ASP.NET Web PDF Document Viewer/Editor Control Library

Creates a color from its red, green, and blue components Creates a color from a member of the KnownColor enumeration Creates a color from its name in string form Creates a new font that is a generic serif font and 8 points tall Creates a new image from a file Creates a new image from a stream Creates a new icon from a file Creates a new icon from a stream Creates a pen, used to draw lines, from a color Creates a pen, used to draw lines, from a color and with a width of 2 pixels Creates a solid brush that can be used to draw filled shapes Creates a new textured brush from an image and draws a filled shape with an image mapped across it

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In the book Vehicles: Experiments in Synthetic Psychology (The MIT Press, 1986), Valentino Braitenberg wrote about the dynamic behavior of several minimalistic vehicles. Despite their simple design and control, their behavior was often complex and unexpected. Figure 5-39 shows his vehicle number 2. It has two photo sensors in the front that point forward, and two motor-driven wheels in the rear. Model 2a s control is arranged so that the brighter the light shining on a photo sensor, the faster the motor turns on the same side. Model 2b has the control signals crossed.

If you prefer to use standard objects, you can use several classes in the System.Drawing namespace that contain predefined objects. These are Brushes, Pens, SystemBrushes, SystemColors, SystemFonts, SystemIcons, and SystemPens; the following is a quick example of using these: #light open System.Drawing let myPen = Pens.Aquamarine let myFont = SystemFonts.DefaultFont

The browser-side JavaScript is again similar to previous examples but with a few added twists A utility function named createQueryString is responsible for encoding the input parameters as a query string The createQueryString function simply retrieves the input values for the first name, middle name, and birthday and appends them as name/value pairs Each name/value pair is separated by an ampersand This function returns the query string, allowing it to be reused by both the GET and POST operations Clicking the Send Parameters Using GET button calls the doRequestUsingGET function This function, like many of the previous examples, starts by calling the function that creates an instance of the XMLHttpRequest object Next, the query string that encodes the input values is created The request endpoint for this example is the servlet named GetAndPostExample.

A control is simply a class that derives from System.Windows.Forms.Control. Any class that derives from this can be displayed in a form by adding it to the Controls collection on the form object.

Figure 5-39. Braitenberg vehicles number 2a and 2b Vehicle number 2 is easy to reproduce with the NXT Quick Start Vehicle and two homebrew Light Sensors. The original NXT wheeled version is pictured in Figure 5-40, but you could also use the NXT2 Shooterbot. They can just hang down from the horizontal beam in the front, much like the feelers from 4.

The query string is created by concatenating the query string returned by the createQueryString function to the request endpoint, separated by a question mark The JavaScript continues as you ve seen before The XMLHttpRequest object s onreadystatechange property is set to use the handleStateChange function The open() method specifies that this is a GET request and the endpoint URL, which in this case contains the encoded parameters The send() method sends the request to the server, and the handleStateChange function handles the server response The handleStateChange function calls the parseResults function upon successful completion of the request The parseResults function retrieves the div element that contains the server s response and stores it in a local variable named responseDiv Any previous server results are first removed from responseDiv by using its removeChild method Finally, a new text node is created containing the server s response and is appended to responseDiv.