Image loading slowing down program

Programming Questions

john.vavr..

Image loading slowing down program

in Programming Questions • 8 months ago

I was messing around with background images, and for some reason if i don't load the image immediately before i want to use it, a null pointer comes up.

right now this is what i have, and it seems to be resource heavy due to constant image loading

PImage BACK;
public void setup()
{
size(600,600,P2D);
}
public void draw()
{
background((loadImage("microbial.jpg").get(mouseX,mouseY,600,600)));
}

I would expect this to work and it doesn't

PImage img;
img = loadImage("microbial.jpg");
public void setup()
{
size(600,600,P2D);
}
public void draw()
{
background((img.get(mouseX,mouseY,600,600)));
}

Replies(2)

GoToLoop

Re: Image loading slowing down program

8 months ago

1st example:

That method is just terrible! You keep loading the same pic 60 times each second!

2st example:

Many Processing things are only known once execution enters setup().

It means that before it, Processing doesn't know where folder "/data/" is, and can't load anything!

Another important attribute which is unknown until setup() are variables width & height.
There are some others as well.

Solution:

Declare PImage variable(s) before setup(), but initialize them within it!

john.vavr..

Re: Re: Image loading slowing down program

8 months ago

Thank you, that thoroughly explained everything.

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