Perspective image-upload C# method -

i'm working on upload function in asp.net web application need perspective picture before save it.

ex. http://i.stack.imgur.com/yam2s.png

i know can css3 , jquery on frontend, actual picture looks when gets uploaded.

i hope of guys can me c# method under picture upload.

//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 heading close spinned image! 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;    (int y = 0; y < image.height; y++)    {       (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; } 

verify are:

using system.drawing; //and using systen.drawing.drawing2d; 

namespaces, , of course have added reference system.drawing. can play method , give distance , angle until satisfied result. can use editors, photoshop, crop result image if necessary , can use of purposes. tested @ home before posting answer , @ last worked great me. there no reasons why shouldn't work too. hope helps , match request. have fun it!