I have only just started using processing so everythings still a bit confusing, which means that i have probably made a really obvious mistake.  But anyway.

I am trying to build an "image changer" that displays a sequence of images, the position in this sequence determined by the horizontal position of the mouse.  
The images will be shown in a chronological order, so this code should allow the user to make time run back and forth by moving the mouse. (art project basically)

Here is what i have pieced together so far:

 int horizsize = 600;
 int numImage = 2;
 int imnum = (mouseX/(horizsize/numImage));
 PImage[] pic = new PImage[numImage];
 
void setup()

{
pic[0] = loadImage("0.jpg");
pic[1]= loadImage("1.jpg");

 loop();
 size(horizsize,400);
}

void draw() {
   image(pic[imnum], 0, 0);
   noCursor();
}

for the sake of simplicity, at the moment i am only using 2 images.  
It all loads alright, but the picture doesnt change when the cursor is moved around.  

What's going wrong?

Thanks

I undertand what you are saying, the picture does not update.

Is the peice of code i use loop() ?

and where should i put it in order to make processing recompute imnum?


edit:

I have got it working, buy specifying imnum inside void draw()

Thanks for your help

yeah thats what i did in the end, i left imnum without a value at the beggining, then calculated it within draw.

i have it working,  (100+ images) , but i have a question.  is a redraw() necessary at the end of the draw()?

ie


void draw() {
 imnum = (mouseX/(horizsize/numImage));
   image(pic[imnum], 0, 0);
      noCursor();
       redraw();


Thanks for all your help, i'd still be scratching my head staring at a few lines of broken code otherwise :]

aha thanks

so redraw() is only used if you do not have a constantly updating draw() window, like with noloop()

right.  i think i understand now

thanks it all makes so much more sense now