知识大全 C#中利用GDI作图解决异或问题

Posted 2022-07-21 文字

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　　using System;

　　using System Drawing;

　　using System Collections;

　　using System ComponentModel;

　　using System Windows Forms;

　　using System Data;

　　using System Runtime InteropServices;

　　namespace RubberBands

　　/// <summary>

　　/// Summary description for Form

　　/// </summary>

　　public class RubberBandForm : System Windows Forms Form

　　/// API Declarations

　　private struct POINTAPI

　　public int x;

　　public int y;

　　[DllImport( gdi DLL )]

　　private static extern Int SetROP (IntPtr hDC

　　int nDrawMode);

　　[DllImport( gdi dll )]

　　private static extern bool MoveToEx(IntPtr hDC

　　int x

　　int y

　　POINTAPI lpPoint);

　　[DllImport( gdi dll )]

　　private static extern bool LineTo(IntPtr hDC

　　int x

　　int y);

　　[DllImport( gdi dll )]

　　private static extern IntPtr CreatePen(int nPenStyle

　　int nWidth

　　int crColor);

　　[DllImport( gdi dll )]

　　private static extern IntPtr SelectObject(IntPtr hDC

　　IntPtr hObject);

　　[DllImport( gdi dll )]

　　private static extern bool DeleteObject(IntPtr hObject);

　　private const int R _NOT = ;

　　private const int R _XORPEN = ;

　　private const int PS_DOT = ;

　　/// <summary>

　　/// Required designer variable

　　/// </summary>

　　private System ComponentModel Container ponents = null;

　　private System Drawing Graphics m_oDrawingSurface;

　　private POINTAPI m_ptsStart = new POINTAPI();

　　private POINTAPI m_ptsPrevious;

　　public RubberBandForm()

　　// Required for Windows Form Designer support

　　InitializeComponent();

　　//Add any initialization after the InitializeComponent() call

　　m_oDrawingSurface = this CreateGraphics();

　　/// <summary>

　　/// Clean up any resources being used

　　/// </summary>

　　protected override void Dispose( bool disposing )

　　if( disposing )

　　if (ponents != null)

　　ponents Dispose();

　　base Dispose( disposing );

　　protected override void OnMouseDown(MouseEventArgs e)

　　// Check whether the left mouse button

　　// has generated the associated event

　　if (e Button == MouseButtons Left)

　　// Store the starting point for your rubber band line

　　m_ptsStart x = e X;

　　m_ptsStart y = e Y;

　　// Store the previous end point for your rubber band line

　　m_ptsPrevious = m_ptsStart;

　　base OnMouseDown (e);

　　protected override void OnMouseMove(MouseEventArgs e)

　　// Check if the left mouse button is pressed

　　if( e Button == MouseButtons Left)

　　// Declare local variables

　　// handle to an appropriate device context obtained

　　// from m_oDrawingSurface

　　IntPtr hDC;

　　// previous mix mode; returned from SetROP

　　Int Mix ;

　　// temporary variables used for rubber banding logic

　　POINTAPI ptsCurrent ;

　　POINTAPI ptsOld = new POINTAPI();

　　// determines whether MoveToEx and LineTo calls are successful

　　Boolean Success;

　　// Store the current end point of your rubber band line

　　ptsCurrent x = e X;

　　ptsCurrent y = e Y;

　　// Perform the requisite graphical operations

　　// Obtain a handle to an appropriate device context

　　hDC = m_oDrawingSurface GetHdc();

　　// Set the raster mode to invert the screen color

　　Mix = SetROP (hDC R _NOT);

　　// Move to the starting point of the rubber band line

　　Success = MoveToEx(hDC m_ptsStart x m_ptsStart y ptsOld);

　　// Erase the previous line

　　Success = LineTo(hDC m_ptsPrevious x m_ptsPrevious y);

　　// Move to the starting point of the rubber band line

　　Success = MoveToEx(hDC m_ptsStart x m_ptsStart y ptsOld);

　　// Draw the new line

　　Success = LineTo(hDC ptsCurrent x ptsCurrent y);

　　// Release the obtained handle to a device context

　　m_oDrawingSurface ReleaseHdc(hDC);

　　// Store the current end point for the next erase operation

　　m_ptsPrevious = ptsCurrent;

　　base OnMouseMove (e);

　　#region Windows Form Designer generated code

　　/// <summary>

　　/// Required method for Designer support do not modify

　　/// the contents of this method with the code editor

　　/// </summary>

　　private void InitializeComponent()

　　// RubberBandForm

　　this AutoScaleBaseSize = new System Drawing Size( );

　　this BackColor = System Drawing SystemColors Window;

　　this ClientSize = new System Drawing Size( );

　　this Name = RubberBandForm ;

　　this Text = Using Unmanaged APIs ;

　　#endregion

　　/// <summary>

　　/// The main entry point for the application

　　/// </summary>

　　[STAThread]

　　static void Main()

　　Application Run(new RubberBandForm());

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