namespace Yw.WpfUI.Hydro
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{
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/// <summary>
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/// 抽象3D粒子
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/// </summary>
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internal class LogicalParticle3D
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{
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/// <summary>
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///
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/// </summary>
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public LogicalParticle3D(LogicalMaterialHelper materialHelper)
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{
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_materialHelper = materialHelper;
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}
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private readonly LogicalMaterialHelper _materialHelper = null;
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/// <summary>
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/// 位置
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/// </summary>
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public Point3D Position { get; set; }
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/// <summary>
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/// 流速
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/// </summary>
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public Vector3D Velocity { get; set; }
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/// <summary>
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/// 颜色
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/// </summary>
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public Color Color { get; set; }
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/// <summary>
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/// 尺寸
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/// </summary>
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public double Size { get; set; }
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/// <summary>
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/// 年龄
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/// </summary>
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public double Age { get; set; }
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/// <summary>
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/// 生命周期
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/// </summary>
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public double Lifetime { get; set; }
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/// <summary>
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/// 内容
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/// </summary>
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public GeometryModel3D Content
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{
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get
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{
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if (_content == null)
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{
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_content = new GeometryModel3D()
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{
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Material = GetMaterial(this.Color),
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Geometry = CreateGeometry(this.Size),
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Transform = CreateTransform()
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};
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}
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return _content;
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}
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}
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private GeometryModel3D _content;
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//获取材质
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private Material GetMaterial(Color color)
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{
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return _materialHelper.GetMaterial(color);
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}
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//获取材质
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private Material GetMaterial(Color color, double opacity)
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{
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return _materialHelper.GetMaterial(color, opacity);
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}
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//创建几何图形
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private MeshGeometry3D CreateGeometry(double radius)
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{
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var builder = new MeshBuilder();
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builder.AddSphere(new Point3D(0, 0, 0), radius, 12, 12);
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return builder.ToMesh();
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}
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//创建转换
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private TranslateTransform3D CreateTransform()
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{
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return new TranslateTransform3D()
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{
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OffsetX = this.Position.X,
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OffsetY = this.Position.Y,
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OffsetZ = this.Position.Z
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};
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}
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/// <summary>
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/// 更新
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/// </summary>
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public void Update()
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{
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var content = this.Content;
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double lifeRatio = this.Age / this.Lifetime;
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if (lifeRatio > 0.8)
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{
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var opacity = 1.0 - (lifeRatio - 0.8) * 5;
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content.Material = GetMaterial(this.Color, opacity);
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}
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content.Geometry = CreateGeometry(this.Size);
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var transform = content.Transform as TranslateTransform3D;
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transform.OffsetX = this.Position.X;
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transform.OffsetY = this.Position.Y;
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transform.OffsetZ = this.Position.Z;
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}
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}
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}
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