您好，我有 C# 表单应用程序。我想将图像加载到图片框中并将图像拖动到我想要的位置。完成拖动后，我添加了一个复选框 让用户点击复选框。
然后，用户可以使用鼠标选择图像的一部分。该部分将显示在另一个图片框内。所以，我做了一些搜索并提出了一个解决方案 这实际上不起作用。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace HCRLibrarytest
{
public partial class MainForm : Form
{
private Point startingPoint = Point.Empty;
private Point movingPoint = Point.Empty;
private bool panning = false;
Image _OrginalBitmap;
Image _NewBitmap;
private bool IsSelecting = false;
private int X0, Y0, X1, Y1;
static bool isimagepositioned = false;
public MainForm()
{
InitializeComponent();
}
private void btn_openimage_Click(object sender, EventArgs e)
{
OpenFileDialog dialog2 = new OpenFileDialog
{
Filter = "Bitmap Image (*.jpeg)|*.jpeg"
};
using (OpenFileDialog dialog = dialog2)
{
if (dialog.ShowDialog() == DialogResult.OK)
{
try
{
using (StreamReader reader = new StreamReader(dialog.FileName))
{
this._OrginalBitmap = new Bitmap(dialog.FileName);
this.pb_fullimage.Image = this._OrginalBitmap;
}
}
catch (Exception exception)
{
MessageBox.Show(exception.ToString());
}
}
}
}
private void pb_fullimage_MouseUp(object sender, MouseEventArgs e)
{
if (_OrginalBitmap != null)
{
if(!isimagepositioned)
{
panning = false;
}
else
{
if (!IsSelecting) return;
IsSelecting = false;
pb_fullimage.Image = _OrginalBitmap;
int wid = Math.Abs(X0 - X1);
int hgt = Math.Abs(Y0 - Y1);
if ((wid < 1) || (hgt < 1)) return;
Bitmap area = new Bitmap(wid, hgt);
using (Graphics gr = Graphics.FromImage(area))
{
Rectangle source_rectangle = new Rectangle(Math.Min(X0, X1), Math.Min(Y0, Y1), wid, hgt);
Rectangle dest_rectangle = new Rectangle(0, 0, wid, hgt);
gr.DrawImage(pb_fullimage.Image, dest_rectangle, source_rectangle, GraphicsUnit.Pixel);
}
pb_selectedportion.Image = area;
}
}
}
private void pb_fullimage_MouseDown(object sender, MouseEventArgs e)
{
if (_OrginalBitmap != null)
{
if (!isimagepositioned)
{
panning = true;
startingPoint = new Point(e.Location.X - movingPoint.X,e.Location.Y - movingPoint.Y);
}
else
{
_NewBitmap = new Bitmap(pb_fullimage.Image);
IsSelecting = true;
X0 = e.X;
Y0 = e.Y;
}
}
}
private void pb_fullimage_MouseMove(object sender, MouseEventArgs e)
{
if (_OrginalBitmap != null)
{
if (!isimagepositioned)
{
if (panning)
{
movingPoint = new Point(e.Location.X - startingPoint.X,e.Location.Y - startingPoint.Y);
pb_fullimage.Invalidate();
}
}
else
{
if (!IsSelecting) return;
X1 = e.X;
Y1 = e.Y;
Bitmap bm = new Bitmap(_NewBitmap);
using (Graphics gr = Graphics.FromImage(bm))
{
gr.DrawRectangle(Pens.Red, Math.Min(X0, X1), Math.Min(Y0, Y1), Math.Abs(X0 - X1), Math.Abs(Y0 - Y1));
}
pb_fullimage.Image = bm;
}
}
}
private void pb_fullimage_Paint(object sender, PaintEventArgs e)
{
if (_OrginalBitmap != null && !isimagepositioned)
{
e.Graphics.Clear(Color.White);
e.Graphics.DrawImage(_OrginalBitmap, movingPoint);
}
}
private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
if (checkBox1.Checked)
{
isimagepositioned = true;
}
else
{
isimagepositioned = false;
}
}
}
}
当我拖动并选中“图像定位”并使用鼠标移动进行选择时。它总是给我相对于原始图像位置的图像。
那么，有人可以帮忙解决这个问题吗。
最佳答案
