Double Random

Double Random by Ira Greenberg.

Using two random() calls and the point() function to create an irregular sawtooth line.

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int totalPts = 300;
float steps = totalPts + 1;
  
void setup() {
  size(640, 360);
  stroke(255);
  frameRate(1);
} 

void draw() {
  background(0);
  float rand = 0;
  for  (int i = 1; i < steps; i++) {
    point( (width/steps) * i, (height/2) + random(-rand, rand) );
    rand += random(-5, 5);
  }
}

Functions Used

stroke()

Sets the color used to draw lines and borders around shapes

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size()

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

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point()

Draws a point, a coordinate in space at the dimension of one pixel

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setup()

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

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frameRate

The system variable frameRate contains the approximate frame rate of a running sketch

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random()

Generates random numbers

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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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background()

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

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