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Property summary for the Math class All of the properties for the Math class are constants. Property Description Math.E Euler’s constant and the base of natural logarithms (approximately 2.718). Math.LN2 The natural logarithm of 2 (approximately 0.693). Math.LOG2E The base 2 logarithm of e (approximately 1.442). Math.LN2 The natural logarithm of 10 (approximately 2.302). Math.LOG10E The base 10 logarithm of e (approximately 0.434). Math.PI The ratio of the circumference of a circle to its diameter (approximately 3.14159). Math.SQRT1_2 The reciprocal of the square root of 1/2 (approximately 0.707). Math.SQRT2 The square root of 2 (approximately 1.414). Math.abs() Availability Flash Player 5. In Flash Player 4, the methods and properties of the Math class are emulated using approximations and may not be as accurate as the non-emulated math functions supported by Flash Player 5. Usage Math.abs(x) Parameters x A number. Returns A number. Description Method; computes and returns an absolute value for the number specified by the parameter x. Math.acos() Availability Flash Player 5. In Flash Player 4, the methods and properties of the Math class are emulated using approximations and may not be as accurate as the non-emulated math functions supported by Flash Player 5. Usage Math.acos(x) Parameters x A number from -1.0 to 1.0. Math.acos() 447
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Use the methods and properties of this class to access and manipulate mathematical constants and functions. All of the properties and methods of the Math class are static, and must be called using the syntax Math.method(parameter) or Math.constant. In ActionScript, constants are defined with the maximum precision of double-precision IEEE-754 floating-point numbers. Several of the Math class methods take the radian of an angle as an parameter. You can use the equation below to calculate radian values, or simply pass the equation (entering a value for degrees) for the radian parameter. To calculate a radian value, use this formula: radian = Math.PI/180 * degree The following is an example of passing the equation as an parameter to calculate the sine of a 45degree angle: Math.SIN(Math.PI/180 * 45) is the same as Math.SIN(.7854) The Math class is fully supported in Flash Player 5. In Flash Player 4, you can use methods of the Math class, but they are emulated using approximations and may not be as accurate as the non- emulated math functions supported by Flash Player 5. Method summary for the Math class Method Description Math.abs() Computes an absolute value. Math.acos() Computes an arc cosine. Math.asin() Computes an arc sine. Math.atan() Computes an arc tangent. Math.atan2() Computes an angle from the x-axis to the point. Math.ceil() Rounds a number up to the nearest integer. Math.cos() Computes a cosine. Math.exp() Computes an exponential value. Math.floor() Rounds a number down to the nearest integer. Math.log() Computes a natural logarithm. Math.max() Returns the larger of the two integers. Math.min() Returns the smaller of the two integers. Math.pow() Computes x raised to the power of the y. Math.random() Returns a pseudo-random number between 0.0 and 1.0. Math.round() Rounds to the nearest integer. Math.sin() Computes a sine. Math.sqrt() Computes a square root. Math.tan() Computes a tangent. 446 Chapter 12: ActionScript Dictionary
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Include the superdomain in connectionName in the sending LocalConnection object for example, myDomain.com:myConnectionName. In the receiving object, use LocalConnection.allowDomain to specify that connections from the specified superdomain will be accepted (in this case, myDomain.com), or that connections from any domain will be accepted. Note: You cannot specify a superdomain in connectionName in the receiving LocalConnection object, only in the sending LocalConnection object. Example For an example of communicating between LocalConnection objects located in the same domain, see LocalConnection.connect(). For an example of communicating between LocalConnection objects located in any domain, see LocalConnection.allowDomain. For an example of communicating between LocalConnection objects located in specified domains, see LocalConnection.allowDomain and LocalConnection.domain(). See also LocalConnection.allowDomain, LocalConnection.connect(), LocalConnection.domain(), LocalConnection.onStatus lt (less than string specific) Availability Flash Player 4. This operator was deprecated in Flash 5 in favor of the new < (less than) operator. Usage expression1 lt expression2 Parameters expression1, expression2 Numbers, strings, or variables. Description Operator (comparison); compares expression1 to expression2 and returns true if expression1 is less than expression2; otherwise, it returns false. See also < (less than) Math class Availability Flash Player 5. In Flash Player 4, the methods and properties of the Math class are emulated using approximations and may not be as accurate as the non-emulated math functions supported by Flash Player 5. Description The Math class is a top-level class whose methods and properties you can use without using a constructor. Math class 445
