C# WPF画布子矩形框
是否有任何方法可以创建一个画布副本,新画布将作为第一个画布的子元素框 第一张画布 第二张画布C# WPF画布子矩形框,c#,wpf,canvas,C#,Wpf,Canvas,是否有任何方法可以创建一个画布副本,新画布将作为第一个画布的子元素框 第一张画布 第二张画布 我希望在第二个画布中显示类似的内容。您可以通过从画布派生并重写来实现这一点 您必须将更改公开,以便您复制的画布(我们称之为目标画布)可以正确更新 如果需要在源画布具有更新其属性的子级时侦听更改,那么要执行的操作相当复杂。在这种情况下,您必须再次将更改通知目标画布,这可以通过添加绑定来完成 XAML 在设计时,这是窗口: 特别注意VisualChildrenChanged=“CanvasSour
我希望在第二个画布中显示类似的内容。您可以通过从
画布
派生并重写来实现这一点
您必须将更改公开,以便您复制的画布
(我们称之为目标画布
)可以正确更新
如果需要在源画布具有更新其属性的子级时侦听更改,那么要执行的操作相当复杂。在这种情况下,您必须再次将更改通知目标画布,这可以通过添加绑定来完成
XAML
在设计时,这是窗口:
特别注意VisualChildrenChanged=“CanvasSource\u VisualChildrenChanged”
。这就是这些变化是如何公开的。我们在main窗口的代码隐藏中处理这些更改
可见的
最终结果
这是启动时的窗口。它具有目标画布中元素的副本
由于我们在初始化后2秒发生了属性更改(请参见后面的代码),因此在更改发生后,下面是一个窗口:
我小时候有一个关于台词的答案,但我想要一个更好的解决方案
Point firstPoint = new Point(DrawCanvas.ActualWidth, DrawCanvas.ActualHeight);
Point endPoint = new Point(0, 0);
foreach (Line element in DrawCanvas.Children)
{
double x = element.X1;
double y = element.Y1;
if (x < firstPoint.X)
firstPoint.X = x;
if (y < firstPoint.Y)
firstPoint.Y = y;
if (element.X2 > endPoint.X)
endPoint.X = element.X2;
if (element.Y2 > endPoint.Y)
endPoint.Y = element.Y2;
}
double offsetX = firstPoint.X - 5;
double offsetY = firstPoint.Y - 5;
var children = DrawCanvas.Children.Cast<Line>().ToArray();
DrawCanvas.Children.Clear();
Rectangle rect = new Rectangle();
rect.Stroke = new SolidColorBrush(Color.FromRgb(0, 111, 0));
rect.Fill = new SolidColorBrush(Color.FromRgb(0, 111, 111));
rect.Width = endPoint.X - offsetX + 5;
rect.Height = endPoint.Y - offsetY + 5;
Canvas.SetLeft(rect, 0);
Canvas.SetTop(rect, 0);
newCanvas.Children.Add(rect);
newCanvas.Width = rect.Width;
newCanvas.Height = rect.Height;
foreach (Line element in children)
{
Line newLine = element;
newLine.X1 = element.X1 - offsetX;
newLine.X2 = element.X2 - offsetX;
newLine.Y1 = element.Y1 - offsetY;
newLine.Y2 = element.Y2 - offsetY;
newCanvas.Children.Add(newLine);
}
pointfirstpoint=新点(DrawCanvas.ActualWidth、DrawCanvas.ActualHeight);
点端点=新点(0,0);
foreach(DrawCanvas.Children中的Line元素)
{
双x=元素X1;
双y=元素1.Y1;
如果(xendPoint.X)
端点.X=元素.X2;
if(element.Y2>endPoint.Y)
端点.Y=元素.Y2;
}
双偏移量X=第一点X-5;
双偏置=第一点Y-5;
var children=DrawCanvas.children.Cast().ToArray();
DrawCanvas.Children.Clear();
矩形rect=新矩形();
Stroke=newsolidColorBrush(Color.FromRgb(0,111,0));
rect.Fill=新的SolidColorBrush(Color.FromRgb(0,111,111));
矩形宽度=端点X-偏移量X+5;
直线高度=端点Y-偏移量+5;
Canvas.SetLeft(rect,0);
Canvas.SetTop(rect,0);
newCanvas.Children.Add(rect);
newCanvas.Width=rect.Width;
newCanvas.Height=rect.Height;
foreach(子对象中的行元素)
{
换行符=元素;
换行符.X1=元素.X1-偏移量x;
newLine.X2=element.X2-offsetX;
换行符.Y1=元素.Y1-偏移;
newLine.Y2=element.Y2-offsetY;
newCanvas.Children.Add(换行符);
}
您需要什么有点不清楚。您是否需要两张画布,但其中一张(副本)包含第一张画布中孩子的副本?这两个画布的区别是什么?画布的大小和(每个子元素的canvas.top、canvas.left)如果我可以问的话,您打算用这些画布做什么?我已经实现了一个解决方案,但对它的实际用途很好奇。我不相信你的问题有一个简单的解决方案,除非用不同的方法解决这个问题。我喜欢你的答案,但它不适合我。我想在画布上画图,然后将“画图”移到第二个画布上,但只保留我有一些元素的区域,而不是空白区域。在这些图像上,我有背景色,所以你可以了解元素的位置。
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
//Demonstrate that children added from inside the code-behind are reflected.
