透视图像上传C＃方法

Question

我目前正在研究我的ASP.NET Web应用程序中的上传功能，我需要在保存之前对图片进行透视。

Ex。 http://i.stack.imgur.com/YAM2s.png

我知道我可以在前端使用CSS3和jQuery，但我希望它能成为上传时的实际图片。

我希望你们中的一些人可以帮助我用C＃方法在图片上传下做到这一点。

Answer 1

//Add new item: 
public struct Vertex 
{ 
    public double X, Y, Z; 
    public Vertex(double x, double y, double z) 
    { 
     this.X = x; 
     this.Y = y; 
     this.Z = z; 
    } 
} 
//In page's code add: 
public PointF GetPerspectiveProjectionOf(double x, double y, double z) 
{ 
    double size = 2.0 * z * Math.Tan(Math.PI/4.0); 
    return new PointF((float)(x/size + 0.5), (float)(1.0 - y/size - 0.5)); 
} 
public Image Upload(Image image, double distance, double spinInDegrees, int widthOfNewImage, int heightOfNewImage) 
{ 
    double spinInRadians = spinInDegrees * Math.PI/180.0; 
    var v1 = new Vertex((-image.Width/2.0) * Math.Cos(spinInRadians), image.Height/2.0, (-image.Width/2.0) * Math.Sin(spinInRadians)); 
    var v2 = new Vertex(-v1.X, v1.Y, -v1.Z); 
    var v3 = new Vertex(v2.X, -v2.Y, v2.Z); 
    var v4 = new Vertex(v1.X, -v1.Y, v1.Z); 
    v1.Z += distance; 
    v2.Z += distance; 
    v3.Z += distance; 
    v4.Z += distance; 
    if (v1.Z < 0.0 || v2.Z < 0.0 || v3.Z < 0.0 || v4.Z < 0.0) 
    { 
     throw new ArgumentException("You are heading too close to the spinned image! You should increase distance.", "distance"); 
    } 
    Image img = new Bitmap(widthOfNewImage, heightOfNewImage); 
    Graphics graphics = Graphics.FromImage(img); 
    graphics.SmoothingMode = SmoothingMode.AntiAlias; 
    SolidBrush sb = new SolidBrush(Color.Empty); 
    Bitmap bitmap = (Bitmap)image; 
    for (int y = 0; y < image.Height; y++) 
    { 
     for (int x = 0; x < image.Width; x++) 
     { 
      var x1 = v1.X + x * Math.Cos(spinInRadians); 
      var z1 = v1.Z + x * Math.Sin(spinInRadians); 
      var y1 = v1.Y - y; 
      var x2 = v1.X + (x + 1) * Math.Cos(spinInRadians); 
      var z2 = v1.Z + (x + 1) * Math.Sin(spinInRadians); 
      var y2 = v1.Y - y - 1; 
      var p1 = GetPerspectiveProjectionOf(x1, y1, z1); 
      var p2 = GetPerspectiveProjectionOf(x2, y1, z2); 
      var p3 = GetPerspectiveProjectionOf(x2, y2, z2); 
      var p4 = GetPerspectiveProjectionOf(x1, y2, z1); 
      p1.X *= widthOfNewImage; 
      p1.Y *= heightOfNewImage; 
      p2.X *= widthOfNewImage; 
      p2.Y *= heightOfNewImage; 
      p3.X *= widthOfNewImage; 
      p3.Y *= heightOfNewImage; 
      p4.X *= widthOfNewImage; 
      p4.Y *= heightOfNewImage; 
      sb.Color = bitmap.GetPixel(x, y); 
      graphics.FillPolygon(sb, new PointF[] { p1, p2, p3, p4 }); 
     } 
    } 
    sb.Dispose(); 
    graphics.Dispose(); 
    return img; 
} 

确认您是：

using System.Drawing; 
//AND 
using Systen.Drawing.Drawing2D; 

命名空间，当然，你已经添加引用System.Drawing中。 您可以使用此方法进行游戏并给出任意距离和角度，直到您对结果满意为止。您可以使用其他编辑器（如Photoshop）在必要时裁剪结果图像，然后将其用于任何目的。在发布这个答案之前，我在家里对它进行了测试，最后它对我很好。没有理由为什么它也不适合你。希望这有助于并符合您的要求。玩得开心！