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See also LocalConnection.send(), System.onStatus LocalConnection.send() Availability Flash Player 6. Usage sending_lc.send (connectionName, method [, p1,…,pN]) Parameters connectionName A string that corresponds to the connection name specified in the LocalConnection.connect() command that wants to communicate with sending_lc. method A string specifying the name of the method to be invoked in the receiving LocalConnection object. The following method names cause the command to fail: send, connect, close, domain, onStatus, and allowDomain. p1,…pN Optional parameters to be passed to the specified method. Returns A Boolean value of true if Flash can carry out the request, false otherwise. Note: A return value of true does not necessarily mean that Flash successfully connected to a receiving LocalConnection object, only that the command is syntactically correct. To determine whether the connection succeeded, see LocalConnection.onStatus. Description Method; invokes the method named method on a connection opened with the LocalConnection.connect(connectionName) command (called the receiving LocalConnection object ). The object used with this command is called the sending LocalConnection object . The SWF files that contain the sending and receiving objects must be running on the same client machine. There is a limit to the amount of data you can pass as parameters to this command. If the command returns false but your syntax is correct, try breaking up the LocalConnection.send() requests into multiple commands. As discussed in the entry LocalConnection.connect(), Flash adds the current superdomain to connectionName by default. If you are implementing communication between different domains, you need to define connectionName in both the sending and receiving LocalConnection objects in such a way that Flash does not add the current superdomain to connectionName. There are two ways you can do so: Use an underscore (_) at the beginning of connectionName in both the sending and receiving LocalConnection objects. In the SWF file containing the receiving object, use LocalConnection.allowDomain to specify that connections from any domain will be accepted. This implementation lets you store your sending and receiving SWF files in any domain. 444 Chapter 12: ActionScript Dictionary
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LocalConnection.onStatus Availability Flash Player 6. Usage sending_lc.onStatus = function(infoObject) { // your statements here } Parameters infoObject A parameter defined according to the status message. For details about this parameter, see Description, below. Returns Nothing. Description Event handler; invoked after a sending LocalConnection object tries to send a command to a receiving LocalConnection object. If you want to respond to this event handler, you must create a function to process the information object sent by the LocalConnection object. If the information object returned by this event handler contains a level value of “Status”, Flash successfully sent the command to a receiving LocalConnection object. This does not mean that Flash successfully invoked the specified method of the receiving LocalConnection object, only that Flash was able to send the command. For example, the method is not invoked if the receiving LocalConnection object doesn t allow connections from the sending domain, or if the method does not exist. The only way to know for sure if the method was invoked is to have the receiving object send a reply to the sending object. If the information object returned by this event handler contains a level value of “Error”, Flash was unable to send the command to a receiving LocalConnection object, most likely because there is no receiving LocalConnection object connected whose name corresponds to the name specified in the sending_lc.send() command that invoked this handler. In addition to this onStatus handler, Flash also provides a super function called System.onStatus. If onStatus is invoked for a particular object and there is no function assigned to respond to it, Flash processes a function assigned to System.onStatus if it exists. In most cases, you will implement this handler only to respond to error conditions, as shown in the following example. Example The following example displays information about a failed connection in the Output panel: sending_lc = new LocalConnection(); sending_lc.onStatus = function(infoObject) { if (infoObject.level == “Error”) { trace(”Connection failed.”); } } sending_lc.send(”receiving_lc”, “methodName”); LocalConnection.onStatus 443
