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@@ -0,0 +1,72 @@
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+using System;
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+using System.Collections.Generic;
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+using System.Text;
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+
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+namespace PointCloudGalaxy
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+{
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+ // based on: https://itinerantgames.tumblr.com/post/78592276402/a-2d-procedural-galaxy-with-c
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+
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+ class Galaxy
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+ {
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+ public int numArms = 5;
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+
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+ public float armSeparationDistance => 2 * (float)Math.PI / numArms;
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+
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+ public float armOffsetMax = 0.5f;
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+ public float rotationFactor = 5;
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+ public float randomJitter = 0.02f;
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+
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+ public float scaleOverPlane = 0.15f;
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+
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+ public IEnumerable<System.Numerics.Vector3> CreateStarts(int count)
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+ {
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+ var randomizer = new Random();
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+
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+ float RndFloat(double min, double max) { return (float)(randomizer.NextDouble() * (max-min) + min); }
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+
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+ for (int i = 0; i < count; i++)
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+ {
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+ var p = CreateRandomStar(RndFloat);
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+
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+ yield return p;
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+ }
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+ }
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+
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+ private System.Numerics.Vector3 CreateRandomStar(Func<double, double, float> rndFloat)
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+ {
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+ // Choose a distance from the center of the galaxy.
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+ float distance = rndFloat(0,1);
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+ distance = (float)Math.Pow(distance, 2);
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+
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+ // Choose an angle between 0 and 2 * PI.
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+ float angle = rndFloat(0, 2 * Math.PI);
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+ float armOffset = rndFloat(0, armOffsetMax);
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+ armOffset = armOffset - armOffsetMax / 2;
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+ armOffset = armOffset * (1 / distance);
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+
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+ float squaredArmOffset = (float)Math.Pow(armOffset, 2);
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+ if (armOffset < 0) squaredArmOffset = squaredArmOffset * -1;
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+
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+ armOffset = squaredArmOffset;
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+
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+ float rotation = distance * rotationFactor;
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+
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+ angle = (int)(angle / armSeparationDistance) * armSeparationDistance + armOffset + rotation;
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+
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+ // Convert polar coordinates to 2D cartesian coordinates.
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+ var starX = (float)Math.Cos(angle) * distance;
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+ var starY = (float)Math.Sin(angle) * distance;
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+
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+ // calculate height over galaxy plane
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+ var starH = rndFloat(-1,1);
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+ starH *= 1.0f - distance;
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+ starH *= scaleOverPlane;
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+
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+ starX += rndFloat(-1, 1) * 0.5f * randomJitter;
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+ starY += rndFloat(-1, 1) * 0.5f * randomJitter;
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+ starH += rndFloat(-1, 1) * 0.5f * randomJitter;
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+
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+ return new System.Numerics.Vector3(starX, starH, starY);
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+ }
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+ }
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+}
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Vicente Penades