An IDLgrBuffer object is an in-memory, off-screen destination object. Object trees can be drawn to instances of the IDLgrBuffer object and the resulting image can be retrieved from the buffer using the Read() method. The off-screen representation avoids dithering artifacts by providing a full-resolution buffer for objects using either the RGB or Color Index color models.

Note: Objects or subclasses of this type can not be saved or restored.

Superclasses

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IDLitComponent

Creation

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See IDLgrBuffer::Init.

Properties

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Objects of this class have the following properties. See IDLgrBuffer Properties for details on individual properties.

• ALL
• COLOR_MODEL
• DIMENSIONS
• FONT_SCALE
• GRAPHICS_TREE
• IMAGE_DATA
• LINE_QUALITY
• N_COLORS
• PALETTE
• QUALITY
• REGISTER_PROPERTIES
• RESOLUTION
• SCREEN_DIMENSIONS
• UNITS
• ZBUFFER_DATA

In addition, objects of this class inherit the properties of all superclasses of this class.

Methods

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This class has the following methods:

• IDLgrBuffer::Cleanup
• IDLgrBuffer::Draw
• IDLgrBuffer::Erase
• IDLgrBuffer::GetContiguousPixels
• IDLgrBuffer::GetDeviceInfo
• IDLgrBuffer::GetFontnames
• IDLgrBuffer::GetProperty
• IDLgrBuffer::GetTextDimensions
• IDLgrBuffer::Init
• IDLgrBuffer::PickData
• IDLgrBuffer::QueryRequiredTiles
• IDLgrBuffer::Read
• IDLgrBuffer::Select
• IDLgrBuffer::SetProperty

In addition, this class inherits the methods of its superclasses (if any).

Version History

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5.0	Introduced
6.2	Added QueryRequiredTiles method
8.2	Added LINE_QUALITY property