coursesites.com - genart_processing - Constellations Sketch Preface “Constellations have always been troublesome things to name. If you give one of them a fanciful name, it will always refuse to live up to it; it will always persist in not resembling the thing it has been named for. Ultimately, to satisfy the public, the fanciful name has to be …

gistfile1.pde

// Gemini
// http://stardate.org/nightsky/constellations/gemini

void setup() {
  // Sets sketch size
  size(400, 400);
  // Translates origin point (now "0, 0" are placed at "width / 5, height / 5" and not at upper left corner anymore)
  translate(width / 5, height / 5);
  // Sets background color
  background(0);
  // Disables all smoothing
  noSmooth();
  // Draws the whole Costellation
  drawCostellation();
}

/**
 * Draws a whole Costellation
 */
void drawCostellation() {
  // Starts at bottom left corner, continue clockwise
  // 1 :
  // point(150, 240);
  drawStar(150, 240, 7, 4);
  // 2 : Alhena
  // point(175, 210);
  drawStar(175, 210, 15, 5);
  // 3 :
  // point(120, 155);
  drawStar(120, 155, 5, 2);
  // 4 : Wasat
  // point(85, 130);
  drawStar(85, 130, 7, 3);
  // 5 : Pollux
  // point(50, 50);
  drawStar(50, 50, 20, 7);
  // 6 : Castor
  // point(90, 25);
  drawStar(90, 25, 15, 5);
  // 7
  // point(180, 120);
  drawStar(180, 120, 8, 3);
  // 8
  // point(225, 155);
  drawStar(225, 155, 12, 5);
  // 9
  // point(240, 160);
  drawStar(240, 160, 10, 4);
}

/* *
  * Draws a single star with its halo
  *
  * @param x star x position
  * @param y star y position
  * @param dHalo star halo diameter
  * @param dstar star diameter
  */
void drawStar(int x, int y, int dHalo, int dStar) {
  // Halo
  // Sets halo color
  stroke(235, 235, 45, 125);
  // Sets halo diameter
  strokeWeight(dHalo);
  // Draws halo
  point(x, y);

  // Star
  // Sets star color
  stroke(255, 255, 255);
  // Sets star diameter
  strokeWeight(dStar);
  // Draws star
  point(x, y);
}

// Utilities
// Needed for key use
void draw() {}

// Saves a screenshot
void keyPressed() {
  if (key == 's' || key == 'S') {
    saveFrame("screenshot_##.png");
  }
}

// Useful to find stars coordinates
void drawImage() {
  // http://stardate.org/sites/default/files/imagecache/node_display_small/images/resources/gemini.jpg

  // Loads image
  PImage img = loadImage("gemini.jpg");

  // Draws the actual image
  image(img, 0, 0);
}