实例介绍
【实例简介】涉及功能点:移动选区 调整大小 放大镜 通知观察者 热键
【实例截图】
【核心代码】
public class CompleteEventArgs : EventArgs {
public Bitmap Img { get; set; }
}
[Flags]
public enum ResizeTypes : byte {
None = 0x00 ,
Width = 0x01 ,
Height = 0x02 ,
X = 0x04 ,
Y = 0x08
}
static class NativeMethods {
[DllImport("user32")]
internal static extern bool RegisterHotKey(IntPtr hWnd , int id , uint control , Keys vk);
[DllImport("user32")]
internal static extern bool UnregisterHotKey(IntPtr hWnd , int id);
}
public partial class ShotForm : Form {
private Bitmap ScreenShortImg = null;
#region 选取区域用到的
public event EventHandler<CompleteEventArgs> SelectComplete;
private bool IsMouseDown = false;
private Point MouseDownPoint = Point.Empty;
private Rectangle SelectedRect = Rectangle.Empty;
private Pen SelectedRectPen = new Pen(Color.Red , 2L);
private Brush SelectedRectBrush = new SolidBrush(Color.FromArgb(40 , Color.Gray));
private Rectangle[] TouchPoints = new Rectangle[8];
private static readonly int TouchPointWH = 8;
/// <summary>
/// 触控点对应的鼠标样式
/// </summary>
private Cursor[] TouchPointCursors = new Cursor[8] {
Cursors.SizeNWSE,
Cursors.SizeNS,
Cursors.SizeNESW,
Cursors.SizeWE,
Cursors.SizeWE,
Cursors.SizeNESW,
Cursors.SizeNS,
Cursors.SizeNWSE
};
/// <summary>
/// 辅助线的点
/// </summary>
private Point[][] GuideLines = new Point[4][];
#endregion
#region 移动所选区域时用到的
private bool IsMoveRegion = false;
private Point MoveRegionStartPoint = Point.Empty;
#endregion
#region 改变大小
private bool IsResize = false;
private Point ResizeStartPoint = Point.Empty;
private ResizeTypes ResizeType = ResizeTypes.None;
private ResizeTypes[] CanResizeType = new ResizeTypes[8] {
//左上角
ResizeTypes.X | ResizeTypes.Y,
ResizeTypes.Y,
//右上角
ResizeTypes.Width | ResizeTypes.Y,
ResizeTypes.X,
ResizeTypes.Width,
//左下角
ResizeTypes.Height | ResizeTypes.X,
ResizeTypes.Height,
//右下角
ResizeTypes.Height | ResizeTypes.Width,
};
#endregion
#region 辅助显示框
private Rectangle ZoomRect = new Rectangle(0 , 0 , 100 , 100);
private Pen ZoomPen = new Pen(Color.Yellow , 3L);
#endregion
public ShotForm() {
InitializeComponent();
#region 窗体样式
this.SetStyle(ControlStyles.UserPaint , true);
this.SetStyle(ControlStyles.AllPaintingInWmPaint , true);
this.SetStyle(ControlStyles.OptimizedDoubleBuffer , true);
this.Visible = false;
this.TopLevel = true;
this.TopMost = true;
this.FormBorderStyle = FormBorderStyle.None;
this.ShowInTaskbar = false;
this.WindowState = FormWindowState.Minimized;
this.Cursor = Cursors.Cross;
#endregion
#region 注册热键
if(!NativeMethods.RegisterHotKey(this.Handle , 100 , 0 , Keys.PrintScreen)) {
MessageBox.Show("热键注册失败");
}
#endregion
#region 事件
this.Paint = ShotForm_Paint;
this.MouseDown = ShotForm_MouseDown;
this.MouseMove = ShotForm_MouseMove;
this.MouseUp = ShotForm_MouseUp;
this.DoubleClick = ShotForm_DoubleClick;
#endregion
}
/// <summary>
/// 重置标识
/// </summary>
private void ResetFlag() {
this.MouseDownPoint = Point.Empty;
this.SelectedRect = Rectangle.Empty;
this.Cursor = Cursors.Arrow;
this.IsMouseDown = false;
this.IsMoveRegion = false;
this.MoveRegionStartPoint = Point.Empty;
}
#region 事件
void ShotForm_DoubleClick(object sender , EventArgs e) {
var clickPoint = this.PointToClient(Control.MousePosition);
