### Basic Application Setup in Go

Source: https://context7.com/quaadgras/graphics.gd/llms.txt

Demonstrates the fundamental setup for a Go application using graphics.gd. It initializes the SceneTree, adds a 'Hello, World!' label, and starts the scene.

```go
package main

import (
    "graphics.gd/startup"
    "graphics.gd/classdb/Label"
    "graphics.gd/classdb/SceneTree"
)

func main() {
    startup.LoadingScene() // Setup SceneTree and wait for engine

    hello := Label.New()
    hello.SetText("Hello, World!")
    SceneTree.Add(hello)

    startup.Scene() // Start scene and block until shutdown
}
```

--------------------------------

### Installing the `gd` Command-Line Tool

Source: https://github.com/quaadgras/graphics.gd/blob/release/Readme.md

This command installs the `gd` command-line tool, a drop-in replacement for the standard `go` command, specifically designed for projects running within the graphics.gd runtime. Ensure your `$GOPATH/bin` is in your `$PATH` before running this command. The tool simplifies working with graphics.gd projects, including asset management within the Godot Engine editor.

```bash
go install graphics.gd/cmd/gd@release
```

--------------------------------

### Go Hello World Application for Graphics.gd

Source: https://github.com/quaadgras/graphics.gd/blob/release/Readme.md

This Go code snippet demonstrates a basic 'Hello, World!' application using the graphics.gd library. It initializes the SceneTree, creates a Label, configures its appearance and text, adds it to the scene, and starts the engine's main loop. Dependencies include the 'startup', 'Control', 'GUI', 'Label', and 'SceneTree' packages from graphics.gd.

```go
// This file is all you need to start a project.
// Save it somewhere, install the `gd` command and use `gd run` to get started.
package main

import (
	"graphics.gd/startup"

	"graphics.gd/classdb/Control"
	"graphics.gd/classdb/GUI"
	"graphics.gd/classdb/Label"
	"graphics.gd/classdb/SceneTree"
)

func main() {
	startup.LoadingScene() // setup the SceneTree and wait until we have access to engine functionality
	hello := Label.New()
	hello.AsControl().SetAnchorsPreset(Control.PresetFullRect) // expand the label to take up the whole screen.
	hello.SetHorizontalAlignment(GUI.HorizontalAlignmentCenter)
	hello.SetVerticalAlignment(GUI.VerticalAlignmentCenter)
	hello.SetText("Hello, World!")
	SceneTree.Add(hello)
	startup.Scene() // starts up the scene and blocks until the engine shuts down.
}
```

--------------------------------

### Handle Joystick and Gamepad Input

Source: https://context7.com/quaadgras/graphics.gd/llms.txt

Illustrates how to interact with joysticks and gamepads using the Input singleton. This includes getting connected devices, checking button states, reading axis values, and initiating controller vibration. It uses device index for targeting specific controllers.

```go
import "graphics.gd/classdb/Input"

func checkJoystick() {
    // Get connected joypads
    joypads := Input.GetConnectedJoypads()

    // Check joystick button
    if Input.IsJoyButtonPressed(0, Input.JoyButtonA) {
        // A button pressed on first controller
    }

    // Get joystick axis value
    axis := Input.GetJoyAxis(0, Input.JoyAxisLeftX)

    // Start vibration
    Input.StartJoyVibration(0, 0.5, 0.5, 0.5)
}
```

--------------------------------

### Check Keyboard and Mouse Button Input

Source: https://context7.com/quaadgras/graphics.gd/llms.txt

Demonstrates how to check the current state of keyboard keys and mouse buttons using the Input singleton. It shows examples for checking if a specific key or mouse button is pressed, and if any input is currently active.

```go
import "graphics.gd/classdb/Input"

func checkInput() {
    // Check keyboard
    if Input.IsKeyPressed(Input.KeySpace) {
        // Space pressed
    }

    // Check mouse buttons
    if Input.IsMouseButtonPressed(Input.MouseButtonLeft) {
        // Left mouse button pressed
    }

    // Check if anything is pressed
    if Input.IsAnythingPressed() {
        // Some input is active
    }
}
```

