转一个orbitpanel-白红宇

转一个orbitpanel
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发布时间：2019-06-21
本文共 6482 字，大约阅读时间需要 21 分钟。
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using Windows.Foundation;using Windows.UI.Xaml;using Windows.UI.Xaml.Controls;namespace App8{    public class orbitpanel:Panel    {        int i = 0;        public int orbitsnunber        {            get { return (int)GetValue(OrbitsProperty); }            set { SetValue(OrbitsProperty,value); }        }        public static readonly DependencyProperty OrbitsProperty = DependencyProperty.Register("orbitsnunber", typeof(int), typeof(orbitpanel), new PropertyMetadata(1, OnOrbitsChanged));        private static void OnOrbitsChanged(DependencyObject d,DependencyPropertyChangedEventArgs e){if ((int)e.NewValue < 1){throw new ArgumentException("Orbits must be greater than or equal to 1.");}}        public static int GetOrbit(DependencyObject obj)        {            return (int)obj.GetValue(OrbitProperty);        }        public static void SetOrbit(DependencyObject obj, int value)        {            obj.SetValue(OrbitProperty, value);        }        public static readonly DependencyProperty OrbitProperty =DependencyProperty.RegisterAttached("Orbit",typeof(int),typeof(orbitpanel),new PropertyMetadata(0));        protected override Size MeasureOverride(Size availableSize)        {            var sortedItems = SortElements();            double max = 0.0;            foreach (List
     
       orbitItems in sortedItems)            {                if (orbitItems.Count > 0)                {                    foreach (UIElement element in orbitItems)                    {                        element.Measure(availableSize);                        if (element.DesiredSize.Width > max)                            max = element.DesiredSize.Width;                        if (element.DesiredSize.Height > max)                            max = element.DesiredSize.Height;                    }                }            }            Size desiredSize = new Size(max * orbitsnunber * 2, max * orbitsnunber * 2);            if (double.IsInfinity(availableSize.Height) ||            double.IsInfinity(availableSize.Width))                return desiredSize;            else                return availableSize;        }        protected override Size ArrangeOverride(Size finalSize)        {            var sortedItems = SortElements();            double orbitSpacing = CalculateOrbitSpacing(finalSize);            foreach (List
      
        orbitItems in sortedItems)            {                int count = orbitItems.Count;                if (count > 0)                {                    double circumference = 2 * Math.PI * orbitSpacing * (i + 1);                    double slotSize = Math.Min(orbitSpacing, circumference / count);                    double maxSize = Math.Min(orbitSpacing, slotSize);                    double angleIncrement = 360 / count;                    double currentAngle = 0;                    Point centerPoint =                    new Point(finalSize.Width / 2, finalSize.Height / 2);                    foreach (UIElement element in orbitItems)                    {                        double angle = Math.PI / 180 * (currentAngle - 90);                        double left = orbitSpacing * (i + 1) * Math.Cos(angle);                        double top = orbitSpacing * (i + 1) * Math.Sin(angle);                        Rect finalRect = new Rect(                        centerPoint.X + left - element.DesiredSize.Width / 2,                        centerPoint.Y + top - element.DesiredSize.Height / 2,                        element.DesiredSize.Width,                        element.DesiredSize.Height);                        element.Arrange(finalRect);                        currentAngle += angleIncrement;                    }                }            }            return base.ArrangeOverride(finalSize);        }        private List
       
        [] SortElements()        {            var list = new List
        
         [orbitsnunber];            for (int i = 0; i < orbitsnunber; i++)            {                if (i == orbitsnunber - 1)                    list[i] = (from UIElement child in Children                               where GetOrbit(child) >= i                               select child).ToList
         
          ();                else                    list[i] = (from UIElement child in Children                               where GetOrbit(child) == i                               select child).ToList
          
           (); } return list; } private double CalculateOrbitSpacing(Size availableSize) { double constrainingSize = Math.Min( availableSize.Width, availableSize.Height); double space = constrainingSize / 2; return space / orbitsnunber; } }} 使用方法
<local:orbitpanel orbitsnunber="1">
</Image>
</Image>
</local:orbitpanel>
转载于:https://www.cnblogs.com/gisbeginner/archive/2012/09/12/2681886.html
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