raylib-cs/Examples/Core/InputGestures.cs

/*******************************************************************************************
*
*   raylib [core] example - input gestures
*
*   Example complexity rating: [★★☆☆] 2/4
*
*   Example originally created with raylib 1.4, last time updated with raylib 4.2
*
*   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
*   BSD-like license that allows static linking with closed source software
*
*   Copyright (c) 2016-2025 Ramon Santamaria (@raysan5)
*
********************************************************************************************/

namespace Examples.Core;

public partial class InputGestures : IExample
{
    public const int MaxGestureStrings = 20;

    private const int screenWidth = 800;
    private const int screenHeight = 450;

    private Vector2 touchPosition;
    private Rectangle touchArea;

    private int gesturesCount;
    private string[] gestureStrings;

    private Gesture currentGesture;
    private Gesture lastGesture;

    public string Name => "Core / Input Gestures";

    public string Title => "raylib [core] example - input gestures";

    public void Init()
    {
        touchPosition = new(0, 0);
        touchArea = new(220, 10, screenWidth - 230, screenHeight - 20);

        gesturesCount = 0;
        gestureStrings = new string[MaxGestureStrings];

        currentGesture = Gesture.None;
        lastGesture = Gesture.None;

        // SetGesturesEnabled(0b0000000000001001);   // Enable only some gestures to be detected
    }

    public void Update()
    {
        // Update
        //----------------------------------------------------------------------------------
        lastGesture = currentGesture;
        currentGesture = GetGestureDetected();
        touchPosition = GetTouchPosition(0);

        if (CheckCollisionPointRec(touchPosition, touchArea) && (currentGesture != Gesture.None))
        {
            if (currentGesture != lastGesture)
            {
                // Store gesture string
                switch ((Gesture)currentGesture)
                {
                    case Gesture.Tap:
                        gestureStrings[gesturesCount] = "GESTURE TAP";
                        break;
                    case Gesture.DoubleTap:
                        gestureStrings[gesturesCount] = "GESTURE DOUBLETAP";
                        break;
                    case Gesture.Hold:
                        gestureStrings[gesturesCount] = "GESTURE HOLD";
                        break;
                    case Gesture.Drag:
                        gestureStrings[gesturesCount] = "GESTURE DRAG";
                        break;
                    case Gesture.SwipeRight:
                        gestureStrings[gesturesCount] = "GESTURE SWIPE RIGHT";
                        break;
                    case Gesture.SwipeLeft:
                        gestureStrings[gesturesCount] = "GESTURE SWIPE LEFT";
                        break;
                    case Gesture.SwipeUp:
                        gestureStrings[gesturesCount] = "GESTURE SWIPE UP";
                        break;
                    case Gesture.SwipeDown:
                        gestureStrings[gesturesCount] = "GESTURE SWIPE DOWN";
                        break;
                    case Gesture.PinchIn:
                        gestureStrings[gesturesCount] = "GESTURE PINCH IN";
                        break;
                    case Gesture.PinchOut:
                        gestureStrings[gesturesCount] = "GESTURE PINCH OUT";
                        break;
                    default:
                        break;
                }

                gesturesCount++;

                // Reset gestures strings
                if (gesturesCount >= MaxGestureStrings)
                {
                    for (var i = 0; i < MaxGestureStrings; i++)
                    {
                        gestureStrings[i] = " ";
                    }
                    gesturesCount = 0;
                }
            }
        }
        //----------------------------------------------------------------------------------

        // Draw
        //----------------------------------------------------------------------------------
        BeginDrawing();
        ClearBackground(Color.RayWhite);

        DrawRectangleRec(touchArea, Color.Gray);
        DrawRectangle(225, 15, screenWidth - 240, screenHeight - 30, Color.RayWhite);

        DrawText("GESTURES TEST AREA", screenWidth - 270, screenHeight - 40, 20, Fade(Color.Gray, 0.5f));

        for (var i = 0; i < gesturesCount; i++)
        {
            if (i % 2 == 0)
            {
                DrawRectangle(10, 30 + 20 * i, 200, 20, Fade(Color.LightGray, 0.5f));
            }
            else
            {
                DrawRectangle(10, 30 + 20 * i, 200, 20, Fade(Color.LightGray, 0.3f));
            }

            if (i < gesturesCount - 1)
            {
                DrawText(gestureStrings[i], 35, 36 + 20 * i, 10, Color.DarkGray);
            }
            else
            {
                DrawText(gestureStrings[i], 35, 36 + 20 * i, 10, Color.Maroon);
            }
        }

        DrawRectangleLines(10, 29, 200, screenHeight - 50, Color.Gray);
        DrawText("DETECTED GESTURES", 50, 15, 10, Color.Gray);

        if (currentGesture != Gesture.None)
        {
            DrawCircleV(touchPosition, 30, Color.Maroon);
        }

        EndDrawing();
        //----------------------------------------------------------------------------------
    }

    public void Unload()
    {
    }

    public static int Main()
    {
        // Initialization
        //--------------------------------------------------------------------------------------
        InitWindow(screenWidth, screenHeight, "raylib [core] example - input gestures");

        SetTargetFPS(60);               // Set our game to run at 60 frames-per-second
        //--------------------------------------------------------------------------------------

        var game = new InputGestures();
        game.Init();

        // Main game loop
        while (!WindowShouldClose())    // Detect window close button or ESC key
        {
            game.Update();
        }

        game.Unload();

        // De-Initialization
        //--------------------------------------------------------------------------------------
        CloseWindow();        // Close window and OpenGL context
        //--------------------------------------------------------------------------------------

        return 0;
    }
}