--------------------------------

### Handle Action-Based Input Events

Source: https://context7.com/quaadgras/graphics.gd/llms.txt

Explains how to use the Input singleton for action-based input, which abstracts raw input into game-specific actions. It covers checking if an action is pressed, just pressed, getting its strength for analog inputs, and combining actions into a 2D movement vector.

```go
import "graphics.gd/classdb/Input"

func checkActions() {
    // Check if action is pressed
    if Input.IsActionPressed("jump") {
        // Jump action is held
    }

    // Check if action was just pressed this frame
    if Input.IsActionJustPressed("attack") {
        // Attack action triggered
    }

    // Get action strength (for analog input)
    strength := Input.GetActionStrength("move_forward")

    // Get 2D movement vector from actions
    direction := Input.GetVector("move_left", "move_right", "move_up", "move_down")
}
```

--------------------------------

### Declare and Use Uniforms in Godot Shaders Written in Go

Source: https://github.com/quaadgras/graphics.gd/blob/release/shaders/Readme.md

Illustrates how to declare uniforms as fields within a Go shader struct and how to set and get their values. It covers both standard uniforms and those wrapped in PerInstance.

```go
	type MyShader struct {
		CanvasItem.Shader[MyShader]

		MyUniform vec2.XY `gd:"my_uniform"`

		Color shaders.PerInstance[vec4.XYZW] `gd:"color"`
	}

	ms.Color.Value()

	var shader = new(MyShader)
	shaders.Set(&shader.MyUniform, Vector2.New(1, 2))
```

--------------------------------

### Managing Node Groups in SceneTree with Go

Source: https://context7.com/quaadgras/graphics.gd/llms.txt

Provides examples of common operations for managing node groups within the SceneTree. This includes checking for group existence, retrieving nodes, and calling methods or setting properties on all nodes in a group.

```go
import "graphics.gd/classdb/SceneTree"

func groupOperations(node Node.Instance) {
    tree := SceneTree.Get(node)

    // Check if group exists
    if tree.HasGroup("enemies") {
        // Get all nodes in group
        enemies := tree.GetNodesInGroup("enemies")

        // Get first node in group
        first := tree.GetFirstNodeInGroup("enemies")

        // Get node count in group
        count := tree.GetNodeCountInGroup("enemies")
    }

    // Call method on all nodes in group
    tree.CallGroup("enemies", "hide")

    // Set property on all nodes in group
    tree.SetGroup("enemies", "visible", false)
}
```

--------------------------------

### Extending Node Classes in Go

Source: https://context7.com/quaadgras/graphics.gd/llms.txt

Shows how to extend Godot's Node classes using Go with the graphics.gd library. It utilizes graphics.gd/classdb/Node for Node extension and graphics.gd/variant/Float for float types. The example defines a MyNode struct that embeds Node.Extension and implements common Godot lifecycle methods like Ready, Process, and PhysicsProcess. Class registration is done via classdb.Register.

```go
package main

import (
    "graphics.gd/classdb"
    "graphics.gd/classdb/Node"
    "graphics.gd/variant/Float"
)

type MyNode struct {
    Node.Extension[MyNode] `gd:"MyNode"`
}

func (n *MyNode) Ready() {
    // Called when node enters the tree
}

func (n *MyNode) Process(delta Float.X) {
    // Called every frame
}

func (n *MyNode) PhysicsProcess(delta Float.X) {
    // Called every physics frame
}

func main() {
    classdb.Register[MyNode]()
    // Continue with startup...
}
```

