使用C#实现对任意区域任意大小的截图
作者:lingxiao16888
这篇文章主要为大家详细介绍了如何使用C#实现简单的截图功能,可以对任意区域任意大小的截图,感兴趣的小伙伴可以跟随小编一起学习一下
1.目的
实现类似系统截图工具那样对屏幕任何区域自定义大小的截图。
2.效果展示
点击截图
选择需要截图的区域:
区域选择完成后,单击右键完成截图:
在合适的载体上粘贴截图:
3.代码
public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { this.WindowState = FormWindowState.Minimized; //获取屏幕截屏 Bitmap bcgImg = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height); using (Graphics g= Graphics.FromImage(bcgImg)) { g.CopyFromScreen(new Point(0, 0), new Point(0, 0), new Size(bcgImg.Width, bcgImg.Height)); } //将图片传给截图窗口 CaptureFrm frm = new CaptureFrm(bcgImg); frm.TopMost = true; if( frm.ShowDialog()== DialogResult.OK) { MessageBox.Show("截图已保存至剪贴板,请选择合适的载体进行粘贴!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information); } else { MessageBox.Show("取消截图","提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); } this.WindowState = FormWindowState.Normal; } }
public partial class CaptureFrm : Form { Bitmap bcgImg; bool drawingFlag=false; Point startPoint; Point endPoint; Graphics main_g; bool isCapture=false; public CaptureFrm(Bitmap img) { InitializeComponent(); bcgImg = img; } private void CaptureFrm_Load(object sender, EventArgs e) { //背景 this.BackgroundImage = bcgImg; this.BackgroundImageLayout = ImageLayout.Stretch; } private void CaptureFrm_KeyDown(object sender, KeyEventArgs e) { //如果按下ESC键则退出 if (e.KeyCode == Keys.Escape) { // this.Close(); DialogResult = DialogResult.Cancel; } } private void CaptureFrm_MouseDown(object sender, MouseEventArgs e) { if(e.Button== MouseButtons.Left) { drawingFlag = true; startPoint = e.Location; main_g = this.CreateGraphics(); } if(e.Button== MouseButtons.Right) { if (isCapture) { Bitmap map = new Bitmap(width, height); Bitmap source = new Bitmap(bcgImg, new Size(this.Width, this.Height)); using (Graphics g = Graphics.FromImage(map)) { g.DrawImage(source, new Rectangle(0, 0, map.Width, map.Height), new Rectangle(recX, recY, width, height), GraphicsUnit.Pixel); } Clipboard.SetImage(map); main_g.Dispose(); DialogResult = DialogResult.OK; isCapture = false; } } } private void CaptureFrm_MouseUp(object sender, MouseEventArgs e) { if(e.Button== MouseButtons.Left) { //进行最终边界确认 endPoint = e.Location; drawingFlag = false; isCapture = true; } } int recX, recY, width, height; private void CaptureFrm_MouseMove(object sender, MouseEventArgs e) { if (!drawingFlag ||main_g==null) return; width = Math.Abs(startPoint.X - e.X); height = Math.Abs(startPoint.Y - e.Y); if (startPoint.X < e.X) { recX = startPoint.X; } else { recX = startPoint.X-width; } if (startPoint.Y < e.Y) { recY = startPoint.Y; } else { recY = startPoint.Y-height; } CaptureFrm_Paint(null, null); Pen pen = new Pen(Color.Green, 2); pen.DashPattern = new float[] { 1, 2 }; pen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash; main_g.DrawRectangle(pen, recX, recY, width, height); string ss = $"X:{recX},Y:{recY}\n width:{width},height:{height}"; main_g.DrawString(ss, new Font("宋体", 12,FontStyle.Bold), Brushes.Red, new Point(10, 10)); } private void CaptureFrm_Paint(object sender, PaintEventArgs e) { if (main_g == null) return; // main_g.Clear(Color.WhiteSmoke); main_g.DrawImage(bcgImg, new Rectangle(0, 0, this.Width, this.Height), new Rectangle(0, 0, bcgImg.Width, bcgImg.Height), GraphicsUnit.Pixel); } private void CaptureFrm_DoubleClick(object sender, EventArgs e) { } }
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