由于没有人回答我，所以我找到了答案。这对我有用。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace HCRLibrarytest
{
public partial class MainForm : Form
{
public Point startingPoint = Point.Empty;
public Point movingPoint = Point.Empty;
public bool panning = false;
Image _OrginalBitmap;
public static Image _NewBitmap;
public bool IsSelecting = false;
public int X0, Y0, X1, Y1;
public MainForm()
{
InitializeComponent();
}
public void btn_openimage_Click(object sender, EventArgs e)
{
OpenFileDialog dialog2 = new OpenFileDialog
{
Filter = "Bitmap Image (*.jpeg)|*.jpeg"
};
using (OpenFileDialog dialog = dialog2)
{
if (dialog.ShowDialog() == DialogResult.OK)
{
try
{
using (StreamReader reader = new StreamReader(dialog.FileName))
{
this._OrginalBitmap = new Bitmap(dialog.FileName);
this.pb_fullimage.Image = this._OrginalBitmap;
}
}
catch (Exception exception)
{
MessageBox.Show(exception.ToString());
}
}
}
}
public void pb_fullimage_MouseUp(object sender, MouseEventArgs e)
{
if (pb_fullimage.Image != null)
{
if (!checkBox1.Checked)
{
panning = false;
}
else
{
if (!IsSelecting) return;
IsSelecting = false;
pb_fullimage.Image = _NewBitmap;
int wid = Math.Abs(X0 - X1);
int hgt = Math.Abs(Y0 - Y1);
if ((wid < 1) || (hgt < 1)) return;
Bitmap area = new Bitmap(wid, hgt);
using (Graphics gr = Graphics.FromImage(area))
{
Rectangle source_rectangle = new Rectangle(Math.Min(X0, X1), Math.Min(Y0, Y1), wid, hgt);
Rectangle dest_rectangle = new Rectangle(0, 0, wid, hgt);
gr.DrawImage(_NewBitmap, dest_rectangle, source_rectangle, GraphicsUnit.Pixel);
}
pb_selectedportion.Image = area;
}
}
}
public void pb_fullimage_MouseDown(object sender, MouseEventArgs e)
{
if (pb_fullimage.Image != null)
{
if (!checkBox1.Checked)
{
panning = true;
startingPoint = new Point(e.Location.X - movingPoint.X, e.Location.Y - movingPoint.Y);
}
else
{
IsSelecting = true;
X0 = e.X;
Y0 = e.Y;
}
}
}
public void pb_fullimage_MouseMove(object sender, MouseEventArgs e)
{
if (pb_fullimage.Image != null)
{
if (!checkBox1.Checked)
{
if (panning)
{
movingPoint = new Point(e.Location.X - startingPoint.X, e.Location.Y - startingPoint.Y);
pb_fullimage.Invalidate();
using (Bitmap bitmap = new Bitmap(pb_fullimage.ClientSize.Width, pb_fullimage.ClientSize.Height))
{
pb_fullimage.DrawToBitmap(bitmap, pb_fullimage.ClientRectangle);
try { bitmap.Save(AppDomain.CurrentDomain.BaseDirectory + "draw.jpg"); }
catch (Exception ex) { Console.Write(ex.ToString()); }
}
}
}
else
{
if (!IsSelecting) return;
X1 = e.X;
Y1 = e.Y;
Bitmap bm = new Bitmap(Bitmap.FromStream(File.OpenRead(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "draw.jpg"))));
using (Graphics gr = Graphics.FromImage(bm))
{
gr.DrawRectangle(Pens.WhiteSmoke, Math.Min(X0, X1), Math.Min(Y0, Y1), Math.Abs(X0 - X1), Math.Abs(Y0 - Y1));
}
_NewBitmap = bm;
}
}
}
public void pb_fullimage_Paint(object sender, PaintEventArgs e)
{
if (pb_fullimage.Image != null && !checkBox1.Checked)
{
e.Graphics.Clear(Color.White);
e.Graphics.DrawImage(pb_fullimage.Image, movingPoint);
}
}
}
}
关于c# - 在 Picturebox 中拖动图像并将其定位，然后选择图像的一部分，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33594485/