<Window x:Class="FlashingEffect.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:FlashingEffect"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Grid>
<Canvas x:Name="container" Width="400" Height="400"></Canvas>
<GroupBox Header="GroupBox" HorizontalAlignment="Left" Height="388" Margin="10,10,0,0" VerticalAlignment="Top" Width="749"/>
</Grid>
</Window>
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.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace FlashingEffect
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
private Point lastMousePosition = new Point(0, 0);//Mouse position
private int triangleLength = 100;//Triangle side length
public MainWindow()
{
InitializeComponent();
this.Loaded += MainWindow_Loaded;
CompositionTarget.Rendering += UpdateTriangle;
this.container.PreviewMouseMove += UpdateLastMousePosition;
}
private void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
//Easily divide the rectangle into combined triangles
int horizontalCount = (int)(this.container.ActualWidth / triangleLength);
int verticalCount = (int)(this.container.ActualHeight / triangleLength);
for (int i = 0; i < horizontalCount; i++)
{
for (int j = 0; j < verticalCount; j++)
{
Path trianglePath1 = new Path();
var g1 = new StreamGeometry();
using (StreamGeometryContext context = g1.Open())
{
context.BeginFigure(new Point(i * triangleLength, j * triangleLength), true, true);
context.LineTo(new Point(i * triangleLength, (j + 1) * triangleLength), true, false);
context.LineTo(new Point((i + 1) * triangleLength, (j + 1) * triangleLength), true, false);
}
trianglePath1.Data = g1;
trianglePath1.Fill = new SolidColorBrush(Color.FromArgb(255, 247, 18, 65));
this.container.Children.Add(trianglePath1);
Path trianglePath2 = new Path();
var g2 = new StreamGeometry();
using (StreamGeometryContext context = g2.Open())
{
context.BeginFigure(new Point(i * triangleLength, j * triangleLength), true, true);
context.LineTo(new Point((i + 1) * triangleLength, j * triangleLength), true, false);
context.LineTo(new Point((i + 1) * triangleLength, (j + 1) * triangleLength), true, false);
}
trianglePath2.Data = g2;
trianglePath2.Fill = new SolidColorBrush(Color.FromArgb(255, 247, 18, 65));
this.container.Children.Add(trianglePath2);
}
}
}
private void UpdateTriangle(object sender, EventArgs e)
{
//Get child controls
List<Path> childList = GetChildObjects<Path>(this.container);
for (int i = 0; i < childList.Count; i++)
{
for (int j = 1; j < childList.Count; j++)
{
string si = childList[i].Data.ToString();
string si1 = MidStrEx(si, "M", "L");
string si2 = MidStrEx(si, "L", " ");
string si3 = MidStrEx(si, " ", "z");
string sj = childList[j].Data.ToString();
string sj1 = MidStrEx(sj, "M", "L");
string sj2 = MidStrEx(sj, "L", " ");
string sj3 = MidStrEx(sj, " ", "z");
//Left and right triangle judgment
if (si1 == sj1 && si3 == sj3)
{
double x = childList[i].Data.Bounds.X + (1 - Math.Pow(2, 0.5) / 2) * triangleLength - lastMousePosition.X;
double y = childList[i].Data.Bounds.Y + (1 - Math.Pow(2, 0.5) / 2) * triangleLength - lastMousePosition.Y;
double rRadio = 1 - Math.Pow(x * x + y * y, 0.5) / Math.Pow(this.container.ActualWidth * this.container.ActualWidth + this.container.ActualHeight * this.container.ActualHeight, 0.5);
childList[j].Fill = new SolidColorBrush(Color.FromArgb((byte)(255 * rRadio), 247, 18, 65));
x = childList[j].Data.Bounds.TopRight.X - (1 - Math.Pow(2, 0.5) / 2) * triangleLength - lastMousePosition.X;
rRadio = 1 - Math.Pow(x * x + y * y, 0.5) / Math.Pow(this.container.ActualWidth * this.container.ActualWidth + this.container.ActualHeight * this.container.ActualHeight, 0.5);
childList[i].Fill = new SolidColorBrush(Color.FromArgb((byte)(255 * rRadio), 247, 18, 65));
break;
}
}
}
}
private void UpdateLastMousePosition(object sender, MouseEventArgs e)
{
lastMousePosition = e.GetPosition(this.container);
}
private List<T> GetChildObjects<T>(System.Windows.DependencyObject obj) where T : System.Windows.FrameworkElement
{
System.Windows.DependencyObject child = null;
List<T> childList = new List<T>();
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
{
child = VisualTreeHelper.GetChild(obj, i);
if (child is T)
{
childList.Add((T)child);
}
childList.AddRange(GetChildObjects<T>(child));
}
return childList;
}
public static string MidStrEx(string sourse, string startstr, string endstr)
{
string result = string.Empty;
int startindex, endindex;
try
{
startindex = sourse.IndexOf(startstr);
if (startindex == -1)
return result;
string tmpstr = sourse.Substring(startindex + startstr.Length);
endindex = tmpstr.IndexOf(endstr);
if (endindex == -1)
return result;
result = tmpstr.Remove(endindex);
}
catch (Exception ex)
{
}
return result;
}
}
}
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