1 files changed, 91 insertions, 0 deletions
diff --git a/src/fluid_buffer.h b/src/fluid_buffer.h
new file mode 100644
index 0000000..a6c41ba
--- /dev/null
+++ b/src/fluid_buffer.h
@@ -0,0 +1,91 @@
+#pragma once
+
+#include <fstream>
+#include <memory>
+
+#include "vector.h"
+
+using Velocity = Vector<double>;
+using Density  = double;
+
+class FluidBuffer {
+	private:
+		const std::size_t dim_x_;
+		const std::size_t dim_y_;
+
+		std::unique_ptr<Density[]> density_;
+		std::unique_ptr<Velocity[]> velocity_;
+
+	public:
+		FluidBuffer(std::size_t dimX, std::size_t dimY):
+			dim_x_(dimX),
+			dim_y_(dimY),
+			density_(new Density[dimX*dimY]),
+			velocity_(new Velocity[dimX*dimY]) { }
+
+		std::size_t dimX() const {
+			return dim_x_;
+		}
+
+		std::size_t dimY() const {
+			return dim_y_;
+		}
+
+		Density& density(std::size_t x, std::size_t y) {
+			return density_[y*dim_x_ + x];
+		}
+
+		Density& curr(Vector<std::size_t> pos) {
+			return density(pos[0], pos[1]);
+		}
+
+		Velocity& velocity(std::size_t x, std::size_t y) {
+			return velocity_[y*dim_x_ + x];
+		}
+
+		Velocity& velocity(Vector<std::size_t> pos) {
+			return velocity(pos[0], pos[1]);
+		}
+
+		void writeAsVTK(int time) {
+			std::ofstream fout;
+			fout.open(("result/data_t" + std::to_string(time) + ".vtk").c_str());
+
+			fout << "# vtk DataFile Version 3.0\n";
+			fout << "lbm_output\n";
+			fout << "ASCII\n";
+			fout << "DATASET RECTILINEAR_GRID\n";
+			fout << "DIMENSIONS " << dimX() << " " << dimY() << " 1" << "\n";
+
+			fout << "X_COORDINATES " << dimX() << " float\n";
+			for( std::size_t x = 0; x < dimX(); ++x ) {
+				fout << x << " ";
+			}
+
+			fout << "\nY_COORDINATES " << dimY() << " float\n";
+			for( std::size_t y = 0; y < dimY(); ++y ) {
+				fout << y << " ";
+			}
+
+			fout << "\nZ_COORDINATES " << 1 << " float\n";
+			fout << 0 << "\n";
+			fout << "POINT_DATA " << dimX() * dimY() << "\n";
+
+			fout << "VECTORS velocity float\n";
+			for ( std::size_t y = 0; y < dimY(); ++y ) {
+				for ( std::size_t x = 0; x < dimX(); ++x ) {
+					fout << velocity(x,y)[0] << " " << velocity(x,y)[1] << " 0\n";
+				}
+			}
+
+			fout << "SCALARS density float 1\n";
+			fout << "LOOKUP_TABLE default\n";
+			for ( std::size_t y = 0; y < dimY(); ++y ) {
+				for ( std::size_t x = 0; x < dimX(); ++x ) {
+					fout << density(x,y) << "\n";
+				}
+			}
+
+			fout.close();
+		}
+};