how to acces value from outside if statement

Question

How to access var value from out side of if statement. I want to access brightestX value from outside of if(video.available) statement.

void draw(){
  if (video.available()) 
  {
    video.read();
    image(video, 0, 0, width, height);
    int brightestX = 0; 
    int brightestY = 0; 
    float brightestValue = 0; 

    video.loadPixels();
    int index = 0;
   
    for ( int y = 0; y < video.height; y++) {
        for ( int x = 0; x < video.width; x++) {
          int pixelValue = video.pixels[index];
          float pixelBrightness = brightness(pixelValue);

          if (pixelBrightness > brightestValue) {
              brightestValue = pixelBrightness;        
              brightestY = y;
              brightestX = x;
          }
          index++;
        }
    }
    fill(255, 204, 0, 128);
    ellipse(brightestX, brightestY, 200, 200);  
  }
}

Answer 1

Simply declare the variables you want to access outside the scope of the if condition.

You can reference the same variables later inside the if condition to update them, then after the if you can read these updated values.

Of course these values will only be updated while video data is available (otherwise remain as the most recently updated values):

void draw(){
  int brightestX = 0; 
  int brightestY = 0; 
    
  if (video.available()) 
  {
    video.read();
    image(video, 0, 0, width, height);
    float brightestValue = 0; 

    video.loadPixels();
    int index = 0;

    for ( int y = 0; y < video.height; y++) {
        for ( int x = 0; x < video.width; x++) {
          int pixelValue = video.pixels[index];
          float pixelBrightness = brightness(pixelValue);

          if (pixelBrightness > brightestValue) {
              brightestValue = pixelBrightness;        
              brightestY = y;
              brightestX = x;
          }
          index++;
        }
    }
    fill(255, 204, 0, 128);
    ellipse(brightestX, brightestY, 200, 200);  
  }
  
  println(brightestX, brightestY); 
    
}

If it helps, also check out Java Scope.