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flatten random distribution (#79)

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The circle calculation leaned towards the outer edge.
A new donut calculation flattens that issue
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Leaf26 2021-08-26 15:12:26 -04:00 committed by GitHub
parent db14e688b9
commit e6d5802bba
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1 changed files with 9 additions and 3 deletions
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src/main/java/me/SuperRonanCraft/BetterRTP/references/worlds/WorldPlayer.java
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@ -164,11 +164,17 @@ public class WorldPlayer implements RTPWorld {
} }
private Location generateRound(int maxRad, int min) { private Location generateRound(int maxRad, int min) {
//Generate a random X and Z based off the quadrant selected //Generate a random X and Z based off location on a spiral curve
int max = maxRad - min; int max = maxRad - min;
int x, z; int x, z;
double r = max * Math.sqrt(new Random().nextDouble()) + min;
double theta = (new Random().nextDouble()) * 2 * Math.PI; double area = Math.PI * (max - min) * (max + min); //of all the area in this donut
double subArea = area * new Random().nextDouble(); //pick a random subset of that area
Double r = Math.sqrt(subArea/Math.PI + min*min); //convert area to radius
double theta = (r - r.intValue()) * 2 * Math.PI; //use the remainder as an angle
// polar to cartesian
x = (int) (r * Math.cos(theta)); x = (int) (r * Math.cos(theta));
z = (int) (r * Math.sin(theta)); z = (int) (r * Math.sin(theta));
x += getCenterX(); x += getCenterX();