When image is loaded do something

Processing Coding Questions
1

Hi I need some help with an “if” line.
i want to know if i can so something like this:

if(image is loaded)
{
 b = true;
 } else {
 b = false;
}

if (b==true)
{
 statement
}

if (b== false)
{
 statement
}

the problem is i don’t know how to write “if a picture is loaded”

2

When you are loading your picture, just add a boolean behind the statement that goes like isLoaded = true; and then use that as variable or use the variable with you picture, lets say it is img and do something like if (img != null) {}

And please don’t move the topics back to the wrong cathegory, after someone (only people with Trust level 3 can move others topics) moved your question to the right cathegory.

3

One method is to set the image to null, then check if it is null after each loadImage operation.

PImage img = null;

img = loadImage("DoesNotExist.png");

if(img!=null){
  println("miracle image");
} else {
  println("unloaded image");
}

img = loadImage("https://processing.org/img/processing3-logo.png");

if(img!=null){
  println("expected image");
} else {
  println("website down!");
}

Output:

The file “DoesNotExist.png” is missing or inaccessible, make sure the URL is valid or that the file has been added to your sketch and is readable.

unloaded image
expected image

3 Likes