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Various draws, access graphics, comments and relat
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Features:
The component inherits from TCustomControl, features include:
1, graphic rendering, including lines, polygon, multi-point curve, round, oval
2, notes, drawing, including drawing with point to point and point to point draw
3, graphical access: read from the file format has been defined in the file, Write file format has its own definition of the file format or bitmap format. Also available in streaming data
The access.
4, F5 for refresh surface, DELETE key will delete the currently selected graphic, F6, you can remove the fill areas.
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Delphi COM introduction to programming
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Software reuse is the goal of the industry, people have wanted to be like building blocks like "assemble" applications, role of component object acts as a building block.
So-called component object is actually good and can complete a certain predefined functionality of services or interfaces. Question is, how these components are objects and applications,
How to object to coexistence and mutual communication and interaction with other components? it's need for? a specification for these component objects work as unified standards.
COM is a binary standard, it has nothing to do with the source code. In this way, even if the COM objects created in different programming languages, and running in a different process space and different
Opera
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