cscの作法 その602

概要

cscの作法、調べてみた。
wpf3d、やってみた。
練習問題やってみた。

練習問題

timerで、箱を回転させよ。

写真

サンプルコード

using System;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Media;
using System.Windows.Media.Media3D;

class Main3d: Window {
	ModelVisual3D cubeModel;
	private System.Windows.Threading.DispatcherTimer timer = new System.Windows.Threading.DispatcherTimer();
	private Matrix3D matrix = Matrix3D.Identity;
	private MatrixTransform3D matrixTransform3D;
	const double AngleDelta = 5.0;
	static readonly Dictionary<string, Vector3D> Axes = new Dictionary<string, Vector3D> {
		{ "-x", Vector3D.Parse("-1,0,0") },
		{ "+x", Vector3D.Parse("1,0,0") },
		{ "-y", Vector3D.Parse("0,-1,0") },
		{ "+y", Vector3D.Parse("0,1,0") },
		{ "-z", Vector3D.Parse("0,0,-1") },
		{ "+z", Vector3D.Parse("0,0,1") },
	};
	public Main3d() {
		var point0 = new Point3D(0, -0.2, -0.2);
		var point1 = new Point3D(0.2, -0.2, -0.2);
		var point2 = new Point3D(0.2, -0.2, 0.2);
		var point3 = new Point3D(0, -0.2, 0.2);
		var point4 = new Point3D(0, 0.2, -0.2);
		var point5 = new Point3D(0.2, 0.2, -0.2);
		var point6 = new Point3D(0.2, 0.2, 0.2);
		var point7 = new Point3D(0, 0.2, 0.2);
		var cubeGroup = new Model3DGroup();
		var cubeMaterial = new DiffuseMaterial(new SolidColorBrush(Colors.Blue));
		cubeGroup.Children.Add(new GeometryModel3D(CreateMesh(point7, point6, point2, point3), cubeMaterial));
		cubeGroup.Children.Add(new GeometryModel3D(CreateMesh(point6, point5, point1, point2), cubeMaterial));
		cubeGroup.Children.Add(new GeometryModel3D(CreateMesh(point5, point4, point0, point1), cubeMaterial));
		cubeGroup.Children.Add(new GeometryModel3D(CreateMesh(point4, point7, point3, point0), cubeMaterial));
		cubeGroup.Children.Add(new GeometryModel3D(CreateMesh(point1, point0, point3, point2), cubeMaterial));
		cubeGroup.Children.Add(new GeometryModel3D(CreateMesh(point4, point5, point6, point7), cubeMaterial));
		cubeModel = new ModelVisual3D();
		cubeModel.Content = cubeGroup;
		var trans = new Transform3DGroup();
		trans.Children.Add(new RotateTransform3D());
		trans.Children.Add(new TranslateTransform3D(-1, 1, -1));
		cubeModel.Transform = trans;
		var light = new DirectionalLight();
		var cam = new PerspectiveCamera();
		cam.Position = new Point3D(0, 0, 2);
		var vp3d = new Viewport3D();
		vp3d.Camera = cam;
		vp3d.Children.Add(cubeModel);
		vp3d.Children.Add(new ModelVisual3D() {
			Content = light
		});
		Width = 400;
		Height = 400;
		Content = vp3d;
		timer.Interval = TimeSpan.FromMilliseconds(100);
		timer.Tick += TimerOnTick;
		timer.Start();
	}
	private void TimerOnTick(Object sender, EventArgs args) {
		matrix.Rotate(new Quaternion(Axes["-z"], AngleDelta));
		matrix.Rotate(new Quaternion(Axes["-y"], AngleDelta));
		matrixTransform3D = new MatrixTransform3D(matrix);
		//Console.WriteLine("ok");
		cubeModel.Transform = matrixTransform3D;
	}
	private static MeshGeometry3D CreateMesh(Point3D p0, Point3D p1, Point3D p2, Point3D p3) {
		var mesh = new MeshGeometry3D();
		mesh.Positions = new Point3DCollection(new Point3D[] {
			p0,
			p1,
			p2,
			p3
		});
		mesh.TriangleIndices = new Int32Collection(new int[] {
			0,
			2,
			1,
			0,
			3,
			2
		});
		mesh.TextureCoordinates = new PointCollection(new Point[] {
			new Point(0, 0),
			new Point(1, 0),
			new Point(1, 1),
			new Point(0, 1)
		});
		return mesh;
	}
	[STAThread]
	static void Main() {
		var wnd = new Main3d();
		wnd.ShowDialog();
	}
}

以上。