# NanoVG API<no value>
The Microsoft Flight Simulator Nano VG {{< glossterm >}}api{{< /glossterm >}} (also known as the *low level API*) exposes 13 general render functions, 20 map rendering functions, and a few structures that allow C/C++ gauges to be drawn into the provided in-game bitmap. All the functions use a `ctx` parameter of type `FsContext` which is provided as an argument of the gauge callback. More information can be found from the links provided below for the various functions and structures.

 

You can find a sample project to use as a reference when using the NanoVG API here:

-   [GdiplusAircraft](../../../samples-tutorials/samples/simobjects-aircraft/modularaircraft/gdiplusaircraft/)

 

 

### Render Functions

These functions provide basic render support:

{{< table-wrapper >}}

| Function                 | Description                                               |
|--------------------------|-----------------------------------------------------------|
| `fsRenderCreate`         | Creates a new rendering context in the sim.               |
| `fsRenderCreateTexture`  | Creates a new texture.                                    |
| `fsRenderGetTextureSize` | Gets the specified texture size.                          |
| `fsRenderClearStencil`   | Clears the stencil buffer of the specified context.       |
| `fsRenderFill`           | Fills the specified shapes.                               |
| `fsRenderStroke`         | Strokes the specified shapes.                             |
| `fsRenderTriangles`      | Renders the specified triangles.                          |
| `fsRenderUpdateTexture`  | Updates part or all of a texture.                         |
| `fsRenderViewport`       | Specifies the viewport to be used when drawing the gauge. |
| `fsRenderFlush`          | Flushes (executes) the current rendering commands.        |
| `fsRenderCancel`         | Cancels the current rendering commands.                   |
| `fsRenderDeleteTexture`  | Deletes a texture.                                        |
| `fsRenderDelete`         | Deletes the specified context.                            |

{{< /table-wrapper >}}


 

 

### Structures:

The following structs are used by various functions in the WASM low-level API.

{{< table-wrapper >}}

| Structure              | Description                                                                                                  |
|------------------------|--------------------------------------------------------------------------------------------------------------|
| `FsColor`              | Represents a typical color through its Red, Green, Blue and Alpha components.                                |
| `FsCompositeOperation` | Represents a composite operation used to combined a source pixel and a destination pixel into a final pixel. |
| `FsPaint`              | Represents a color, gradient or image pattern used to fill shapes.                                           |
| `FsPath`               | Represents a shape to be drawn.                                                                              |
| `FsScissor`            | Represents a rectangular region, potentially transformed, that can be used as a mask.                        |
| `FsVertex`             | Represents a typical 2D vertex.                                                                              |

{{< /table-wrapper >}}