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Line numbers are included for reference purposes. The sequence of events is as follows: The receiving SWF file prepares to receive commands on a connection named “sum” (line 11). The Flash Player resolves the name of this connection to “mydomain.com:sum” (see LocalConnection.connect()). The sending SWF file prepares to receive a reply on the LocalConnection object named “result” (line 58). It also specifies that it will accept commands only from SWF files at mydomain.com (lines 51 to 53). The sending SWF file invokes the aSum method of a connection named “mydomain.com:sum” (line 59), and passes the following parameters: its domain (lc.domain()), the name of the connection to receive the reply (”result”), and the values to be used by aSum (123 and 456). The aSum method (line 6) is invoked with the following values: sender = “mydomain.com:result”, replyMethod = “aResult”, n1 = 123, and n2 = 456. It therefore executes the following line of code: this.send(”mydomain.com:result”, “aResult”, (123 + 456)); The aResult method (line 54) displays the value returned by aSum (579). // The receiving SWF at http://www.mydomain.com/folder/movie.swf // contains the following code 1 var aLocalConnection = new LocalConnection(); 2 aLocalConnection.allowDomain = function() 3 { // Allow connections from any domain 4 return true; 5 } 6 aLocalConnection.aSum = function(sender, replyMethod, n1, n2) 7{ 8 this.send(sender, replyMethod, (n1 + n2)); 9} 10 11 aLocalConnection.connect(”sum”); // The sending SWF at http://www.yourdomain.com/folder/movie.swf // contains the following code 50 var lc = new LocalConnection(); 51 lc.allowDomain = function(aDomain) { // Allow connections only from mydomain.com 52 return (aDomain == “mydomain.com”); 53 } 54 lc.aResult = function(aParam) { 55 trace(”The sum is ” + aParam); 56 } 57 58 lc.connect(”result”); 59 lc.send(”mydomain.com:sum”, “aSum”, lc.domain() + ‘:’ + “result”, “aResult”, 123, 456); See also LocalConnection.allowDomain 442 Chapter 12: ActionScript Dictionary
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LocalConnection.domain() Availability Flash Player 6; behavior changed in Flash Player 7. Usage my_lc.domain() Parameters None. Returns A string representing the domain of the location of the current SWF file; for details, see Description, below. Description Method; returns a string representing the domain of the location of the current SWF file. In SWF files published for Flash Player 6, the returned string is the superdomain of the current SWF file. For example, if the SWF file is located at www.macromedia.com, this command returns “macromedia.com”. In SWF files published for Flash Player 7 or later, the returned string is the exact domain of the current SWF file. For example, if the SWF file is located at www.macromedia.com, this command returns “www.macromedia.com”. If the current SWF file is a local file residing on the client machine, this command returns “localhost”. The most common way to use this command is to include the domain name of the sending LocalConnection object as a parameter to the method you plan to invoke in the receiving LocalConnection object, or in conjunction with LocalConnection.allowDomain to accept commands from a specified domain. If you are enabling communication only between LocalConnection objects that are located in the same domain, you probably don t need to use this command. Example In the following example, a receiving SWF file accepts commands only from SWF files located in the same domain or at macromedia.com. my_lc = new LocalConnection(); my_lc.allowDomain = function(sendingDomain) { return (sendingDomain==this.domain() || sendingDomain==”macromedia.com”); } In the following example, a sending SWF file located at yourdomain.com invokes a method in a receiving SWF file located at mydomain.com. The sending SWF file includes its domain name as a parameter to the method it invokes, so the receiving SWF file can return a reply value to a LocalConnection object in the correct domain. The sending SWF file also specifies that it will accept commands only from SWF files at mydomain.com. LocalConnection.domain() 441
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Example The following example shows how a SWF file in a particular domain can invoke a method named Trace in a receiving SWF file in the same domain. The receiving SWF file functions as a trace window for the sending SWF file; it contains two methods that other SWF files can call Trace and Clear. Buttons pressed in the sending SWF files call these methods with specified parameters. // Receiving SWF var aLocalConnection = new LocalConnection(); aLocalConnection.Trace = function(aString) { aTextField = aTextField + aString + newline; } aLocalConnection.Clear = function() { aTextField = “”; } aLocalConnection.connect(”trace”); stop(); SWF 1 contains the following code attached to a button labeled PushMe. When you push the button, you see the sentence The button was pushed. in the receiving SWF file. on (press) { var lc = new LocalConnection(); lc.send(”trace”, “Trace”, “The button was pushed.”); delete lc; } SWF 2 contains an input text box with a var name of myText, and the following code attached to a button labeled Copy. When you type some text and then push the button, you see the text you typed in the receiving SWF file. on (press) { _parent.lc.send(”trace”, “Trace”, _parent.myText); _parent.myText = “”; } SWF 3 contains the following code attached to a button labeled Clear. When you push the button, the contents of the trace window in the receiving SWF file are cleared (erased). on (press) { var lc = new LocalConnection(); lc.send(”trace”, “Clear”); delete lc; } See also LocalConnection.send() 440 Chapter 12: ActionScript Dictionary
