c# 3d控件（c# 3D）

本文实例讲述了C#实现3D效果的方法。分享给大家供大家参考，具体如下：

一、新建一类文件

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 private static double[] addVector(double[] a, double[] b) { return new double[] { a[0] + b[0], a[1] + b[1], a[2] + b[2] }; } private static double[] scalarProduct(double[] vector, double scalar) { return new double[] { vector[0] * scalar, vector[1] * scalar, vector[2] * scalar }; } private static double dotProduct(double[] a, double[] b) { return a[0] * b[0] + a[1] * b[1] + a[2] * b[2]; } private static double norm(double[] vector) { return Math.Sqrt(dotProduct(vector, vector)); } private static double[] normalize(double[] vector) { return scalarProduct(vector, 1.0 / norm(vector)); } private static double[] crossProduct(double[] a, double[] b) { return new double[] { (a[1] * b[2] - a[2] * b[1]), (a[2] * b[0] - a[0] * b[2]), (a[0] * b[1] - a[1] * b[0]) }; } private static double[] vectorProductIndexed(double[] v, double[] m, int i) { return new double[] { v[i + 0] * m[0] + v[i + 1] * m[4] + v[i + 2] * m[8] + v[i + 3] * m[12], v[i + 0] * m[1] + v[i + 1] * m[5] + v[i + 2] * m[9] + v[i + 3] * m[13], v[i + 0] * m[2] + v[i + 1] * m[6] + v[i + 2] * m[10]+ v[i + 3] * m[14], v[i + 0] * m[3] + v[i + 1] * m[7] + v[i + 2] * m[11]+ v[i + 3] * m[15] }; } private static double[] vectorProduct(double[] v, double[] m) { return vectorProductIndexed(v, m, 0); } private static double[] matrixProduct(double[] a, double[] b) { double[] o1 = vectorProductIndexed(a, b, 0); double[] o2 = vectorProductIndexed(a, b, 4); double[] o3 = vectorProductIndexed(a, b, 8); double[] o4 = vectorProductIndexed(a, b, 12); return new double[] { o1[0], o1[1], o1[2], o1[3], o2[0], o2[1], o2[2], o2[3], o3[0], o3[1], o3[2], o3[3], o4[0], o4[1], o4[2], o4[3] }; } private static double[] cameraTransform(double[] C, double[] A) { double[] w = normalize(addVector(C, scalarProduct(A, -1))); double[] y = new double[] { 0, 1, 0 }; double[] u = normalize(crossProduct(y, w)); double[] v = crossProduct(w, u); double[] t = scalarProduct(C, -1); return new double[] { u[0], v[0], w[0], 0, u[1], v[1], w[1], 0, u[2], v[2], w[2], 0, dotProduct(u, t), dotProduct(v, t), dotProduct(w, t), 1 }; } private static double[] viewingTransform(double fov, double n, double f) { fov *= (Math.PI / 180); double cot = 1.0 / Math.Tan(fov / 2); return new double[] { cot, 0, 0, 0, 0, cot, 0, 0, 0, 0, (f + n) / (f - n), -1, 0, 0, 2 * f * n / (f - n), 0 }; } public static Image Generate(string captchaText) { int fontsize = 24; Font font = new Font("Arial", fontsize); SizeF sizeF; using (Graphics g = Graphics.FromImage(new Bitmap(1, 1))) { sizeF = g.MeasureString(captchaText, font, 0, StringFormat.GenericDefault); } int image2d_x = (int)sizeF.Width; int image2d_y = (int)(fontsize * 1.3); Bitmap image2d = new Bitmap(image2d_x, image2d_y); Color black = Color.Black; Color white = Color.White; using (Graphics g = Graphics.FromImage(image2d)) { g.Clear(black); g.DrawString(captchaText, font, Brushes.White, 0, 0); } Random rnd = new Random(); double[] T = cameraTransform(new double[] { rnd.Next(-90, 90), -200, rnd.Next(150, 250) }, new double[] { 0, 0, 0 }); T = matrixProduct(T, viewingTransform(60, 300, 3000)); double[][] coord = new double[image2d_x * image2d_y][]; int count = 0; for (int y = 0; y < image2d_y; y += 2) { for (int x = 0; x < image2d_x; x++) { int xc = x - image2d_x / 2; int zc = y - image2d_y / 2; double yc = -(double)(image2d.GetPixel(x, y).ToArgb() & 0xff) / 256 * 4; double[] xyz = new double[] { xc, yc, zc, 1 }; xyz = vectorProduct(xyz, T); coord[count] = xyz; count++; } } int image3d_x = 256; int image3d_y = image3d_x * 9 / 16; Bitmap image3d = new Bitmap(image3d_x, image3d_y); Color fgcolor = Color.White; Color bgcolor = Color.Black; using (Graphics g = Graphics.FromImage(image3d)) { g.Clear(bgcolor); count = 0; double scale = 1.75 - (double)image2d_x / 400; for (int y = 0; y < image2d_y; y += 2) { for (int x = 0; x < image2d_x; x++) { if (x > 0) { double x0 = coord[count - 1][0] * scale + image3d_x / 2; double y0 = coord[count - 1][1] * scale + image3d_y / 2; double x1 = coord[count][0] * scale + image3d_x / 2; double y1 = coord[count][1] * scale + image3d_y / 2; g.DrawLine(new Pen(fgcolor), (float)x0, (float)y0, (float)x1, (float)y1); } count++; } } } return image3d; }

注意引用命名空间：

1	`using` `System.Drawing;`

二、页面调用

1 2	`Response.ContentType =` `"image/pjpeg";` `Captcha.Generate("我就是3D内容").Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);`

希望本文所述对大家C#程序设计有所帮助。