// Author Rupert Russell
// Date September 4, 2010
// Purpose to draw a scintillating grid illusion
// Writen in Processing see http://processing.org/

// Schtauf, M., Lingelbach, B., Wrist, E.R. (1997)
// The scintillating grid illusion. Vision Research,
// 37, 1033-1038.

void setup() {
  size(1024, 760);

  background(0);      // black background
  strokeWeight(3);    // medium weight lines
  smooth();           // antialias lines
}

float x = 0;
float y = 0;
float xx = 0;
float yy = 0;
int step = 19;      // grid spacing

void draw() {

 //vertical lines
 stroke(100, 100, 100); // dark grey colour
 x = x + step;
 line(x, 0, x, height);


 //horizontal lines
 stroke(100, 100, 100); // dark grey colour
 y = y + step;
 line(0, y, width, y);

 // Circles
 smooth();
 ellipseMode(CENTER);

 stroke(256, 256, 256); // white circles

 for (int i = step; i < width -5; i = i + step) {
  for (int j = step; j < height -15; j = j + step) {
  strokeWeight(4);
  point(i, j);
  strokeWeight(3);
 }
}

}
// Save tif when mouse is clicked
void mouseClicked(){
noLoop();
save("scintillating1024.tif");
}

APA citation:
Russell, R. (2016, July 04, 03:21 pm). Scintillating grid illusion.
     Retrieved November 24, 2024, from
     http://www.rupert.id.au/processing/scintillating_grid.php

Last refreshed: November 24 2024. 06:32.18 pm

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