pinvoke.net: Edit: gdi32.SetMapMode

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Summary: The SetMapMode API

!!!!C# Signature:
 [DllImport("gdi32.dll")]
 static extern int SetMapMode(IntPtr hdc, int fnMapMode);

!!!!Constants:
 //Mapping Modes
 static int MM_TEXT = 1;
 static int MM_LOMETRIC = 2;
 static int MM_HIMETRIC = 3;
 static int MM_LOENGLISH = 4;
 static int MM_HIENGLISH = 5;
 static int MM_TWIPS = 6;
 static int MM_ISOTROPIC = 7;
 static int MM_ANISOTROPIC = 8;
 
 //Minimum and Maximum Mapping Mode values
 static int MM_MIN = MM_TEXT;
 static int MM_MAX = MM_ANISOTROPIC;
 static int MM_MAX_FIXEDSCALE = MM_TWIPS;

!!!!User-Defined Types:

[MapModes]

!!!!Notes:
None.

!!!!Tips & Tricks:
Please add some!

!!!!Sample Code:

using System;
using System.Runtime.InteropServices; // For calling Windows API functions.

partial class Form1
{
	[DllImport("gdi32.dll")] 
	static extern int SetMapMode(IntPtr hDC, int nMapMode);

[DllImport("gdi32.dll")]
	static extern bool SetViewportOrgEx(IntPtr hDC, int x, int y, Point[] prevPoint);

[DllImport("gdi32.dll")]
	static extern bool SetWindowOrgEx(IntPtr hDC, int x, int y, Point[] prevPoint);

[DllImport("gdi32.dll")]
	static extern bool SetViewportExtEx(IntPtr hDC, int nExtentX, int nExtentY, Size[] prevSize);

[DllImport("gdi32.dll")]
	static extern bool SetWindowExtEx(IntPtr hDC, int nExtentX, int nExtentY, Size[] prevSize);

[DllImport("Gdi32.dll")]
	public static extern int CreatePen(int nPenStyle, int nWidth, int nColor);

[DllImport("Gdi32.dll")]
	public static extern int GetStockObject(int nStockBrush);

[DllImport("Gdi32.dll")]
	public static extern int SelectObject(IntPtr hDC, int hGdiObject);

[DllImport("Gdi32.dll")]
	public static extern int DeleteObject(int hBitmap);

[DllImport("Gdi32.dll")]
	public static extern int MoveToEx(IntPtr hDC, int x, int y, int nPreviousPoint);

[DllImport("Gdi32.dll")]
	public static extern int LineTo(IntPtr hDC, int x, int y);

[DllImport("Gdi32.dll")]
	public static extern int Rectangle(IntPtr hDC, int nLeft, int nTop, int nRight, int nBottom);

[DllImport("Gdi32.dll")]
	public static extern bool DPtoLP(IntPtr hdc, [In, Out] Point[] lpPoints, int nCount);

// Mapping modes.
	const int MM_TEXT = 1; 
	const int MM_LOMETRIC = 2; 
	const int MM_HIMETRIC = 3; 
	const int MM_LOENGLISH = 4;
	const int MM_HIENGLISH = 5;
	const int MM_TWIPS = 6;
	const int MM_ISOTROPIC = 7;
	const int MM_ANISOTROPIC = 8;

// Gdi stock objects.
	const int WHITE_BRUSH = 0;
	const int LTGRAY_BRUSH = 1;
	const int GRAY_BRUSH = 2;
	const int DKGRAY_BRUSH = 3;
	const int BLACK_BRUSH = 4;
	const int NULL_BRUSH = 5;
	const int HOLLOW_BRUSH = NULL_BRUSH;
	const int WHITE_PEN = 6;
	const int BLACK_PEN = 7;
	const int NULL_PEN = 8;
	const int OEM_FIXED_FONT = 10;
	const int ANSI_FIXED_FONT = 11;
	const int ANSI_VAR_FONT = 12;
	const int SYSTEM_FONT = 13;
	const int DEVICE_DEFAULT_FONT = 14;
	const int DEFAULT_PALETTE = 15;
	const int SYSTEM_FIXED_FONT = 16;

// Pen styles.
	const int PS_SOLID = 0;
	const int PS_DASH = 1;
	const int PS_DOT = 2;
	const int PS_DASHDOT = 3;
	const int PS_DASHDOTDOT = 4;
	const int PS_NULL = 5;
	const int PS_INSIDEFRAME = 6;
	const int PS_USERSTYLE = 7;
	const int PS_ALTERNATE = 8;
	const int PS_STYLE_MASK = 0x0000000F;
	const int PS_ENDCAP_ROUND = 0x00000000;
	const int PS_ENDCAP_SQUARE = 0x00000100;
	const int PS_ENDCAP_FLAT = 0x00000200;
	const int PS_ENDCAP_MASK = 0x00000F00;
	const int PS_JOIN_ROUND = 0x00000000;
	const int PS_JOIN_BEVEL = 0x00001000;
	const int PS_JOIN_MITER = 0x00002000;
	const int PS_JOIN_MASK = 0x0000F000;
	const int PS_COSMETIC = 0x00000000;
	const int PS_GEOMETRIC = 0x00010000;
	const int PS_TYPE_MASK = 0x000F0000;

...
         ...
         ...
}

// ______________ Place the following code inside an event handler: ______________________________

Graphics dc = this.CreateGraphics();
Debug.Assert(dc != null);

GraphicsContainer graphicsContainer = dc.BeginContainer();

IntPtr hDC = dc.GetHdc();
Debug.Assert(hDC != null);

Point[] point = new Point[1];
Size[] size = new Size[1];

double fAspectRatio = (double)(this.ClientRectangle.Bottom) / (double)(this.ClientRectangle.Right);

SetMapMode(hDC, MM_ANISOTROPIC);

SetViewportOrgEx(
                 hDC,
                 0,
                 this.ClientRectangle.Bottom,	// So that (0,0) is at the bottom left.
                 point);

SetWindowOrgEx(
               hDC,
               0,
               0,
               point);

SetViewportExtEx(
                 hDC,
                 this.ClientRectangle.Right,
                 -this.ClientRectangle.Bottom, // Negative so that y gets positive as you go up.
                 size);

SetWindowExtEx(
               hDC,
               1000,
               (int)(1000 * fAspectRatio),
               size);

// Create a red pen and select it into the device context.
int hPen = CreatePen(PS_SOLID, 1, 0x000000FF);
int hOldPen = SelectObject(hDC, hPen);

// Draw a line.
MoveToEx(hDC, 10, 25, 0);
LineTo(hDC, 990, (int)(990 * fAspectRatio));

// Create a null brush and select it into the device context.
int hBrush = GetStockObject(NULL_BRUSH);
int hOldBrush = SelectObject(hDC, hBrush);

// Draw a rectangle.
Rectangle(hDC, 10, 25, 990, (int)(990 * fAspectRatio));

// Cleanup.
SelectObject(hDC, hOldPen);
SelectObject(hDC, hOldBrush);
DeleteObject(hPen);
dc.ReleaseHdc();
dc.EndContainer(graphicsContainer);

!!!!Alternative Managed API:
Do you know one?  Please contribute it!

Documentation: SetMapMode@msdn on MSDN