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：







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 );


}



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;


}



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。

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再次感谢您的关注，谢谢！