if(this.SelectedRect != Rectangle.Empty
&& this.SelectedRect.Contains(clickPoint)) {
if(this.SelectComplete != null) {
using(var img = new Bitmap(this.SelectedRect.Width , this.SelectedRect.Height))
using(Graphics g = Graphics.FromImage(img)) {
var destRect = new Rectangle(0 , 0 , img.Width , img.Height);
g.DrawImage(this.ScreenShortImg , destRect , this.SelectedRect , GraphicsUnit.Pixel);
this.SelectComplete(this , new CompleteEventArgs() {
Img = img
});
}
}
}
this.ResetFlag();
}
void ShotForm_MouseUp(object sender , MouseEventArgs e) {
this.IsMouseDown = false;
this.IsMoveRegion = false;
this.IsResize = false;
}
void ShotForm_MouseMove(object sender , MouseEventArgs e) {
var mp = this.PointToClient(Control.MousePosition);
this.ZoomRect.Location = mp;
if(this.IsMouseDown) {
this.SetRects(mp);
//this.Invalidate();
} else if(this.SelectedRect != Rectangle.Empty) {
this.SetCursor();
if(this.IsMoveRegion && this.SelectedRect.Contains(mp)) {
//移动所选区域
var x = mp.X - this.MoveRegionStartPoint.X;
var y = mp.Y - this.MoveRegionStartPoint.Y;
this.SetRects(null , x , y);
this.MoveRegionStartPoint.Offset(x , y);
//this.Invalidate();
} else if(IsResize && this.ResizeStartPoint != Point.Empty) {
// Resize
var x = mp.X - this.ResizeStartPoint.X;
var y = mp.Y - this.ResizeStartPoint.Y;
this.SetRects(null , x , y , this.ResizeType);
this.ResizeStartPoint.Offset(x , y);
//this.Invalidate();
}
}
this.Invalidate();
}
void ShotForm_MouseDown(object sender , MouseEventArgs e) {
var mp = this.PointToClient(Control.MousePosition);
if(this.MouseDownPoint == Point.Empty && this.SelectedRect == Rectangle.Empty) {
this.IsMouseDown = true;
this.MouseDownPoint = mp;
this.SelectedRect = Rectangle.Empty;
this.GuideLines[0] = new Point[] { new Point(0 , this.MouseDownPoint.Y) , new Point(Screen.PrimaryScreen.Bounds.Width , this.MouseDownPoint.Y) };
this.GuideLines[1] = new Point[] { new Point(this.MouseDownPoint.X , 0) , new Point(this.MouseDownPoint.X , Screen.PrimaryScreen.Bounds.Height) };
} else if(this.SelectedRect != Rectangle.Empty && this.SelectedRect.Contains(mp)) {
//在选择区域内按下鼠标，代表想移动所选区域
this.IsMoveRegion = true;
this.IsResize = false;
this.MoveRegionStartPoint = this.PointToClient(Control.MousePosition);
} else if(this.SelectedRect != Rectangle.Empty && this.TouchPoints.FirstOrDefault(p => p.Contains(mp)) != Rectangle.Empty) {
// Resize
var point = this.TouchPoints.FirstOrDefault(p => p.Contains(mp));
var idx = this.TouchPoints.ToList().FindIndex(p => p.Equals(point));
this.IsResize = true;
this.IsMoveRegion = false;
this.ResizeStartPoint = mp;
this.ResizeType = this.CanResizeType.ElementAt(idx);
}
}
void ShotForm_Paint(object sender , PaintEventArgs e) {
var g = e.Graphics;
g.SmoothingMode = SmoothingMode.HighQuality;
if(this.SelectedRect != Rectangle.Empty) {
g.DrawLines(Pens.ForestGreen , this.GuideLines[0]);
g.DrawLines(Pens.ForestGreen , this.GuideLines[1]);
g.DrawLines(Pens.ForestGreen , this.GuideLines[2]);
g.DrawLines(Pens.ForestGreen , this.GuideLines[3]);
g.DrawRectangle(this.SelectedRectPen , this.SelectedRect);
g.FillRectangle(this.SelectedRectBrush , this.SelectedRect);
g.DrawRectangles(Pens.Black , this.TouchPoints);
