Random image from URL

sctv

in Contributed Library Questions • 1 year ago

Hello.

I'm writing some code to pull images from a url and then randomly display one when mousePressed. So far I've got:

PImage fragment;
int rand;
void setup() {
size(800, 600);
rand = int(random(0, 9));
randomimage("http://samuelcox.net/random/frag_" + nf(rand, 3) + ".jpg");
}
// RANDOM LOAD FUNCTION
void randomimage(String fn) {
fragment = loadImage(fn); //LOAD RANDOM IMAGE
}
void draw()
{
image(fragment, 0, 0);
if (mousePressed) {
image(fragment, 0, 0);
}
}

This loads one image, but when mousePressed doesn't pull another one. I'm guessing thats because the randomimage is in void setup? Any help to do this would be appreciated!

Replies(3)

PhiLho

In general, we advise not to load images from draw(). Well, that's one exception, and that's OK when it is under control (ie. not loaded on each frame!).
Here, the simplest way is to use mousePressed() instead of the variable (so you are sure to see the event, not the state which can persist over several frames), and there just call randomImage(). But I would make it parameterless and add the random URL in the function itself.

kooogy

Re: Random image from URL

1 year ago

your conditional bit only reshows the current image, it needs to call randomImage() to load a new one (which will then be shown on the next draw().

(you probably want to load the new image in a mousePressed() method and into another PImage and then swap them when it's loaded - loading it in draw() will slow things down, possibly breaking them)

((edit. what PhiLho said))

PhiLho

Re: Re: Random image from URL

1 year ago

Two different voices are better than one!

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