如何將畫布上劃的線分成兩部分

Question

說我在畫布上畫了一條線。我需要簡單地切割/分割線條，使其有兩條線。

Line line = new Line(); 
SolidColorBrush brush = new SolidColorBrush(); 
brush.Color = colorPicker2.SelectedColor; 
line.Stroke = brush; 
line.StrokeThickness = SliderThickness.Value; 
line.X1 = currentPoint.X; 
line.Y1 = currentPoint.Y; 
line.X2 = e.GetPosition(DrawPanel).X; 
line.Y2 = e.GetPosition(DrawPanel).Y; 
currentPoint = e.GetPosition(DrawPanel); 
DrawPanel.Children.Add(line); 

對不起，我不是特定的。用戶將點擊該線的一個點，該線將在該點被切割成兩塊。然後用戶將拖動或移動該線的每個部分。

Answer 1

試試這個：

var middleX = (line.X1 + line.X2)/2; 
var middleY = (line.Y1 + line.Y2)/2; 

Line line1 = new Line(); 
line1.X1 = line.X1; 
line1.Y1 = line.Y1; 
line1.X2 = middleX; 
line1.Y2 = middleY; 

Line line2 = new Line(); 
line2.X1 = middleX; 
line2.Y1 = middleY; 
line2.X2 = line.X2; 
line2.Y2 = line.Y2; 

Answer 2

試試這個：

  Line line = new Line(); 
      SolidColorBrush brush = new SolidColorBrush(); 
      brush.Color = colorPicker2.SelectedColor; 
      line.Stroke = brush; 
      line.StrokeThickness = SliderThickness.Value; 
      line.X1 = currentPoint.X; 
      line.Y1 = currentPoint.Y; 
      line.X2 = e.GetPosition(DrawPanel).X; 
      line.Y2 = e.GetPosition(DrawPanel).Y; 
      currentPoint = e.GetPosition(DrawPanel); 
      DrawPanel.Children.Add(line); 

      Point middlePoint = ((line.X1 + line.X2)/2, (line.Y1 + line.Y2)/2) 

      Line newFirst = new Line(); 
      newFirst.X1 = line.X1; 
      newFirst.Y1 = line.Y1; 
      newFirst.X2 = middlePoint.X; 
      newFirst.Y2 = middlePoint.Y; 
      newFirst.Stroke = brush; 
      newFirst.StrokeThickness = SliderThickness.Value; 

      Line newSecond = new Line(); 
      newSecond.X1 = middlePoint.X; 
      newSecond.Y1 = middlePoint.Y; 
      newSecond.X2 = line.X2; 
      newSecond.Y2 = line.Y2; 
      newSecond.Stroke = brush; 
      newSecond.StrokeThickness = SliderThickness.Value; 

      DrawPanel.Children.Remove(line); 
      DrawPanel.Children.Add(newFirst); 
      DrawPanel.Children.Add(newSecond);