Random Dots

//variables

​

//initialize

void setup() {

  size(400,400);

  background(0);

  // how or why does color mode and rgb setting affect dot drawing?

  colorMode(RGB,255,255,255,100);

  //draw nice anti-aliased things.

  smooth();

}

​

//draw a circle of a random size

void randomEllipse() {

  // for right now, we use center mode. It may be better to use corner mode.

  ellipseMode(CENTER);

  float wh = random(3, 25);

  int whvalue = int(wh);

  // get random x axis point; need to figure out how to test bounds outside or touching window

  float x = random(0, 401);

  int xx = int(x);

  // get random y axis point; need to figure out how to test bounds outside or touching window

  float y = random(0, 401);

  int yy= int(y);

  ellipse(xx, yy, whvalue, whvalue);

}

​

// fill an area with various greens

void fillArea() {

  // show floating point to integer conversion for now. could be written as one statement

  // vary opacity between 10% and 100%

  float x = random(10, 101);

  int opaqvalue = int(x);

  // vary green between 75 and 255

  float y = random(75, 256);

  int greenvalue = int(y);

  // RGB is default color mode: fill(R,G,B,opacity)

  fill(25, greenvalue, 100, opaqvalue);

}

​

// this is the main program loop. Need to build a pause function. 

​

void draw() {

  // if the mouse key is down, it blanks the canvas

  if (mousePressed == true) {

    background(0);

  } 

  else {  

    // if a key is held, the fill color is black

    if (keyPressed == true) {

      fill(0);

    } 

    else {

      // if a key is not held, fill color is random green

      fillArea();

    }

    // no matter what the fill, draw a circle.

    randomEllipse();

  }

}

​

​