--------------------------------

### Calculate Angle and Direction Between Vector2 Points

Source: https://context7.com/quaadgras/graphics.gd/llms.txt

Shows how to work with angles and directions related to Vector2. This includes getting the angle of a vector in radians, rotating a vector, calculating the direction vector between two points, and finding the distance between them. Requires Angle.

```go
import (
    "graphics.gd/variant/Vector2"
    "graphics.gd/variant/Angle"
)

func vectorAngles() {
    v := Vector2.New(1, 1)

    // Get angle in radians
    angle := Vector2.AngleRadians(v)

    // Rotate vector
    rotated := Vector2.Rotated(v, Angle.Radians(1.57)) // ~90 degrees

    // Get direction to another point
    target := Vector2.New(10, 10)
    direction := Vector2.Direction(v, target)

    // Get distance to another point
    distance := Vector2.Distance(v, target)
}
```

--------------------------------

### Passing Optional Arguments in Graphics.gd

Source: https://github.com/quaadgras/graphics.gd/blob/release/Readme.md

This Go code snippet illustrates how to handle optional arguments when calling methods in graphics.gd. Optional arguments are omitted by default. To specify them, an `Instance` must be converted into either the `MoreArgs` or `Advanced` types, as shown in the example of adding a child node.

```go
node.MoreArgs().AddChild(...)
```

--------------------------------

### Create a Basic Sprite2D Instance

Source: https://context7.com/quaadgras/graphics.gd/llms.txt

Shows how to create a new Sprite2D instance. This is the fundamental step for displaying 2D textures. Further configuration like setting the texture, flip, or offset would be done after this initialization.

```go
import (
    "graphics.gd/classdb/Sprite2D"
    "graphics.gd/variant/Vector2"
)

func createSprite() Sprite2D.Instance {
    sprite := Sprite2D.New()
    // Set texture, flip, offset etc.
    return sprite
}
```

--------------------------------

### Graphics GD Startup Initialization

Source: https://github.com/quaadgras/graphics.gd/blob/release/cmd/gd/deprecated.txt

Demonstrates the initialization process for the graphics.gd package using the startup module. It shows how to call loader and loading scene functions.

```gdscript
package P
import "graphics.gd/startup"
func before() { startup.Loader() }
func after()  { startup.LoadingScene() }
```

```gdscript
package P
import "graphics.gd/startup"
func before() { startup.Engine() }
func after()  { startup.Scene() }
```

--------------------------------

### Building a Shared Library with Go for Godot Engine

Source: https://github.com/quaadgras/graphics.gd/blob/release/Readme.md

This command demonstrates how to build a shared library (`.so` file) from a Go project using the standard `go build` command. This is an alternative to using the `gd` command and is suitable for integrating into existing Godot Engine projects. The `-buildmode=c-shared` flag is crucial for creating a C-compatible shared library.

```bash
go build -o example.so -buildmode=c-shared
```

--------------------------------

### Basic Text Label Creation in Go

Source: https://context7.com/quaadgras/graphics.gd/llms.txt

Shows how to create a basic UI text label using the `Label` class in graphics.gd. It covers setting text, alignment, and anchoring the label to fill the screen.

```go
import (
    "graphics.gd/classdb/Label"
    "graphics.gd/classdb/GUI"
    "graphics.gd/classdb/Control"
    "graphics.gd/classdb/SceneTree"
)

func createLabel() {
    label := Label.New()
    label.SetText("Hello, World!")
    label.SetHorizontalAlignment(GUI.HorizontalAlignmentCenter)
    label.SetVerticalAlignment(GUI.VerticalAlignmentCenter)
    label.AsControl().SetAnchorsPreset(Control.PresetFullRect)
    SceneTree.Add(label)
}
```

--------------------------------

### Frame-by-Frame Rendering Loop in Go

Source: https://context7.com/quaadgras/graphics.gd/llms.txt

Illustrates how to set up a rendering loop that processes frames based on delta time. This is crucial for real-time updates and animations in graphics applications.

```go
package main

import "graphics.gd/startup"

func main() {
    frames := startup.Rendering()
    // initialization code here
    for dt := range frames {
        // render frame with delta time
        _ = dt
    }
    // finalize
}
```

