Open source Star Ruler 2 source code!

source/game/util/elevation_map.h

@@ -0,0 +1,44 @@
+#pragma once
+#include "vec2.h"
+#include "vec3.h"
+#include "line3d.h"
+#include <vector>
+
+/*
+ * An elevation map takes an irregularly spaced
+ * set of points, precalculates a regular grid of
+ * smoothly interpolated heights and then allows
+ * for elevation lookup for arbitrary locations.
+ */
+
+class ElevationMap {
+public:
+	struct Point {
+		vec3d center;
+		double radius;
+	};
+	std::vector<Point> points;
+	bool generated;
+	float* grid;
+
+	vec3d gridStart;
+	vec2d gridSize;
+	vec2d gridInterval;
+	vec2i gridResolution;
+	double minHeight;
+	double maxHeight;
+
+	void clear();
+	void addPoint(const vec3d& point, double radius = 0.0);
+	void generate(const vec2d& interval, double power = 2.0);
+
+	double lookup(int x, int y);
+
+	double get(vec2d point);
+	double get(double x, double y);
+
+	bool getClosestPoint(const line3dd& line, vec3d& point);
+
+	ElevationMap();
+	~ElevationMap();
+};