Need help with a 2D array.

Programming Questions

vincent.p..

in Programming Questions • 1 year ago

I have this code. It generates a random 2D Greyscale Image. Works fine.

size(1920,1080);
int cols = width;
int rows = height;

int[][] myArray = new int[cols][rows];

for (int i = 0; i < cols; i++) {
for (int j = 0; j < rows; j++) {
myArray[i][j] = int(random(255));
}
}

for (int i = 0; i < cols; i++) {
for (int j = 0; j < rows; j++) {
stroke(myArray[i][j]);
point(i,j);
}
}

Now the thing i couldnt get my head around for a very long time is how i can make it:
Compute and Show Image for X seconds then, Compute and Show (an other) Image for X seconds (loop).
After start or key pressed.
In Fullscreen.

Help would be very very much appreciated. I just cant do it.

Cheers

Replies(2)

tfguy44

Re: Need help with a 2D array.

1 year ago

For demonstration purposes, I reduced the size of your sketch. You can re-adjust it if you need to. I assumes "X seconds" was actually "5 seconds"; you can adjust this value (defined as 5000 milliseconds) on line 20.

Copy code

PImage myImage;
int nextTime;
void setup(){
size(200,200);//1920,1080);
myImage = new PImage( width, height );
newImage();
}
void draw(){
if( millis() > nextTime ){
newImage();
}
}
void newImage(){
for (int i = 0; i < width; i++) {
for (int j = 0; j < height; j++) {
stroke(color(random(255)));
point(i,j);
}
}
nextTime = millis() + 5000;
}
void keyPressed(){
newImage();
}

vincent.p..

Re: Need help with a 2D array.

1 year ago

thank you so much tfguy44
didnt know how to connect a draw() with the array =)

managed to fix the fullscreen part with a library upgrade:

import fullscreen.*;

    FullScreen fs;

    PImage myImage;
    int nextTime;
    void setup(){
      size(1920,1080);//1920,1080);
      myImage = new PImage( width, height );
      newImage();
      fs = new FullScreen(this);
      fs.enter();
    }
    void draw(){
      if( millis() > nextTime ){
        newImage();
      }
    }
    void newImage(){
      for (int i = 0; i < width; i++) {
        for (int j = 0; j < height; j++) {
          stroke(color(random(255)));
          point(i,j);
        }
      }
      nextTime = millis() + 1000;
    }
    void keyPressed(){
      newImage();
    }

Top Reply