Rectangle newRectangle = new Rectangle() { Width = 50, Height = 50, Fill = Brushes.Orange };
CanvasSource.Children.Add(newRectangle);
Canvas.SetLeft(newRectangle, 100);
Canvas.SetTop(newRectangle, 100);
CanvasSource.PropertyChanged += CanvasSource_PropertyChanged;
//Also, demonstrate that child property changes can be seen.
DispatcherTimer timer = new DispatcherTimer() { Interval = TimeSpan.FromSeconds(2) };
timer.Tick += (sender, args) =>
{
timer.Stop();
newRectangle.Fill = Brushes.Brown;
};
timer.Start();
}
//This event handler is called when a child is added to or removed from
//the ObservableCanvas.
private void CanvasSource_VisualChildrenChanged(object sender, RoutedEventArgs e)
{
ObservableCanvas source = sender as ObservableCanvas;
if (source == null) return;
CopyElements(source);
}
//This event handler is called when a child element of the ObservableCanvas
//has a property that changes.
void CanvasSource_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
ObservableCanvas source = sender as ObservableCanvas;
if (source == null) return;
CopyElements(source);
}
//This event handler is used to ensure that the target Canvas
//has the elements copied from the source when initialized.
private void CanvasTarget_Loaded(object sender, RoutedEventArgs e)
{
CopyElements(CanvasSource);
}
//This function creates a brand new copy of the ObservableCanvas's
//children and puts it into the target Canvas.
private void CopyElements(ObservableCanvas source)
{
if (CanvasTarget == null) return;
CanvasTarget.Children.Clear(); //Start from scratch.
foreach (UIElement child in source.Children)
{
//We need to create a deep clone of the elements to they copy.
//This is necessary since we can't add the same child to two different
//UIlements.
UIElement clone = (UIElement)XamlReader.Parse(XamlWriter.Save(child));
CanvasTarget.Children.Add(clone);
}
}
}
Point firstPoint = new Point(DrawCanvas.ActualWidth, DrawCanvas.ActualHeight);
Point endPoint = new Point(0, 0);
foreach (Line element in DrawCanvas.Children)
{
double x = element.X1;
double y = element.Y1;
if (x < firstPoint.X)
firstPoint.X = x;
if (y < firstPoint.Y)
firstPoint.Y = y;
if (element.X2 > endPoint.X)
endPoint.X = element.X2;
if (element.Y2 > endPoint.Y)
endPoint.Y = element.Y2;
}
double offsetX = firstPoint.X - 5;
double offsetY = firstPoint.Y - 5;
var children = DrawCanvas.Children.Cast<Line>().ToArray();
DrawCanvas.Children.Clear();
Rectangle rect = new Rectangle();
rect.Stroke = new SolidColorBrush(Color.FromRgb(0, 111, 0));
rect.Fill = new SolidColorBrush(Color.FromRgb(0, 111, 111));
rect.Width = endPoint.X - offsetX + 5;
rect.Height = endPoint.Y - offsetY + 5;
Canvas.SetLeft(rect, 0);
Canvas.SetTop(rect, 0);
newCanvas.Children.Add(rect);
newCanvas.Width = rect.Width;
newCanvas.Height = rect.Height;
foreach (Line element in children)
{
Line newLine = element;
newLine.X1 = element.X1 - offsetX;
newLine.X2 = element.X2 - offsetX;
newLine.Y1 = element.Y1 - offsetY;
newLine.Y2 = element.Y2 - offsetY;
newCanvas.Children.Add(newLine);
}