raylib-cs/Examples/Shapes/EasingsRectangleArray.cs

/*******************************************************************************************
*
*   raylib [shapes] example - easings rectangle array
*
*   NOTE: This example requires 'easings.h' library, provided on raylib/src. Just copy
*   the library to same directory as example or make sure it's available on include path.
*
*   This example has been created using raylib 2.0 (www.raylib.com)
*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
*
*   Copyright (c) 2014-2019 Ramon Santamaria (@raysan5)
*
********************************************************************************************/

using System.Numerics;
using static Raylib_cs.Raylib;
using Examples.Shared;

namespace Examples.Shapes;

public class EasingsRectangleArray
{
    public const int RecsWidth = 50;
    public const int RecsHeight = 50;
    public const int MaxRecsX = 800 / RecsWidth;
    public const int MaxRecsY = 450 / RecsHeight;

    // At 60 fps = 4 seconds
    public const int PlayTimeInFrames = 240;

    public static int Main()
    {
        // Initialization
        //--------------------------------------------------------------------------------------
        const int screenWidth = 800;
        const int screenHeight = 450;

        InitWindow(screenWidth, screenHeight, "raylib [shapes] example - easings rectangle array");

        Rectangle[] recs = new Rectangle[MaxRecsX * MaxRecsY];

        for (int y = 0; y < MaxRecsY; y++)
        {
            for (int x = 0; x < MaxRecsX; x++)
            {
                recs[y * MaxRecsX + x].X = RecsWidth / 2 + RecsWidth * x;
                recs[y * MaxRecsX + x].Y = RecsHeight / 2 + RecsHeight * y;
                recs[y * MaxRecsX + x].Width = RecsWidth;
                recs[y * MaxRecsX + x].Height = RecsHeight;
            }
        }

        float rotation = 0.0f;
        int framesCounter = 0;

        // Rectangles animation state: 0-Playing, 1-Finished
        int state = 0;

        SetTargetFPS(60);
        //--------------------------------------------------------------------------------------

        // Main game loop
        while (!WindowShouldClose())
        {
            // Update
            //----------------------------------------------------------------------------------
            if (state == 0)
            {
                framesCounter++;

                for (int i = 0; i < MaxRecsX * MaxRecsY; i++)
                {
                    recs[i].Height = Easings.EaseCircOut(framesCounter, RecsHeight, -RecsHeight, PlayTimeInFrames);
                    recs[i].Width = Easings.EaseCircOut(framesCounter, RecsWidth, -RecsWidth, PlayTimeInFrames);

                    if (recs[i].Height < 0)
                    {
                        recs[i].Height = 0;
                    }
                    if (recs[i].Width < 0)
                    {
                        recs[i].Width = 0;
                    }

                    // Finish playing
                    if ((recs[i].Height == 0) && (recs[i].Width == 0))
                    {
                        state = 1;
                    }
                    rotation = Easings.EaseLinearIn(framesCounter, 0.0f, 360.0f, PlayTimeInFrames);
                }
            }
            else if ((state == 1) && IsKeyPressed(KeyboardKey.Space))
            {
                // When animation has finished, press space to restart
                framesCounter = 0;

                for (int i = 0; i < MaxRecsX * MaxRecsY; i++)
                {
                    recs[i].Height = RecsHeight;
                    recs[i].Width = RecsWidth;
                }

                state = 0;
            }
            //----------------------------------------------------------------------------------

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

            if (state == 0)
            {
                for (int i = 0; i < MaxRecsX * MaxRecsY; i++)
                {
                    DrawRectanglePro(
                        recs[i],
                        new Vector2(recs[i].Width / 2, recs[i].Height / 2),
                        rotation,
                        Color.Red
                    );
                }
            }
            else if (state == 1)
            {
                DrawText("PRESS [SPACE] TO PLAY AGAIN!", 240, 200, 20, Color.Gray);
            }

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

        // De-Initialization
        //--------------------------------------------------------------------------------------
        CloseWindow();
        //--------------------------------------------------------------------------------------

        return 0;
    }
}