思绪:
截取屏幕图片。
猎取要截取的局限,即左上角,右下角坐标
填充到PictureBox中。
笔触功用,荧光笔,矩形,橡皮擦,复制,保留功用
触及的知识点:
MenuStrip:为窗体供应菜单体系。以ToolStripMenuItem为菜票据选项
ToolStrip:为 Windows 工具栏对象供应容器。以ToolStripButton【示意包含文本和图象的可选】为工具栏子元素
PictureBox:示意用于显现图象的 Windows 图片框控件。不过本文对此空间进行了重写
Screen:可用于猎取事情屏幕地区
Graphics:封装一个 GDI+ 画图图面。此类不能被继续。此类的CopyFromScreen要领用于猎取屏幕图象
鼠标事宜:包含MouseDown,MouseMove,MouseUp事宜,经由过程MouseEventArgs中的Location猎取鼠标的位置。
Clipboard: 供应将数据置于体系剪贴板中以及从中检索数据的要领。此类不能被继续。
Cursor:设置鼠标的显现的光标的款式。
OnPaint:重绘事宜,当控件革新时相应此事宜。
效果图以下【重要完成了截图,保留,复制,画矩形,笔触,荧光笔,橡皮擦等功用】:
保留后图片以下:
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中心代码以下:
截取屏幕图象:
1 public Bitmap GetScreen() 2 { 3 //猎取全部屏幕图象,不包含任务栏 4 Rectangle ScreenArea = Screen.GetWorkingArea(this); 5 Bitmap bmp = new Bitmap(ScreenArea.Width, ScreenArea.Height); 6 using (Graphics g = Graphics.FromImage(bmp)) 7 { 8 g.CopyFromScreen(0, 0, 0, 0, new Size(ScreenArea.Width,ScreenArea.Height)); 9 }10 return bmp;11 }View Code
绘制图形功用:
1 #region 绘制功用 2 3 protected override void OnPaint(PaintEventArgs pe) 4 { 5 base.OnPaint(pe); 6 Graphics g = pe.Graphics; 7 DrawHistory(g); 8 //绘制当前哨 9 if (startDraw && this.curLine.PointList != null && this.curLine.PointList.Count > 0) 10 { 11 DrawLine(g,this.curLine); 12 } 13 if (startDraw && this.curRect.Start != null && this.curRect.End != null && this.curRect.Start != this.curRect.End) { 14 DrawRectangle(g, this.curRect); 15 } 16 } 17 18 public void DrawHistory(Graphics g) { 19 //绘制线历史记录 20 if (LineHistory != null) 21 { 22 foreach (HLine lh in LineHistory) 23 { 24 if (lh.PointList.Count > 10) 25 { 26 DrawLine(g, lh); 27 } 28 } 29 } 30 //绘制矩形历史记录 31 if (RectHistory != null) 32 { 33 foreach (HRectangle lh in RectHistory) 34 { 35 if (lh.Start!=null&& lh.End!=null && lh.Start!=lh.End) 36 { 37 DrawRectangle(g, lh); 38 } 39 } 40 } 41 } 42 43 /// <summary> 44 /// 绘制线 45 /// </summary> 46 /// <param name="g"></param> 47 /// <param name="line"></param> 48 private void DrawLine(Graphics g,HLine line) { 49 g.SmoothingMode = SmoothingMode.AntiAlias; 50 using (Pen p = new Pen(line.LineColor, line.LineWidth)) 51 { 52 //设置起止点线帽 53 p.StartCap = LineCap.Round; 54 p.EndCap = LineCap.Round; 55 56 //设置一连两段的连接款式 57 p.LineJoin = LineJoin.Round; 58 g.DrawCurve(p, line.PointList.ToArray()); //画腻滑曲线 59 } 60 } 61 62 /// <summary> 63 /// 绘制矩形 64 /// </summary> 65 /// <param name="g"></param> 66 /// <param name="rect"></param> 67 private void DrawRectangle(Graphics g, HRectangle rect) 68 { 69 g.SmoothingMode = SmoothingMode.AntiAlias; 70 using (Pen p = new Pen(rect.LineColor, rect.LineWidth)) 71 { 72 //设置起止点线帽 73 p.StartCap = LineCap.Round; 74 p.EndCap = LineCap.Round; 75 76 //设置一连两段的连接款式 77 p.LineJoin = LineJoin.Round; 78 g.DrawRectangle(p, rect.Start.X, rect.Start.Y, rect.End.X - rect.Start.X, rect.End.Y - rect.Start.Y); //画腻滑曲线 79 } 80 } 81 82 public void Earser(Point p0) 83 { 84 for (int i = lineHistory.Count - 1; i >= 0; i--) 85 { 86 HLine line = lineHistory[i]; 87 bool flag = false; 88 foreach (Point p1 in line.PointList) 89 { 90 double distance = GetDistance(p0, p1); 91 if (Math.Abs(distance) < 6) 92 { 93 //须要删除 94 flag = true; 95 break; 96 } 97 98 } 99 if (flag)100 {101 lineHistory.RemoveAt(i);102 }103 }104 //擦除矩形105 for (int i = rectHistory.Count - 1; i >= 0; i--)106 {107 HRectangle rect = rectHistory[i];108 109 if (p0.X>rect.Start.X && p0.X<rect.End.X && p0.Y > rect.Start.Y && p0.Y < rect.End.Y) {110 111 rectHistory.RemoveAt(i);112 }113 }114 }115 116 /// <summary>117 /// 猎取两点之间的间隔118 /// </summary>119 /// <param name="p0"></param>120 /// <param name="p1"></param>121 /// <returns></returns>122 private double GetDistance(Point p0, Point p1) {123 return Math.Sqrt(Math.Pow((p0.X - p1.X), 2) + Math.Pow((p0.Y - p1.Y), 2));124 }125 126 #endregionView Code
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