Simple .NET/ASP.NET PDF document editor web control SDK

Figure 8-2. A WinForm showing a tree structure You can draw this tree with the code in Listing 8-1. I will walk you through how the code works directly after the listing. Listing 8-1. Drawing a Tree #light open System open System.Drawing open System.Windows.Forms // The tree type type 'a Tree = | Node of 'a Tree * 'a Tree | Leaf of 'a // The definition of the tee let tree = Node( Node( Leaf "one", Node(Leaf "two", Leaf "three")), Node( Node(Leaf "four", Leaf "five"), Leaf "six")) // A function for finding the maximum depth of a tree let getDepth t = let rec getDepthInner t d = match t with | Node (l, r) -> max (getDepthInner l d + 1.0F) (getDepthInner r d + 1.0F) | Leaf x -> d getDepthInner t 0.0F

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The amount of data that can be sent using a GET request is typically a fixed amount that varies among different browsers, while the POST method can send any amount of data The HTML form element allows you to dictate the desired method by setting the element s method attribute to GET or POST The form element automatically encodes the data of its input elements according to its method attribute s rules when the form is submitted The XMLHttpRequest object does not have such built-in behavior Instead, the developer is responsible for creating the query string containing the data to be sent to the server as part of the request using JavaScript The techniques for creating the query string are identical regardless of whether you use a GET or POST request.

// Constants required for drawing the form let brush = new SolidBrush(Color.Black) let pen = new Pen(Color.Black) let font = new Font(FontFamily.GenericSerif, 8.0F) // a useful function for calculating the maximum number // of nodes at any given depth let raise2ToPower (x : float32) = Convert.ToSingle(Math.Pow(2.0, Convert.ToDouble(x))) let drawTree (g : Graphics) t = // constants that relate to the size and position // of the tree let center = g.ClipBounds.Width / 2.0F let maxWidth = 32.0F * raise2ToPower (getDepth t) // function for drawing a leaf node let drawLeaf (x : float32) (y : float32) v = let value = any_to_string v let l = g.MeasureString(value, font) g.DrawString(value, font, brush, x - (l.Width / 2.0F), y) // draw a connector between the nodes when necessary let connectNodes (x : float32) y p = match p with | Some(px, py) -> g.DrawLine(pen, px, py, x, y) | None -> () // the main function to walk the tree structure drawing the // nodes as we go let rec drawTreeInner t d w p = let x = center - (maxWidth * w) let y = d * 32.0F connectNodes x y p match t with | Node (l, r) -> g.FillPie(brush, x - 3.0F, y - 3.0F, 7.0F, 7.0F, 0.0F, 360.0F) let d = (d + 1.0F) drawTreeInner l d (w + (1.0F / d)) (Some(x, y)) drawTreeInner r d (w - (1.0F / d)) (Some(x, y)) | Leaf v -> drawLeaf x y v drawTreeInner t 0.0F 0.0F None

Table 5-1. Typical Light Levels (continued)