init

Raytracer/Program.cs

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+// See https://aka.ms/new-console-template for more information
+
+using System.Text;
+using System.Text.Encodings;
+
+namespace Ray
+{
+    struct Vec3
+    {
+        double x, y, z;
+    }
+
+    readonly struct Color
+    {
+        public readonly byte r, g, b;
+        
+        public Color(byte r, byte g, byte b)
+        {
+            this.r = r;
+            this.g = g;
+            this.b = b;
+        }
+    }
+
+    class BitmapImage
+    {
+        public readonly UInt16 width, height;
+        private Color[,] pixels;
+
+
+        public BitmapImage(UInt16 width, UInt16 height)
+        {
+            this.width = width;
+            this.height = height;
+            this.pixels = new Color[width,height]; 
+        }
+
+        public void setPixel(in UInt16 x, in UInt16 y, in Color c)
+        {
+            this.pixels[x,y] = c;
+        }
+
+        public void writeImage(in string path)
+        {
+            //Rows in BMP images must be divisibly by 4... for some reason.
+            int padding = (4 - (width * 3) % 4) % 4;
+            //8 bit color depth + 26 bytes for header and BITMAPCORE header
+            Int32 bfSize = (width * height * 3) + (padding * this.height) + 26;
+            
+            using (FileStream fs = new FileStream(path, FileMode.Create))
+            using (BinaryWriter bw = new BinaryWriter(fs))
+            {
+                //File header
+                bw.Write('B');
+                bw.Write('M');
+                bw.Write(bfSize);
+                bw.Write((Int32)0); //bfReserved 1 and 2
+                bw.Write((Int32)26);
+                //DIB header (Bitmap core)
+                bw.Write((Int32)12);
+                bw.Write(this.width);
+                bw.Write(this.height);
+                bw.Write((Int16)1);
+                bw.Write((Int16)24);
+
+                for (ushort i = 0; i < this.width; i++)
+                {
+                    for (ushort j = 0; j < this.height; j++)
+                    {
+                        bw.Write(this.pixels[i, j].b);
+                        bw.Write(this.pixels[i, j].g);
+                        bw.Write(this.pixels[i, j].r);
+                    }
+                    for (ushort j = 0; j < padding; j++) //end-of-row padding.
+                    {
+                        bw.Write((byte)0);
+                    }
+                }
+            }
+        }
+    }
+    class Raytracer
+    {
+        static void Main()
+        {
+            var BMP = new BitmapImage(255, 255);
+            for (ushort i = 0; i < 255; i++)
+            {
+                for (ushort j = 0; j < 255; j++)
+                {
+                    BMP.setPixel(i, j, new Color((byte)i, 0, (byte)j));
+                }
+            }
+
+            for (ushort i = 200; i < 255; i++)
+            {
+                for (ushort j = 200; j < 255; j++)
+                {
+                    BMP.setPixel(i, j, new Color(0, 255, 0));
+                }
+            }
+
+            BMP.writeImage("C:/Users/Lizzy/test2.bmp");
+        }
+    }
+};