Question

我很难在<多边形>的角上添加装饰物。当然，我想像在每个点的角落。

此Microsoft页面描述了如何使用，但是我很难理解如何使用其完整示例。谁能告诉我如何适应？

非常感谢您。

https://docs.microsoft.com/en-us/dotnet/framework/wpf/controls/adorners-overview

// Adorners must subclass the abstract base class Adorner.
public class SimpleCircleAdorner : Adorner
{
  // Be sure to call the base class constructor.
  public SimpleCircleAdorner(UIElement adornedElement)
    : base(adornedElement) 
  { 
  }

  // A common way to implement an adorner's rendering behavior is to override the OnRender
  // method, which is called by the layout system as part of a rendering pass.
  protected override void OnRender(DrawingContext drawingContext)
  {
    Rect adornedElementRect = new Rect(this.AdornedElement.DesiredSize);

    // Some arbitrary drawing implements.
    SolidColorBrush renderBrush = new SolidColorBrush(Colors.Green);
    renderBrush.Opacity = 0.2;
    Pen renderPen = new Pen(new SolidColorBrush(Colors.Navy), 1.5);
    double renderRadius = 5.0;

    // Draw a circle at each corner.
    drawingContext.DrawEllipse(renderBrush, renderPen, adornedElementRect.TopLeft, renderRadius, renderRadius);
    drawingContext.DrawEllipse(renderBrush, renderPen, adornedElementRect.TopRight, renderRadius, renderRadius);
    drawingContext.DrawEllipse(renderBrush, renderPen, adornedElementRect.BottomLeft, renderRadius, renderRadius);
    drawingContext.DrawEllipse(renderBrush, renderPen, adornedElementRect.BottomRight, renderRadius, renderRadius);
  }
}

这是将多边形添加到画布的代码。

Polygon myPolygon;
private Polygon drawPolygon()
{

    //Add the Polygon Element
    myPolygon = new Polygon();

    // Appearance
    myPolygon.Stroke = System.Windows.Media.Brushes.LightCoral;
    // Disabled for hit testing on border only.
    //myPolygon.Fill = System.Windows.Media.Brushes.Transparent;
    myPolygon.StrokeThickness = 6;

    // Alignment
    myPolygon.HorizontalAlignment = HorizontalAlignment.Left;
    myPolygon.VerticalAlignment = VerticalAlignment.Center;

    // Point Array for polyline.
    // This will come from an XML file.
    Point[] polylinePoints = {

        // START: @ TOP LEFT
        new Point(200.0F, 200.0F),

        // 1ST LINE: TOP RIGHT
        new Point(400.0F, 200.0F),
        // 2ND LINE: BOMTTOM RIGHT
        new Point(400.0F, 400.0F),
        // 3RD LINE: BOTTOM LEFT
        new Point(200.0F, 400.0F),

        // END: @ TOP LEFT
        //Not Required to close the Polygon...
        //new Point(200.0F, 200.0F),

    };

    // Load from Point[Array] polylinePoints.
    PointCollection myPointCollection = new PointCollection(polylinePoints);

    //myPointCollection.Add(Point1);

    // Add from PointCollection myPointCollection
    myPolygon.Points = myPointCollection;

    return myPolygon;

}

Answer 1

在您的代码中，您尝试实现了围绕多边形的自定义装饰器，并将“多边形”添加到“画布”面板。为此，您已经按照Microsoft页面中的说明使用了 SimpleCircleAdorner 类。我认为，在该类中，您已经通过了“画布”面板的默认大小。默认的requiredsize值为0点。

valid_input = False
while not valid_input:
    print('Enter difficulty: E - Easy, M - Medium, H - Hard')
    difficulty = input().upper()
    valid_input = difficulty in ['E', 'M', 'H']

如果要在多边形周围实现自定义装饰，则可以设置画布面板的高度和宽度，或在 OnRender 方法的此 SimpleCircleAdorner 类中正确传递点。我已经在 OnRender 方法的 SimpleCircleAdorner 类中尝试过您的多边形点，

SimpleCircleAdorner代码：

 Rect adornedElementRect = new Rect(this.AdornedElement.DesiredSize);

已加载事件：

        Point[] polylinePoints = {
            // START: @ TOP LEFT
            new Point(200.0F, 200.0F),
            // 1ST LINE: TOP RIGHT
            new Point(400.0F, 200.0F),
            // 2ND LINE: BOMTTOM RIGHT
            new Point(400.0F, 400.0F),
            // 3RD LINE: BOTTOM LEFT
            new Point(200.0F, 400.0F),
        };
        // Load from Point[Array] polylinePoints.
        PointCollection myPointCollection = new PointCollection(polylinePoints);

        // Draw a circle at each corner.
        drawingContext.DrawEllipse(renderBrush, renderPen, myPointCollection[0], renderRadius, renderRadius);
        drawingContext.DrawEllipse(renderBrush, renderPen, myPointCollection[1], renderRadius, renderRadius);
        drawingContext.DrawEllipse(renderBrush, renderPen, myPointCollection[2], renderRadius, renderRadius);
        drawingContext.DrawEllipse(renderBrush, renderPen, myPointCollection[3], renderRadius, renderRadius);

在多边形周围实施自定义装饰器

1 个答案: