后台代码
using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
namespace WPF_InkCanvas
{
/// <summary>
/// ROI_InkCanvas.xaml 的交互逻辑
/// </summary>
public partial class ROI_InkCanvas : Window
{
private ViewModel viewModel;
private System.Windows.Point iniP;
public ROI_InkCanvas()
{
InitializeComponent();
DrawingAttributes drawingAttributes = new DrawingAttributes
{
Color = Colors.Red,
Width = 2,
Height = 2,
StylusTip = StylusTip.Rectangle,
//FitToCurve = true,
IsHighlighter = false,
IgnorePressure = true,
};
inkCanvasMeasure.DefaultDrawingAttributes = drawingAttributes;
viewModel = new ViewModel
{
MeaInfo = "测试······",
InkStrokes = new StrokeCollection(),
};
DataContext = viewModel;
}
private void OpenFile_Click(object sender, RoutedEventArgs e)
{
OpenFileDialog openDialog = new OpenFileDialog
{
Filter = "Image Files (*.jpg)|*.jpg|Image Files (*.png)|*.png|Image Files (*.bmp)|*.bmp",
};
if (openDialog.ShowDialog() == true)
{
BitmapImage image = new BitmapImage();
image.BeginInit();
image.UriSource = new Uri(openDialog.FileName, UriKind.RelativeOrAbsolute);
image.EndInit();
imgMeasure.Source = image;
}
}
private void DrawSquare_Click(object sender, RoutedEventArgs e)
{
if (btnSquare.IsChecked == true)
{
btnEllipse.IsChecked = false;
}
}
private void DrawEllipse_Click(object sender, RoutedEventArgs e)
{
if (btnEllipse.IsChecked == true)
{
btnSquare.IsChecked = false;
}
}
private List<System.Windows.Point> GenerateEclipseGeometry(System.Windows.Point st, System.Windows.Point ed)
{
double a = 0.5 * (ed.X - st.X);
double b = 0.5 * (ed.Y - st.Y);
List<System.Windows.Point> pointList = new List<System.Windows.Point>();
for (double r = 0; r <= 2 * Math.PI; r = r + 0.01)
{
pointList.Add(new System.Windows.Point(0.5 * (st.X + ed.X) + a * Math.Cos(r), 0.5 * (st.Y + ed.Y) + b * Math.Sin(r)));
}
return pointList;
}
private void InkCanvasMeasure_MouseDown(object sender, MouseButtonEventArgs e)
{
if (e.LeftButton == MouseButtonState.Pressed)
{
iniP = e.GetPosition(inkCanvasMeasure);
}
}
private void InkCanvasMeasure_MouseMove(object sender, MouseEventArgs e)
{
if (e.LeftButton == MouseButtonState.Pressed)
{
// Draw square
if (btnSquare.IsChecked == true)
{
System.Windows.Point endP = e.GetPosition(inkCanvasMeasure);
List<System.Windows.Point> pointList = new List<System.Windows.Point>
{
new System.Windows.Point(iniP.X, iniP.Y),
new System.Windows.Point(iniP.X, endP.Y),
new System.Windows.Point(endP.X, endP.Y),
new System.Windows.Point(endP.X, iniP.Y),
new System.Windows.Point(iniP.X, iniP.Y),
};
StylusPointCollection point = new StylusPointCollection(pointList);
Stroke stroke = new Stroke(point)
{
DrawingAttributes = inkCanvasMeasure.DefaultDrawingAttributes.Clone()
};
viewModel.InkStrokes.Clear();
viewModel.InkStrokes.Add(stroke);
}
// Draw Eclipse
else if (btnEllipse.IsChecked == true)
{
System.Windows.Point endP = e.GetPosition(inkCanvasMeasure);
List<System.Windows.Point> pointList = GenerateEclipseGeometry(iniP, endP);
StylusPointCollection point = new StylusPointCollection(pointList);
Stroke stroke = new Stroke(point)
{
DrawingAttributes = inkCanvasMeasure.DefaultDrawingAttributes.Clone()
};
viewModel.InkStrokes.Clear();
viewModel.InkStrokes.Add(stroke);
}
}
}
}
}
