回答編集履歴
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見直しキャンペーン中
test
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@@ -1,317 +1,159 @@
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100本の棒が回転しています（これ自体に意味はない。動いてるのがわかりやすい例ってだけ）
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棒の中央あたりをクリック連打してください。
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中央あたりは常に反応するはずですが、たまに抜けるのが確認できると思います（抜けない場合は`iteration`を増やしてください。カクカクになるくらいでちょうどいいです）
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タイマーの種類はあまり関係ありません。
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`canvas.Children.Clear()`している以上、反応するかはタイミング次第ということになります。
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```x
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```xml
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<Window
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x:Class="Questions269801.MainWindow"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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Width="800"
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Height="450">
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<Canvas x:Name="canvas" MouseLeftButtonDown="canvas_MouseLeftDown" />
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</Window>
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```
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```
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```cs
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using System;
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using System.Diagnostics;
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using System.Linq;
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using System.Windows;
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using System.Windows.Input;
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using System.Windows.Media;
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using System.Windows.Shapes;
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using System.Windows.Threading;
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namespace Questions269801
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{
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public partial class MainWindow : Window
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{
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System.Threading.Timer threadingTimer;
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DispatcherTimer dispatcherTimer;
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const int iteration = 100;
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int angle;
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public MainWindow()
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{
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InitializeComponent();
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//threadingTimer = new System.Threading.Timer(new System.Threading.TimerCallback(TimerCallBack));
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//threadingTimer.Change(0, 1);
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dispatcherTimer = new DispatcherTimer { Interval = TimeSpan.FromMilliseconds(1), };
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dispatcherTimer.Tick += Timer_Tick;
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dispatcherTimer.Start();
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}
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private void Timer_Tick(object sender, EventArgs e)
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{
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angle++;
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var sin = Math.Sin(angle * (Math.PI / 180));
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var cos = Math.Cos(angle * (Math.PI / 180));
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canvas.Children.Clear();
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foreach(var i in Enumerable.Range(0, iteration))
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{
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var line = new Polyline { Stroke = Brushes.Black, StrokeThickness = 50, };
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line.Points.Add(new Point(cos * 100 + 200 + i * 100, sin * 100 + 200));
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line.Points.Add(new Point(-cos * 100 + 200 + i * 100, -sin * 100 + 200));
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canvas.Children.Add(line);
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}
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}
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void TimerCallBack(object state)
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{
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angle++;
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var sin = Math.Sin(angle * (Math.PI / 180));
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var cos = Math.Cos(angle * (Math.PI / 180));
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Dispatcher.BeginInvoke(new Action(() =>
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{
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canvas.Children.Clear();
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foreach(var i in Enumerable.Range(0, iteration))
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{
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var line = new Polyline { Stroke = Brushes.Black, StrokeThickness = 50, };
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line.Points.Add(new Point(cos * 100 + 200 + i * 100, sin * 100 + 200));
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line.Points.Add(new Point(-cos * 100 + 200 + i * 100, -sin * 100 + 200));
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canvas.Children.Add(line);
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}
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}));
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}
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private void canvas_MouseLeftDown(object sender, MouseButtonEventArgs e)
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{
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Debug.WriteLine("canvas_MouseLeftDown");
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}
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}
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}
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```
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---
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hihijijiさんが言っているように、**クリアしない手法**を考える必要があります。
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どうするかは描画内容次第ですが、今回は`RotateTransform`を使ってみました。
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クリック連打時の違いを確認してください。
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xamlは同一
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```cs
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using System;
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using System.Diagnostics;
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using System.Linq;
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using System.Windows;
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using System.Windows.Input;
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using System.Windows.Media;
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using System.Windows.Shapes;
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using System.Windows.Threading;
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namespace Questions269801
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{
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public partial class MainWindow : Window
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{
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System.Threading.Timer threadingTimer;
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DispatcherTimer dispatcherTimer;
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const int iteration = 100;
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int angle;
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public MainWindow()
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{
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InitializeComponent();
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//threadingTimer = new System.Threading.Timer(new System.Threading.TimerCallback(TimerCallBack));
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//threadingTimer.Change(0, 1);
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dispatcherTimer = new DispatcherTimer { Interval = TimeSpan.FromMilliseconds(1), };
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dispatcherTimer.Tick += Timer_Tick;
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dispatcherTimer.Start();
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angle++;
