ASP.NET Web PDF Document Viewer/Editor Control Library

Drawing your own forms means you take responsibility for the pixels that actually appear on the screen. This low-level approach might appeal to many F# users, because they might find that many controls that come with the WinForms library are not perfectly suited to displaying their data structures and the results of functions and algorithms. However, be warned that this approach can be time-consuming, and your time is usually better spent looking for a graphics library that abstracts some of the presentation logic. To draw a WinForm, you attach an event handler to the form s or the control s Paint event. This means every time Windows requests the form to be drawn, your function will be called. The event argument that is passed into this function has a property called Graphics, which contains an instance of a class also called Graphics. This class has methods (such as DrawLine) that allow you to draw pixels on the form. The following example shows a simple form where you draw a pie on it: #light open System.Drawing open System.Windows.Forms let brush = new SolidBrush(Color.Red) let form = let temp = new Form() temp.Resize.Add(fun _ -> temp.Invalidate()) temp.Paint.Add (fun e -> if temp.Width - 64 > 0 && temp.Height - 96 > 0 then e.Graphics.FillPie (brush, 32, 32,

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The resistance of a CdS LDR drops with light level, just like the NTC thermistor resistance changes with temperature, and for the same reason. Probably not all LDRs work this way, but you can model the resistance of the type 8P sensors with a simple equation. For the 8001, the value of K is 10,000:

Note that the resource URL and the parameters set are separated by a question mark, and firstName and middleName are separated by an ampersand: http://localhost/yourApp firstName=Adam&middleName=Christopher The server knows how to retrieve the named parameters in the URL Most modern serverside programming environments provide simple APIs, allowing easy access to the named parameters The POST method of sending named parameters to the server is nearly identical to the GET method The POST method, like the GET method, encodes the parameters as name/value pairs in the form name=value, with each name/value pair separated by an ampersand The main difference between the two is that the POST method sends the parameter string within the request body rather than appending it to the URL the way the GET method does.

temp.Width - 64, temp.Height - 64, 0, 290)) temp Application.Run(form) Figure 8-1 shows the resulting form.

Humans experience light levels over a huge range in the course of a day. Table 5-1 shows that light variation from starlight to sunlight is a variation from 0.001 to 100,000 lux. Table 5-1. Typical Light Levels

Figure 8-1. A WinForm containing a pie shape Because this image is linked to the size of the form, you must tell the form to redraw itself whenever the form is resized. You do this by attaching an event handling function to the Resize event. In this function, you call the form s Invalidate method, which tells the form that it needs to redraw itself. You ll now look at a more complete WinForms example. Imagine you want to create a form to display the Tree type defined in the next code example and displayed in Figure 8-2. // The tree type type 'a Tree = | Node of 'a Tree * 'a Tree | Leaf of 'a // The definition of the tree let tree = Node( Node( Leaf "one", Node(Leaf "two", Leaf "three")), Node( Node(Leaf "four", Leaf "five"), Leaf "six"))

The HTML usage specification technically recommends that you use the GET method when the data processing does not change a data model s state, effectively meaning that you should use the GET method when retrieving data The POST method is recommended for operations that change a data model s state, perhaps by storing or updating data or by sending an e-mail Each method has its subtle advantages Since the parameters of a GET request are encoded in the request URL, you can bookmark the URL in a browser and easily repeat the request later In the context of asynchronous requests, though, this doesn t provide much usefulness The POST request is more flexible in terms of the amount of data that can be sent to the server.

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