80 lines
2.8 KiB
Java
80 lines
2.8 KiB
Java
/*
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*
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* MIT License
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*
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* Copyright (c) 2020 TerraForged
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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package com.terraforged.core.filter;
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import com.terraforged.core.cell.Cell;
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import com.terraforged.core.world.heightmap.Levels;
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import com.terraforged.core.world.terrain.Terrains;
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public class Steepness implements Filter, Filter.Visitor {
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private final int radius;
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private final float scaler;
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private final float waterLevel;
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private final float maxBeachLevel;
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private final Terrains terrains;
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public Steepness(int radius, float scaler, Terrains terrains, Levels levels) {
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this.radius = radius;
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this.scaler = scaler;
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this.terrains = terrains;
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this.waterLevel = levels.water;
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this.maxBeachLevel = levels.water(6);
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}
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@Override
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public void apply(Filterable<?> cellMap, int seedX, int seedZ, int iterations) {
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iterate(cellMap, this);
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}
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@Override
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public void visit(Filterable<?> cellMap, Cell cell, int cx, int cz) {
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float totalHeightDif = 0F;
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for (int dz = -1; dz <= 2; dz++) {
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for (int dx = -1; dx <= 2; dx++) {
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if (dx == 0 && dz == 0) {
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continue;
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}
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int x = cx + dx * radius;
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int z = cz + dz * radius;
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Cell<?> neighbour = cellMap.getCellRaw(x, z);
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if (neighbour.isAbsent()) {
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continue;
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}
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float height = Math.max(neighbour.value, waterLevel);
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totalHeightDif += (Math.abs(cell.value - height) / radius);
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}
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}
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cell.steepness = Math.min(1, totalHeightDif * scaler);
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if (cell.tag == terrains.coast && cell.steepness < 0.225F && cell.value < maxBeachLevel) {
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cell.tag = terrains.beach;
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}
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}
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}
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