using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Runtime.InteropServices;
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using System.Text;
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using System.Threading.Tasks;
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using System.Drawing;
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namespace XCommon.Image
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{
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/// <summary>
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/// 像素与物理长度的计算操作类
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/// </summary>
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public class PixelsCalculationHelper
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{
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#region Win32 API
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[DllImport("user32.dll")]
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static extern IntPtr GetDC(IntPtr ptr);
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[DllImport("gdi32.dll")]
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static extern int GetDeviceCaps(
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IntPtr hdc, // handle to DC
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int nIndex // index of capability
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);
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[DllImport("user32.dll", EntryPoint = "ReleaseDC")]
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static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDc);
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#endregion
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#region DeviceCaps常量
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const int HORZRES = 8;//物理屏幕宽度mm
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const int VERTRES = 10;//物理屏幕高度mm
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const int LOGPIXELSX = 88;//逻辑像素x
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const int LOGPIXELSY = 90;//逻辑像素y
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const int DESKTOPVERTRES = 117;//桌面高度
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const int DESKTOPHORZRES = 118;//桌面宽度
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#endregion
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#region 属性
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/// <summary>
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/// 宽度转化 length是毫米，1厘米=10毫米
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/// </summary>
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/// <param name="length"></param>
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/// <returns></returns>
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public static double MillimetersToPixelsWidth(double length)
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{
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System.Drawing.Graphics g = System.Drawing.Graphics.FromHwnd(IntPtr.Zero);
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IntPtr hdc = g.GetHdc();
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int width = GetDeviceCaps(hdc, 4); // HORZRES
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int pixels = GetDeviceCaps(hdc, 8); // BITSPIXEL
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double fg = pixels / width;
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g.ReleaseHdc(hdc);
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return (((double)pixels / (double)width) * (double)length);
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}
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/// <summary>
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/// 高度转化 length是毫米，1厘米=10毫米
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/// </summary>
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/// <param name="length"></param>
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/// <returns></returns>
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public static double MillimetersToPixelsHeight(double length)
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{
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System.Drawing.Graphics g = System.Drawing.Graphics.FromHwnd(IntPtr.Zero);
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IntPtr hdc = g.GetHdc();
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int height = GetDeviceCaps(hdc, 6); // HORZRES
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int pixels = GetDeviceCaps(hdc, 10); // BITSPIXEL
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double fg = pixels / height;
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g.ReleaseHdc(hdc);
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return (((double)pixels / (double)height) * (double)length);
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}
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/// <summary>
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/// 获取屏幕分辨率当前物理大小
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/// </summary>
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public static Size WorkingArea
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{
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get
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{
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IntPtr hdc = GetDC(IntPtr.Zero);
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Size size = new Size();
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size.Width = GetDeviceCaps(hdc, HORZRES);
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size.Height = GetDeviceCaps(hdc, VERTRES);
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ReleaseDC(IntPtr.Zero, hdc);
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return size;
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}
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}
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/// <summary>
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/// 当前系统DPI_X 大小 一般为96
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/// </summary>
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public static int DpiX
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{
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get
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{
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IntPtr hdc = GetDC(IntPtr.Zero);
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int DpiX = GetDeviceCaps(hdc, LOGPIXELSX);
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ReleaseDC(IntPtr.Zero, hdc);
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return DpiX;
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}
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}
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/// <summary>
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/// 当前系统DPI_Y 大小 一般为96
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/// </summary>
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public static int DpiY
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{
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get
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{
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IntPtr hdc = GetDC(IntPtr.Zero);
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int DpiX = GetDeviceCaps(hdc, LOGPIXELSY);
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ReleaseDC(IntPtr.Zero, hdc);
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return DpiX;
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}
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}
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/// <summary>
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/// 获取真实设置的桌面分辨率大小
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/// </summary>
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public static Size DESKTOP
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{
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get
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{
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IntPtr hdc = GetDC(IntPtr.Zero);
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Size size = new Size();
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size.Width = GetDeviceCaps(hdc, DESKTOPHORZRES);
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size.Height = GetDeviceCaps(hdc, DESKTOPVERTRES);
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ReleaseDC(IntPtr.Zero, hdc);
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return size;
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}
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}
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/// <summary>
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/// 获取宽度缩放百分比
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/// </summary>
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public static float ScaleX
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{
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get
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{
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IntPtr hdc = GetDC(IntPtr.Zero);
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int t = GetDeviceCaps(hdc, DESKTOPHORZRES);
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int d = GetDeviceCaps(hdc, HORZRES);
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float ScaleX = (float)GetDeviceCaps(hdc, DESKTOPHORZRES) / (float)GetDeviceCaps(hdc, HORZRES);
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ReleaseDC(IntPtr.Zero, hdc);
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return ScaleX;
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}
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}
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/// <summary>
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/// 获取高度缩放百分比
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/// </summary>
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public static float ScaleY
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{
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get
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{
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IntPtr hdc = GetDC(IntPtr.Zero);
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float ScaleY = (float)(float)GetDeviceCaps(hdc, DESKTOPVERTRES) / (float)GetDeviceCaps(hdc, VERTRES);
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ReleaseDC(IntPtr.Zero, hdc);
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return ScaleY;
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}
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}
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#endregion
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#region 1个像素代表的实际长度
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/// <summary>
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/// 1个像素代表的实际长度
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/// </summary>
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/// <param name="pixels">像素大小</param>
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/// <param name="dpi">每英寸点数</param>
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/// <returns></returns>
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public static double PixelsToInches(int pixels, int dpi)
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{
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return (double)(pixels) / dpi * 25.4;
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}
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#endregion
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}
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}
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