Add PixelsToEm

pthom · Apr 28, 2024 · bed77bd · bed77bd
1 parent b8b6e68
commit bed77bd
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Showing 2 changed files with 20 additions and 0 deletions.
diff --git a/src/hello_imgui/dpi_aware.h b/src/hello_imgui/dpi_aware.h
@@ -116,6 +116,12 @@ float EmSize();
 float EmSize(float nbLines);
 // @@md
 
+// __HelloImGui::PixelToEm()__ converts a Vec2 in pixels coord to a Vec2 in em units
+ImVec2 PixelsToEm(ImVec2 pixels);
+
+// __HelloImGui::PixelSizeToEm()__ converts a size in pixels coord to a size in em units
+float  PixelSizeToEm(float pixelSize);
+
 } // namespace HelloImGui
 
 

diff --git a/src/hello_imgui/impl/dpi_aware.cpp b/src/hello_imgui/impl/dpi_aware.cpp
@@ -34,6 +34,20 @@ namespace HelloImGui
         return ImVec2(k * v.x, k * v.y);
     }
 
+    ImVec2 PixelsToEm(ImVec2 pixels)
+    {
+        IM_ASSERT(GImGui != NULL);
+        float k = ImGui::GetFontSize();
+        return ImVec2(pixels.x / k, pixels.y / k);
+    }
+
+    float  PixelSizeToEm(float pixelSize)
+    {
+        IM_ASSERT(GImGui != NULL);
+        float k = ImGui::GetFontSize();
+        return pixelSize / k;
+    }
+
 
     float DpiWindowSizeFactor()
     {