How to set up UVs for Texture borders

Question

I'm generating a plane that is able to scale without the edges of the texture being affected pixel wise. The plane needs to be able to keep its border proportion but be able to stretch to almost any size. The mesh has 8 vertices and 10 triangles to make the border. Anyway here is what I get. Ignore the numbers on the mesh geometry.

Is it possible to edit the UVs so that I get the Desired result? here's the code:

Mesh mesh = new Mesh();
    var renderer = mesh.AddRenderer();


    //create verticies

    mesh.vertices = new Vector3[] {

        //vertices in order for convienience 
        Manager.GUI.ScreenToWorldPoint(new Vector3(0f,0f,0f)),                            //0
        Manager.GUI.ScreenToWorldPoint(new Vector3(padding,padding,0)),                   //1
        Manager.GUI.ScreenToWorldPoint(new Vector3(width - padding, padding,0f)),         //2
        Manager.GUI.ScreenToWorldPoint(new Vector3(width,0f,0f)),                         //3
        Manager.GUI.ScreenToWorldPoint(new Vector3(width - padding, height - padding,0f)),//4
        Manager.GUI.ScreenToWorldPoint(new Vector3(width,height,0f)),                     //5
        Manager.GUI.ScreenToWorldPoint(new Vector3(padding, height - padding, 0f)),       //6
        Manager.GUI.ScreenToWorldPoint(new Vector3(0f,height,0f)),                        //7
    };



    //create triangles
    mesh.triangles = new int[] {
        7,5,6,
        6,5,4,
        4,5,3,
        2,4,3,
        0,2,3,
        0,1,2,
        0,7,6,
        0,6,1,
        1,6,4,
        1,4,2
};

    //create UV's uvs are in order of creation for convienience
       mesh.uv = new Vector2[] {
           new Vector2(0f,0f),
           new Vector2(padding/width, padding/height),
           new Vector2((width-padding)/width, padding/height),
           new Vector2(1f,0f),
           new Vector2((width - padding)/width,(height-padding)/height),
           new Vector2(1f,1f),
           new Vector2(padding/width,(height-padding)/height),
           new Vector2(0f,1f)





    };



    mesh.calculateNormals();
    mesh.calculateBounds();
    renderer.Texture = mytex;
    return plane;
}

Padding is the defined pixels around the the texture that ignores scaling, while height and width are the dimensions of the shape.

Answer 1

as George said, the mesh I was generating made it impossible to to scale the image without interesting. to fix the the mesh had to be remade into something that works. the code is now

Mesh mesh = new Mesh();
    var renderer = mesh.AddRenderer();
         mesh.vertices = new Vector3[] {

                //vertices in order for convienience  
                Manager.GUI.ScreenToWorldPoint(new Vector3(0f,0f,0f)),                            //0
                Manager.GUI.ScreenToWorldPoint(new Vector3(padding,0f,0f)),                      //1
                Manager.GUI.ScreenToWorldPoint(new Vector3(padding,padding,0)),                   //2
                Manager.GUI.ScreenToWorldPoint(new Vector3(width - padding, 0f,0f)),              //3
                Manager.GUI.ScreenToWorldPoint(new Vector3(width - padding, padding,0f)),         //4
                Manager.GUI.ScreenToWorldPoint(new Vector3(width,0f,0f)),                         //5
                Manager.GUI.ScreenToWorldPoint(new Vector3(width,padding,0f)),                    //6
                Manager.GUI.ScreenToWorldPoint(new Vector3(width , height - padding,0f)),         //7
                Manager.GUI.ScreenToWorldPoint(new Vector3(width - padding, height - padding,0f)),//8
                Manager.GUI.ScreenToWorldPoint(new Vector3(width,height,0f)),                     //9
                Manager.GUI.ScreenToWorldPoint(new Vector3(width - padding,height,0f)),           //10
                Manager.GUI.ScreenToWorldPoint(new Vector3(padding, height, 0f)),                 //11
                Manager.GUI.ScreenToWorldPoint(new Vector3(padding, height - padding, 0f)),       //12
                Manager.GUI.ScreenToWorldPoint(new Vector3(0f,height,0f)),                        //13
                Manager.GUI.ScreenToWorldPoint(new Vector3(0f,height - padding,0f)),              //14
                Manager.GUI.ScreenToWorldPoint(new Vector3(0f,padding,0f)),                       //15
            };



            //create triangles
            mesh.triangles = new int[] {
                15,2,0,
                1,0,2,
                1,2,4,
                1,4,3,
                3,4,6,
                3,6,5,
                4,8,7,
                4,7,6,
                8,10,9,
                8,9,7,
                12,10,8,
                12,11,10,
                14,11,12,
                14,13,11,
                15,14,12,
                15,12,2,
                2,12,8,
                2,8,4

    };

            //create UV's uvs are in order of creation for convienience
               mesh.uv = new Vector2[] {
                   new Vector2(0f,0f),   //0
                   new Vector2(padding / width, 0f), //1
                   new Vector2(padding/width, padding/height), //2
                   new Vector2((width-padding)/width, 0f), //3
                   new Vector2((width-padding)/width, padding/height), //4
                   new Vector2(1f,0f), //5
                   new Vector2(1f,padding / height), //6
                    new Vector2(1f, (height - padding) / height), //7
                   new Vector2((width - padding)/width,(height-padding)/height),//8
                   new Vector2(1f,1f), //9
                    new Vector2((width -padding)/width,1f), //10
                    new Vector2(padding/width,1f), //11
                   new Vector2(padding/width,(height-padding)/height), //12
                   new Vector2(0f,1f), //13
                   new Vector2(0f,(height - padding) / height), //14
                   new Vector2(0f,padding / height) //15





            };



            mesh.RecalculateNormals();
            mesh.RecalculateBounds();

            return plane;

hope it helps other Programmers out there