--------------------------------

### Creating Timers in SceneTree with Go

Source: https://context7.com/quaadgras/graphics.gd/llms.txt

Demonstrates how to create and manage timers within the Godot SceneTree using graphics.gd. It shows how to set a timer duration and attach a callback function that executes once.

```go
import (
    "fmt"
    "graphics.gd/classdb/SceneTree"
    "graphics.gd/classdb/Node"
    "graphics.gd/variant/Signal"
)

func createTimer(node Node.Instance) {
    fmt.Println("start")
    SceneTree.Get(node).CreateTimer(1.0).OnTimeout(func() {
        fmt.Println("end")
    }, Signal.OneShot)
}
```

--------------------------------

### Define and Implement a Basic Godot Shader in Go

Source: https://github.com/quaadgras/graphics.gd/blob/release/shaders/Readme.md

Demonstrates how to define a basic shader structure in Go for Godot, including Fragment, Material, and Lighting functions. This code is compiled into Godot's GLSL variant.

```go
package main

import (
	"graphics.gd/shaders"
	"graphics.gd/shaders/vec2"
	"graphics.gd/shaders/vec4"
	"graphics.gd/shaders/rgba"
	"graphics.gd/shaders/pipeline/CanvasItem"
)

type MyShader struct {
	CanvasItem.Shader[MyShader]
}

// The pipeline functions are named after what they return, not what they accept as
// input.

// Fragment runs for each point/vertex of the shape/mesh being rendered, should return
// fragment parameters for each point (also known as a vertex shader).
func (MyShader) Fragment(vertex CanvasItem.Vertex) CanvasItem.Fragment {
	return CanvasItem.Fragment{
		Position: vertex.Position,
	}
}

// Material runs for each pixel on each face of the shape being rendered, should return
// the surface parameters for each pixel (also known as a fragment shader). The input
// fragment is a blend of each contributing vertex point.
func (MyShader) Material(fragment CanvasItem.Fragment) CanvasItem.Material {
	return CanvasItem.Material{
		Color: rgba.New(1, 0, 0, 1),
	}
}

// Lighting runs for each light, per pixel for each face of the shape being rendered, should
// return the final color for each pixel (also known as a lighting pass).
func (MyShader) Lighting(material CanvasItem.Material) CanvasItem.Lighting {
	return CanvasItem.Lighting{
		Color: material.Color,
	}
}
```

--------------------------------

### Custom MainLoop Implementation in Go

Source: https://context7.com/quaadgras/graphics.gd/llms.txt

Shows how to implement a custom `MainLoop` for more control over the application's lifecycle. It includes methods for initialization, per-frame processing, and finalization.

```go
package main

import (
    "graphics.gd/startup"
    "graphics.gd/classdb/MainLoop"
    "graphics.gd/variant/Float"
)

type MyLoop struct {
    MainLoop.Extension[MyLoop]
}

func (loop MyLoop) Initialize() {
    // Called once during initialization
}

func (loop MyLoop) Process(delta Float.X) bool {
    // Called each frame. Return true to exit.
    return false
}

func (loop MyLoop) Finalize() {
    // Called before program exits
}

func main() {
    startup.MainLoop(&MyLoop{})
}
```

--------------------------------

### Creating Tweens in SceneTree with Go

Source: https://context7.com/quaadgras/graphics.gd/llms.txt

Illustrates the creation of tweens for animating properties over time using the SceneTree. This is fundamental for creating smooth visual transitions and effects.

```go
import "graphics.gd/classdb/SceneTree"

func createTween(node Node.Instance) {
    tree := SceneTree.Get(node)
    tween := tree.CreateTween()
    // Configure tween animations
}
```

