<Window x:Class="WpfApplication1.PerpendicularLine"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Perpendicular Line" Height="300" Width="400">
<Viewbox Stretch="Uniform">
<Canvas Name="canvas1" Grid.Column="1" Margin="10"
ClipToBounds="True" Width="270" Height="280">
<TextBlock Name="tbPoint1" Canvas.Top="10">
Point1
</TextBlock>
<TextBlock Name="tbPoint2" Canvas.Top="25">
Point2
</TextBlock>
<TextBlock Name="tbPoint3" Canvas.Top="40">
Point3
</TextBlock>
<TextBlock Name="tbPoint4" Canvas.Top="55">
Point4
</TextBlock>
</Canvas>
</Viewbox>
</Window>
//File:Window.xaml.cs
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Shapes;
namespace WpfApplication1
{
public partial class PerpendicularLine : Window
{
private Line line1;
private Line line2;
public PerpendicularLine()
{
InitializeComponent();
Rectangle rect = new Rectangle();
rect.Stroke = Brushes.Black;
rect.Width = canvas1.Width;
rect.Height = canvas1.Height;
canvas1.Children.Add(rect);
line1 = new Line();
line2 = new Line();
AddLines();
}
private void AddLines()
{
Point pt1 = new Point();
Point pt2 = new Point();
pt1.X = 30;
pt1.Y = 300;
pt2.X = 100;
pt2.Y = 500;
double length = 400;
line1 = new Line();
line1.X1 = pt1.X;
line1.Y1 = pt1.Y;
line1.X2 = pt2.X;
line1.Y2 = pt2.Y;
line1.Stroke = Brushes.Gray;
line1.StrokeThickness = 4;
canvas1.Children.Add(line1);
Canvas.SetLeft(tbPoint1, pt1.X);
Canvas.SetTop(tbPoint1, pt1.Y);
Canvas.SetLeft(tbPoint2, pt2.X);
Canvas.SetTop(tbPoint2, pt2.Y);
tbPoint1.Text = "Pt1(" + pt1.ToString() + ")";
tbPoint2.Text = "Pt2(" + pt2.ToString() + ")";
Vector v1 = pt1 - pt2;
Matrix m1 = new Matrix();
Point pt3 = new Point();
Point pt4 = new Point();
m1.Rotate(-90);
v1.Normalize();
v1 *= length;
line2 = new Line();
line2.Stroke = Brushes.Gray;
line2.StrokeThickness = 4;
line2.StrokeDashArray =
DoubleCollection.Parse("3, 1");
pt3 = pt2 + v1 * m1;
m1 = new Matrix();
m1.Rotate(90);
pt4 = pt2 + v1 * m1;
line2.X1 = pt3.X;
line2.Y1 = pt3.Y;
line2.X2 = pt4.X;
line2.Y2 = pt4.Y;
canvas1.Children.Add(line2);
Canvas.SetLeft(tbPoint3, pt3.X);
Canvas.SetTop(tbPoint3, pt3.Y);
Canvas.SetLeft(tbPoint4, pt4.X);
Canvas.SetTop(tbPoint4, pt4.Y);
pt3.X = Math.Round(pt3.X, 0);
pt3.Y = Math.Round(pt3.Y, 0);
pt4.X = Math.Round(pt4.X, 0);
pt4.Y = Math.Round(pt4.Y, 0);
tbPoint3.Text = "Pt3(" + pt3.ToString() + ")";
tbPoint4.Text = "Pt4(" + pt4.ToString() + ")";
}
}
}
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