# Noise Wave

Noise Wave by Daniel Shiffman.

Using Perlin Noise to generate a wave-like pattern.

```
float yoff = 0.0;        // 2nd dimension of perlin noise

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

void draw() {
background(51);

fill(255);
// We are going to draw a polygon out of the wave points
beginShape();

float xoff = 0;       // Option #1: 2D Noise
// float xoff = yoff; // Option #2: 1D Noise

// Iterate over horizontal pixels
for (float x = 0; x <= width; x += 10) {
// Calculate a y value according to noise, map to
float y = map(noise(xoff, yoff), 0, 1, 200,300); // Option #1: 2D Noise
// float y = map(noise(xoff), 0, 1, 200,300);    // Option #2: 1D Noise

// Set the vertex
vertex(x, y);
// Increment x dimension for noise
xoff += 0.05;
}
// increment y dimension for noise
yoff += 0.01;
vertex(width, height);
vertex(0, height);
endShape(CLOSE);
}
```

## 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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vertex()

All shapes are constructed by connecting a series of vertices

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beginShape()

Using the beginShape() and endShape() functions allow creating more complex forms

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setup()

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

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map()

Re-maps a number from one range to another

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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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noise()

Returns the Perlin noise value at specified coordinates

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endShape()

The endShape() function is the companion to beginShape() and may only be called after beginShape()

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background()

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

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