--------------------------------

### Scene Management in SceneTree with Go

Source: https://context7.com/quaadgras/graphics.gd/llms.txt

Demonstrates various scene management functionalities provided by the SceneTree, such as changing scenes, reloading, unloading, accessing the current scene, and pausing/unpausing the game.

```go
import "graphics.gd/classdb/SceneTree"

func sceneManagement(node Node.Instance) {
    tree := SceneTree.Get(node)

    // Change scene by file path
    tree.ChangeSceneToFile("res://scenes/level2.tscn")

    // Reload current scene
    tree.ReloadCurrentScene()

    // Unload current scene
    tree.UnloadCurrentScene()

    // Get current scene
    current := tree.CurrentScene()

    // Pause/unpause
    tree.SetPaused(true)
}
```

--------------------------------

### Perform Basic Vector2 Arithmetic and Operations

Source: https://context7.com/quaadgras/graphics.gd/llms.txt

Covers fundamental operations on Vector2 objects, including creation, addition, subtraction, multiplication, scaling, calculating length, normalization, dot product, and cross product. These are essential for 2D geometry calculations.

```go
import "graphics.gd/variant/Vector2"

func vectorBasics() {
    // Create vectors
    v1 := Vector2.New(3.0, 4.0)
    v2 := Vector2.New(1.0, 2.0)

    // Arithmetic
    sum := Vector2.Add(v1, v2)
    diff := Vector2.Sub(v1, v2)
    product := Vector2.Mul(v1, v2)
    scaled := Vector2.MulX(v1, 2.0)

    // Length and normalization
    length := Vector2.Length(v1)
    normalized := Vector2.Normalized(v1)

    // Dot and cross products
    dot := Vector2.Dot(v1, v2)
    cross := Vector2.Cross(v1, v2)
}
```

--------------------------------

### Configure Text Wrapping and Clipping for Labels

Source: https://context7.com/quaadgras/graphics.gd/llms.txt

Demonstrates how to configure text wrapping, clipping, and ellipsis for Label nodes. This function utilizes the TextServer constants for different wrapping and overrun behaviors. It's useful for managing text display within constrained areas.

```go
import (
    "graphics.gd/classdb/Label"
    "graphics.gd/classdb/TextServer"
)

func configureTextWrapping(label Label.Instance) {
    // Enable text wrapping
    label.SetAutowrapMode(TextServer.AutowrapWord)

    // Enable text clipping
    label.SetClipText(true)

    // Set overrun behavior
    label.SetTextOverrunBehavior(TextServer.OverrunTrimEllipsis)

    // Limit visible lines
    label.SetMaxLinesVisible(3)
}
```

--------------------------------

### Label Text Animation in Go

Source: https://context7.com/quaadgras/graphics.gd/llms.txt

Explains how to animate text appearance in a `Label` node. It covers methods for controlling visible characters and visible ratio, enabling effects like typewriter text.

```go
import "graphics.gd/classdb/Label"

func animateLabel(label Label.Instance) {
    // Get text metrics
    lineCount := label.GetLineCount()
    visibleLines := label.GetVisibleLineCount()
    charCount := label.GetTotalCharacterCount()

    // Animate text appearance
    label.SetVisibleCharacters(0)
    // Increment visible characters over time for typewriter effect
    label.SetVisibleCharacters(10)

    // Or use visible ratio (0.0 to 1.0)
    label.SetVisibleRatio(0.5) // Show half the text
}
```

--------------------------------

### Perform Vector2 Interpolation

Source: https://context7.com/quaadgras/graphics.gd/llms.txt

Demonstrates various methods for interpolating between two Vector2 points. This includes linear interpolation (Lerp), spherical linear interpolation (Slerp), moving towards a target, and Bezier curve interpolation. Requires Angle for Slerp.

```go
import (
    "graphics.gd/variant/Vector2"
    "graphics.gd/variant/Angle"
)

func vectorInterpolation() {
    start := Vector2.New(0, 0)
    end := Vector2.New(100, 100)

    // Linear interpolation
    midpoint := Vector2.Lerp(start, end, 0.5)

    // Spherical linear interpolation
    slerped := Vector2.Slerp(start, end, Angle.Radians(0.5))

    // Move toward target
    moved := Vector2.Move(start, end, 10.0)

    // Bezier interpolation
    control1 := Vector2.New(25, 50)
    control2 := Vector2.New(75, 50)
    bezier := Vector2.BezierInterpolate(start, control1, control2, end, 0.5)
}
```

