Distance 2D.

Move the mouse across the image to obscure and reveal the matrix. Measures the distance from the mouse to each square and sets the size proportionally.

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float max_distance;

void setup() {
  size(640, 360); 
  noStroke();
  max_distance = dist(0, 0, width, height);
}

void draw() {
  background(0);

  for(int i = 0; i <= width; i += 20) {
    for(int j = 0; j <= height; j += 20) {
      float size = dist(mouseX, mouseY, i, j);
      size = size/max_distance * 66;
      ellipse(i, j, size, size);
    }
  }
}

Functions Used

size()

Defines the dimension of the display window width and height in units of pixels

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ellipse()

Draws an ellipse (oval) to the screen

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setup()

The setup() function is run once, when the program starts

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draw()

Called directly after setup(), the draw() function continuously executes the lines of code contained inside its block until the program is stopped or noLoop() is called

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for

Controls a sequence of repetitions

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noStroke()

Disables drawing the stroke (outline)

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background()

The background() function sets the color used for the background of the Processing window

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dist()

Calculates the distance between two points

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