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WPFInkCanvas绘制矩形和椭圆

admin 11-12 09:42 327次浏览

前面说到了InkCanvas的基本操作,这里用一个实例来说明具体应用:绘制矩形和椭圆。

效果图

xaml代码


 
  
   
   
  
  
  
   
  
  
   
   
   
  
 

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
{
 /// 
 /// ROI_InkCanvas.xaml 的交互逻辑
 /// 
 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",
    Title = "Open Image File"
   };
   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 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 pointList = new List();
   for (double r = 0; r  meaInfo;
   set
   {
    meaInfo = value;
    OnPropertyChanged("MeaInfo");
   }
  }
 
  private StrokeCollection inkStrokes;
  public StrokeCollection InkStrokes
  {
   get { return inkStrokes; }
   set
   {
    inkStrokes = value;
    OnPropertyChanged("InkStrokes");
   }
  }
 }
}

补充说明:为什么要注释掉画笔属性//FitToCurve = true,可以自行体会下不注释会是个什么效果;将InkCanvas的Strokes绑定到变量有好处,在别的窗口也能获取到这个对象的哦,因为它是在viewModel里的,传viewModel参数就可以了;椭圆绘制完成后设置InkCanvas的EdittingMode为Select就可以修改大小和形状。

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。

WPFInkCanvas绘制矩形和椭圆
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