g.FillRectangles(Brushes.Gray , this.TouchPoints);
}
#region 放大镜
g.DrawEllipse(this.ZoomPen , this.ZoomRect);
using(var img = new Bitmap(this.ZoomRect.Width , this.ZoomRect.Height))
using(var imgG = Graphics.FromImage(img)) {
var mp = this.PointToClient(Control.MousePosition);
imgG.DrawImage(this.ScreenShortImg ,
new Rectangle(Point.Empty , img.Size) ,
new Rectangle(mp.X - this.ZoomRect.Width / 2 , mp.Y - this.ZoomRect.Height / 2 , this.ZoomRect.Width , this.ZoomRect.Height) ,
GraphicsUnit.Pixel);
#region 放大辅助图片
using(var img2 = new Bitmap(img , img.Width * 5 , img.Height * 5)) {
imgG.Clear(Color.Transparent);
#region 图片显示在圆形中
var imgRect = new Rectangle(0 , 0 , this.ZoomRect.Width , this.ZoomRect.Height);
using(var path = new GraphicsPath()) {
path.AddRectangle(imgRect);
path.AddEllipse(imgRect);
using(System.Drawing.Region reg = new System.Drawing.Region(path)) {
imgG.ExcludeClip(reg);
}
}
#endregion
imgG.DrawImage(img2 ,
new Rectangle(Point.Empty , img.Size) ,
new Rectangle((img2.Width - img.Width) / 2 , (img2.Height - img.Height) / 2 , img.Width , img.Height) ,
GraphicsUnit.Pixel);
}
#endregion
g.DrawImage(img , this.ZoomRect.Location);
//using(var fb = new TextureBrush(img , WrapMode.Tile)) {
// g.FillEllipse(fb , this.ZoomRect);
//}
}
#endregion
#region 放大镜辅助线
g.DrawLine(Pens.Blue , this.ZoomRect.X , this.ZoomRect.Y this.ZoomRect.Height / 2 , this.ZoomRect.Right , this.ZoomRect.Y this.ZoomRect.Height / 2);
g.DrawLine(Pens.Blue , this.ZoomRect.X this.ZoomRect.Width / 2 , this.ZoomRect.Y , this.ZoomRect.X this.ZoomRect.Width / 2 , this.ZoomRect.Bottom);
#endregion
//using(var ellipsePath = new GraphicsPath()) {
// ellipsePath.AddEllipse(this.ZoomRect);
// using(var brush = new PathGradientBrush(ellipsePath)) {
// brush.CenterColor = Color.FromArgb(0, Color.White);
// brush.SurroundColors = new Color[] { Color.FromArgb(180, Color.Yellow) };
// g.FillEllipse(brush, this.ZoomRect);
// }
//}
}
#endregion
/// <summary>
/// 设置鼠标样式
/// </summary>
private void SetCursor() {
var mp = this.PointToClient(Control.MousePosition);
var inTouchPoint = this.TouchPoints.FirstOrDefault(p => p.Contains(mp));
if(this.SelectedRect.Contains(mp))
this.Cursor = Cursors.SizeAll;
else if(inTouchPoint != Rectangle.Empty) {
var idx = this.TouchPoints.ToList().FindIndex(p => p.Equals(inTouchPoint));
this.Cursor = this.TouchPointCursors.ElementAt(idx);
} else {
this.Cursor = Cursors.Arrow;
}
}
private void SetResize(ref Rectangle rect , int offsetX , int offsetY , ResizeTypes type) {
//this.Text = type.ToString();
if((type & ResizeTypes.Width) == ResizeTypes.Width)
rect.Width = offsetX;
if((type & ResizeTypes.Height) == ResizeTypes.Height)
rect.Height = offsetY;
if((type & ResizeTypes.X) == ResizeTypes.X) {
rect.X = offsetX;
rect.Width -= offsetX;
}
if((type & ResizeTypes.Y) == ResizeTypes.Y) {
rect.Y = offsetY;
rect.Height -= offsetY;
}
}
/// <summary>
/// 设置要绘制的区域
/// </summary>
private void SetRects(Point? endPoint , int offsetX = 0 , int offsetY = 0 , ResizeTypes resizeType = ResizeTypes.None) {
if(endPoint.HasValue) {
var x = Math.Min(endPoint.Value.X , this.MouseDownPoint.X);
var y = Math.Min(endPoint.Value.Y , this.MouseDownPoint.Y);
var width = Math.Abs(endPoint.Value.X - this.MouseDownPoint.X);
