Flowchart

2026-04-08 10:16:36 +08:00 · 2022-12-04 23:07:20 +08:00
parent dc42f75610
commit 0487857d7b
30 changed files with 1621 additions and 383 deletions
--- a/AIStudio.Wpf.DiagramDesigner/Helpers/ScreenHelper.cs
+++ b/AIStudio.Wpf.DiagramDesigner/Helpers/ScreenHelper.cs
@@ -0,0 +1,48 @@
+using System;
+using System.Drawing;
+using System.Runtime.InteropServices;
+
+namespace AIStudio.Wpf.DiagramDesigner
+{
+    public static class ScreenHelper
+    {
+        [DllImport("user32.dll", EntryPoint = "ReleaseDC")]
+        public static extern IntPtr ReleaseDC(
+            IntPtr hWnd,
+            IntPtr hDc
+            );
+
+        [DllImport("gdi32.dll")]
+        public static extern int GetDeviceCaps(
+            IntPtr hdc, // handle to DC
+            int nIndex // index of capability
+            );
+
+        public static System.Drawing.Size GetPhysicalDisplaySize()
+        {
+            Graphics g = Graphics.FromHwnd(IntPtr.Zero);
+            IntPtr desktop = g.GetHdc();
+            int physicalScreenHeight = GetDeviceCaps(desktop, (int)DeviceCap.Desktopvertres);
+            int physicalScreenWidth = GetDeviceCaps(desktop, (int)DeviceCap.Desktophorzres);
+            ReleaseDC(IntPtr.Zero, desktop);
+            g.Dispose();
+            return new System.Drawing.Size(physicalScreenWidth, physicalScreenHeight);
+        }
+
+        public enum DeviceCap
+        {
+            Desktopvertres = 117,
+            Desktophorzres = 118
+        }
+
+        public static double ResetScreenScale()
+        {
+            using (var g = Graphics.FromHwnd(IntPtr.Zero))
+            {
+                IntPtr desktop = g.GetHdc();
+                int physicalScreenWidth = GetDeviceCaps(desktop, (int)DeviceCap.Desktophorzres);
+                return physicalScreenWidth * 1.0000 / System.Windows.SystemParameters.PrimaryScreenWidth;
+            }
+        }
+    }
+}