63 lines
2.3 KiB
Java
63 lines
2.3 KiB
Java
package com.hypixel.hytale.builtin.hytalegenerator.density.nodes;
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import com.hypixel.hytale.builtin.hytalegenerator.VectorUtil;
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import com.hypixel.hytale.builtin.hytalegenerator.density.Density;
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import com.hypixel.hytale.math.vector.Vector3d;
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import javax.annotation.Nonnull;
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import javax.annotation.Nullable;
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public class GradientDensity extends Density {
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private static final double HALF_PI = Math.PI / 2;
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@Nullable
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private Density input;
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private final double slopeRange;
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@Nonnull
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private final Vector3d axis;
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public GradientDensity(@Nonnull Density input, double slopeRange, @Nonnull Vector3d axis) {
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if (slopeRange <= 0.0) {
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throw new IllegalArgumentException();
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} else {
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this.axis = axis.clone();
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this.slopeRange = slopeRange;
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this.input = input;
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}
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}
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@Override
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public double process(@Nonnull Density.Context context) {
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if (this.input == null) {
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return 0.0;
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} else {
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double valueAtOrigin = this.input.process(context);
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double maxX = context.position.x + this.slopeRange;
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double maxY = context.position.y + this.slopeRange;
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double maxZ = context.position.z + this.slopeRange;
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Density.Context childContext = new Density.Context(context);
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childContext.position = new Vector3d(maxX, context.position.y, context.position.z);
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double deltaX = Math.abs(this.input.process(childContext) - valueAtOrigin);
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childContext.position = new Vector3d(context.position.x, maxY, context.position.z);
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double deltaY = Math.abs(this.input.process(childContext) - valueAtOrigin);
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childContext.position = new Vector3d(context.position.x, context.position.y, maxZ);
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double deltaZ = Math.abs(this.input.process(childContext) - valueAtOrigin);
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Vector3d slopeDirection = new Vector3d(deltaX, deltaY, deltaZ);
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double slopeAngle = VectorUtil.angle(this.axis, slopeDirection);
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if (slopeAngle > Math.PI / 2) {
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slopeAngle = Math.PI - slopeAngle;
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}
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slopeAngle /= Math.PI / 2;
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return slopeAngle * 90.0;
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}
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}
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@Override
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public void setInputs(@Nonnull Density[] inputs) {
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if (inputs.length == 0) {
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this.input = null;
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}
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this.input = inputs[0];
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}
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}
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