c# – Graphic – DrawLine – 绘制线并移动它

概述在我的.net c#程序中,我使用文本框中的值绘制几行(我使用DrawLine函数).我想要通过clik移动其中的一条,并用鼠标移动这条线 – 是可能吗？ public class LineMover : Form{ public LineMover() { this.DoubleBuffered = true; this.Paint += new PaintEven 在我的.net c#程序中,我使用文本框中的值绘制几行(我使用Drawline函数).我想要通过clik移动其中的一条,并用鼠标移动这条线 – 是可能吗？解决方法

public class lineMover : Form{  public lineMover()  {    this.DoubleBuffered = true;    this.Paint += new PaintEventHandler(lineMover_Paint);    this.MouseMove += new MouseEventHandler(lineMover_MouseMove);    this.MouseDown += new MouseEventHandler(lineMover_MouseDown);    this.MouseUp += new MouseEventHandler(lineMover_MouseUp);    this.lines = new List<Graphline>()    {      new Graphline (10,10,100,200),new Graphline (10,150,120,40),};  }  voID lineMover_MouseUp(object sender,MouseEventArgs e)  {    if (Moving != null)    {      this.Capture = false;      Moving = null;    }    Refreshlineselection(e.Location);  }  voID  lineMover_MouseDown(object sender,MouseEventArgs e)  {    Refreshlineselection(e.Location);    if (this.Selectedline != null && Moving == null)    {      this.Capture = true;      Moving = new MoveInfo        {          line = this.Selectedline,StartlinePoint = Selectedline.StartPoint,EndlinePoint = Selectedline.EndPoint,StartMoveMousePoint = e.Location        };    }    Refreshlineselection(e.Location);  }  voID lineMover_Paint(object sender,PaintEventArgs e)  {    e.Graphics.InterpolationMode = System.Drawing.drawing2d.InterpolationMode.High;    e.Graphics.SmoothingMode = System.Drawing.drawing2d.SmoothingMode.HighQuality;    foreach (var line in lines)    {      var color = line == Selectedline ? color.Red : color.Black;      var pen = new Pen(color,2);      e.Graphics.Drawline(pen,line.StartPoint,line.EndPoint);    }  }  voID lineMover_MouseMove(object sender,MouseEventArgs e)  {    if (Moving != null)    {      Moving.line.StartPoint = new PointF(Moving.StartlinePoint.X + e.X - Moving.StartMoveMousePoint.X,Moving.StartlinePoint.Y + e.Y - Moving.StartMoveMousePoint.Y);      Moving.line.EndPoint = new PointF(Moving.EndlinePoint.X + e.X - Moving.StartMoveMousePoint.X,Moving.EndlinePoint.Y + e.Y - Moving.StartMoveMousePoint.Y);    }    Refreshlineselection(e.Location);  }  private voID Refreshlineselection(Point point)  {    var selectedline = FindlineByPoint(lines,point);    if (selectedline != this.Selectedline)    {      this.Selectedline = selectedline;      this.InvalIDate();    }    if (Moving != null)      this.InvalIDate();    this.Cursor =        Moving != null ? Cursors.Hand :        Selectedline != null ? Cursors.SizeAll :          Cursors.Default;  }  public List<Graphline> lines = new List<Graphline>();  Graphline Selectedline = null;  MoveInfo Moving = null;  static Graphline FindlineByPoint(List<Graphline> lines,Point p)  {    var size = 10;    var buffer = new Bitmap(size * 2,size * 2);    foreach (var line in lines)    {      //draw each line on small region around current point p and check pixel in point p       using (var g = Graphics.FromImage(buffer))      {        g.Clear(color.Black);        g.Drawline(new Pen(color.Green,3),line.StartPoint.X - p.X + size,line.StartPoint.Y - p.Y + size,line.EndPoint.X - p.X + size,line.EndPoint.Y - p.Y + size);      }      if (buffer.GetPixel(size,size).ToArgb() != color.Black.ToArgb())        return line;    }    return null;  }  public static voID Main()  {    Application.Run(new lineMover());  }}public class MoveInfo{  public Graphline line;  public PointF StartlinePoint;  public PointF EndlinePoint;  public Point StartMoveMousePoint;}public class Graphline{  public Graphline(float x1,float y1,float x2,float y2)  {    this.StartPoint = new PointF(x1,y1);    this.EndPoint = new PointF(x2,y2);  }  public PointF StartPoint;  public PointF EndPoint;}

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