Differential D1615 Diff 6863 binaries/data/mods/public/maps/random/rmgen/painter/DunePainter.js

Changeset View

Standalone View

binaries/data/mods/public/maps/random/rmgen/painter/DunePainter.js

				/*
				*@param {Bool} type - ELEVATION_MODIFY or ELEVATION_SET
				*@param {Number} scale - global scale of dune size (width and height) - higher values make dunes bigger
				*@param {Number} vertical_scale - scale of dune height - higher makes dunes taller
				*/
				function DunePainter(type = ELEVATION_MODIFY, scale = 1, vertical_scale = 1)
				{
				this.type = type;
				this.scale = scale;
				this.vertical_scale = vertical_scale;
				}
				/*
				*Dune base shape
				*@param {Number} - x [0,1] value
				*@param {Number} - xm [0,1] position of the dune crest
				*@param {Bool} - d true for dune false for dome
				*/
				DunePainter.prototype.dune = function(x, crest_x = 0.75, dune = true)
				{
				if (x < crest_x)
				{
				return (1 - Math.cos(Math.PI * x / crest_x)) * 0.5;
				}
				else
				{
				if (dune)
				{
				return (1 - Math.cos(Math.PI * (x - 1) / (crest_x - 1))) * 0.5;
				}
				else
				{
				return 1 - Math.cos(Math.PI * (x - 1) / (crest_x - 1) * 0.5);
				}
				}
				}

				DunePainter.prototype.paint = function(area)
				{
				const points = area.getPoints();
				const length = points.length;
				//1st dune layer
				const h1_1 = perlin_noise(points, 6, 2, 1, 1.1, true);
				const h1_2 = perlin_noise(points, 3, 2, 1, 1, true);
				const L1 = 17.0 * this.scale;
				//2on dune layer
				const h2_1 = perlin_noise(points, 8, 1, 2, 2, true);
				const h2_2 = perlin_noise(points, 4, 2, 2, 2, true);
				const L2 = 14.0 * this.scale;
				//loop all the points
				let elevation_type = this.type ? (i) => g_Map.getHeight(points[i]) : () => 0;
				for (var i = 0; i < length; i++)
				{
				const X = points[i].x;
				const Y = points[i].y;
				//main dunes creation
				const v1 = ((X + h1_1[i] * 13 + Y * 0.1) % L1) / L1;
				const h1 = this.dune(v1, 0.60, false) * 9 * 0.9 + h1_1[i] * h1_2[i] * 150 * 0.1;
				//secondary dunes
				const v2 = ((X + h2_1[i] * 13 + Y * 0.1) % L2) / L2;
				const h2 = this.dune(v2, 0.60, false) * 9 * 0.9 + h2_2[i] * 50 * 0.1;
				const height = (h1 * 0.8 + h2 * 0.2) * this.vertical_scale * this.scale;
				//add or set height
				g_Map.setHeight(points[i], height + elevation_type(i));
				}
				}
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