raylib-cs/Examples/Shapes/DrawRectangleRounded.cs

/*******************************************************************************************
*
*   raylib [shapes] example - rounded rectangle drawing
*
*   Example complexity rating: [★★★☆] 3/4
*
*   Example originally created with raylib 2.5, last time updated with raylib 2.5
*
*   Example contributed by Vlad Adrian (@demizdor) 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) 2018-2025 Vlad Adrian (@demizdor) and Ramon Santamaria (@raysan5)
*
********************************************************************************************/

using static Raylib_cs.Raylib;

namespace Examples.Shapes;

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

    public string Name => "Shapes / Draw Rectangle Rounded";

    public string Title => "raylib [shapes] example - rounded rectangle drawing";

    private float roundness;
    private float width;
    private float height;
    private float segments;
    private float lineThick;

    private bool drawRect;
    private bool drawRoundedRect;
    private bool drawRoundedLines;

    public void Init()
    {
        roundness = 0.2f;
        width = 200.0f;
        height = 100.0f;
        segments = 0.0f;
        lineThick = 1.0f;

        drawRect = false;
        drawRoundedRect = true;
        drawRoundedLines = false;
    }

    public void Update()
    {
        // Update
        //----------------------------------------------------------------------------------
        Rectangle rec = new(
            ((float)GetScreenWidth() - width - 250) / 2,
            (GetScreenHeight() - height) / 2.0f,
            (float)width,
            (float)height
        );
        //----------------------------------------------------------------------------------

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

        DrawLine(560, 0, 560, GetScreenHeight(), Fade(Color.LightGray, 0.6f));
        DrawRectangle(560, 0, GetScreenWidth() - 500, GetScreenHeight(), Fade(Color.LightGray, 0.3f));

        if (drawRect)
        {
            DrawRectangleRec(rec, Fade(Color.Gold, 0.6f));
        }
        if (drawRoundedRect)
        {
            DrawRectangleRounded(rec, roundness, (int)segments, Fade(Color.Maroon, 0.2f));
        }
        if (drawRoundedLines)
        {
            DrawRectangleRoundedLinesEx(rec, roundness, (int)segments, lineThick, Fade(Color.Maroon, 0.4f));
        }

        // Draw GUI controls
        //------------------------------------------------------------------------------
        GuiSliderBar(new Rectangle(640, 40, 105, 20), "Width", $"{width:F2}", ref width, 0, (float)GetScreenWidth() - 300);
        GuiSliderBar(new Rectangle(640, 70, 105, 20), "Height", $"{height:F2}", ref height, 0, (float)GetScreenHeight() - 50);
        GuiSliderBar(new Rectangle(640, 140, 105, 20), "Roundness", $"{roundness:F2}", ref roundness, 0.0f, 1.0f);
        GuiSliderBar(new Rectangle(640, 170, 105, 20), "Thickness", $"{lineThick:F2}", ref lineThick, 0, 20);
        GuiSliderBar(new Rectangle(640, 240, 105, 20), "Segments", $"{segments:F2}", ref segments, 0, 60);

        GuiCheckBox(new Rectangle(640, 320, 20, 20), "DrawRoundedRect", ref drawRoundedRect);
        GuiCheckBox(new Rectangle(640, 350, 20, 20), "DrawRoundedLines", ref drawRoundedLines);
        GuiCheckBox(new Rectangle(640, 380, 20, 20), "DrawRect", ref drawRect);
        //------------------------------------------------------------------------------

        var text = $"MODE: {((segments >= 4) ? "MANUAL" : "AUTO")}";
        DrawText(text, 640, 280, 10, (segments >= 4) ? Color.Maroon : Color.DarkGray);
        DrawFPS(10, 10);

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

    public void Unload()
    {
    }

    //----------------------------------------------------------------------------------
    // Minimal raygui-like widgets (plain raylib re-implementation)
    //----------------------------------------------------------------------------------
    private static void GuiSliderBar(Rectangle bounds, string textLeft, string textRight, ref float value, float minValue, float maxValue)
    {
        Vector2 mouse = GetMousePosition();
        bool hover = CheckCollisionPointRec(mouse, bounds);
        if (hover && IsMouseButtonDown(MouseButton.Left))
        {
            value = minValue + ((mouse.X - bounds.X) / bounds.Width) * (maxValue - minValue);
            if (value < minValue) value = minValue;
            if (value > maxValue) value = maxValue;
        }

        DrawRectangleRec(bounds, Color.LightGray);
        float pct = (value - minValue) / (maxValue - minValue);
        DrawRectangleRec(new Rectangle(bounds.X, bounds.Y, bounds.Width * pct, bounds.Height), Color.SkyBlue);
        DrawRectangleLinesEx(bounds, 1, Color.Gray);
        if (!string.IsNullOrEmpty(textLeft)) DrawText(textLeft, (int)bounds.X - MeasureText(textLeft, 10) - 5, (int)(bounds.Y + bounds.Height / 2 - 5), 10, Color.DarkGray);
        if (!string.IsNullOrEmpty(textRight)) DrawText(textRight, (int)(bounds.X + bounds.Width + 5), (int)(bounds.Y + bounds.Height / 2 - 5), 10, Color.DarkGray);
    }

    private static void GuiCheckBox(Rectangle bounds, string text, ref bool active)
    {
        Vector2 mouse = GetMousePosition();
        bool hover = CheckCollisionPointRec(mouse, bounds);
        if (hover && IsMouseButtonPressed(MouseButton.Left)) active = !active;

        DrawRectangleLinesEx(bounds, 1, hover ? Color.DarkBlue : Color.Gray);
        if (active) DrawRectangle((int)bounds.X + 4, (int)bounds.Y + 4, (int)bounds.Width - 8, (int)bounds.Height - 8, Color.DarkGray);
        if (text != null) DrawText(text, (int)(bounds.X + bounds.Width + 8), (int)(bounds.Y + bounds.Height / 2 - 5), 10, Color.DarkGray);
    }

    public static int Main()
    {
        // Initialization
        //--------------------------------------------------------------------------------------
        InitWindow(screenWidth, screenHeight, "raylib [shapes] example - rounded rectangle drawing");

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

        var game = new DrawRectangleRounded();
        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;
    }
}