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1 files changed, 63 insertions, 0 deletions

diff --git a/src/graph/graph_util.hpp b/src/graph/graph_util.hpp
new file mode 100644
index 00000000..2d5be5f3
--- /dev/null
+++ b/src/graph/graph_util.hpp
@@ -0,0 +1,63 @@
+#pragma once
+#include "pre.hpp"
+
+#include <d2d1_1.h>
+#include <functional>
+
+#include "exception.hpp"
+#include "graph_manager.hpp"
+
+namespace cru::graph {
+struct Dpi {
+  float x;
+  float y;
+};
+
+inline Dpi GetDpi() {
+  Dpi dpi;
+  GraphManager::GetInstance()->GetD2D1Factory()->GetDesktopDpi(&dpi.x, &dpi.y);
+  return dpi;
+}
+
+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, GetDpi().x);
+}
+
+inline int DipToPixelY(const float dip_y) {
+  return DipToPixelInternal(dip_y, 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, GetDpi().x);
+}
+
+inline float PixelToDipY(const int pixel_y) {
+  return DipToPixelInternal(pixel_y, GetDpi().y);
+}
+
+inline void WithTransform(
+    ID2D1RenderTarget* render_target, const D2D1_MATRIX_3X2_F matrix,
+    const std::function<void(ID2D1RenderTarget*)>& action) {
+  D2D1_MATRIX_3X2_F old_transform;
+  render_target->GetTransform(&old_transform);
+  render_target->SetTransform(old_transform * matrix);
+  action(render_target);
+  render_target->SetTransform(old_transform);
+}
+
+inline ID2D1SolidColorBrush* CreateSolidColorBrush(const D2D1_COLOR_F& color) {
+  ID2D1SolidColorBrush* brush;
+  ThrowIfFailed(GraphManager::GetInstance()
+                    ->GetD2D1DeviceContext()
+                    ->CreateSolidColorBrush(color, &brush));
+  return brush;
+}
+}  // namespace cru::graph