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include/ml/meshlib.hpp

@@ -0,0 +1,86 @@
+#pragma once
+
+#include <iostream>
+#include <ostream>
+#include <memory>
+#include <utility>
+
+#include <Eigen/Eigen>
+
+namespace ml {
+    class MeshBase {
+    public:
+        using PointsType = Eigen::MatrixXf;
+        using CellsType = Eigen::MatrixXi;
+
+        [[nodiscard]] virtual PointsType points() const = 0;
+
+        [[nodiscard]] virtual CellsType cells() const = 0;
+    };
+
+    class DynamicMesh : public MeshBase {
+        PointsType _points;
+        CellsType _cells;
+
+    public:
+        DynamicMesh() = default;
+
+        explicit DynamicMesh(const MeshBase &mesh)
+            : _points(mesh.points()), _cells(mesh.cells()) {}
+
+        DynamicMesh(PointsType points, CellsType cells)
+            : _points(std::move(points)), _cells(std::move(cells)) {}
+
+        [[nodiscard]] PointsType &points() {
+            return _points;
+        }
+
+        [[nodiscard]] PointsType points() const override {
+            return _points;
+        }
+
+        [[nodiscard]] CellsType &cells() {
+            return _cells;
+        }
+
+        [[nodiscard]] CellsType cells() const override {
+            return _cells;
+        }
+    };
+
+    class CubeMesh : public MeshBase {
+        PointsType::Scalar radius;
+
+    public:
+        explicit CubeMesh(PointsType::Scalar radius = 0.5)
+            : radius(radius) {}
+
+        [[nodiscard]] PointsType points() const override {
+            PointsType out(3, 8);
+            out.transpose() <<
+                +radius, +radius, +radius,
+                +radius, +radius, -radius,
+                +radius, -radius, +radius,
+                +radius, -radius, -radius,
+                -radius, +radius, +radius,
+                -radius, +radius, -radius,
+                -radius, -radius, +radius,
+                -radius, -radius, -radius;
+            return out;
+        }
+
+        CellsType cells() const override {
+            CellsType out(3, 12);
+            out.transpose() <<
+                0b000, 0b001, 0b010, 0b001, 0b010, 0b011,
+                0b100, 0b101, 0b110, 0b101, 0b110, 0b111,
+
+                0b000, 0b001, 0b100, 0b001, 0b100, 0b101,
+                0b010, 0b011, 0b110, 0b011, 0b110, 0b111,
+
+                0b000, 0b010, 0b100, 0b010, 0b100, 0b110,
+                0b001, 0b011, 0b101, 0b011, 0b101, 0b111;
+            return out;
+        }
+    };
+}