# Triangle

Minimal custom-draw example.

```{raw} html
<a class="example-run-button" href="../demos/features_getting_started_triangle.html">▶ Run in browser</a>

```

**Tags:** `getting_started`

The smallest possible SimVX scene. Subclass `Node2D`, override `on_draw()`,
issue immediate-mode polygon and text commands against the renderer.

## How it works

`Triangle` extends `Node2D` and overrides `on_draw(renderer)`. Each frame the
renderer calls `on_draw()` and the node issues draw commands:

1. `renderer.draw_polygon()` takes a list of `(x, y)` vertices and a colour tuple.
2. `renderer.draw_text()` renders a string at a screen position with optional scale.

`App` creates a Vulkan-backed window and runs the scene tree.

## Source

```{literalinclude} ../../examples/features/getting_started/triangle.py
:language: python
:linenos:
```