Есть сфера. На сфере нужно нарисовать линию и поворачивать её вместе со сферой с помощью мыши. Как это сделать? Как привязать линию к сфере? Сейчас все рисуется вот так вот: | Код |
<Window x:Class="WpfApplication8.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:my="clr-namespace:Primitive3DSurfaces;assembly=Primitive3DSurfaces"
Title="tst WPF3D" Height="344" Width="510">
<Grid Name="myGrid">
<Grid.Background>
<LinearGradientBrush StartPoint="1,1" EndPoint="0,0">
<LinearGradientBrush.GradientStops>
<GradientStop Color="Black" Offset="0"/>
</LinearGradientBrush.GradientStops>
</LinearGradientBrush>
</Grid.Background>
<Viewport3D Grid.Column="0" Grid.Row="0">
<Viewport3D.Camera>
<PerspectiveCamera Position="0,0,-8"
UpDirection="0,1,0" LookDirection="0,0,1"
FieldOfView="30" NearPlaneDistance="0.125"/>
</Viewport3D.Camera>
<Viewport3D.Children>
<ModelVisual3D>
<ModelVisual3D.Content>
<DirectionalLight Color="White" Direction="0,0,1" />
</ModelVisual3D.Content>
</ModelVisual3D>
<ModelVisual3D>
<my:Sphere3D>
<ModelVisual3D.Transform>
<Transform3DGroup>
<Transform3DGroup.Children>
<RotateTransform3D x:Name="myHorizontalRTransform">
<RotateTransform3D.Rotation>
<AxisAngleRotation3D x:Name="myHorizontalRotation" Angle="270" Axis="10 3 0" />
</RotateTransform3D.Rotation>
</RotateTransform3D>
<RotateTransform3D x:Name="myVerticalRTransform">
<RotateTransform3D.Rotation>
<AxisAngleRotation3D x:Name="myVerticalRotation" Angle="19" Axis="1 0 0" />
</RotateTransform3D.Rotation>
</RotateTransform3D>
<TranslateTransform3D x:Name="myTranslateTransform" OffsetX="0" OffsetY="0" OffsetZ="0" />
</Transform3DGroup.Children>
</Transform3DGroup>
</ModelVisual3D.Transform>
<my:Sphere3D.Material>
<DiffuseMaterial>
<DiffuseMaterial.Brush>
<ImageBrush ImageSource="/WpfApplication8;component/Images/Untitled.jpg" />
</DiffuseMaterial.Brush>
</DiffuseMaterial>
</my:Sphere3D.Material>
</my:Sphere3D>
</ModelVisual3D>
</Viewport3D.Children>
</Viewport3D>
</Grid>
</Window>
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| Код |
namespace Primitive3DSurfaces
{
public abstract class Primitive3D : ModelVisual3D
{
//<1>
internal abstract Geometry3D Tessellate();
//<2>
internal readonly GeometryModel3D _content
= new GeometryModel3D();
//<3>
public Primitive3D()
{
Content = _content;
_content.Geometry = Tessellate();
}
//<4-1>
public static DependencyProperty MaterialProperty =
DependencyProperty.Register(
"Material",
typeof(Material),
typeof(Primitive3D),
new PropertyMetadata(null,
new PropertyChangedCallback(OnMaterialChanged)));
//<4-2>
public Material Material
{
get { return (Material)GetValue(MaterialProperty); }
set { SetValue(MaterialProperty, value); }
}
//<5>
internal static void OnMaterialChanged(Object sender,
DependencyPropertyChangedEventArgs e)
{
Primitive3D p = ((Primitive3D)sender);
p._content.Material = p.Material;
}
//<6>
internal static void OnGeometryChanged(DependencyObject d)
{
Primitive3D p = ((Primitive3D)d);
p._content.Geometry = p.Tessellate();
}
//<7>
internal double DegToRad(double degrees)
{
return (degrees / 180.0) * Math.PI;
}
}
}
|
| Код |
namespace Primitive3DSurfaces
{
public sealed class Sphere3D : Primitive3D
{
public MeshGeometry3D mesh = new MeshGeometry3D();
internal Point3D GetPosition(double t, double y)
{
double r = Math.Sqrt(1 - y * y);
double x = r * Math.Cos(t);
double z = r * Math.Sin(t);
return new Point3D(x, y, z);
}
private Vector3D GetNormal(double t, double y)
{
return (Vector3D)GetPosition(t, y);
}
private Point GetTextureCoordinate(double t, double y)
{
Matrix TYtoUV = new Matrix();
TYtoUV.Scale(1 / (2 * Math.PI), -0.5);
Point p = new Point(t, y);
p = p * TYtoUV;
return p;
}
internal override Geometry3D Tessellate()
{
int tDiv = 32;
int yDiv = 32;
double maxTheta = DegToRad(360.0);
double minY = -1.0;
double maxY = 1.0;
double dt = maxTheta / tDiv;
double dy = (maxY - minY) / yDiv;
for (int yi = 0; yi <= yDiv; yi++)
{
double y = minY + yi * dy;
for (int ti = 0; ti <= tDiv; ti++)
{
double t = ti * dt;
mesh.Positions.Add(GetPosition(t, y));
mesh.Normals.Add(GetNormal(t, y));
mesh.TextureCoordinates.Add(GetTextureCoordinate(t, y));
}
}
for (int yi = 0; yi < yDiv; yi++)
{
for (int ti = 0; ti < tDiv; ti++)
{
int x0 = ti;
int x1 = (ti + 1);
int y0 = yi * (tDiv + 1);
int y1 = (yi + 1) * (tDiv + 1);
mesh.TriangleIndices.Add(x0 + y0);
mesh.TriangleIndices.Add(x0 + y1);
mesh.TriangleIndices.Add(x1 + y0);
mesh.TriangleIndices.Add(x1 + y0);
mesh.TriangleIndices.Add(x0 + y1);
mesh.TriangleIndices.Add(x1 + y1);
}
}
mesh.Freeze();
return mesh;
}
}
}
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Как привязать линию к сфере, Как привязать линию к сфере 
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