# Shape Primitives.

Shape Primitives.

The basic shape primitive functions are triangle(), rect(), quad(), ellipse(), and arc(). Squares are made with rect() and circles are made with ellipse(). Each of these functions requires a number of parameters to determine the shape’s position and size.

```
size(640, 360);
background(0);
noStroke();

fill(204);
triangle(18, 18, 18, 360, 81, 360);

fill(102);
rect(81, 81, 63, 63);

fill(204);
quad(189, 18, 216, 18, 216, 360, 144, 360);

fill(255);
ellipse(252, 144, 72, 72);

fill(204);
triangle(288, 18, 351, 360, 288, 360);

fill(255);
arc(479, 300, 280, 280, PI, TWO_PI);

```

## 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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ellipse()

Draws an ellipse (oval) to the screen

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rect()

Draws a rectangle to the screen

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quad()

A quad is a quadrilateral, a four sided polygon

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triangle()

A triangle is a plane created by connecting three points

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noStroke()

Disables drawing the stroke (outline)

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arc()

Draws an arc to the screen

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background()

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

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