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更改WPF中的选择“样式”

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serhio · 技术社区 · 15 年前

我在WPF应用程序中有一个带有一些行的图表。

当用户选择该行(鼠标)时,我需要更改其外观。 La:

在WPF中,两行代码可以如下所示:

行 x1=“10”y1=“20”x2=“150”y2=“20” stroke=“black”strokethickness=“1”/> 直线;直线 x1=“10”y1=“50”x2=“150”y2=“50” stroke=“blue”strokethickness=“3”/> 多边形 points=“80,45 80,55 90,50” stroke=“blue”fill=“blue”/> < /代码>

当用户选择对象(线条)时,如何更改线条“样式”?
是否可以将“箭头”保持在段的中间?

当用户选择该行(鼠标)时,我需要更改其外观。洛杉矶:

alt text

在WPF中,两行代码可以如下所示:

        <Line
            X1= "10" Y1="20" X2="150" Y2="20"
            Stroke="Black" StrokeThickness="1" />

        <Line
            X1= "10" Y1="50" X2="150" Y2="50"
            Stroke="Blue" StrokeThickness="3" />  
        <Polygon 
            Points="80,45 80,55 90,50" 
            Stroke="Blue" Fill="Blue" />

当用户选择对象(线条)时,如何更改线条“样式”?
是否可以将“箭头”保持在段的中间?

3 回复 | 直到 15 年前

1

3

Holstebroe 15 年前

   public class Arrow : Shape
    {

        public static readonly DependencyProperty X1Property = DependencyProperty.Register("X1", typeof(double), typeof(Arrow), new FrameworkPropertyMetadata(0.0, FrameworkPropertyMetadataOptions.AffectsRender | FrameworkPropertyMetadataOptions.AffectsMeasure));

        [TypeConverter(typeof(LengthConverter))]
        public double X1
        {
        get { return (double)base.GetValue(X1Property); }
        set { base.SetValue(X1Property, value); }
        }

        // TODO: Replace with dependency properties
        [TypeConverter(typeof(LengthConverter))]
        public double X2 { get; set; }

        [TypeConverter(typeof(LengthConverter))]
        public double Y1 { get; set; }

        [TypeConverter(typeof(LengthConverter))]
        public double Y2 { get; set; }

        [TypeConverter(typeof(LengthConverter))]
        public double ArrowWidth { get; set; }

        [TypeConverter(typeof(LengthConverter))]
        public double ArrowLength { get; set; }



        protected override Geometry DefiningGeometry
        {
            get 
            { 
                var geometryGroup = new GeometryGroup();

                // Add arrow head
                var midPoint = new Point((X1 + X2) / 2.0, (Y1 + Y2) / 2.0);
                double dX = (X2 - X1);
                double dY = (Y2 - Y1);
                double length = Math.Sqrt(dX*dX + dY*dY);
                dX /= length;
                dY /= length;
                var myPathSegmentCollection = new PathSegmentCollection 
                    {
                        new LineSegment {Point = new Point(midPoint.X - dX * ArrowLength + dY * ArrowWidth/2.0, midPoint.Y - dY * ArrowLength - dX * ArrowWidth/2.0)},
                        new LineSegment {Point = new Point(midPoint.X - dX * ArrowLength - dY * ArrowWidth/2.0, midPoint.Y - dY * ArrowLength + dX * ArrowWidth/2.0)},
                        new LineSegment {Point = midPoint},
                    };
                var myPathFigure = new PathFigure {StartPoint = midPoint, Segments = myPathSegmentCollection};

                var myPathFigureCollection = new PathFigureCollection {myPathFigure};

                var myPathGeometry = new PathGeometry {Figures = myPathFigureCollection};
                geometryGroup.Children.Add(myPathGeometry);
                // Add line
                geometryGroup.Children.Add(new LineGeometry(new Point(X1, Y1), new Point(X2, Y2)));
                return geometryGroup;
            }
        }
    }

2

Wonko the Sane 15 年前

3

0

MajorRefactoring 15 年前

private void Line_MouseDown( object sender, MouseButtonEventArgs e )
{
    ( (Line)sender ).Stroke = Brushes.Blue;
}