本文是利用C# 開發截圖軟件的小例子,以供學習分享使用。ide
思路:工具
涉及的知識點:學習
效果圖this
以下【主要實現了截圖,保存,複製,畫矩形,筆觸,熒光筆,橡皮擦等功能】:spa
保存後圖片以下:3d
-------------------------------------------------------------------------------------------------------------------------------code
核心代碼以下:對象
截取屏幕圖像:blog
1 public Bitmap GetScreen() 2 { 3 //獲取整個屏幕圖像,不包括任務欄 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 }
繪製圖形功能:繼承
1 #region 繪製功能 2 3 protected override void OnPaint(PaintEventArgs pe) 4 { 5 base.OnPaint(pe); 6 Graphics g = pe.Graphics; 7 DrawHistory(g); 8 //繪製當前線 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 //繪製線歷史記錄 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 //繪製矩形歷史記錄 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 /// 繪製線 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 //設置起止點線帽 53 p.StartCap = LineCap.Round; 54 p.EndCap = LineCap.Round; 55 56 //設置連續兩段的聯接樣式 57 p.LineJoin = LineJoin.Round; 58 g.DrawCurve(p, line.PointList.ToArray()); //畫平滑曲線 59 } 60 } 61 62 /// <summary> 63 /// 繪製矩形 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 //設置起止點線帽 73 p.StartCap = LineCap.Round; 74 p.EndCap = LineCap.Round; 75 76 //設置連續兩段的聯接樣式 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); //畫平滑曲線 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 //須要刪除 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 /// 獲取兩點之間的距離 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 #endregion
如下是源碼功能鏈接,須要的朋友能夠自行下載。