feat(game.world): shape utils

src/main/java/org/auioc/mcmod/arnicalib/game/world/phys/ShapeUtils.java

@@ -0,0 +1,48 @@
+package org.auioc.mcmod.arnicalib.game.world.phys;
+
+import net.minecraft.util.Mth;
+import net.minecraft.world.phys.Vec3;
+
+public class ShapeUtils {
+
+    public static Vec3[] getPointsOnLine(Vec3 start, Vec3 end, double stepLength) {
+        double dX = (end.x - start.x);
+        double dY = (end.y - start.y);
+        double dZ = (end.z - start.z);
+
+        double lineLength = Mth.length(dX, dY, dZ);
+
+        int pointCount = (int) (lineLength / stepLength);
+        var points = new Vec3[pointCount];
+
+        double stepLengthX = dX / pointCount;
+        double stepLengthY = dY / pointCount;
+        double stepLengthZ = dZ / pointCount;
+        for (int i = 0; i < pointCount; i++) {
+            double x = start.x + stepLengthX * i;
+            double y = start.y + stepLengthY * i;
+            double z = start.z + stepLengthZ * i;
+            points[i] = new Vec3(x, y, z);
+        }
+
+        return points;
+    }
+
+    public static Vec3[] createRegularPolygon(Vec3 centre, Vec3 normalVector, double circumradius, double centralAngle) {
+        var base = VectorUtils.getBaseVector(normalVector);
+
+        int pointCount = (int) (360.0D / centralAngle);
+        var vertexes = new Vec3[pointCount];
+        for (int i = 0; i < pointCount; ++i) {
+            double t = Math.toRadians(i * centralAngle);
+            double sinT = Math.sin(t);
+            double cosT = Math.cos(t);
+            vertexes[i] = centre
+                .add(VectorUtils.multiply(VectorUtils.multiply(base.getLeft(), circumradius), cosT))
+                .add(VectorUtils.multiply(VectorUtils.multiply(base.getRight(), circumradius), sinT));
+        }
+
+        return vertexes;
+    }
+
+}