var height = Math.Abs(endPoint.Value.Y - this.MouseDownPoint.Y);
this.SelectedRect = new Rectangle(x , y , width , height);
}
if(resizeType == ResizeTypes.None)
this.SelectedRect.Offset(offsetX , offsetY);
else
this.SetResize(ref this.SelectedRect , offsetX , offsetY , resizeType);
this.SetTouchPoints();
this.SetGuideLines();
}
private void SetTouchPoints() {
#region TouchPoints
var t = TouchPointWH / 2;
var baseSize = new Size(this.SelectedRect.Left , this.SelectedRect.Top);
var points = new List<int[]>(){
new int[]{-t, - t},//上左
new int[]{this.SelectedRect.Width / 2 - t, -t},//上中
new int[]{this.SelectedRect.Width - t, -t},//上右
new int[]{-t, this.SelectedRect.Height / 2 -t}, //中左
new int[]{this.SelectedRect.Width - t, this.SelectedRect.Height / 2 -t},//中右
new int[]{-t, this.SelectedRect.Height - t},//下左
new int[]{this.SelectedRect.Width / 2 - t, this.SelectedRect.Height - t},//下中
new int[]{this.SelectedRect.Width - t, this.SelectedRect.Height - t}//下右
};
this.TouchPoints = points.Select(p => {
var point = new Point(p[0] , p[1]);
point = Point.Add(point , baseSize);
var rect = new Rectangle(point.X , point.Y , TouchPointWH , TouchPointWH);
//rect.Offset(offsetX, offsetY);
return rect;
}).ToArray();
#endregion
}
private void SetGuideLines() {
//左上角的横线
this.GuideLines[0] = new Point[2];
this.GuideLines[0][0] = new Point(0 , this.SelectedRect.Top);
this.GuideLines[0][1] = new Point(Screen.PrimaryScreen.Bounds.Right , this.SelectedRect.Top);
//左上角的竖线
this.GuideLines[1] = new Point[2];
this.GuideLines[1][0] = new Point(this.SelectedRect.Left , 0);
this.GuideLines[1][1] = new Point(this.SelectedRect.Left , Screen.PrimaryScreen.Bounds.Bottom);
//右下角的横线
this.GuideLines[2] = new Point[2];
this.GuideLines[2][0] = new Point(0 , this.SelectedRect.Bottom);
this.GuideLines[2][1] = new Point(Screen.PrimaryScreen.Bounds.Right , this.SelectedRect.Bottom);
//右下角的竖线
this.GuideLines[3] = new Point[2];
this.GuideLines[3][0] = new Point(this.SelectedRect.Right , 0);
this.GuideLines[3][1] = new Point(this.SelectedRect.Right , Screen.PrimaryScreen.Bounds.Bottom);
}
/// <summary>
/// 抓取当前屏幕
/// </summary>
private void PrintScreen() {
Screen sc = Screen.PrimaryScreen;
this.ScreenShortImg = new Bitmap(sc.Bounds.Width , sc.Bounds.Height);
Graphics g = Graphics.FromImage(this.ScreenShortImg);
g.CopyFromScreen(Point.Empty , Point.Empty , sc.Bounds.Size);
g.DrawImage(this.ScreenShortImg , Point.Empty);
this.BackgroundImage = this.ScreenShortImg;
}
#region 热键处理
protected override bool ProcessCmdKey(ref Message msg , Keys keyData) {
if(keyData == Keys.Escape) {
this.WindowState = FormWindowState.Minimized;
this.ResetFlag();
}
return base.ProcessCmdKey(ref msg , keyData);
}
protected override void OnClosed(EventArgs e) {
NativeMethods.UnregisterHotKey(this.Handle , 100);
base.OnClosed(e);
}
protected override void WndProc(ref Message m) {
if(m.Msg == 0X312 && m.WParam.ToString() == "100") {
this.Launch();
}
base.WndProc(ref m);
}
public void Launch() {
this.ResetFlag();
this.PrintScreen();
this.WindowState = FormWindowState.Maximized;
this.Visible = true;
this.Show();
}
#endregion
标签： 截图
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