WPF で雪を降らせてみた

Let it snow.

 

<Window x:Class=”SnowFall.Window1″ Background=”Black” Title=”SnowFall” Width=”400″ Height=”300″ xmlns=”http://schemas.microsoft.com/winfx/2006/xaml/presentation” xmlns:x=”http://schemas.microsoft.com/winfx/2006/xaml” xmlns:d=”http://schemas.microsoft.com/expression/interactivedesigner/2006″ xmlns:c=”http://schemas.openxmlformats.org/markup-compatibility/2006″ c:Ignorable=”d” Loaded=”Window_Loaded”>
    <Grid>
        <Viewport3D x:Name=”ZAM3DViewport3D” ClipToBounds=”true” >
            <Viewport3D.Effect>
                <BlurEffect Radius=”10″></BlurEffect>
            </Viewport3D.Effect>
            <Viewport3D.Camera>
                <PerspectiveCamera x:Name=”Target_CameraOR6″ FarPlaneDistance=”100″ LookDirection=”0,2,-1″ UpDirection=”0,1,0″ NearPlaneDistance=”0.1″ Position=”0,-5,5″ FieldOfView=”50″ />
            </Viewport3D.Camera>

            <ModelVisual3D>
                <ModelVisual3D.Content>
                    <Model3DGroup x:Name=”Scene” >
                        <AmbientLight Color=”#7777FF” />
                        <DirectionalLight Color=”#FFFFFF” Direction=”-0.612372,-0.5,-0.612372″ />
                        <DirectionalLight Color=”#FFFFFF” Direction=”0.612372,-0.5,-0.612372″ />
                        <Model3DGroup x:Name=”Model3DG” />
                    </Model3DGroup>
                </ModelVisual3D.Content>
            </ModelVisual3D>
        </Viewport3D>
    </Grid>
</Window>

C# Code

using System;
using System.Windows;
using System.Windows.Media.Media3D;
using System.Windows.Media.Animation;
using System.Windows.Media;
using System.Windows.Markup;

namespace SnowFall
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>

    public partial class Window1 : System.Windows.Window
    {
        private const int maxSnow = 1000;

        public Window1()
        {
            InitializeComponent();
        }

        Snow[] snow = new Snow[maxSnow];

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            CreateSnow();
        }

        private void CreateSnow()
        {
            for (int i = 0; i < maxSnow; i++)
            {
                snow[i] = SnowFactory.CreateSnowBall(Colors.White, 0.2);

                this.Model3DG.Children.Add(snow[i].snowBall);

                snow[i].BeginAnimation();
            }
        }
    }

    public class Snow
    {
        public GeometryModel3D snowBall = new GeometryModel3D();

        public DoubleAnimationUsingKeyFrames daukf = new DoubleAnimationUsingKeyFrames();

        public Snow()
        {
            snowBall.Geometry = GetBall();
            snowBall.Transform = GetTransform(0.1);
            snowBall.Material = new DiffuseMaterial(new SolidColorBrush(Colors.White));

            daukf = CreateAnimation();
        }

        public Snow(Color col, double size)
        {
            snowBall.Geometry = GetBall();
            snowBall.Transform = GetTransform(size);
            snowBall.Material = new DiffuseMaterial(new SolidColorBrush(col));

            daukf = CreateAnimation();
        }

        public void BeginAnimation()
        {
            t2.BeginAnimation(TranslateTransform3D.OffsetYProperty, daukf);
        }

        public TranslateTransform3D t2 { get; set; }

        private Transform3DGroup GetTransform(double size)
        {
            Transform3DGroup t3dg = new Transform3DGroup();
            ScaleTransform3D s01 = new ScaleTransform3D(size, size, size);
            RotateTransform3D r01 = new RotateTransform3D();
            TranslateTransform3D t1 = new TranslateTransform3D(GetRnd(50) -25, 25, GetRnd(50) – 25);
            t2 = new TranslateTransform3D(0, 0, 0);

            t3dg.Children.Add(t1);
            t3dg.Children.Add(s01);
            t3dg.Children.Add(r01);
            t3dg.Children.Add(t2);

            return t3dg;
        }

        private static MeshGeometry3D GetBall()
        {
            MeshGeometry3D ball = new MeshGeometry3D();
            ball.TriangleIndices = new Int32Collection { 0, 1, 2, 3, 0, 2,…..240, 226 };
            ball.Normals = new Vector3DCollection { new Vector3D(0.18024, 0.980785, 0.0746578), …., new Vector3D(0, -1, 0) };
            ball.Positions = new Point3DCollection { new Point3D(0.09012, 0.490393, 0.0373289), … new Point3D(0, -0.5, 0) };
            return ball;
        }

        LinearDoubleKeyFrame ldkf1 = new LinearDoubleKeyFrame();
        LinearDoubleKeyFrame ldkf2 = new LinearDoubleKeyFrame();

        private DoubleAnimationUsingKeyFrames CreateAnimation()
        {
            ldkf1.KeyTime = KeyTime.FromTimeSpan(new TimeSpan(0, 0, 0));
            ldkf1.Value = 20;

            ldkf2.KeyTime = KeyTime.FromTimeSpan(new TimeSpan(0, 0, 5));
            ldkf2.Value = -10;

            daukf.KeyFrames.Add(ldkf1);
            daukf.KeyFrames.Add(ldkf2);
            daukf.BeginTime = new TimeSpan(0, 0, 0, 0, (int)GetRnd(5000));
            daukf.Duration = new TimeSpan(0, 0, 0, 5);
            daukf.RepeatBehavior = RepeatBehavior.Forever;

            return daukf;
        }

        Random rnd = new Random();
        double GetRnd(double range)
        {
            return (rnd.NextDouble() * range);
        }
    }

    public class SnowFactory
    {
        public static Snow CreateSnowBall()
        {
            Snow snow = new Snow();
            return snow;
        }

        public static Snow CreateSnowBall(Color col, double size)
        {
            Snow snow = new Snow(col, size);
            return snow;
        }
    }
}

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