# GUI pie nodes

Pie nodes are used to create circular or ellipsoid objects ranging from plain circles to pies and square donut shapes.

## Creating a pie node

Right click the Nodes section in the Outline and select Add ▸ Pie. The new pie node is selected and you can modify its properties.

The following properties are unique to pie nodes:

The inner radius of the node, expressed along the X axis.

Outer Bounds

The shape of the outer bounds of the node.

• Ellipse will extend the node to the outer radius.
• Rectangle will extend the node to the node’s bounding box.
Perimeter Vertices

The number of segments that will be used to build the shape, expressed as the number of vertices required to fully circumscribe the 360 degree perimeter of the node.

Pie Fill Angle

How much of the pie should be filled. Expressed as a counter-clockwise angle starting from the right.

If you set a texture on the node, the texture image is applied flat, with the corners of the texture correlating to the corners of the node bounding box.

## Modify pie nodes at runtime

Pie nodes respond to any generic node manipulation functions for setting size, pivot, color and so forth. A few text node only functions and properties exist:

local pienode = gui.get_node("my_pie_node")

-- get the outer bounds
local fill_angle = gui.get_fill_angle(pienode)

-- increase perimeter vertices
local vertices = gui.get_perimeter_vertices(pienode)
gui.set_perimeter_vertices(pienode, vertices + 1)

-- change outer bounds
gui.set_outer_bounds(pienode, gui.PIEBOUNDS_RECTANGLE)