en>Monkbot: /* References */Fix CS1 deprecated date parameter errors

2014-01-27T21:57:49Z

References: Fix CS1 deprecated date parameter errors

← Older revision		Revision as of 23:57, 27 January 2014
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			'''Limnor''' is a generic-purpose codeless and [[Visual programming language\|visual]] [[Computer programming\|programming]] system. The aim is to enable [[User (computing)\|users]] to create [[computer]] [[Computer software\|software]] without directly coding in a texture [[programming language]]. It can be extended by software developers.

			__TOC__
			== Vision ==
			{{Essay-like\|section\|date=April 2010}}
			In the future most people should be able to do [[computer programming]]. Visual and codeless programming can be one of possible ways to reach that goal.

			When [[Event-driven programming\|events]] were added to [[Class (computer science)\|classes]] it enabled [[rapid application development]], especially the visual development of [[Graphical user interface\|graphic user interface]]. But event handling is still expressed via textual [[programming language]]s.

			The idea of Limnor [[Fifth-generation programming language\|codeless programming]] is to add "Actions" to [[Class (computer science)\|classes]]. Adding actions to [[Class (computer science)\|classes]] eliminates the need of textual [[programming language]]s, making generic purpose codeless and visual programming possible without sacrificing programming power.

			A [[Class (computer science)\|class]] in [[Object-oriented programming\|Object-Oriented Programming]] is defined by properties, methods and events. Now it is enhanced by actions.

			Visual programming by "properties, methods, events and actions" can be a [[fifth-generation programming language]].

			People expect [[fifth-generation programming language\|5GL]] to be easy to use, to be visual. There are many excellent [[visual programming language]]s and systems available now. One issue is that while each visual programming innovation has its unique advantages in some aspects it also has its limitations in other aspects. If different visual programming systems may work together then developers may take advantages of different systems and avoid the limitations. 5GL may solve the problem by being an abstraction layer for visual programming.

			Following criteria may define an abstraction layer for visual programming:
			* All visual programming systems can use the abstraction layer to represent their programming results.
			* Given a programming task, if visual programming system A and visual programming system B may be used to accomplish all or parts of the task then A and B may use the same representation of the abstraction layer for the parts of the task they both can accomplish.

			The first criterion requires the layer to have a wide coverage. Most programming languages, such as C/C++, Java, C#, VB, etc., meet this criterion. The first criterion does not restrict each visual programming system to have its own programming elements for unique visual representations.

			The second criterion requires the layer to be an abstraction for visual programming and makes it possible for different visual programming systems to work together.

			It can be deduced that when designing a 5GL to meet the criteria, such a 5GL should allow decorative expansions by individual visual programming systems. When the 5GL compiles/interprets a program, it ignores those decorative expansions.

			== Design ==
			An action is defined by Action-Executer, Action-Data, and Action-Condition. An action has an owner which defines the scope of data available for the action.<br>
			There are 3 types of actions:<br>
			* Method-Invoke Action. It is the execution of a method of a class. The Action-Executer is the class defining the method. The Action-Data is the values provided to the method parameters. Method return value can be assigned to a value (a property or a variable).
			* Property-Setting Action. It assigns a value to a property of a class. The Action-Executer is the class. The Action-Data is the value provided to the property.
			* Event-Firing Action. It fires an event of a class being developed. The Action-Executer is the class. The Action-Data is the values provided to the event parameters.
			Action data can be a constant, a variable, a method/event parameter, a property of a class/variable/parameter/property, or a math expression.<br>
			An Action Condition is a math expression evaluated to a Boolean value.<br>
			A math expression is a math formula with its variables linked to constants, properties, variables, parameters, and math expressions.<br>
			A math expression must be displayed and edited graphically for codeless and visual programming and for intuitive using of the programming tools. The math expression programming tool must be able to handle math elements and functions developed by third parties to enable unlimited expansions.

			== Implementation ==
			'''Limnor Studio''' is a newer implementation of codeless visual programming by "properties, methods, events and actions".<br>
			Limnor Studio implements "properties, methods, events and actions" on Microsoft .Net types. Software is developed by developing classes, just as all object-oriented programming languages do, but it is done visually. Developers derive new classes from existing classes. The existing classes are from .Net libraries made by any companies or individuals, using any programming languages or programming systems, including Limnor Studio. Limnor Studio compiler generates C# source code from visual programming representations. It uses C# compiler to generate the programming results, EXE or DLL files.<br>
			A base class for math functions provides a framework for visually display the math expressions in original math expressions in programming instead of texture formation. For example, developers do programming using formula like <math>\sqrt{(x_0-x_1)^2+(y_0-y_1)^2}</math> instead of writing something like Math.sqrt((x0-x1)(x0-x1)+(y0-y1)(y0-y1)). A math expression editor may handle math classes derived from the base math class, allowing third parties to develop new math functions to be used visually.<br>
			The developers use "action diagram" ([[flowchart]]) to form programming logics visually and intuitively.<br>
			Visual programming is better done by more than one way. Limnor Studio uses a plug-ins system to allow different visual programming systems to work together. UI designer, which represents classes in UI form and icons, is one visual programming system; object-explorer, which represents classes in tree-views, is another visual programming system. They are totally independent of each other even though they represent and work on the same class being developmented. Other independent visual programming systems can be developed and plugged in by implementing certain interfaces, for example, visual [[Dataflow\|data-flow]], visual [[Control flow\|control-flow]], [[Unified Modeling Language\|UML]], etc.

			== Features ==
			'''Limnor Studio''' Major Features:
			* Visually creation of all 3 types of Actions.
			* Action diagram (flowchart)
			* Math Expression Editor
			* Directly use of software libraries made by other .Net programming languages and programming systems
			* Development work can be directly used by other .Net programming languages and programming systems
			* Generates C# source code and Visual Studio project file from visual codeless programming representation
			* Generates HTML, JavaScript, PHP, and ASPX for web development
			* Plug-ins system for independent 5-th generation programming language tools to work on "properties, methods, events and actions"
			* Class derivation
			* Method and property overriding
			* Create properties, methods and events
			* Attribute programming
			* Polymorphism by interfaces
			* High performance 2D drawing tools
			* Database programming, Visual Query Builder, Data-binding
			* Kiosk application
			* Form Designer from Microsoft Visual Studio for GUI programming
			* Object-Explorer for viewing and working on "properties, methods, events and actions" in tree-views
			* Event-Path for viewing and working on action creation and events-actions mapping. It is a kind of control-flow programming
			* Effortlessly creation of multi-threaded action executions
			* Cloud computing
			* Web development

			==External links==
			* [http://www.limnor.com/ Limnor home page]
			* [http://www.limnor.com/index.html?Doc=studio.html Limnor Studio]
			* [http://www.limnor.com/index.html?Doc=studio_samples.html Samples]

			[[Category:Computer languages]]
			[[Category:Visual programming languages]]

en>Bibcode Bot: Adding 2 arxiv eprint(s), 0 bibcode(s) and 0 doi(s). Did it miss something? Report bugs, errors, and suggestions at User talk:Bibcode Bot

2012-08-21T07:50:23Z

Adding 2 arxiv eprint(s), 0 bibcode(s) and 0 doi(s). Did it miss something? Report bugs, errors, and suggestions at User talk:Bibcode Bot

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en>Monkbot: /* References */Fix CS1 deprecated date parameter errors

en>Bibcode Bot: Adding 2 arxiv eprint(s), 0 bibcode(s) and 0 doi(s). Did it miss something? Report bugs, errors, and suggestions at User talk:Bibcode Bot