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Remove mandelbrot example due to conflicting license

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Closes #1423
Closes #1424
This commit is contained in:
Patrik Svensson 2024-01-03 21:20:00 +01:00 committed by Patrik Svensson
parent 6f1f29967d
commit 7cf7e84dd8
2 changed files with 1 additions and 91 deletions
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86
examples/Console/Canvas/Mandelbrot.cs
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@ -1,86 +0,0 @@
/*
Ported from: https://rosettacode.org/wiki/Mandelbrot_set#C.23
Licensed under GNU Free Documentation License 1.2
*/
using System;
using Spectre.Console;
namespace Canvas;
public static class Mandelbrot
{
private const double MaxValueExtent = 2.0;
private struct ComplexNumber
{
public double Real { get; }
public double Imaginary { get; }
public ComplexNumber(double real, double imaginary)
{
Real = real;
Imaginary = imaginary;
}
public static ComplexNumber operator +(ComplexNumber x, ComplexNumber y)
{
return new ComplexNumber(x.Real + y.Real, x.Imaginary + y.Imaginary);
}
public static ComplexNumber operator *(ComplexNumber x, ComplexNumber y)
{
return new ComplexNumber(x.Real * y.Real - x.Imaginary * y.Imaginary,
x.Real * y.Imaginary + x.Imaginary * y.Real);
}
public double Abs()
{
return Real * Real + Imaginary * Imaginary;
}
}
public static Spectre.Console.Canvas Generate(int width, int height)
{
var canvas = new Spectre.Console.Canvas(width, height);
var scale = 2 * MaxValueExtent / Math.Min(canvas.Width, canvas.Height);
for (var i = 0; i < canvas.Height; i++)
{
var y = (canvas.Height / 2 - i) * scale;
for (var j = 0; j < canvas.Width; j++)
{
var x = (j - canvas.Width / 2) * scale;
var value = Calculate(new ComplexNumber(x, y));
canvas.SetPixel(j, i, GetColor(value));
}
}
return canvas;
}
private static double Calculate(ComplexNumber c)
{
const int MaxIterations = 1000;
const double MaxNorm = MaxValueExtent * MaxValueExtent;
var iteration = 0;
var z = new ComplexNumber();
do
{
z = z * z + c;
iteration++;
} while (z.Abs() < MaxNorm && iteration < MaxIterations);
return iteration < MaxIterations
? (double)iteration / MaxIterations
: 0;
}
private static Color GetColor(double value)
{
const double MaxColor = 256;
const double ContrastValue = 0.2;
return new Color(0, 0, (byte)(MaxColor * Math.Pow(value, ContrastValue)));
}
}

6
examples/Console/Canvas/Program.cs
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@ -10,10 +10,6 @@ public static class Program
{
public static void Main()
{
// Draw a mandelbrot set using a Canvas
var mandelbrot = Mandelbrot.Generate(32, 32);
Render(mandelbrot, "Mandelbrot");
// Draw an image using CanvasImage powered by ImageSharp.
// This requires the "Spectre.Console.ImageSharp" NuGet package.
var image = new CanvasImage("cake.png");
@ -21,7 +17,7 @@ public static class Program
image.MaxWidth(16);
Render(image, "Image from file (16 wide)");
// Draw image again, but without render width
// Draw image again, but without max width
image.NoMaxWidth();
image.Mutate(ctx => ctx.Grayscale().Rotate(-45).EntropyCrop());
Render(image, "Image from file (fit, greyscale, rotated)");