load folders of Pimages - multiple folders, unknown numbers, non-sequential filenames

digitalmartyn

hi all,

Happy new year.

Here's a problem i'm labouring over these last few days.

I want to load folders of images into an array of Pimages.

requirements: separate folders with the datapath. number of images will vary and will not be sequentially named (if possible).

so i guessed i'd need an arraylist and append the images into it.

This is how far i got. Clearly i'm muddling my arrays, strings etc.

java.io.File folder = new java.io.File(dataPath(""));

// this is the filter (returns true if file's extension is .jpg)
java.io.FilenameFilter jpgFilter = new java.io.FilenameFilter() {
  boolean accept(File dir, String name) {
    return name.toLowerCase().endsWith(".jpg");
  }
};

// list the files in the data folder
String[] filenames = folder.list(jpgFilter);

// get the number of jpg files
println(filenames.length + " jpg files in specified directory");

PImage [] imgAsset = new PImage [filenames.length];

for (int i = 0; i < filenames.length; i++) { 
  imgAsset[i] = loadImage(filenames[i]);
}

image(imgAsset[5], 0, 0); 

//the 5 in the above is to test the array. it will be a variable in the final code.

GoToLoop

https://forum.Processing.org/two/discussion/17111/how-to-display-a-random-image-using-processing#Item_3

digitalmartyn

yeah i did see that. Couldn't figure out the Pimage call.

GoToLoop

https://Processing.org/reference/loadImage_.html

digitalmartyn

thanks again @gotoloop. I enjoyed your verbose responses!

TIL - how to use strings as url.

final code:

size(1000, 1000);
ArrayList<PImage> imgAsset;


import java.io.FilenameFilter;

final FilenameFilter PIC_FILTER = new FilenameFilter() {
  final String[] exts = {
    ".png", ".jpg", ".jpeg", ".gif"
  };

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

File folder = dataFile("");
println(folder);

File[] pics = folder.listFiles(PIC_FILTER);
println("# of files found at folder above:", pics.length, ENTER);
printArray(pics);
println();

imgAsset = new ArrayList<PImage>();

String[] filenames = new String[pics.length];
for (int i = 0; i < pics.length; filenames[i] = pics[i++].getPath());

for (int i = 0; i < pics.length; i++) {
  //imgAsset.add(filenames[i], "jpg");

  //imgAsset[i] = loadImage(filenames[i], "jpg");
  PImage p = loadImage(filenames[i], "jpg");
  imgAsset.add(p);
};

image(imgAsset.get(round(random(pics.length))), 0, 0);

GoToLoop

how to use strings as url.

Well, URL are strings w/ things like http:// on it. :-\"

Although I don't get what URLs got anything to do w/ FilenameFilter and dataFile(). 8-|

digitalmartyn

ok, so how do i have separate folders of images that all add into the main arraylist? i figure i loop through the code appending each time, but it's getting very muddled.

GoToLoop

/**
 * FilenameFilter + isDirectory() (v1.0)
 * GoToLoop (2017-Jan-05)
 *
 * forum.Processing.org/two/discussion/20063/
 * load-folders-of-pimages-multiple-folders-
 * unknown-numbers-non-sequential-filenames#Item_7
 *
 * forum.Processing.org/two/discussion/17111/
 * how-to-display-a-random-image-using-processing#Item_3
 */

import java.util.List;
import java.io.FileFilter;
import java.io.FilenameFilter;

final FileFilter FOLDER_FILTER = new FileFilter() {
  @ Override boolean accept(final File path) {
    return path.isDirectory();
  }
};

final FilenameFilter PIC_FILTER = new FilenameFilter() {
  final String[] exts = {
    ".png", ".jpg", ".jpeg", ".gif"
  };

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

File dataFolder = dataFile("");
File[] imgDirs = dataFolder.listFiles(FOLDER_FILTER);
imgDirs = (File[]) append(imgDirs, dataFolder);

println(imgDirs.length, "folders found:");
printArray(imgDirs);

List<File[]> imgPaths = new ArrayList<File[]>();
for (File dir : imgDirs)  imgPaths.add(dir.listFiles(PIC_FILTER));

println("\nImage paths found for all folders:");

int totalLength = 0;
for (File[] paths : imgPaths) {
  totalLength += paths.length;
  println();
  printArray(paths);
}

println("Total images found in all subfolders:", totalLength);

PImage[] imgs = new PImage[totalLength];
int idx = 0;
for (File[] paths : imgPaths)  for (File f : paths)
  imgs[idx++] = loadImage(f.getPath());

exit();

Chrisir

/**
 * FilenameFilter + isDirectory() (v1.0)
 * GoToLoop (2017-Jan-05)
 *
 * forum.Processing.org/two/discussion/20063/
 * load-folders-of-pimages-multiple-folders-
 * unknown-numbers-non-sequential-filenames#Item_7
 *
 * forum.Processing.org/two/discussion/17111/
 * how-to-display-a-random-image-using-processing#Item_3
 */

import java.util.List;
import java.io.FileFilter;
import java.io.FilenameFilter;

final FileFilter FOLDER_FILTER = new FileFilter() {
  @ Override boolean accept(final File path) {
    return path.isDirectory();
  }
};

final FilenameFilter PIC_FILTER = new FilenameFilter() {
  final String[] exts = {
    ".png", ".jpg", ".jpeg", ".gif"
  };

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

PImage[] imgs; 

void setup() { 
  size (777, 777);

  File dataFolder = dataFile("");

  File[] imgDirs = dataFolder.listFiles(FOLDER_FILTER);
  imgDirs = (File[]) append(imgDirs, dataFolder);

  println(imgDirs.length, "folders found:");
  printArray(imgDirs);

  List<File[]> imgPaths = new ArrayList<File[]>();

  for (File dir : imgDirs) 
    imgPaths.add(dir.listFiles(PIC_FILTER));

  println("\nImage paths found for all folders:");

  int totalLength = 0;
  for (File[] paths : imgPaths) {
    totalLength += paths.length;
    println();
    printArray(paths);
  }

  println("Total images found in all subfolders:", totalLength);

  imgs = new PImage[totalLength];
  int idx = 0;
  for (File[] paths : imgPaths)
    for (File f : paths)
      imgs[idx++] = loadImage(f.getPath());

  // exit();
}

void draw() {

  int y1 = 70;
  for (PImage img1 : imgs) {
    image(img1, 30, y1);
    y1 += img1.height+33 ;
  }
}
//