C#截取屏幕中選定區域的圖像
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http://blog.csdn.net/manimanihome/article/details/2071517
C#截取屏幕中選定區域的圖像
原理:主窗體首先截取整個屏幕圖像作為主窗體的背景圖,並且最大化,然後再做一個可調整大小的半透明窗體,將該窗體顯示在主窗體上,那麼該窗體所在的方框就是所要截取的方框.調整該窗体也就可以調整截取的范圍.
1.主窗體的設計
相關屬性:
this.TopMost = true;
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
--1.截取整個屏幕圖像
private Bitmap GetScreenImage() { Bitmap bmp = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height); Graphics g = Graphics.FromImage(bmp); g.CopyFromScreen(0, 0, 0, 0, Screen.PrimaryScreen.Bounds.Size); g.Dispose(); return bmp; }--2.畫方框
private void FormBack_MouseMove(object sender, MouseEventArgs e) { if (!this.catcher.Visible) { this.label_CatcherLoc.Text = "位置 X: " + e.X + ", Y: " + e.Y; } if (this.isMouseLeftDown) { Rectangle rect = new Rectangle(); rect.X = e.X > this.catcherLoc.X ? this.catcherLoc.X : e.X; rect.Y = e.Y > this.catcherLoc.Y ? this.catcherLoc.Y : e.Y; rect.Width = Math.Abs(e.X - this.catcherLoc.X); rect.Height = Math.Abs(e.Y - this.catcherLoc.Y); this.catcher.Bounds = rect; if (!this.catcher.Visible) { this.catcher.Show(this); } } }--3.取消繪製或退出:
private void FormBack_MouseDown(object sender, MouseEventArgs e) { if (e.Button == MouseButtons.Right) { if (!this.catcher.Visible) { Application.Exit(); } else { this.catcher.Visible = false; this.catcherLoc = Point.Empty; this.isMouseLeftDown = false; } } else if (e.Button == MouseButtons.Left) { if (!this.catcher.Visible) { this.catcherLoc = e.Location; this.isMouseLeftDown = true; } } }--4.調整顯示面板
如果改成(左上-->右上-->右下-->左下),代碼也不難,效果應該更好.
private void panel_Info_MouseEnter(object sender, EventArgs e) { Panel pl = (Panel)sender; if (pl.Right < this.Width / 2)//在左邊 { pl.Location = new Point(this.Width - pl.Width - 20, pl.Location.Y); } else { pl.Location = new Point(10, 10); } }--5.複製:
還可以繼續添加一個右鍵菜單,擴展成更多的保存方式.
void catcher_DoubleClick(object sender, EventArgs e) { Bitmap bmpCatched = new Bitmap(this.catcher.Width, this.catcher.Height); Graphics g = Graphics.FromImage(bmpCatched); g.CopyFromScreen(this.catcher.Location, new Point(0, 0), this.catcher.ClientRectangle.Size); Clipboard.SetImage(bmpCatched); if (MessageBox.Show("已經復制導剪切板") == DialogResult.OK) { Application.Exit(); } }2.製作一個可調整大小的半透明的無標題欄窗體.
在該窗體中應盡量實現應有的功能.
設置相關屬性:
this.Cursor = System.Windows.Forms.Cursors.SizeAll;
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
this.ShowInTaskbar = false;
--1.繪製邊線及小方塊
//繪制矩形邊框與8個小方塊 private void FormCatcher_Paint(object sender, PaintEventArgs e) { using (Graphics g = e.Graphics) { Rectangle rect = new Rectangle(2, 2, this.ClientRectangle.Width-4, this.ClientRectangle.Height-4); g.DrawRectangle(Pens.Red, rect); //繪制小方塊,只要有邊線,不畫方塊,也可以調整大小 for (int i = 0; i <= 7; i++) { g.FillRectangle(Brushes.Red, this.GetBoundsOfSmallBlock(i)); } } }--2.調整窗體大小及移動窗体
//注意:調得太快時,鼠標好像跑得太快,有點不同步的感覺. private void FormCatcher_MouseMove(object sender, MouseEventArgs e) { int d = 10; if (e.X < d)//左邊緣 { if (e.Y < d)//左上 { this.Cursor = Cursors.SizeNWSE; if (this.isMouseLeftDown) { this.Location = new Point(Cursor.Position.X, Cursor.Position.Y); this.Width = Math.Abs(Cursor.Position.X - this.bottomLoc.X); this.Height = Math.Abs(Cursor.Position.Y - this.bottomLoc.Y); } } else if (Math.Abs(e.Y - this.Height) < d)//左下 { this.Cursor = Cursors.SizeNESW; if (this.isMouseLeftDown) { this.Location = new Point(Cursor.Position.X,this.Location.Y); this.Width = Math.Abs(Cursor.Position.X - this.bottomLoc.X); this.Height = Math.Abs(Cursor.Position.Y - this.Location.Y); } } else//左 { this.Cursor = Cursors.SizeWE; if (this.isMouseLeftDown) { this.Location = new Point(Cursor.Position.X, this.Location.Y); this.Width = Math.Abs(Cursor.Position.X - this.bottomLoc.X); } } } else if (Math.Abs(e.X - this.Width) < d)//右邊緣 { if (e.Y < d)//右上 { this.Cursor = Cursors.SizeNESW; if (this.isMouseLeftDown) { this.Location = new Point(this.Location.X, Cursor.Position.Y); this.Width = Math.Abs(Cursor.Position.X - this.Location.X); this.Height = Math.Abs(Cursor.Position.Y - this.bottomLoc.Y); } } else if (Math.Abs(e.Y - this.Height) < d)//右下 { this.Cursor = Cursors.SizeNWSE; if (this.isMouseLeftDown) { this.Height = Cursor.Position.Y - this.Location.Y; this.Width = Cursor.Position.X - this.Location.X; } } else//右 { this.Cursor = Cursors.SizeWE; if (this.isMouseLeftDown) { this.Width = Cursor.Position.X - this.Location.X; } } } else { if (e.Y < d)//上邊緣 { this.Cursor = Cursors.SizeNS;//中上 if (this.isMouseLeftDown) { this.Location = new Point(this.Location.X,Cursor.Position.Y); this.Height = Math.Abs(Cursor.Position.Y - this.bottomLoc.Y); } } else if (Math.Abs(e.Y - this.Height) < d)//下邊緣 { this.Cursor = Cursors.SizeNS;//中下 if (this.isMouseLeftDown) { this.Height = Cursor.Position.Y - this.Location.Y; } } else//非邊緣區域 { this.Cursor = Cursors.SizeAll; if (this.isMouseLeftDown) {//按下鼠標左鍵並拖動窗口,改變窗口位置 this.Location = new Point(Cursor.Position.X - this.dxCursorToWindow, Cursor.Position.Y - this.dyCursorToWindow); } } } }3.附源碼
源碼1:
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Drawing.Drawing2D;using System.Text;using System.Windows.Forms;namespace QQCatchScreen{ public partial class FormCatcher : Form { public FormCatcher() { InitializeComponent(); this.Paint += new System.Windows.Forms.PaintEventHandler(this.FormCatcher_Paint); this.Resize += new EventHandler(FormCatcher_Resize); this.MouseUp += new System.Windows.Forms.MouseEventHandler(this.FormCatcher_MouseUp); this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.FormCatcher_MouseDown); this.MouseMove += new System.Windows.Forms.MouseEventHandler(this.FormCatcher_MouseMove); } private bool isMouseLeftDown = false; /// <summary> /// 鼠標按下時鼠標與窗體位置橫坐標差 /// </summary> private int dxCursorToWindow = 0; /// <summary> /// 鼠標按下時鼠標與窗體位置縱坐標差 /// </summary> private int dyCursorToWindow = 0; /// <summary> /// 窗體右下角的座標 /// </summary> private Point bottomLoc = Point.Empty; void FormCatcher_Resize(object sender, EventArgs e) { this.Refresh(); } //繪制矩形邊框與8個小方塊 private void FormCatcher_Paint(object sender, PaintEventArgs e) { using (Graphics g = e.Graphics) { Rectangle rect = new Rectangle(2, 2, this.ClientRectangle.Width-4, this.ClientRectangle.Height-4); g.DrawRectangle(Pens.Red, rect); //繪制小方塊,只要有邊線,不畫方塊,也可以調整大小 for (int i = 0; i <= 7; i++) { g.FillRectangle(Brushes.Red, this.GetBoundsOfSmallBlock(i)); } } } /// <summary> /// 獲取指定序號的小方塊的位置 /// </summary> /// <param name="index"></param> /// <returns></returns> private Rectangle GetBoundsOfSmallBlock(int index) { int x = 0; int y = 0; int w = 4; int h = 4; switch (index) { case 0: case 3: case 5: x = 0; break; case 1: case 6: x = this.ClientRectangle.Width / 2 -3;// break; case 2: case 4: case 7: x = this.ClientRectangle.Width-4;// break; default: throw new IndexOutOfRangeException("小方塊序號錯誤，應該在?0，?"); } switch (index) { case 0: case 1: case 2: y = 0; break; case 3: case 4: y = this.ClientRectangle.Height / 2 -3;// break; case 5: case 6: case 7: y = this.ClientRectangle.Height-4;// break; default: throw new IndexOutOfRangeException("小方塊序號錯誤，應該在?0，?"); } return new Rectangle(x, y, w, h); } private