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DHSoftware/Views/ImageViewerControl.cs
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306
DHSoftware/Views/ImageViewerControl.cs
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using System;
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using System.Drawing;
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using System.Drawing.Drawing2D;
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using System.Windows.Forms;
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namespace DHSoftware.Views
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{
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public partial class ImageViewerControl : UserControl
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{
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#region 内部控件
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private PictureBox pictureBox;
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private Label statusLabel;
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#endregion
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#region 核心字段
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private Bitmap _currentImage;
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private float _scale = 1.0f;
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private PointF _offset = PointF.Empty;
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private RectangleF _roiRect;
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private PointF _roiStart;
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private bool _isDrawing;
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private Point _dragStart;
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private bool _isDragging;
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private Pen _roiPen = new Pen(Color.Red, 2);
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#endregion
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#region 公开属性
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#region 公开属性
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public Bitmap Image
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{
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get => _currentImage;
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set
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{
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// 记录旧状态
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var oldSize = _currentImage?.Size ?? Size.Empty;
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var oldScale = _scale;
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var oldOffset = _offset;
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_currentImage?.Dispose();
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_currentImage = value;
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if (_currentImage != null)
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{
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if (_currentImage.Size != oldSize)
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{
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// 尺寸不同时：重置ROI、自动适配
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_roiRect = RectangleF.Empty;
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AutoFit();
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}
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else
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{
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// 尺寸相同时：保留缩放和偏移
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_scale = oldScale;
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_offset = oldOffset;
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ClampOffset();
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}
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}
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pictureBox.Invalidate();
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}
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}
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#endregion
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public RectangleF CurrentROI => _roiRect;
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#endregion
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public ImageViewerControl()
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{
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InitializeComponents();
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SetupDoubleBuffering();
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}
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#region 初始化
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private void InitializeComponents()
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{
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// 主显示区域
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pictureBox = new PictureBox
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{
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Dock = DockStyle.Fill,
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BackColor = Color.DarkGray,
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Cursor = Cursors.Cross
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};
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// 状态栏
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statusLabel = new Label
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{
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Dock = DockStyle.Bottom,
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Height = 20,
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Text = "就绪",
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BorderStyle = BorderStyle.FixedSingle,
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Font = new Font("Consolas", 10)
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};
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// 事件绑定
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pictureBox.MouseDown += PictureBox_MouseDown;
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pictureBox.MouseMove += PictureBox_MouseMove;
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pictureBox.MouseUp += PictureBox_MouseUp;
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pictureBox.MouseWheel += PictureBox_MouseWheel;
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pictureBox.Paint += PictureBox_Paint;
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Controls.Add(pictureBox);
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Controls.Add(statusLabel);
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}
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private void SetupDoubleBuffering()
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{
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typeof(PictureBox).GetMethod("SetStyle",
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System.Reflection.BindingFlags.NonPublic |
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System.Reflection.BindingFlags.Instance)
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?.Invoke(pictureBox, new object[] {
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ControlStyles.OptimizedDoubleBuffer |
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ControlStyles.AllPaintingInWmPaint,
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true
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});
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}
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#endregion
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#region 核心功能
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private void AutoFit()
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{
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if (_currentImage == null) return;
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const float marginRatio = 0.1f;
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float marginWidth = Width * marginRatio;
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float marginHeight = Height * marginRatio;
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_scale = Math.Min(
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(Width - marginWidth * 2) / _currentImage.Width,
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(Height - marginHeight * 2) / _currentImage.Height
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);
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_offset.X = marginWidth + (Width - marginWidth * 2 - _currentImage.Width * _scale) / 2;
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_offset.Y = marginHeight + (Height - marginHeight * 2 - _currentImage.Height * _scale) / 2;
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}
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private void PictureBox_Paint(object sender, PaintEventArgs e)
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{
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if (_currentImage == null) return;
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// 绘制图像
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var destRect = new RectangleF(
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_offset.X,
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_offset.Y,
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_currentImage.Width * _scale,
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_currentImage.Height * _scale);
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e.Graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
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e.Graphics.DrawImage(_currentImage, destRect);
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// 绘制ROI
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if (!_roiRect.IsEmpty)
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{
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var displayRect = new RectangleF(
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_roiRect.X * _scale + _offset.X,
