drawing to a buffer

zappfinger

I am trying to draw a simple wave plot, to be sent to Csound over OSC. The problem is, I would like to save the y value to an array as I'm drawing. Something like:

void mouseDragged(){
  stroke(25,25);
    int x = mouseX;
    if (x<512 && x>=0) {      
      int y = mouseY;
      line(x, y, pmouseX, pmouseY);
      outbuf[x] = y;
    }
}

But this leaves gaps in the buffer, unless I draw really slow. How to get around this?

Richard

REAS

I think it should work. I would try doing it in draw() inside this conditional:

if (mousePressed) {

zappfinger

Yes, tried it in draw() too, but the same thing. I understood I was better of using mouseDragged() or mouseMoved().. When I show the output buffer ( at the frame rate or slower), it has these gaps.

GoToLoop

// forum.processing.org/one/topic/saving-mouseevent-data-in-an-array
// forum.processing.org/two/discussion/160/exporting-data

import java.util.List;

final static List<PVector> coords = new ArrayList();

final static color BG = -1, FG = 0300, BORDER = 0;
final static short DIM = 20, BOLD = 2, FPS = 100;

void setup() {
  size(640, 480);
  smooth();
  noLoop();
  frameRate(FPS);

  fill(FG);
  stroke(BORDER);
  strokeWeight(BOLD);
  background(BG);
}

void draw() {
  print(coords.size() + " - ");
}

void mouseDragged() {
  redraw();
  coords.add( new PVector(mouseX, mouseY) );
  ellipse(mouseX, mouseY, DIM, DIM);
}

void keyTyped() {
  if (key != ' ' & key != RETURN & key != ENTER)  return;

  final String archive = dataPath("MouseCoords.txt");

  final int num = coords.size();
  final String[] coordsTxt = new String[num];

  for (int i = 0; i != num; ++i) {
    //final PVector coord = coords.get(i);
    //coordsTxt[i] = coord.x + "," + coord.y;

    final int[] coord = int( coords.get(i).array() );
    coordsTxt[i] = coord[0] + "," + coord[1];
  }

  saveStrings(archive, coordsTxt);
  println("\n\nMOUSE COORDS SAVED!\n");
}

zappfinger

Interesting approach, GotoLoop, but for a wave file I need every x coordinate to be filled. This method also skips x coordinates (leaves gaps) when I move the mouse faster...

Richard

GoToLoop

Dunno! Mebe you should create a method to analyze each collected coordinate, and then fill in the gaps between 1 to the other.
Then save it to another structure.

zappfinger

Yes, I was thinking about that too.