void FormCatcher_MouseDown(object sender, MouseEventArgs e) { if (e.Button == MouseButtons.Left) { this.isMouseLeftDown = true; this.dxCursorToWindow = Cursor.Position.X - this.Location.X; this.dyCursorToWindow = Cursor.Position.Y - this.Location.Y; this.bottomLoc = new Point(this.Location.X + this.Width, this.Location.Y + this.Height); } } private void FormCatcher_MouseUp(object sender, MouseEventArgs e) { if (e.Button == MouseButtons.Left) { this.isMouseLeftDown = false; this.dxCursorToWindow = this.dyCursorToWindow = 0; this.bottomLoc = new Point(this.Location.X + this.Width, this.Location.Y + this.Height); } } //調整大小就在這裡實現 //Bug:調得太快時,效果不好. private void FormCatcher_MouseMove(object sender, MouseEventArgs e) { int d = 10; if (e.X < d)//左邊緣 { if (e.Y < d)//左上 { this.Cursor = Cursors.SizeNWSE; if (this.isMouseLeftDown) { this.Location = new Point(Cursor.Position.X, Cursor.Position.Y); this.Width = Math.Abs(Cursor.Position.X - this.bottomLoc.X); this.Height = Math.Abs(Cursor.Position.Y - this.bottomLoc.Y); } } else if (Math.Abs(e.Y - this.Height) < d)//左下 { this.Cursor = Cursors.SizeNESW; if (this.isMouseLeftDown) { this.Location = new Point(Cursor.Position.X,this.Location.Y); this.Width = Math.Abs(Cursor.Position.X - this.bottomLoc.X); this.Height = Math.Abs(Cursor.Position.Y - this.Location.Y); } } else//左 { this.Cursor = Cursors.SizeWE; if (this.isMouseLeftDown) { this.Location = new Point(Cursor.Position.X, this.Location.Y); this.Width = Math.Abs(Cursor.Position.X - this.bottomLoc.X); } } } else if (Math.Abs(e.X - this.Width) < d)//右邊緣 { if (e.Y < d)//右上 { this.Cursor = Cursors.SizeNESW; if (this.isMouseLeftDown) { this.Location = new Point(this.Location.X, Cursor.Position.Y); this.Width = Math.Abs(Cursor.Position.X - this.Location.X); this.Height = Math.Abs(Cursor.Position.Y - this.bottomLoc.Y); } } else if (Math.Abs(e.Y - this.Height) < d)//右下 { this.Cursor = Cursors.SizeNWSE; if (this.isMouseLeftDown) { this.Height = Cursor.Position.Y - this.Location.Y; this.Width = Cursor.Position.X - this.Location.X; } } else//右 { this.Cursor = Cursors.SizeWE; if (this.isMouseLeftDown) { this.Width = Cursor.Position.X - this.Location.X; } } } else { if (e.Y < d)//上邊緣 { this.Cursor = Cursors.SizeNS;//中上 if (this.isMouseLeftDown) { this.Location = new Point(this.Location.X,Cursor.Position.Y); this.Height = Math.Abs(Cursor.Position.Y - this.bottomLoc.Y); } } else if (Math.Abs(e.Y - this.Height) < d)//下邊緣 { this.Cursor = Cursors.SizeNS;//中下 if (this.isMouseLeftDown) { this.Height = Cursor.Position.Y - this.Location.Y; } } else//非邊緣區域 { this.Cursor = Cursors.SizeAll; if (this.isMouseLeftDown) {//按下鼠標左鍵並拖動窗口,改變窗口位置 this.Location = new Point(Cursor.Position.X - this.dxCursorToWindow, Cursor.Position.Y - this.dyCursorToWindow); } } } } }}源碼2:
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Drawing.Drawing2D;using System.Text;using System.Windows.Forms;namespace QQCatchScreen{ public partial class FormBack : Form { /// <summary> /// 保存整個屏幕的圖像 /// </summary> private Bitmap screenImage = null; /// <summary> /// 用於確定最終捕獲圖像的窗口 /// </summary> private FormCatcher catcher = new FormCatcher(); /// <summary> /// 用於記錄catcher的位置 /// </summary> private Point catcherLoc = Point.Empty; /// <summary> /// 標記鼠標左鍵是否按下 /// </summary> private bool isMouseLeftDown = false; public FormBack() { InitializeComponent(); this.MouseUp += new System.Windows.Forms.MouseEventHandler(this.FormBack_MouseUp); this.MouseMove += new System.Windows.Forms.MouseEventHandler(this.FormBack_MouseMove); this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.FormBack_MouseDown); this.Load += new System.EventHandler(this.FormBack_Load); } private void FormBack_Load(object sender, EventArgs e) { this.Cursor = new Cursor("cur.cur"); //設置位置和背景 this.Bounds = Screen.PrimaryScreen.Bounds; this.screenImage = this.GetScreenImage(); this.BackgroundImage = this.screenImage; //加載捕獲窗口 this.catcher.Opacity = 0.4; this.catcher.Visible = false; this.catcher.MouseDown += new MouseEventHandler(catcher_MouseDown); this.catcher.DoubleClick += new EventHandler(catcher_DoubleClick); this.catcher.SizeChanged += new EventHandler(catcher_SizeChanged); this.catcher.VisibleChanged += new EventHandler(catcher_VisibleChanged); this.catcher.LocationChanged += new EventHandler(catcher_LocationChanged); } void catcher_VisibleChanged(object sender, EventArgs e) { if (!this.catcher.Visible) { this.label_CatcherWidth.Text = "寬度 ?0"; this.label_CatcherHeight.Text = "高度 ?0 "; } } void catcher_LocationChanged(object sender, EventArgs e) { this.label_CatcherLoc.Text = "位置 X: " + this.catcher.Location.X + ", Y: " + this.catcher.Location.Y; } void catcher_SizeChanged(object sender, EventArgs e) { this.label_CatcherWidth.Text = "寬度 " + this.catcher.Width; this.label_CatcherHeight.Text = "高度 " + this.catcher.Height; } void catcher_MouseDown(object sender, MouseEventArgs e) { if (e.Button == MouseButtons.Right) { this.catcherLoc = Point.Empty; this.isMouseLeftDown = false; this.catcher.Visible = false; } } void catcher_DoubleClick(object sender, EventArgs e) { Bitmap bmpCatched = new Bitmap(this.catcher.Width, this.catcher.Height); Graphics g = Graphics.FromImage(bmpCatched); g.CopyFromScreen(this.catcher.Location, new Point(0, 0), this.catcher.ClientRectangle.Size); Clipboard.SetImage(bmpCatched); if (MessageBox.Show("已經復制導剪切板") == DialogResult.OK) { Application.Exit(); } } /// <summary> /// 獲取屏幕圖像 /// </summary> private Bitmap GetScreenImage() { Bitmap bmp = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height); Graphics g = Graphics.FromImage(bmp); g.CopyFromScreen(0, 0, 0, 0, Screen.PrimaryScreen.Bounds.Size); g.Dispose(); return bmp; } private void FormBack_MouseUp(object sender, MouseEventArgs e) { if (e.Button == MouseButtons.Left) { this.catcherLoc = Point.Empty; this.isMouseLeftDown = false; } } private void FormBack_MouseDown(object sender, MouseEventArgs e) { if (e.Button == MouseButtons.Right) { if (!this.catcher.Visible) { Application.Exit(); } else { this.catcher.Visible = false; this.catcherLoc = Point.Empty; this.isMouseLeftDown = false; } } else if (e.Button == MouseButtons.Left) { if (!this.catcher.Visible) { this.catcherLoc = e.Location; this.isMouseLeftDown = true; } } } private void FormBack_MouseMove(object sender, MouseEventArgs e) { if (!this.catcher.Visible) { this.label_CatcherLoc.Text = "位置 X: " + e.X + ", Y: " + e.Y; } if (this.isMouseLeftDown) { Rectangle rect = new Rectangle(); rect.X = e.X > this.catcherLoc.X ? this.catcherLoc.X : e.X; rect.Y = e.Y > this.catcherLoc.Y ? this.catcherLoc.Y : e.Y; rect.Width = Math.Abs(e.X - this.catcherLoc.X); rect.Height = Math.Abs(e.Y - this.catcherLoc.Y); this.catcher.Bounds = rect; if (!this.catcher.Visible) { this.catcher.Show(this); } } } private void panel_Info_MouseEnter(object sender, EventArgs e) { Panel pl = (Panel)sender; if (pl.Right < this.Width / 2)//在左邊 { pl.Location = new Point(this.Width - pl.Width - 20, pl.Location.Y); } else { pl.Location = new Point(10, 10); } } }}- C#截取屏幕中選定區域的圖像
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