Class TControlPointsCurve
Unit
Declaration
type TControlPointsCurve = class(TCurve)
Description
A basic abstract class for curves determined my some set of ControlPoints. Note: it is not defined in this class any correspondence between values of T (argument for Point function) and ControlPoints.
Source: castlescript/castlecurves.pas (line 141).
Hierarchy
- TObject
- TCurve
- TControlPointsCurve
Overview
Constants
| Public | DefaultSegments = 32; |
Fields
| Public | ControlPoints: TVector3List; |
Methods
| Public | function Point(const t: Float): TVector3; virtual; abstract; |
| Public | function Point2D(const t: Float): TVector2; |
| Public | function PointOfSegment(const i, Segments: Cardinal): TVector3; |
| Public | class function LoadFromFile(const Url: String): TCurve; |
| Public | function GeometryNode(const Segments: Cardinal = DefaultSegments): TAbstractGeometryNode; |
| Protected | procedure LoadFromElement(const E: TDOMElement); override; |
| Protected | procedure SaveToStream(const Stream: TStream); override; |
| Public | function BoundingBox: TBox3D; override; |
| Public | procedure UpdateControlPoints; virtual; |
| Public | constructor Create; |
| Public | constructor CreateFromEquation(CasScriptCurve: TCasScriptCurve; ControlPointsCount: Cardinal); |
| Public | destructor Destroy; override; |
| Public | function ConvexHull: TVector3List; |
Properties
| Public | property TBegin: Single read FTBegin write FTBegin default 0; |
| Public | property TEnd: Single read FTEnd write FTEnd default 1; |
Description
Constants
| Public | DefaultSegments = 32; |
|
This item is declared in ancestor TCurve. This item has no description. | |
Fields
| Public | ControlPoints: TVector3List; |
|
This item has no description. | |
Methods
| Public | function Point(const t: Float): TVector3; virtual; abstract; |
|
This item is declared in ancestor TCurve. Curve function, for each parameter value determine the 3D point. This determines the actual shape of the curve. This is the simplest approach to calculate points on a curve. | |
| Public | function Point2D(const t: Float): TVector2; |
|
This item is declared in ancestor TCurve. This item has no description. | |
| Public | function PointOfSegment(const i, Segments: Cardinal): TVector3; |
|
This item is declared in ancestor TCurve. Curve function to work with rendered line segments begin/end points. This is simply a more specialized version of Point, it scales the argument such that you get Point(TBegin) for I = 0 and you get Point(TEnd) for I = Segments. | |
| Public | class function LoadFromFile(const Url: String): TCurve; |
|
This item is declared in ancestor TCurve. Load the first curve defined in given XML file. Hint: use https://castle-engine.io/curves_tool to design curves visually. | |
| Public | function GeometryNode(const Segments: Cardinal = DefaultSegments): TAbstractGeometryNode; |
|
This item is declared in ancestor TCurve. Represent this curve as an X3D geometry node, that you can use to visualize this. | |
| Protected | procedure LoadFromElement(const E: TDOMElement); override; |
|
This item has no description. | |
| Protected | procedure SaveToStream(const Stream: TStream); override; |
|
This item has no description. | |
| Public | function BoundingBox: TBox3D; override; |
|
Bounding box of the curve. In this class, it is simply a | |
| Public | procedure UpdateControlPoints; virtual; |
|
Always after changing ControlPoints or TBegin or TEnd and before calling Point (or anything that uses Point, like BoundingBox) call this method. It recalculates necessary things. ControlPoints.Count must be >= 2. When overriding: always call inherited first. | |
| Public | constructor Create; |
|
Constructor. | |
| Public | constructor CreateFromEquation(CasScriptCurve: TCasScriptCurve; ControlPointsCount: Cardinal); |
|
Calculate initial control points by sampling given TCasScriptCurve, with analytical curve equation. TBegin and TEnd are copied from CasScriptCurve. | |
| Public | destructor Destroy; override; |
|
This item has no description. | |
| Public | function ConvexHull: TVector3List; |
|
Calculate the convex hull. Caller is responsible for freeing the result. | |
Properties
| Public | property TBegin: Single read FTBegin write FTBegin default 0; |
|
This item is declared in ancestor TCurve.
The valid range of curve function argument. Must be | |
| Public | property TEnd: Single read FTEnd write FTEnd default 1; |
|
This item is declared in ancestor TCurve. This item has no description. | |
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