Recursion.

Recursion.

A demonstration of recursion, which means functions call themselves. Notice how the drawCircle() function calls itself at the end of its block. It continues to do this until the variable “level” is equal to 1.

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void setup() {
  size(640, 360);
  noStroke();
  noLoop();
}

void draw() {
  drawCircle(width/2, 280, 6);
}

void drawCircle(int x, int radius, int level) {                    
  float tt = 126 * level/4.0;
  fill(tt);
  ellipse(x, height/2, radius*2, radius*2);      
  if(level > 1) {
    level = level - 1;
    drawCircle(x - radius/2, radius/2, level);
    drawCircle(x + radius/2, radius/2, level);
  }
}

Functions Used

fill()

Sets the color used to fill shapes

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size()

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

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if

Allows the program to make a decision about which code to execute

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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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noLoop()

Stops Processing from continuously executing the code within draw()

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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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noStroke()

Disables drawing the stroke (outline)

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