--------------------------------

### Shader with Uniforms in Go

Source: https://context7.com/quaadgras/graphics.gd/llms.txt

Demonstrates a custom shader in Go that includes uniforms for custom parameters and per-instance values. It uses graphics.gd/shaders/vec2, graphics.gd/shaders/vec4, and graphics.gd/variant/Vector2 for vector types. Uniforms are defined as struct fields with `gd` tags, and their values can be set using the shaders.Set function.

```go
package main

import (
    "graphics.gd/shaders"
    "graphics.gd/shaders/vec2"
    "graphics.gd/shaders/vec4"
    "graphics.gd/shaders/pipeline/CanvasItem"
    "graphics.gd/variant/Vector2"
)

type CustomShader struct {
    CanvasItem.Shader[CustomShader]

    // Uniforms are struct fields
    MyUniform vec2.XY `gd:"my_uniform"`

    // Per-instance uniform
    Color shaders.PerInstance[vec4.XYZW] `gd:"color"`
}

func main() {
    shader := new(CustomShader)

    // Set uniform values
    shaders.Set(&shader.MyUniform, Vector2.New(1, 2))

    // Access per-instance value in shader code
    // shader.Color.Value()
}
```

--------------------------------

### Basic Canvas Item Shader in Go

Source: https://context7.com/quaadgras/graphics.gd/llms.txt

Defines a basic shader for CanvasItems in Go, setting a solid red color. It utilizes the graphics.gd/shaders/pipeline/CanvasItem package for shader structure and graphics.gd/shaders/rgba for color definition. This shader has no external dependencies beyond the graphics.gd library.

```go
package main

import (
    "graphics.gd/shaders"
    "graphics.gd/shaders/rgba"
    "graphics.gd/shaders/pipeline/CanvasItem"
)

type RedShader struct {
    CanvasItem.Shader[RedShader]
}

func (RedShader) Fragment(vertex CanvasItem.Vertex) CanvasItem.Fragment {
    return CanvasItem.Fragment{
        Position: vertex.Position,
    }
}

func (RedShader) Material(fragment CanvasItem.Fragment) CanvasItem.Material {
    return CanvasItem.Material{
        Color: rgba.New(1, 0, 0, 1), // Red color
    }
}

func (RedShader) Lighting(material CanvasItem.Material) CanvasItem.Lighting {
    return CanvasItem.Lighting{
        Color: material.Color,
    }
}
```

--------------------------------

### Handle Mouse Clicks on Sprite2D

Source: https://context7.com/quaadgras/graphics.gd/llms.txt

Provides a function to detect mouse clicks within the bounds of a Sprite2D. It checks if the event is a mouse button event and if the click position, converted to local coordinates, falls within the sprite's rectangle. Requires InputEventMouseButton and Rect2.

```go
import (
    "fmt"
    "graphics.gd/classdb/Sprite2D"
    "graphics.gd/classdb/InputEvent"
    "graphics.gd/classdb/InputEventMouseButton"
    "graphics.gd/variant/Object"
    "graphics.gd/variant/Rect2"
)

func handleSpriteInput(sprite Sprite2D.Instance, event InputEvent.Instance) {
    if inputEventMouse, ok := Object.As[InputEventMouseButton.Instance](event); ok {
        rect := sprite.GetRect()
        localPos := sprite.AsNode2D().ToLocal(inputEventMouse.AsInputEventMouse().Position())
        if Rect2.HasPoint(rect, localPos) {
            fmt.Println("Sprite clicked!")
        }
    }
}
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.