(4)

hellochar

Re: Trying to change the height/width of this object

1 year ago

It's a good idea to include the error you're getting. Is that the entirety of the code, or are there other methods and variables?

nlogax

Re: Trying to change the height/width of this object

1 year ago

here is the entirety of the code. it is a sketchbook example:

import beads.*;

AudioContext ac;
PowerSpectrum ps;

void setup() {
size(800,800);
ac = new AudioContext();
/*
   * Here's something we've seen before...
   */
String audioFile = selectInput();
SampleManager.setBufferingRegime(Sample.Regime.newStreamingRegime(1000));
SamplePlayer player = new SamplePlayer(ac, SampleManager.sample(audioFile));
Gain g = new Gain(ac, 2, 0.2);
g.addInput(player);
ac.out.addInput(g);
/*
   * To analyse a signal, build an analysis chain.
   */
ShortFrameSegmenter sfs = new ShortFrameSegmenter(ac);
sfs.addInput(ac.out);
FFT fft = new FFT();
ps = new PowerSpectrum();
sfs.addListener(fft);
fft.addListener(ps);
ac.out.addDependent(sfs);
//and begin
ac.start();
}

/*
* Here's the code to draw a scatterplot waveform.
* The code draws the current buffer of audio across the
* width of the window. To find out what a buffer of audio
* is, read on.
*
* Start with some spunky colors.
*/
color fore = color(1, 1, 1);
color back = color(0,0,300);

void draw()
{
background(back);
stroke(fore);

float[] features = ps.getFeatures();
if(features != null) {
    //scan across the pixels
    for(int i =0; i < width; i++) {
      int featureIndex = i - features.length / width;
      int vOffset = height * 1 * Math.min((int)(features[featureIndex] * height), height - 10);
      line(i,height,i,vOffset);
      int v0ffset = height - 5 - Math.min((int)(features[featureIndex] * height), height - 10);
    }
}

hellochar

Re: Re: Trying to change the height/width of this object

1 year ago

Ok. And what's the error you're getting?

nlogax

Re: Trying to change the height/width of this object

1 year ago

Incompetence I guess? There's no error, I just want to adjust some of the parameters of the code and I am not sure how to go about doing it. I want to adjust the visuals it displays that correspond with the audio. I believe the draw() function does this but I lack the required programming knowledge.

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