Example 4: Lighting/Blur effect

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2020-06-06 23-14-33.mp4

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result.mp4

using System;
using odl;

namespace TestNamespace
{
    class Program
    {
        public static void Main(string[] args)
        {
            Graphics.Start();

            Window win = new Window();
            win.Initialize(true, true);

            Viewport vp = new Viewport(0, 0, win.Width, win.Height);

            Sprite s = new Sprite(vp);

            win.Show();

            bool down = false;
            int radius = 1;

            while (Graphics.CanUpdate())
            {
                s.Bitmap?.Dispose();
                s.Bitmap = GenerateLighting(Color.RED, radius);
                s.X = vp.Width / 2 - s.Bitmap.Width / 2;
                s.Y = vp.Height / 2 - s.Bitmap.Height / 2;
                radius += down ? -2 : 2;
                if (radius >= 240) down = true;
                else if (radius <= 2) down = false;
                Graphics.Update(false, true);
            }

            if (!vp.Disposed) vp.Dispose();

            Graphics.Stop();
        }

        public static Bitmap GenerateLighting(Color c, int Radius)
        {
            Bitmap bmp = new Bitmap(Radius * 2 + 1, Radius * 2 + 1);
            bmp.Unlock();
            int mid = Radius;
            for (int x = 0; x < bmp.Width; x++)
            {
                for (int y = 0; y < bmp.Height; y++)
                {
                    double dist = Math.Sqrt(Math.Pow(x - mid, 2) + Math.Pow(y - mid, 2));
                    if (dist >= Radius) continue;
                    double fraction = 1 - dist / Radius;
                    bmp.SetPixel(x, y, c.Red, c.Green, c.Blue, Convert.ToByte(255 * fraction));
                }
            }
            bmp.Lock();
            return bmp;
        }
    }
}