1 files changed, 75 insertions, 0 deletions
diff --git a/src/fluid_buffer.cc b/src/fluid_buffer.cc
new file mode 100644
index 0000000..e73c818
--- /dev/null
+++ b/src/fluid_buffer.cc
@@ -0,0 +1,75 @@
+#include "fluid_buffer.h"
+
+#include <fstream>
+
+FluidBuffer::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 FluidBuffer::dimX() const {
+	return dim_x_;
+}
+
+std::size_t FluidBuffer::dimY() const {
+	return dim_y_;
+}
+
+Density& FluidBuffer::density(std::size_t x, std::size_t y) {
+	return density_[y*dim_x_ + x];
+}
+
+Density& FluidBuffer::density(Vector<std::size_t> pos) {
+	return density(pos[0], pos[1]);
+}
+
+Velocity& FluidBuffer::velocity(std::size_t x, std::size_t y) {
+	return velocity_[y*dim_x_ + x];
+}
+
+Velocity& FluidBuffer::velocity(Vector<std::size_t> pos) {
+	return velocity(pos[0], pos[1]);
+}
+
+void FluidBuffer::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();
+}