51 lines
1.8 KiB
C#
51 lines
1.8 KiB
C#
using System;
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namespace Sphere {
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internal class Program {
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private const string Shades = ".:!*oe%&#@";
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private static readonly double[] Light = {30, 30, -50};
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private static void Normalize(double[] v) {
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double len = Math.Sqrt(v[0]*v[0] + v[1]*v[1] + v[2]*v[2]);
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v[0] /= len;
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v[1] /= len;
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v[2] /= len;
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}
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private static double Dot(double[] x, double[] y) {
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double d = x[0]*y[0] + x[1]*y[1] + x[2]*y[2];
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return d < 0 ? -d : 0;
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}
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public static void DrawSphere(double r, double k, double ambient) {
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var vec = new double[3];
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for(var i = (int)Math.Floor(-r); i <= (int)Math.Ceiling(r); i++) {
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double x = i + .5;
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for(var j = (int)Math.Floor(-2*r); j <= (int)Math.Ceiling(2*r); j++) {
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double y = j/2.0 + .5;
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if(x*x + y*y <= r*r) {
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vec[0] = x;
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vec[1] = y;
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vec[2] = Math.Sqrt(r*r - x*x - y*y);
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Normalize(vec);
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double b = Math.Pow(Dot(Light, vec), k) + ambient;
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int intensity = (b <= 0)
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? Shades.Length - 2
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: (int)Math.Max((1 - b)*(Shades.Length - 1), 0);
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Console.Write(Shades[intensity]);
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}
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else
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Console.Write(' ');
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}
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Console.WriteLine();
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}
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}
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private static void Main() {
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Normalize(Light);
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DrawSphere(6, 4, .1);
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DrawSphere(10, 2, .4);
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Console.ReadKey();
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}
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}
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}
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