Castle Game Engine: X3DFields: Class TMFDouble

# Class TMFDouble
Description | Hierarchy | Fields | Methods | Properties
## Unit X3DFields ## Declaration `type TMFDouble = class(TX3DSimpleMultField)` ## Description no description available, TX3DSimpleMultField description follows Field holding multiple values. Remember that such field may always have any number of items, including zero. Note that we keep MF fields contents in TFPSList or TCastleStringList instances (RawItems in this class, also accessible as Items (with more concrete class) in descendants). This means that they are in compact form, easy for reading, or even for feeding the list into OpenGL. That's the main reason why I did not simply implement `TX3DSimpleMultField` as a descendant of TX3DSingleFieldsList: A long list of vertexes, MFVec3f, would be kept as a list of pointers to a lot of TSFVec3f instances. This would be quite memory-consuming, and very uncomfortable for access. On the contrary, current implementation keeps all these vertexes inside one TVector3SingleList instance, that internally keeps all items in one continuos piece of memory. Descendants implementors notes: to make new descendant: In CreateUndefined you have to initialize FItemClass and create RawItems. In destructor of this class, RawItems are freed, so don't worry about this. Override RawItemsAdd. If your ItemClass doesn't work 100% correctly when it's initialized by CreateUndefined, you may have to override CreateItemBeforeParse. Fortunately, VRML specification was careful to choose as multi-valued field types' only fields that can behave nicely when initialized by CreateUndefined (and in fact VRML 2.0 removed the "bad fields" entirely). Not strictly required, but usually it's comfortable to have a constructor that allows you to init default field value from some "array of TXxx". ## Hierarchy TPersistent TNonRefCountedInterfacedPersistent TX3DFileItem TX3DFieldOrEvent TX3DField TX3DMultField TX3DSimpleMultField TMFDouble ## Overview ### Methods
| `procedure RawItemsAdd(Item: TX3DSingleField); override;`
| `constructor Create(AParentNode: TX3DFileItem; const AName: string; const InitialContent: array of Double);`
| `constructor CreateUndefined(AParentNode: TX3DFileItem; const AName: string; const AExposed: boolean); override;`
| `function EqualsDefaultValue: boolean; override;`
| `function Equals(SecondValue: TX3DField; const EqualityEpsilon: Double): boolean; override;`
| `procedure AssignLerp(const A: Double; Value1, Value2: TX3DField); override;`
| `function CanAssignLerp: boolean; override;`
| `procedure Assign(Source: TPersistent); override;`
| `procedure AssignValue(Source: TX3DField); override;`
| `procedure AssignDefaultValueFromValue; override;`
| `class function TypeName: string; override;`
| `procedure Send(const AValue: array of Double); overload;`
### Properties
| `property Items: TDoubleList read GetItems write SetItems;`
| `property ItemsSafe[Index:Integer]: Double read GetItemsSafe write SetItemsSafe;`
## Description ### Methods
| `procedure RawItemsAdd(Item: TX3DSingleField); override;`
| `constructor Create(AParentNode: TX3DFileItem; const AName: string; const InitialContent: array of Double);`
| `constructor CreateUndefined(AParentNode: TX3DFileItem; const AName: string; const AExposed: boolean); override;`
| `function EqualsDefaultValue: boolean; override;`
| `function Equals(SecondValue: TX3DField; const EqualityEpsilon: Double): boolean; override;`
| `procedure AssignLerp(const A: Double; Value1, Value2: TX3DField); override;`
| `function CanAssignLerp: boolean; override;`
| `procedure Assign(Source: TPersistent); override;`
| `procedure AssignValue(Source: TX3DField); override;`
| `procedure AssignDefaultValueFromValue; override;`
| `class function TypeName: string; override;`
| `procedure Send(const AValue: array of Double); overload;`
### Properties
| `property Items: TDoubleList read GetItems write SetItems;`
| `property ItemsSafe[Index:Integer]: Double read GetItemsSafe write SetItemsSafe;`
Access Items[] checking for range errors. In case of errors, Get will return zero, Set will do nothing, and both will produce clear OnWarning.
Generated by PasDoc 0.13.0 on 2013-08-17 21:27:15