实际尺寸之间转换

AIStudio.Wpf.DiagramDesigner/Helpers/ScreenHelper.cs

@@ -1,11 +1,23 @@
-using System;
-using System.Drawing;
+using Microsoft.Win32;
+using System.Collections.Generic;
+using System;
+using System.Management;
 using System.Runtime.InteropServices;
+using System.Drawing;
 
 namespace AIStudio.Wpf.DiagramDesigner
 {
     public static class ScreenHelper
     {
+        public static double ScreenScale;
+        public static double MmToPixelsWidth;
+        static ScreenHelper()
+        {
+            ScreenScale = ResetScreenScale();
+            MmToPixelsWidth = MillimetersToPixelsWidth(1);
+        }
+
+
         [DllImport("user32.dll", EntryPoint = "ReleaseDC")]
         public static extern IntPtr ReleaseDC(
             IntPtr hWnd,
@@ -44,5 +56,94 @@ namespace AIStudio.Wpf.DiagramDesigner
                 return physicalScreenWidth * 1.0000 / System.Windows.SystemParameters.PrimaryScreenWidth;
             }
         }
+
+        //public static List<string> GetMonitorPnpDeviceId()
+        //{
+        //    List<string> rt = new List<string>();
+
+        //    using (ManagementClass mc = new ManagementClass("Win32_DesktopMonitor"))
+        //    {
+        //        using (ManagementObjectCollection moc = mc.GetInstances())
+        //        {
+        //            foreach (var o in moc)
+        //            {
+        //                var each = (ManagementObject)o;
+        //                object obj = each.Properties["PNPDeviceID"].Value;
+        //                if (obj == null)
+        //                    continue;
+
+        //                rt.Add(each.Properties["PNPDeviceID"].Value.ToString());
+        //            }
+        //        }
+        //    }
+
+        //    return rt;
+        //}
+
+        //public static byte[] GetMonitorEdid(string monitorPnpDevId)
+        //{
+        //    return (byte[])Registry.GetValue(@"HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\" + monitorPnpDevId + @"\Device Parameters", "EDID", new byte[] { });
+        //}
+
+        ////获取显示器物理尺寸(cm)
+        //public static SizeF GetMonitorPhysicalSize(string monitorPnpDevId)
+        //{
+        //    byte[] edid = GetMonitorEdid(monitorPnpDevId);
+        //    if (edid.Length < 23)
+        //        return SizeF.Empty;
+
+        //    return new SizeF(edid[21], edid[22]);
+        //}
+
+        //通过屏显示器理尺寸转换为显示器大小(inch)
+        public static float MonitorScaler(SizeF moniPhySize)
+        {
+            double mDSize = Math.Sqrt(Math.Pow(moniPhySize.Width, 2) + Math.Pow(moniPhySize.Height, 2)) / 2.54d;
+            return (float)Math.Round(mDSize, 1);
+        }
+
+        public static double MillimetersToPixelsWidth(double length) //length是毫米，1厘米=10毫米
+        {
+            //System.Windows.Forms.Panel p = new System.Windows.Forms.Panel();
+            System.Drawing.Graphics g = System.Drawing.Graphics.FromHwnd(IntPtr.Zero);
+            IntPtr hdc = g.GetHdc();
+            int width = GetDeviceCaps(hdc, 4);     // HORZRES 
+            int pixels = GetDeviceCaps(hdc, 8);     // BITSPIXEL
+            g.ReleaseHdc(hdc);
+            return (((double)pixels / (double)width) * (double)length);
+        }
+
+     
+        
+        public static double MmToWidth(double length) //length是毫米，1厘米=10毫米
+        {
+            return MmToPixelsWidth * length / ScreenScale;
+        }
+
+        public static double WidthToMm(double length) 
+        {
+            return ScreenScale * length / MmToPixelsWidth;
+        }
+
+        public static double CmToWidth(double length) //length是毫米，1厘米=10毫米
+        {
+            return MmToPixelsWidth * length * 10d/ ScreenScale;
+        }
+
+        public static double WidthToCm(double length)
+        {
+            return ScreenScale * length / (MmToPixelsWidth * 10d);
+        }
+
+        public static double InchToWidth(double length) //length是英寸，1英寸=2.54cm
+        {
+            return MmToPixelsWidth * length * 10d * 2.54d / ScreenScale;
+        }
+
+        public static double WidthToInch(double length) //length是英寸，1英寸=2.54cm
+        {
+            return ScreenScale * length / (MmToPixelsWidth * 10d * 2.54d);
+        }
+
     }
 }