Load newest image in folder

bramblepelt · April 2017

I was wondering if anyone knew a way to only load the newest image in the data folder when the code starts,or IDEALY using a keyCode to switch between images in the folder. I want to be able to change which image is being displayed without having to go into the code to change the file name in " image= loadImage("file name.JPG"); ".

GoToLoop · April 2017

https://forum.Processing.org/two/discussion/2578/how-to-filter-and-order-a-set-of-files

bramblepelt · April 2017

On your post from : https://forum.processing.org/one/topic/listing-last-10-modified-files-in-directory

It is close to what I need but I would like a user input to change the image not a continuous loop and it slows down my code significantly. Its perfect but unusable for its lag time. If you could help me fix both issues that'd be awesome!

GoToLoop · April 2017

/**
 * FilenameFilter LastModified Sorting (v1.1.4)
 * GoToLoop (2017-Apr-15)
 *
 * https://forum.Processing.org/two/discussion/22004/
 * load-newest-image-in-folder#Item_3
 */

import java.util.Arrays;
import java.util.Comparator;

import java.util.Map;
import java.util.WeakHashMap;

import java.io.FilenameFilter;

static final FilenameFilter PIC_FILTER = new FilenameFilter() {
  final String[] EXTS = {
    "png", "jpg", "jpeg", "gif", "tif", "tiff", "tga"
  };

  @Override final boolean accept(final File paths, String name) {
    name = name.toLowerCase();
    for (final String ext : EXTS)  if (name.endsWith(ext))  return true;
    return false;
  }
};

static final File[] EMPTY_FILE_ARR = {};

File[] getImagePaths() {
  File[] imgPaths = dataFile("").listFiles(PIC_FILTER);
  return imgPaths != null? imgPaths : EMPTY_FILE_ARR;
}

static final int MAX_IMAGES = 5;

PImage pics[], pic;
int idx;

void setup() {
  noSmooth();
  noLoop();
  frameRate(2);

  String[] paths = new Recent().grabRecentPaths(MAX_IMAGES, getImagePaths());
  printArray(paths);

  if (paths.length == 0) {
    System.err.println("No files were requested or found in subfolder data!");
    exit();
  }

  pics = new PImage[paths.length];
  for (int i = 0; i < pics.length; pics[i] = loadImage(paths[i++]));

  pic = pics[0];
  getSurface().setSize(pic.width, pic.height);
}

void draw() {
  set(0, 0, pic);
  getSurface().setTitle("Pic: " + (idx+1) + '/' + pics.length);
}

void mousePressed() {
  keyCode = mouseButton;
  keyPressed();
}

void keyPressed() {
  final int k = keyCode;
  if (k != LEFT & k != RIGHT)  return;

  final int sig = k == RIGHT? 1 : -1;
  idx = (pics.length + idx + sig) % pics.length;

  pic = pics[idx];
  getSurface().setSize(pic.width, pic.height);

  clear();
  redraw();
}

static class Recent {
  final Map<File, Long> filecache = new WeakHashMap<File, Long>(0100);

  final Comparator<File> recentComparator = new Comparator<File>() {
    @Override final int compare(final File f1, final File f2) {
      return Long.signum(filecache.get(f2) - filecache.get(f1));
    }
  };

  static final String[] EMPTY_STR_ARR = {};
  String[] filenames = EMPTY_STR_ARR;

  @SafeVarargs final String[] grabRecentPaths(int qty, final File... paths) {
    if (qty == 0 || paths == null || paths.length == 0)
      return filenames = EMPTY_STR_ARR;

    if (qty < 0)  qty = paths.length;
    qty = min(qty, paths.length);
    filenames = new String[qty];

    if (paths.length == 1)  filenames[0] = paths[0].getPath();
    else {
      for (final File f : paths)  filecache.put(f, f.lastModified());
      Arrays.sort(paths, recentComparator);
      for (int i = 0; i < qty; filenames[i] = paths[i++].getPath());
    }

    return filenames;
  }

  @Override String toString() {
    return join(filenames, ENTER);
  }
}

GoToLoop · April 2017

/**
 * FilenameFilter LastModified Sorting (v2.0)
 * GoToLoop (2017-Apr-15)
 *
 * https://forum.Processing.org/two/discussion/22004/
 * load-newest-image-in-folder#Item_4
 */

import java.util.Arrays;
import java.util.Comparator;
import java.util.function.Supplier;

import java.util.Map;
import java.util.WeakHashMap;

import java.io.FilenameFilter;

static final FilenameFilter PIC_FILTER = new FilenameFilter() {
  final String[] EXTS = {
    "png", "jpg", "jpeg", "gif", "tif", "tiff", "tga"
  };

  @Override final boolean accept(final File paths, String name) {
    name = name.toLowerCase();
    for (final String ext : EXTS)  if (name.endsWith(ext))  return true;
    return false;
  }
};

static final File[] EMPTY_FILE_ARR = {};

File[] getImagePaths() {
  File[] imgPaths = dataFile("").listFiles(PIC_FILTER);
  return imgPaths != null? imgPaths : EMPTY_FILE_ARR;
}

static final int MAX_IMAGES = 5;

PImage pics[], pic;
int idx;

void setup() {
  noSmooth();
  noLoop();
  frameRate(2);

  final String[] paths = Recent.grabRecentPaths(MAX_IMAGES, getImagePaths());
  printArray(paths);

  if (paths.length == 0) {
    System.err.println("No files were requested or found in subfolder data!");
    exit();
  }

  pics = new PImage[paths.length];
  for (int i = 0; i < pics.length; pics[i] = loadImage(paths[i++]));

  pic = pics[0];
  getSurface().setSize(pic.width, pic.height);
}

void draw() {
  set(0, 0, pic);
  getSurface().setTitle("Pic: " + (idx+1) + '/' + pics.length);
}

void mousePressed() {
  keyCode = mouseButton;
  keyPressed();
}

void keyPressed() {
  final int k = keyCode;
  if (k != LEFT & k != RIGHT)  return;

  final int sig = k == RIGHT? 1 : -1;
  idx = (pics.length + idx + sig) % pics.length;

  pic = pics[idx];
  getSurface().setSize(pic.width, pic.height);

  clear();
  redraw();
}

static final class Recent {
  static final ThreadLocal<Map<File, Long>> filecache = ThreadLocal.withInitial(
    new Supplier<Map<File, Long>>() {
    @Override final Map<File, Long> get() {
      return new WeakHashMap<File, Long>(0150);
    }
  }
  );

  static final Comparator<File> RECENT_CMP = new Comparator<File>() {
    @Override final int compare(final File f1, final File f2) {
      final Map<File, Long> fc = filecache.get();
      return Long.signum(fc.get(f2) - fc.get(f1));
    }
  };

  static final String[] EMPTY_STR_ARR = {};

  @SafeVarargs static String[] grabRecentPaths(int qty, final File... paths) {
    if (qty == 0 || paths == null || paths.length == 0)  return EMPTY_STR_ARR;

    if (qty < 0)  qty = paths.length;
    qty = min(qty, paths.length);

    final String[] filenames = new String[qty];

    if (paths.length == 1)  filenames[0] = paths[0].getPath();
    else {
      final Map<File, Long> fc = filecache.get();
      for (final File f : paths)  fc.put(f, f.lastModified());

      Arrays.sort(paths, RECENT_CMP);
      for (int i = 0; i < qty; filenames[i] = paths[i++].getPath());
    }

    return filenames;
  }
}

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