// YaoDurant.Drawing.Font.cs - Supports the creation of
// Win32 fonts.
//
// Code from _Programming the .NET Compact Framework with C#_
// and _Programming the .NET Compact Framework with VB_
// (c) Copyright 2002-2004 Paul Yao and David Durant.
// All rights reserved.
using System;
using System.Runtime.InteropServices;
using YaoDurant.Win32;
namespace YaoDurant.Drawing
{
///
/// Summary description for YaoDurant.
///
public class GdiFont
{
[DllImport("coredll.dll")]
public static extern IntPtr CreateFontIndirect (IntPtr lplf);
public const int LF_FACESIZE = 32;
[DllImport("coredll.dll", CharSet=CharSet.Unicode)]
public static extern int GetTextMetrics (IntPtr hdc, ref TEXTMETRIC lptm);
[DllImport("coredll.dll", CharSet=CharSet.Unicode)]
public static extern int GetTextExtentExPoint (IntPtr hdc,
string lpszStr, int cchString, int nMaxExtent, ref int [] lpnFit,
ref int [] alpDx, ref System.Drawing.Size lpSize);
[DllImport("coredll.dll", CharSet=CharSet.Unicode)]
public static extern int GetTextExtentExPoint (IntPtr hdc,
string lpszStr, int cchString, int Res1, int Res2,
int Res3, ref System.Drawing.Size lpSize);
//--------------------------------------------------------
// Create a Font for the display screen
//--------------------------------------------------------
public static IntPtr
Create(
string strFace,
int iSize,
int degrees)
{
// Calculate font height based on this ratio:
//
// Height in Pixels Desired Point Size
// ------------------- = ------------------
// Device Resolution 72
//
// (72 point = approx. 1 inch.)
//
// Which results in the following formula:
//
// Height = (Desired_Pt * Device_Res) / 72
//
IntPtr hdc = GdiGraphics.GetDC(IntPtr.Zero);
IntPtr hfont = Create(strFace, iSize, degrees,hdc);
GdiGraphics.ReleaseDC(IntPtr.Zero, hdc);
return hfont;
}
//--------------------------------------------------------
// Create a Font for a specific device
//--------------------------------------------------------
public static IntPtr
Create(
string strFace,
int iSize,
int degrees,
IntPtr hdc)
{
int cyDevice_Res = GdiGraphics.GetDeviceCaps(hdc, CAPS.LOGPIXELSY);
// Calculate font height.
float flHeight = ((float)iSize * (float)cyDevice_Res) / 72.0F;
int iHeight = (int)(flHeight + 0.5);
// Set height negative to request "Em-Height" (versus
// "character-cell height" for positive size)
iHeight = iHeight * (-1);
// Allocate managed code logfont structure
LOGFONT logfont = new LOGFONT();
logfont.lfHeight = iHeight;
logfont.lfWidth = 0;
logfont.lfEscapement = degrees * 10;
logfont.lfOrientation = 0;
logfont.lfWeight = 0;
logfont.lfItalic = 0;
logfont.lfUnderline= 0;
logfont.lfStrikeOut= 0;
logfont.lfCharSet = 0;
logfont.lfOutPrecision = 0;
logfont.lfClipPrecision = 0;
logfont.lfQuality = 0;
logfont.lfPitchAndFamily = 0;
// Allocate unmanaged code logfont structure.
int cbLogFont = Marshal.SizeOf(logfont);
int cbMem = cbLogFont + LF_FACESIZE;
IntPtr iptrLogFont = NativeHeap.LocalAlloc(NativeHeap.LPTR, cbMem);
if (iptrLogFont == IntPtr.Zero)
return IntPtr.Zero;
// Copy managed structure to unmanaged buffer
Marshal.StructureToPtr(logfont, iptrLogFont, false);
// Set pointer to end of structure
IntPtr ipFaceDest = (IntPtr)((int)iptrLogFont + cbLogFont);
// Copy string to a character array.
char [] achFace = strFace.ToCharArray();
int cch = strFace.Length;
// Copy facename to unmanaged buffer
Marshal.Copy(achFace, 0, ipFaceDest, cch);
return CreateFontIndirect(iptrLogFont);
}
} // class
public struct LOGFONT
{
public int lfHeight;
public int lfWidth;
public int lfEscapement;
public int lfOrientation;
public int lfWeight;
public byte lfItalic;
public byte lfUnderline;
public byte lfStrikeOut;
public byte lfCharSet;
public byte lfOutPrecision;
public byte lfClipPrecision;
public byte lfQuality;
public byte lfPitchAndFamily;
// public TCHAR [] lfFaceName;
};
public struct TEXTMETRIC
{
public int tmHeight;
public int tmAscent;
public int tmDescent;
public int tmInternalLeading;
public int tmExternalLeading;
public int tmAveCharWidth;
public int tmMaxCharWidth;
public int tmWeight;
public int tmOverhang;
public int tmDigitizedAspectX;
public int tmDigitizedAspectY;
public byte tmFirstChar;
public byte tmLastChar;
public byte tmDefaultChar;
public byte tmBreakChar;
public byte tmItalic;
public byte tmUnderlined;
public byte tmStruckOut;
public byte tmPitchAndFamily;
public byte tmCharSet;
};
} // namespace
