raylib-cs/Examples/Core/ScissorTest.cs

/*******************************************************************************************
*
*   raylib [core] example - scissor test
*
*   Example complexity rating: [★☆☆☆] 1/4
*
*   Example originally created with raylib 2.5, last time updated with raylib 3.0
*
*   Example contributed by Chris Dill (@MysteriousSpace) and reviewed by Ramon Santamaria (@raysan5)
*
*   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) 2019-2025 Chris Dill (@MysteriousSpace)
*
********************************************************************************************/

namespace Examples.Core;

public partial class ScissorTest : IExample
{
    private const int screenWidth = 800;
    private const int screenHeight = 450;

    public string Name => "Core / Scissor Test";

    public string Title => "raylib [core] example - scissor test";

    private Rectangle scissorArea;
    private bool scissorMode;

    public void Init()
    {
        scissorArea = new(0, 0, 300, 300);
        scissorMode = true;
    }

    public void Update()
    {
        // Update
        //----------------------------------------------------------------------------------
        if (IsKeyPressed(KeyboardKey.S))
        {
            scissorMode = !scissorMode;
        }

        // Centre the scissor area around the mouse position
        scissorArea.X = GetMouseX() - scissorArea.Width / 2;
        scissorArea.Y = GetMouseY() - scissorArea.Height / 2;
        //----------------------------------------------------------------------------------

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

        if (scissorMode)
        {
            BeginScissorMode((int)scissorArea.X, (int)scissorArea.Y, (int)scissorArea.Width, (int)scissorArea.Height);
        }

        // Draw full screen rectangle and some text
        // NOTE: Only part defined by scissor area will be rendered
        DrawRectangle(0, 0, GetScreenWidth(), GetScreenHeight(), Color.Red);
        DrawText("Move the mouse around to reveal this text!", 190, 200, 20, Color.LightGray);

        if (scissorMode)
        {
            EndScissorMode();
        }

        DrawRectangleLinesEx(scissorArea, 1, Color.Black);
        DrawText("Press S to toggle scissor test", 10, 10, 20, Color.Black);

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

    public void Unload()
    {
    }

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

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

        var game = new ScissorTest();
        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;
    }
}