namespace Yw.WpfUI.Hydro
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{
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/// <summary>
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/// 抽象缩放辅助类
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/// </summary>
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internal class LogicalZoomHelper
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{
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/// <summary>
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///
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/// </summary>
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public LogicalZoomHelper(HelixViewport3D viewport)
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{
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_viewport = viewport;
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}
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private readonly HelixViewport3D _viewport;//三维组件
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private readonly double _animationDuration = 0.5; // 动画持续时间(秒)
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private readonly double _zoomFactor = 1.2; // 缩放因子(在边界框外留些空间)
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/// <summary>
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/// 缩放至边界框
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/// </summary>
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public void ZoomToBounds(Rect3D bounds)
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{
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if (bounds.IsEmpty)
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{
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return;
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}
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if (!(_viewport.Camera is PerspectiveCamera camera))
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{
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return;
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}
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// 计算目标点(边界框中心)
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var target = new Point3D(
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bounds.X + bounds.SizeX / 2,
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bounds.Y + bounds.SizeY / 2,
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bounds.Z + bounds.SizeZ / 2);
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// 计算相机到目标点的距离
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double distance = CalculateOptimalDistance(bounds, camera);
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// 计算新相机位置
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Vector3D lookDirection = camera.LookDirection;
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lookDirection.Normalize();
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var newPosition = target - lookDirection * distance;
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// 创建动画
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AnimateCamera(camera, newPosition, target, _animationDuration);
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}
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/// <summary>
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/// 缩放至Visual
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/// </summary>
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public void ZoomToVisual(Visual3D visual)
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{
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if (visual == null)
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return;
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// 获取模型的边界框
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var bounds = Visual3DHelper.FindBounds(visual, Transform3D.Identity);
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ZoomToBounds(bounds);
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}
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/// <summary>
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/// 缩放至Visuals
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/// </summary>
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public void ZoomToVisuals(List<Visual3D> visuals)
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{
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if (visuals == null || visuals.Count < 1)
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{
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return;
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}
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// 计算所有模型的联合边界框
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var bounds = Rect3D.Empty;
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foreach (var visual in visuals)
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{
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bounds.Union(Visual3DHelper.FindBounds(visual, Transform3D.Identity));
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}
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ZoomToBounds(bounds);
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}
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/// <summary>
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/// 缩放至边界框(无动画)
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/// </summary>
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public void ZoomDirectToBounds(Rect3D bounds)
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{
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if (bounds.IsEmpty)
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{
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return;
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}
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if (!(_viewport.Camera is PerspectiveCamera camera))
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{
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return;
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}
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var target = new Point3D(
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bounds.X + bounds.SizeX / 2,
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bounds.Y + bounds.SizeY / 2,
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bounds.Z + bounds.SizeZ / 2);
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double distance = CalculateOptimalDistance(bounds, camera);
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Vector3D lookDirection = camera.LookDirection;
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lookDirection.Normalize();
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camera.Position = target - lookDirection * distance;
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camera.LookDirection = target - camera.Position;
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}
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/// <summary>
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/// 缩放至Visual(无动画)
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/// </summary>
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public void ZoomDirectToVisual(Visual3D visual)
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{
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if (visual == null)
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return;
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// 获取模型的边界框
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var bounds = Visual3DHelper.FindBounds(visual, Transform3D.Identity);
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ZoomDirectToBounds(bounds);
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}
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/// <summary>
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/// 缩放至Visuals(无动画)
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/// </summary>
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public void ZoomDirectToVisuals(List<Visual3D> visuals)
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{
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if (visuals == null || visuals.Count < 1)
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{
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return;
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}
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// 计算所有模型的联合边界框
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var bounds = Rect3D.Empty;
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foreach (var visual in visuals)
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{
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bounds.Union(Visual3DHelper.FindBounds(visual, Transform3D.Identity));
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}
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ZoomDirectToBounds(bounds);
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}
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//计算最佳观察距离
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private double CalculateOptimalDistance(Rect3D bounds, PerspectiveCamera camera)
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{
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// 计算边界框的对角线长度
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double diagonal = Math.Sqrt(
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bounds.SizeX * bounds.SizeX +
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bounds.SizeY * bounds.SizeY +
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bounds.SizeZ * bounds.SizeZ);
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// 根据视野角度计算所需距离
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double fov = Math.PI * camera.FieldOfView / 180.0;
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double distance = _zoomFactor * diagonal / (2 * Math.Tan(fov / 2));
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// 确保距离不为零且不小于最小距离
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return Math.Max(distance, diagonal * 0.5);
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}
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//执行相机动画
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private void AnimateCamera(PerspectiveCamera camera, Point3D newPosition, Point3D target, double duration)
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{
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// 创建位置动画
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var posAnim = new Point3DAnimation(
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camera.Position,
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newPosition,
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new Duration(TimeSpan.FromSeconds(duration)))
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{
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AccelerationRatio = 0.3,
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DecelerationRatio = 0.5,
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FillBehavior = FillBehavior.Stop
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};
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// 创建观察方向动画
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var lookAnim = new Vector3DAnimation(
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camera.LookDirection,
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target - newPosition,
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new Duration(TimeSpan.FromSeconds(duration)))
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{
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AccelerationRatio = 0.3,
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DecelerationRatio = 0.5,
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FillBehavior = FillBehavior.Stop
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};
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// 开始动画
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camera.BeginAnimation(ProjectionCamera.PositionProperty, posAnim);
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camera.BeginAnimation(ProjectionCamera.LookDirectionProperty, lookAnim);
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}
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}
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}
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