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--
-- File : PerspectiveView.cdl
-- Created : Wed 3 Feb 1993
-- Author : CKY / Contract Toubro-Larsen ( Niraj RANGWALA )
--
---Copyright : MATRA-DATAVISION 1993
--
class PerspectiveView from IGESDraw inherits ViewKindEntity
---Purpose: defines IGESPerspectiveView, Type <410> Form <1>
-- in package IGESDraw
--
-- Supports a perspective view.
-- Any geometric projection is defined by a view plane
-- and the projectors that pass through the view plane.
-- Projectors can be visualized as rays of light that
-- form an image by passing through the viewed object
-- and striking the view plane.
-- The projectors are defined via a point called the
-- Centre-of-Projection or the eye-point.
-- A perspective view is formed by all projectors that
-- emanate from the Centre-of-Projection and pass
-- through the view plane.
uses
TransfEntity from IGESData,
Vec from gp,
XY from gp,
XYZ from gp,
Pnt2d from gp,
Pnt from gp
raises OutOfRange
is
Create returns mutable PerspectiveView;
-- Specific Methods pertaining to the class
Init (me : mutable;
aViewNumber : Integer;
aScaleFactor : Real;
aViewNormalVector : XYZ;
aViewReferencePoint : XYZ;
aCenterOfProjection : XYZ;
aViewUpVector : XYZ;
aViewPlaneDistance : Real;
aTopLeft : XY;
aBottomRight : XY;
aDepthClip : Integer;
aBackPlaneDistance : Real;
aFrontPlaneDistance : Real);
---Purpose : This method is used to set the fields of the class
-- PerspectiveView
-- - aViewNumber : The desired view
-- - aScaleFactor : Scale factor
-- - aViewNormalVector : View plane normal vector (model space)
-- - aViewReferencePoint : View reference point (model space)
-- - aCenterOfProjection : Center Of Projection (model space)
-- - aViewUpVector : View up vector (model space)
-- - aViewPlaneDistance : View plane distance (model space)
-- - aTopLeft : Top-left point of clipping window
-- - aBottomRight : Bottom-right point of clipping window
-- - aDepthClip : Depth clipping indicator
-- - aBackPlaneDistance : Distance of back clipping plane
-- - aFrontPlaneDistance : Distance of front clipping plane
IsSingle (me) returns Boolean;
---Purpose : Returns True (for a single view)
NbViews (me) returns Integer;
---Purpose : Returns 1 (single view)
ViewItem (me; num : Integer) returns ViewKindEntity raises OutOfRange;
---Purpose : For a single view, returns <me> whatever <num>
ViewNumber (me) returns Integer;
---Purpose : returns the view number associated with <me>
ScaleFactor (me) returns Real;
---Purpose : returns the scale factor associated with <me>
ViewNormalVector (me) returns Vec;
---Purpose : returns the View plane normal vector (model space)
ViewReferencePoint (me) returns Pnt;
---Purpose : returns the View reference point (model space)
CenterOfProjection (me) returns Pnt;
---Purpose : returns the Center Of Projection (model space)
ViewUpVector (me) returns Vec;
---Purpose : returns the View up vector (model space)
ViewPlaneDistance (me) returns Real;
---Purpose : returns the View plane distance (model space)
TopLeft (me) returns Pnt2d;
---Purpose : returns the top left point of the clipping window
BottomRight (me) returns Pnt2d;
---Purpose : returns the bottom right point of the clipping window
DepthClip (me) returns Integer;
---Purpose : returns the Depth clipping indicator
-- 0 = No depth clipping
-- 1 = Back clipping plane ON
-- 2 = Front clipping plane ON
-- 3 = Back and front clipping planes ON
BackPlaneDistance (me) returns Real;
---Purpose : returns the View coordinate denoting the location of
-- the back clipping plane
FrontPlaneDistance (me) returns Real;
---Purpose : returns the View coordinate denoting the location of
-- the front clipping plane
ViewMatrix (me) returns TransfEntity;
---Purpose : returns the Transformation Matrix
ModelToView (me; coords : XYZ) returns XYZ;
---Purpose : returns XYX from the Model space to the View space by
-- applying the View Matrix
fields
--
-- Class : IGESDraw_PerspectiveView
--
-- Purpose : Declaration of the variables specific to a
-- PerspectiveView Entity.
--
-- Reminder : A PerspectiveView Entity is defined by :
-- - The desired view
-- - Scale factor
-- - View plane normal vector (model space)
-- - View reference point (model space)
-- - Center Of Projection (model space)
-- - View up vector (model space)
-- - View plane distance (model space)
-- - Top-left point of clipping window
-- - Bottom-right point of clipping window
-- - Depth clipping indicator
-- 0 = No depth clipping
-- 1 = Back clipping plane ON
-- 2 = Front clipping plane ON
-- 3 = Back and front clipping planes ON
-- - Distance of back clipping plane
-- - Distance of front clipping plane
--
theViewNumber : Integer;
theScaleFactor : Real;
theViewNormalVector : XYZ;
theViewReferencePoint : XYZ;
theCenterOfProjection : XYZ;
theViewUpVector : XYZ;
theViewPlaneDistance : Real;
theTopLeft : XY;
theBottomRight : XY;
theDepthClip : Integer;
theBackPlaneDistance : Real;
theFrontPlaneDistance : Real;
end PerspectiveView;
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