1 files changed, 177 insertions, 0 deletions
diff --git a/src/graph/graph.hpp b/src/graph/graph.hpp
new file mode 100644
index 00000000..9ef2e4b8
--- /dev/null
+++ b/src/graph/graph.hpp
@@ -0,0 +1,177 @@
+#pragma once
+
+#include "system_headers.hpp"
+#include <memory>
+
+#include "base.hpp"
+#include "application.hpp"
+
+
+namespace cru::graph
+{
+    class GraphManager;
+
+    //Represents a window render target.
+    class WindowRenderTarget : public Object
+    {
+    public:
+        WindowRenderTarget(GraphManager* graph_manager, HWND hwnd);
+        WindowRenderTarget(const WindowRenderTarget& other) = delete;
+        WindowRenderTarget(WindowRenderTarget&& other) = delete;
+        WindowRenderTarget& operator=(const WindowRenderTarget& other) = delete;
+        WindowRenderTarget& operator=(WindowRenderTarget&& other) = delete;
+        ~WindowRenderTarget() override;
+
+    public:
+        //Get the graph manager that created the render target.
+        GraphManager* GetGraphManager() const
+        {
+            return graph_manager_;
+        }
+
+        //Get the d2d device context.
+        inline Microsoft::WRL::ComPtr<ID2D1DeviceContext> GetD2DDeviceContext() const;
+
+        //Get the target bitmap which can be set as the ID2D1DeviceContext's target.
+        Microsoft::WRL::ComPtr<ID2D1Bitmap1> GetTargetBitmap() const
+        {
+            return target_bitmap_;
+        }
+
+        //Resize the underlying buffer.
+        void ResizeBuffer(int width, int height);
+
+        //Set this render target as the d2d device context's target.
+        void SetAsTarget();
+
+        //Present the data of the underlying buffer to the window.
+        void Present();
+
+    private:
+        void CreateTargetBitmap();
+
+    private:
+        GraphManager* graph_manager_;
+        Microsoft::WRL::ComPtr<IDXGISwapChain1> dxgi_swap_chain_;
+        Microsoft::WRL::ComPtr<ID2D1Bitmap1> target_bitmap_;
+    };
+
+    struct Dpi
+    {
+        float x;
+        float y;
+    };
+
+    class GraphManager : public Object
+    {
+    public:
+        static GraphManager* GetInstance();
+
+    public:
+        GraphManager();
+        GraphManager(const GraphManager& other) = delete;
+        GraphManager(GraphManager&& other) = delete;
+        GraphManager& operator=(const GraphManager& other) = delete;
+        GraphManager& operator=(GraphManager&& other) = delete;
+        ~GraphManager() override;
+
+    public:
+        Microsoft::WRL::ComPtr<ID2D1Factory1> GetD2D1Factory() const
+        {
+            return d2d1_factory_;
+        }
+
+        Microsoft::WRL::ComPtr<ID2D1DeviceContext> GetD2D1DeviceContext() const
+        {
+            return d2d1_device_context_;
+        }
+
+        Microsoft::WRL::ComPtr<ID3D11Device> GetD3D11Device() const
+        {
+            return d3d11_device_;
+        }
+
+        Microsoft::WRL::ComPtr<IDXGIFactory2> GetDxgiFactory() const
+        {
+            return dxgi_factory_;
+        }
+
+        Microsoft::WRL::ComPtr<IDWriteFactory> GetDWriteFactory() const
+        {
+            return dwrite_factory_;
+        }
+
+
+        //Create a window render target with the HWND.
+        std::shared_ptr<WindowRenderTarget> CreateWindowRenderTarget(HWND hwnd);
+
+        //Get the desktop dpi.
+        Dpi GetDpi() const;
+
+        //Reload system metrics including desktop dpi.
+        void ReloadSystemMetrics();
+
+        Microsoft::WRL::ComPtr<IDWriteFontCollection> GetSystemFontCollection() const
+        {
+            return dwrite_system_font_collection_.Get();
+        }
+
+    private:
+        Microsoft::WRL::ComPtr<ID3D11Device> d3d11_device_;
+        Microsoft::WRL::ComPtr<ID3D11DeviceContext> d3d11_device_context_;
+        Microsoft::WRL::ComPtr<ID2D1Factory1> d2d1_factory_;
+        Microsoft::WRL::ComPtr<ID2D1Device> d2d1_device_;
+        Microsoft::WRL::ComPtr<ID2D1DeviceContext> d2d1_device_context_;
+        Microsoft::WRL::ComPtr<IDXGIFactory2> dxgi_factory_;
+
+        Microsoft::WRL::ComPtr<IDWriteFactory> dwrite_factory_;
+        Microsoft::WRL::ComPtr<IDWriteFontCollection> dwrite_system_font_collection_;
+    };
+
+    inline int DipToPixelInternal(const float dip, const float dpi)
+    {
+        return static_cast<int>(dip * dpi / 96.0f);
+    }
+
+    inline int DipToPixelX(const float dip_x)
+    {
+        return DipToPixelInternal(dip_x, Application::GetInstance()->GetGraphManager()->GetDpi().x);
+    }
+
+    inline int DipToPixelY(const float dip_y)
+    {
+        return DipToPixelInternal(dip_y, Application::GetInstance()->GetGraphManager()->GetDpi().y);
+    }
+
+    inline float DipToPixelInternal(const int pixel, const float dpi)
+    {
+        return static_cast<float>(pixel) * 96.0f / dpi;
+    }
+
+    inline float PixelToDipX(const int pixel_x)
+    {
+        return DipToPixelInternal(pixel_x, Application::GetInstance()->GetGraphManager()->GetDpi().x);
+    }
+
+    inline float PixelToDipY(const int pixel_y)
+    {
+        return DipToPixelInternal(pixel_y, Application::GetInstance()->GetGraphManager()->GetDpi().y);
+    }
+
+    Microsoft::WRL::ComPtr<ID2D1DeviceContext> WindowRenderTarget::GetD2DDeviceContext() const
+    {
+        return graph_manager_->GetD2D1DeviceContext();
+    }
+
+    Microsoft::WRL::ComPtr<ID2D1SolidColorBrush> CreateSolidBrush(const D2D1_COLOR_F& color);
+    Microsoft::WRL::ComPtr<IDWriteTextFormat> CreateDefaultTextFormat();
+
+    inline void WithTransform(ID2D1DeviceContext* device_context, const D2D1_MATRIX_3X2_F matrix, const std::function<void(ID2D1DeviceContext*)>& action)
+    {
+        D2D1_MATRIX_3X2_F old_transform;
+        device_context->GetTransform(&old_transform);
+        device_context->SetTransform(old_transform * matrix);
+        action(device_context);
+        device_context->SetTransform(old_transform);
+    }
+}