如何快速更新 WPF 画布？

发布于 2024-10-25 22:22:06 字数 1480 浏览 2 评论 0原文

在我的 wpf 应用程序中，我想更新画布上的一条线（更改起点、终点坐标）并预览更改。问题是我添加了该行，但我只能看到初始和最终状态。

有没有办法让线条/画布实时更新？我想看看这条线是如何改变长度/位置的。

例如，我收到该线路的开始/结束对列表。如果我循环列表并使用对中的值更新线的坐标，我看不到中间状态。

我尝试将线条和画布的可见性设置为可见以强制它们更新，但它不起作用。如果我只是添加新行，我看不到它们是如何添加的，只是最后一步。

在下面的代码中，每当我有新点时，都会从循环中调用方法 DrawLine。

有什么建议吗？

public void DrawLine(List<Library2d.Point> points)
{
    PathFigure myPathFigure = new PathFigure();
    myPathFigure.StartPoint = new System.Windows.Point(points.ElementAt(0).X, points.ElementAt(0).Y);

    LineSegment myLineSegment = new LineSegment();
    myLineSegment.Point = new System.Windows.Point(points.ElementAt(1).X, points.ElementAt(1).Y);

    PathSegmentCollection myPathSegmentCollection = new PathSegmentCollection();
    myPathSegmentCollection.Add(myLineSegment);

    myPathFigure.Segments = myPathSegmentCollection;

    PathFigureCollection myPathFigureCollection = new PathFigureCollection();
    myPathFigureCollection.Add(myPathFigure);

    PathGeometry myPathGeometry = new PathGeometry();
    myPathGeometry.Figures = myPathFigureCollection;

    if (myPath == null)
    {            
    myPath = new Path();
    myPath.Stroke = Brushes.ForestGreen;
    myPath.StrokeThickness = 1;
    canvas.Children.Add(myPath);
    }

    myPath.Data = myPathGeometry;
    myPath.Visibility = Visibility.Visible;
    myPath.InvalidateMeasure();

    canvas.Visibility = Visibility.Visible;
    canvas.InvalidateMeasure();
}

原文

In my wpf app i want to update a line on the canvas(change the start, end point coordinates) and preview the change. The problem is that i add the line but i can only see the initial and final state.

Is there a way to make the line/canvas update itself in real time? I want to see how the line is changing length/position.

for example i receive a list of start/end pairs for the line. if i loop the list and update the coordinates of the line with the values from the pairs i can't see the intermediary states.

i tried to set the visibility for the line and canvas to visible to force them to update but it doesn't work. If i just add new lines, i can't see how they are added, just the final step.

In the code below the method DrawLine is called from a loop every time i have new points.

any suggestions?

public void DrawLine(List<Library2d.Point> points)
{
    PathFigure myPathFigure = new PathFigure();
    myPathFigure.StartPoint = new System.Windows.Point(points.ElementAt(0).X, points.ElementAt(0).Y);

    LineSegment myLineSegment = new LineSegment();
    myLineSegment.Point = new System.Windows.Point(points.ElementAt(1).X, points.ElementAt(1).Y);

    PathSegmentCollection myPathSegmentCollection = new PathSegmentCollection();
    myPathSegmentCollection.Add(myLineSegment);

    myPathFigure.Segments = myPathSegmentCollection;

    PathFigureCollection myPathFigureCollection = new PathFigureCollection();
    myPathFigureCollection.Add(myPathFigure);

    PathGeometry myPathGeometry = new PathGeometry();
    myPathGeometry.Figures = myPathFigureCollection;

    if (myPath == null)
    {            
    myPath = new Path();
    myPath.Stroke = Brushes.ForestGreen;
    myPath.StrokeThickness = 1;
    canvas.Children.Add(myPath);
    }

    myPath.Data = myPathGeometry;
    myPath.Visibility = Visibility.Visible;
    myPath.InvalidateMeasure();

    canvas.Visibility = Visibility.Visible;
    canvas.InvalidateMeasure();
}

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