Add geometry handling.

src/geometry/Grid.h

@@ -0,0 +1,56 @@
+#pragma once
+
+#include "Rectangle.h"
+#include <vector>
+
+class Grid
+{
+public:
+
+    Grid(const Rectangle& bounds)
+        : mBounds(bounds)
+    {
+        mValues = std::vector<double>(mNumX*mNumY, 0.0);
+    }
+
+    Rectangle GetBounds() const
+    {
+        return mBounds;
+    }
+
+    double GetXSpacing() const
+    {
+        return mBounds.GetWidth()/double(mNumX);
+    }
+
+    double GetYSpacing() const
+    {
+        return mBounds.GetHeight()/double(mNumY);
+    }
+
+    std::vector<double> GetValues() const
+    {
+        return mValues;
+    }
+
+    void ResetBounds(const Rectangle& bounds)
+    {
+        mBounds = bounds;
+        mValues = std::vector<double>(mNumX*mNumY, 0.0);
+    }
+
+    void SetValues(const std::vector<std::size_t>& indices, double value)
+    {
+        for (auto index : indices)
+        {
+            mValues[index] = value;
+        }
+    }
+
+
+private:
+    Rectangle mBounds;
+    std::vector<double> mValues;
+    unsigned mNumX{5};
+    unsigned mNumY{5};
+};