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LocalConnection.connect() Availability Flash Player 6. Usage receiving_lc.connect(connectionName) Parameters connectionName A string that corresponds to the connection name specified in the LocalConnection.send() command that wants to communicate with receiving_lc. Returns A Boolean value of true if no other process running on the same client machine has already issued this command using the same value for the connectionName parameter, false otherwise. Description Method; prepares a LocalConnection object to receive commands from a LocalConnection.send() command (called the sending LocalConnection object ). The object used with this command is called the receiving LocalConnection object. The receiving and sending objects must be running on the same client machine. Be sure to define the methods attached to receiving_lc before calling this method, as shown in all the examples in this section. By default, the Flash Player resolves connectionName into a value of “superdomain:connectionName”, where superdomain is the superdomain of the SWF file containing the LocalConnection.connect() command. For example, if the SWF file containing the receiving LocalConnection object is located at www.someDomain.com, connectionName resolves to “someDomain.com:connectionName”. (If a SWF file is located on the client machine, the value assigned to superdomain is “localhost”.) Also by default, the Flash Player lets the receiving LocalConnection object accept commands only from sending LocalConnection objects whose connection name also resolves into a value of “superdomain:connectionName”. In this way, Flash makes it very simple for SWF files located in the same domain to communicate with each other. If you are implementing communication only between SWF files in the same domain, specify a string for connectionName that does not begin with an underscore (_) and that does not specify a domain name (for example, “myDomain:connectionName”). Use the same string in the LocalConnection.connect(connectionName) command. If you are implementing communication between SWF files located in different domains, see the discussion of connectionName in LocalConnection.send(), and also the LocalConnection.allowDomain and LocalConnection.domain() entries. LocalConnection.connect() 439
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Description Event handler; invoked whenever receiving_lc, which is in a SWF file hosted at a domain using a secure protocol (HTTPS), receives a request to invoke a method from a sending LocalConnection object that is in a SWF file that is hosted at a nonsecure protocol. Flash expects the code you implement in this handler to return a Boolean value of true or false. If the handler doesn t return true, the request from the sending object is ignored, and the method is not invoked. By default, SWF files hosted using the HTTPS protocol can be accessed only by other SWF files hosted using the HTTPS protocol. This implementation maintains the integrity provided by the HTTPS protocol. Using this method to override the default behavior is not recommended, as it compromises HTTPS security. However, you may need to do so, for example, if you need to permit access to HTTPS files published for Flash Player 7 or later from HTTP files published for Flash Player 6. A SWF file published for Flash Player 6 can use the LocalConnection.allowDomain event handler to permit HTTP to HTTPS access. However, because security is implemented differently in Flash Player 7, you must use the LocalConnection.allowInsecureDomain() method to permit such access in SWF files published for Flash Player 7 or later. See also LocalConnection.allowDomain, LocalConnection.connect() LocalConnection.close() Availability Flash Player 6. Usage receiving_lc.close Parameters None. Returns Nothing. Description Method; closes (disconnects) a LocalConnection object. Issue this command when you no longer want the object to accept commands for example, when you want to issue a LocalConnection.connect() command using the same connectionName parameter in another SWF file. See also LocalConnection.connect() 438 Chapter 12: ActionScript Dictionary
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