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namespace SnippingTool;
public partial class SnippingTool : Form
{
public static Image? Snip()
{
var rc = Screen.PrimaryScreen.Bounds;
using Bitmap bmp = new Bitmap(rc.Width, rc.Height, System.Drawing.Imaging.PixelFormat.Format32bppPArgb);
using Graphics gr = Graphics.FromImage(bmp);
gr.CopyFromScreen(0, 0, 0, 0, bmp.Size);
using var snipper = new SnippingTool(bmp);
return snipper.ShowDialog() == DialogResult.OK ? snipper.Image : null;
}
public SnippingTool(Image screenShot)
{
InitializeComponent();
BackgroundImage = screenShot;
ShowInTaskbar = false;
FormBorderStyle = FormBorderStyle.None;
WindowState = FormWindowState.Maximized;
DoubleBuffered = true;
}
public Image? Image { get; set; }
private Rectangle rcSelect = new Rectangle();
private Point pntStart;
protected override void OnMouseDown(MouseEventArgs e)
{
if (e.Button != MouseButtons.Left)
{
return;
}
pntStart = e.Location;
rcSelect = new Rectangle(e.Location, new Size(0, 0));
Invalidate();
}
protected override void OnMouseMove(MouseEventArgs e)
{
if (e.Button != MouseButtons.Left)
{
return;
}
int x1 = Math.Min(e.X, pntStart.X);
int y1 = Math.Min(e.Y, pntStart.Y);
int x2 = Math.Max(e.X, pntStart.X);
int y2 = Math.Max(e.Y, pntStart.Y);
rcSelect = new Rectangle(x1, y1, x2 - x1, y2 - y1);
Invalidate();
}
protected override void OnMouseUp(MouseEventArgs e)
{
if (rcSelect.Width <= 0 || rcSelect.Height <= 0)
{
return;
}
Image = new Bitmap(rcSelect.Width, rcSelect.Height);
using Graphics gr = Graphics.FromImage(Image);
gr.DrawImage(BackgroundImage, new Rectangle(0, 0, Image.Width, Image.Height),
rcSelect, GraphicsUnit.Pixel);
DialogResult = DialogResult.OK;
}
protected override void OnPaint(PaintEventArgs e)
{
using Brush br = new SolidBrush(Color.FromArgb(120, Color.White));
int x1 = rcSelect.X; int x2 = rcSelect.X + rcSelect.Width;
int y1 = rcSelect.Y; int y2 = rcSelect.Y + rcSelect.Height;
e.Graphics.FillRectangle(br, new Rectangle(0, 0, x1, Height));
e.Graphics.FillRectangle(br, new Rectangle(x2, 0, Width - x2, Height));
e.Graphics.FillRectangle(br, new Rectangle(x1, 0, x2 - x1, y1));
e.Graphics.FillRectangle(br, new Rectangle(x1, y2, x2 - x1, Height - y2));
using Pen pen = new Pen(Color.Red, 3);
e.Graphics.DrawRectangle(pen, rcSelect);
}
protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
if (keyData == Keys.Escape)
{
DialogResult = DialogResult.Cancel;
}
return base.ProcessCmdKey(ref msg, keyData);
}
}
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