how do you load and display images through a text file using 'loadStrings()'? What does the text file look like on the inside?

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joacampb

how do you load and display images through a text file using 'loadStrings()'? What does the text file look like on the inside?

in General Discussion • Other • 1 year ago

The reference is easy enough to understand if you want to read the contents of a file and not display files based off of one. I have found some good loadStrings() examples on the forum but none of them show the text files or answer my questions.

1. what does the text file look like inside if you want to load a file from your '/data'?

a. do i need specific syntax to tell processing to load the files instead of just read and print the names?

or is this right:

[top of text file]

0.jpg

1.jpg

.etc

I know how to load images and use arrays. I can make an array of images. but I dont know how to do it without loading each image individually.

any help would be great.

thank you

Replies(6)

Makio135

Re: how do you load and display images through a text file using 'loadStrings()'? What does the text file look like on the inside?

1 year ago

Yes that would be enough:

Let's say you have a "imageNames.txt" file inside data folder along with all your images called 0.jpg, 1.jpg, 2.jpg,.. and your " imageNames .txt" is like that:

0.jpg

1.jpg

2.jpg

...

Then you can use code like that:

String[] imageNames = loadStrings("imageNames.txt");
PImage[] imgs = new PImage[imageNames.length];
for(int i=0; i<imageNames.length; i++){
imgs[i]=loadImage(imageNames[i]);
}

But if your images are all named "0.jpg", "1.jpg", "2.jpg", "3.jpg", ... why don't you go directly with that:

int nbImages=15;
PImage[] imgs = new PImage[nbImages];
for(int i=0; i<nbImages; i++){
imgs[i]=loadImage(i+".jpg");
}

http://makio.free.fr/

joacampb

Re: Re: how do you load and display images through a text file using 'loadStrings()'? What does the text file look like on the inside?

1 year ago

thank you for responding. Ill work on this a little more and report.

David Wil..

Re: how do you load and display images through a text file using 'loadStrings()'? What does the text file look like on the inside?

1 year ago

You need a "for loop"

PImage[] images = new PImage[10];

for(int i = 0; i < images.length; i++) {

images[i] = loadImage(i+".jpg");

}

Would load ten images named 0.jpg, 1.jpg, 2.jpg .... 9.jpg into an image array called 'images'

if your images were called myImage0.png, myImage1.png etc you would use:

images[i] = loadImage("myImage"+i+".png");

Untested code btw.

Cheers

Dave

Calx | http://calx.co.uk

joacampb

Re: Re: how do you load and display images through a text file using 'loadStrings()'? What does the text file look like on the inside?

1 year ago

thanks for responding! Ill report in sometime soon

joacampb

Re: how do you load and display images through a text file using 'loadStrings()'? What does the text file look like on the inside?

1 year ago

thank you all. this following code works perfectly.

1. i have five test jpgs in my data folder named 00.jpg, 01.jpg...

2. those file names are saved into a .text file called list.txt

void setup(){
size(600, 600);
loadImg();//call and execute the method
}//endsetup
void draw(){
//do nothing
}//enddraw

void loadImg(){
String[] imgUrls= loadStrings("list.txt");
PImage[] images = new PImage[imgUrls.length];
     for(int i = 0; i<imgUrls.length;i++){
        images[i] = loadImage(imgUrls[i]);
        image(images[i], 110*i,0);
     }//endfor
}//endloadImg

Makio135

Re: how do you load and display images through a text file using 'loadStrings()'? What does the text file look like on the inside?

1 year ago

You should take care of the scope of variables:

if you declare images inside loadImg() :

void loadImg(){
PImage[] images = new PImage[imgUrls.length];
}

you won't be able to call your images in the draw(), you should declare images outside of functions like this:

PImage[] images;
void setup(){
size(600, 600);
loadImg();//call and execute the method
}//endsetup
void draw(){
//do nothing
}//enddraw
void loadImg(){
String[] imgUrls= loadStrings("list.txt");
images = new PImage[imgUrls.length];
     for(int i = 0; i<imgUrls.length;i++){
        images[i] = loadImage(imgUrls[i]);
        image(images[i], 110*i,0);
     }//endfor
}//endloadImg

http://makio.free.fr/

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