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var sin = Math.Sin(angle * (Math.PI / 180));
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var cos = Math.Cos(angle * (Math.PI / 180));
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canvas.Children.Clear();
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foreach(var i in Enumerable.Range(0, iteration))
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{
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var line = new Polyline { Stroke = Brushes.Black, StrokeThickness = 50, };
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line.Points.Add(new Point(cos * 100 + 200 + i * 100, sin * 100 + 200));
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line.Points.Add(new Point(-cos * 100 + 200 + i * 100, -sin * 100 + 200));
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line.RenderTransform = new RotateTransform
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{
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CenterX = 200 + i * 100,
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CenterY = 200,
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};
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canvas.Children.Add(line);
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}
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}
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private void Timer_Tick(object sender, EventArgs e)
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{
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angle++;
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var sin = Math.Sin(angle * (Math.PI / 180));
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var cos = Math.Cos(angle * (Math.PI / 180));
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canvas.Children.Clear();
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foreach(
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foreach(Polyline line in canvas.Children)
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{
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var
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var t = line.RenderTransform as RotateTransform;
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line.Points.Add(new Point(cos * 100 + 200 + i * 100, sin * 100 + 200));
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line.Points.Add(new Point(-cos * 100 + 200 + i * 100, -sin * 100 + 200));
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t.Angle = angle;
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}
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}
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void
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private void canvas_MouseLeftDown(object sender, MouseButtonEventArgs e)
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{
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angle++;
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var sin = Math.Sin(angle * (Math.PI / 180));
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var cos = Math.Cos(angle * (Math.PI / 180));
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Dispatcher.BeginInvoke(new Action(() =>
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{
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canvas.Children.Clear();
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Debug.WriteLine("canvas_MouseLeftDown");
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{
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var line = new Polyline { Stroke = Brushes.Black, StrokeThickness = 50, };
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line.Points.Add(new Point(cos * 100 + 200 + i * 100, sin * 100 + 200));
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line.Points.Add(new Point(-cos * 100 + 200 + i * 100, -sin * 100 + 200));
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canvas.Children.Add(line);
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}
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}));
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}
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private void canvas_MouseLeftDown(object sender, MouseButtonEventArgs e)
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{
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Debug.WriteLine("canvas_MouseLeftDown");
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}
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}
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```
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---
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hihijijiさんが言っているように、**クリアしない手法**を考える必要があります。
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186
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187
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どうするかは描画内容次第ですが、今回は`RotateTransform`を使ってみました。
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クリック連打時の違いを確認してください。
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xamlは同一
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```C#
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using System;
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using System.Diagnostics;
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using System.Linq;
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using System.Windows;
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using System.Windows.Input;
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using System.Windows.Media;
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using System.Windows.Shapes;
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using System.Windows.Threading;
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namespace Questions269801
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{
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public partial class MainWindow : Window
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{
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DispatcherTimer dispatcherTimer;
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const int iteration = 100;
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int angle;
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public MainWindow()
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{
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InitializeComponent();
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dispatcherTimer = new DispatcherTimer { Interval = TimeSpan.FromMilliseconds(1), };
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dispatcherTimer.Tick += Timer_Tick;
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dispatcherTimer.Start();
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angle++;
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var sin = Math.Sin(angle * (Math.PI / 180));
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var cos = Math.Cos(angle * (Math.PI / 180));
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canvas.Children.Clear();
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foreach(var i in Enumerable.Range(0, iteration))
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{
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var line = new Polyline { Stroke = Brushes.Black, StrokeThickness = 50, };
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262
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line.Points.Add(new Point(cos * 100 + 200 + i * 100, sin * 100 + 200));
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line.Points.Add(new Point(-cos * 100 + 200 + i * 100, -sin * 100 + 200));
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line.RenderTransform = new RotateTransform
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{
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CenterX = 200 + i * 100,
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CenterY = 200,
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};
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canvas.Children.Add(line);
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}
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}
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-
|
|
283
|
-
|
|
284
|
-
|
|
285
|
-
private void Timer_Tick(object sender, EventArgs e)
|
|
286
|
-
|
|
287
|
-
{
|
|
288
|
-
|
|
289
|
-
angle++;
|
|
290
|
-
|
|
291
|
-
foreach(Polyline line in canvas.Children)
|
|
292
|
-
|
|
293
|
-
{
|
|
294
|
-
|
|
295
|
-
var t = line.RenderTransform as RotateTransform;
|
|
296
|
-
|
|
297
|
-
t.Angle = angle;
|
|
298
|
-
|
|
299
|
-
}
|
|
300
|
-
|
|
301
|
-
}
|
|
302
|
-
|
|
303
|
-
|
|
304
|
-
|
|
305
|
-
private void canvas_MouseLeftDown(object sender, MouseButtonEventArgs e)
|
|
306
|
-
|
|
307
|
-
{
|
|
308
|
-
|
|
309
|
-
Debug.WriteLine("canvas_MouseLeftDown");
|
|
310
|
-
|
|
311
|
-
}
|
|
312
|
-
|
|
313
|
-
}
|
|
314
|
-
|
|
315
|
-
}
|
|
316
|
-
|
|
317
|
-
```
|