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_roiRect.Y * _scale + _offset.Y,
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_roiRect.Width * _scale,
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_roiRect.Height * _scale);
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using (var pen = new Pen(_roiPen.Color, _roiPen.Width / _scale))
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{
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e.Graphics.DrawRectangle(pen,
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displayRect.X,
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displayRect.Y,
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displayRect.Width,
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displayRect.Height);
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}
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}
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}
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#endregion
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#region 鼠标事件
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private void PictureBox_MouseDown(object sender, MouseEventArgs e)
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{
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if (e.Button == MouseButtons.Left && _currentImage != null)
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{
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_roiStart = ClampCoordinates(ConvertToImageCoords(e.Location));
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_isDrawing = true;
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}
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else if (e.Button == MouseButtons.Right)
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{
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_dragStart = e.Location;
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_isDragging = true;
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}
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}
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private void PictureBox_MouseMove(object sender, MouseEventArgs e)
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{
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if (_isDragging)
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{
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_offset.X += e.X - _dragStart.X;
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_offset.Y += e.Y - _dragStart.Y;
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_dragStart = e.Location;
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ClampOffset();
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pictureBox.Invalidate();
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}
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else if (_isDrawing && _currentImage != null)
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{
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PointF current = ClampCoordinates(ConvertToImageCoords(e.Location));
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_roiRect = new RectangleF(
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Math.Min(_roiStart.X, current.X),
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Math.Min(_roiStart.Y, current.Y),
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Math.Abs(_roiStart.X - current.X),
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Math.Abs(_roiStart.Y - current.Y)
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);
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pictureBox.Invalidate();
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}
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UpdateStatus(e.Location);
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}
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private void PictureBox_MouseUp(object sender, MouseEventArgs e)
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{
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_isDragging = false;
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_isDrawing = false;
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}
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private void PictureBox_MouseWheel(object sender, MouseEventArgs e)
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{
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if (_currentImage == null) return;
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PointF mousePos = e.Location;
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PointF imgPosBefore = ConvertToImageCoords(mousePos);
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if (imgPosBefore.X < 0 || imgPosBefore.X > _currentImage.Width ||
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imgPosBefore.Y < 0 || imgPosBefore.Y > _currentImage.Height) return;
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float zoom = e.Delta > 0 ? 1.1f : 0.9f;
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float newScale = Math.Clamp(_scale * zoom, 0.1f, 10f);
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_offset.X = mousePos.X - imgPosBefore.X * newScale;
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_offset.Y = mousePos.Y - imgPosBefore.Y * newScale;
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_scale = newScale;
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ClampOffset();
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pictureBox.Invalidate();
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}
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#endregion
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#region 辅助方法
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private PointF ConvertToImageCoords(PointF mousePos)
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{
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return new PointF(
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(mousePos.X - _offset.X) / _scale,
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(mousePos.Y - _offset.Y) / _scale);
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}
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private PointF ClampCoordinates(PointF point)
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{
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return new PointF(
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Math.Max(0, Math.Min(_currentImage.Width, point.X)),
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Math.Max(0, Math.Min(_currentImage.Height, point.Y)));
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}
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private void ClampOffset()
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{
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if (_currentImage == null) return;
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float imgWidth = _currentImage.Width * _scale;
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float imgHeight = _currentImage.Height * _scale;
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if (imgWidth <= Width)
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{
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_offset.X = Math.Clamp(_offset.X, 0, Width - imgWidth);
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}
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else
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{
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_offset.X = Math.Clamp(_offset.X, Width - imgWidth, 0);
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}
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if (imgHeight <= Height)
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{
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_offset.Y = Math.Clamp(_offset.Y, 0, Height - imgHeight);
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}
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else
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{
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_offset.Y = Math.Clamp(_offset.Y, Height - imgHeight, 0);
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}
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}
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private void UpdateStatus(Point mousePos)
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{
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if (_currentImage == null) return;
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PointF imgPos = ConvertToImageCoords(mousePos);
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bool inImage = imgPos.X >= 0 && imgPos.X <= _currentImage.Width &&
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imgPos.Y >= 0 && imgPos.Y <= _currentImage.Height;
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string roiInfo = _roiRect.IsEmpty ?
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"未选择区域" :
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$"选区: X={_roiRect.X:0} Y={_roiRect.Y:0} {_roiRect.Width:0}x{_roiRect.Height:0}";
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statusLabel.Text = inImage ?
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$"坐标: ({imgPos.X:0}, {imgPos.Y:0}) | 缩放: {_scale * 100:0}% | {roiInfo}" :
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$"图像尺寸: {_currentImage.Width}x{_currentImage.Height} | 缩放: {_scale * 100:0}% | {roiInfo}";
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}
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public void ClearROI()
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{
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_roiRect = RectangleF.Empty;
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pictureBox.Invalidate(); // 触发重绘
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UpdateStatus(Point.Empty); // 更新状态栏
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}
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#endregion
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}
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}
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