C# 实现截图软件功能实例代码

public Bitmap GetScreen() {  //获取整个屏幕图像,不包括任务栏  Rectangle ScreenArea = Screen.GetWorkingArea(this);  Bitmap bmp = new Bitmap(ScreenArea.Width, ScreenArea.Height);  using (Graphics g = Graphics.FromImage(bmp))  {  g.CopyFromScreen(0, 0, 0, 0, new Size(ScreenArea.Width,ScreenArea.Height));  }  return bmp; }

#region 绘制功能 protected override void OnPaint(PaintEventArgs pe) {  base.OnPaint(pe);  Graphics g = pe.Graphics;  DrawHistory(g);  //绘制当前线  if (startDraw && this.curLine.PointList != null && this.curLine.PointList.Count > 0)  {  DrawLine(g,this.curLine);  }  if (startDraw && this.curRect.Start != null && this.curRect.End != null && this.curRect.Start != this.curRect.End) {  DrawRectangle(g, this.curRect);  } } public void DrawHistory(Graphics g) {  //绘制线历史记录  if (LineHistory != null)  {  foreach (HLine lh in LineHistory)  {   if (lh.PointList.Count > 10)   {   DrawLine(g, lh);   }  }  }  //绘制矩形历史记录  if (RectHistory != null)  {  foreach (HRectangle lh in RectHistory)  {   if (lh.Start!=null&& lh.End!=null && lh.Start!=lh.End)   {   DrawRectangle(g, lh);   }  }  } } /// <summary> /// 绘制线 /// </summary> /// <param name="g"></param> /// <param name="line"></param> private void DrawLine(Graphics g,HLine line) {  g.SmoothingMode = SmoothingMode.AntiAlias;  using (Pen p = new Pen(line.LineColor, line.LineWidth))  {  //设置起止点线帽   p.StartCap = LineCap.Round;  p.EndCap = LineCap.Round;  //设置连续两段的联接样式   p.LineJoin = LineJoin.Round;  g.DrawCurve(p, line.PointList.ToArray()); //画平滑曲线   } } /// <summary> /// 绘制矩形 /// </summary> /// <param name="g"></param> /// <param name="rect"></param> private void DrawRectangle(Graphics g, HRectangle rect) {  g.SmoothingMode = SmoothingMode.AntiAlias;  using (Pen p = new Pen(rect.LineColor, rect.LineWidth))  {  //设置起止点线帽   p.StartCap = LineCap.Round;  p.EndCap = LineCap.Round;  //设置连续两段的联接样式   p.LineJoin = LineJoin.Round;  g.DrawRectangle(p, rect.Start.X, rect.Start.Y, rect.End.X - rect.Start.X, rect.End.Y - rect.Start.Y); //画平滑曲线   } } public void Earser(Point p0) {  for (int i = lineHistory.Count - 1; i >= 0; i--)  {  HLine line = lineHistory[i];  bool flag = false;  foreach (Point p1 in line.PointList)  {   double distance = GetDistance(p0, p1);   if (Math.Abs(distance) < 6)   {   //需要删除   flag = true;   break;   }  }  if (flag)  {   lineHistory.RemoveAt(i);  }  }  //擦除矩形  for (int i = rectHistory.Count - 1; i >= 0; i--)  {  HRectangle rect = rectHistory[i];    if (p0.X>rect.Start.X && p0.X<rect.End.X && p0.Y > rect.Start.Y && p0.Y < rect.End.Y) {      rectHistory.RemoveAt(i);  }  } } /// <summary> /// 获取两点之间的距离 /// </summary> /// <param name="p0"></param> /// <param name="p1"></param> /// <returns></returns> private double GetDistance(Point p0, Point p1) {  return Math.Sqrt(Math.Pow((p0.X - p1.X), 2) + Math.Pow((p0.Y - p1.Y), 2)); } #endregion