使用WPF实现3D场景[二]

Posted 2021-01-14 lonelyxmas

原文:使用WPF实现3D场景[二]

在上一篇的文章里我们知道如何构造一个简单的三维场景，这次的课程我将和大家一起来研究如何用代码，完成对建立好了的三维场景的观察。

首先看一下DEMO的界面：

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可以看到8个方向的按钮，它们将提供观察角度的变化和三维场景的旋转这样的功能。

观察位置变化：

实现原理：改变场景内照相机的绝对位置等属性

实现代码：

定义照相机

<Viewport3D?Name="myViewport"?Margin="0,0,0,0">
????????<Viewport3D.Camera>
??????????<PerspectiveCamera?x:Name="myViewportCamera"?FarPlaneDistance="5000"?NearPlaneDistance="0.25"?FieldOfView="90"?Position="1800,0,0"?LookDirection="-1,0,0"?UpDirection="0,1,0"></PerspectiveCamera>
????????</Viewport3D.Camera>

定义照相机（观察角度）的变化事件：

????????void?rightButton_Click(object?sender,?RoutedEventArgs?e)
????????...{
????????????this.myViewportCamera.Position?=?new?System.Windows.Media.Media3D.Point3D(this.myViewportCamera.Position.X,?this.myViewportCamera.Position.Y?,?this.myViewportCamera.Position.Z?+100);
????????}

????????void?leftButton_Click(object?sender,?RoutedEventArgs?e)
????????...{
????????????this.myViewportCamera.Position?=?new?System.Windows.Media.Media3D.Point3D(this.myViewportCamera.Position.X?,?this.myViewportCamera.Position.Y,?this.myViewportCamera.Position.Z-?100);
????????}

????????void?backButton_Click(object?sender,?RoutedEventArgs?e)
????????...{
????????????this.myViewportCamera.Position?=?new?System.Windows.Media.Media3D.Point3D(this.myViewportCamera.Position.X?+?100,?this.myViewportCamera.Position.Y,?this.myViewportCamera.Position.Z?);
????????}

????????void?frontButton_Click(object?sender,?RoutedEventArgs?e)
????????...{
????????????this.myViewportCamera.Position?=?new?System.Windows.Media.Media3D.Point3D(this.myViewportCamera.Position.X?-?100,?this.myViewportCamera.Position.Y?,?this.myViewportCamera.Position.Z?);
????????}

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三维场景角度变化：

实现原理：改变三维场景内定义的轴的角度

实现代码：

定义操作轴：

??????????<ModelVisual3D.Transform>
????????????<Transform3DGroup>
??????????????<MatrixTransform3D/>
??????????????<RotateTransform3D?>
????????????????<RotateTransform3D.Rotation?>
??????????????????<AxisAngleRotation3D?Angle="0"?Axis="0,10,0"?x:Name="myAngleRotationChair"/>
????????????????</RotateTransform3D.Rotation>
??????????????</RotateTransform3D>
??????????????<RotateTransform3D?>
????????????????<RotateTransform3D.Rotation?>
??????????????????<AxisAngleRotation3D?Angle="0"?Axis="0,0,10"?x:Name="myAngleRotationChair_1"/>
????????????????</RotateTransform3D.Rotation>
??????????????</RotateTransform3D>
????????????</Transform3DGroup>
??????????</ModelVisual3D.Transform>
????????</ModelVisual3D>

定义轴旋转代码：

?void?down_Click(object?sender,?RoutedEventArgs?e)
????????...{
????????????this.myAngleRotationChair_1.Angle?-=?10;
????????}

????????void?up_Click(object?sender,?RoutedEventArgs?e)
????????...{
????????????this.myAngleRotationChair_1.Angle?+=?10;
????????}

????????void?left_Click(object?sender,?RoutedEventArgs?e)
????????...{
????????????this.myAngleRotationChair.Angle?-=?10;
????????}

????????void?right_Click(object?sender,?RoutedEventArgs?e)
????????...{
????????????this.myAngleRotationChair.Angle?+=?10;
????????}

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好的~如果您对更多的三维场景变成想有所了解，请关注第三讲。

如果您想下载源代码或收听语音教程，请访问：微软webcast

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再次感谢您的关注，谢谢！

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