[occt.git] / src / Graphic2d / Graphic2d_Buffer.cdl

-- Created by: s:	CAL, GG
-- Copyright (c) 1995-1999 Matra Datavision
-- Copyright (c) 1999-2012 OPEN CASCADE SAS
--
-- The content of this file is subject to the Open CASCADE Technology Public
-- License Version 6.5 (the "License"). You may not use the content of this file
-- except in compliance with the License. Please obtain a copy of the License
-- at http://www.opencascade.org and read it completely before using this file.
--
-- The Initial Developer of the Original Code is Open CASCADE S.A.S., having its
-- main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France.
--
-- The Original Code and all software distributed under the License is
-- distributed on an "AS IS" basis, without warranty of any kind, and the
-- Initial Developer hereby disclaims all such warranties, including without
-- limitation, any warranties of merchantability, fitness for a particular
-- purpose or non-infringement. Please see the License for the specific terms
-- and conditions governing the rights and limitations under the License.


class Buffer from Graphic2d inherits TShared from MMgt

    	---Purpose: This class constructs a 2D graphic buffer in a view.   It
    	-- manages a set of graphic objects and/or primitives.
    	-- To draw the buffer, the following elements are required:
    	-- -   the override color
    	-- -   the font
    	-- -   a solid line type
    	-- -   thickness of 1 pixel.
    	-- With this category , the user can drag the geometry
    	-- stored in the buffer without changing the fixed
    	-- background.   This mechanism is reserved for the
    	-- special driver Aspect_WindowDriver:   if no other
    	-- driver has been defined, nothing will be drawn.   Both
    	-- this driver and view mapping are used to draw the buffer.
    	-- Warning
    	-- -   This class manages dragging only.   It does not
    	--   manage "sketching" or "rubberbanding".   For example:
    	--   -   There is no empty constructor for this
    	--    primitive.   Therefore we must create a primitive
    	--    in a dummy object simply to add this primitive to the buffer.
    	--   -   There is no Buffer->Add (anArrayOfPoints)
    	--    method.   Therefor it is not possible to add
    	--    shapes to the buffer.
    	--   -   There are no Polyline->ChangeApoint () nor
    	--    Circle->ChangeRadius () methods.   Therefore
    	--    we must call the primitive's destructor to modify
    	--    the definition of one primitive in a buffer.
    	-- -   The Graphic2d_Image class is a primitive.   For
    	--   this class, we replace the definition of the image
    	--   with a rectangle with the same size and the same position.
    	-- -   You can add or remove primitives to the buffer
    	--   after creating and displaying it again.
        
        
uses
	PlaneAngle		from Quantity,
	Factor			from Quantity,
	Length			from Quantity,

	View			from Graphic2d,
	Drawer			from Graphic2d,
	ViewPtr			from Graphic2d,
	Primitive		from Graphic2d,
	SequenceOfPrimitives	from Graphic2d,
	GraphicObject		from Graphic2d,
	SequenceOfGraphicObject from Graphic2d,
	ViewMapping 		from Graphic2d,
	WindowDriver		from Aspect,
	TypeOfDrawMode		from Aspect

is
	-------------------------
	-- Category: Constructors
	-------------------------

	Create (aView: View from Graphic2d;
		aPivotX, aPivotY: Length from Quantity;
		aWidthIndex: Integer from Standard = 0;
		aColorIndex: Integer from Standard = 0;
		aFontIndex: Integer from Standard = 0;
		aDrawMode: TypeOfDrawMode from Aspect = Aspect_TODM_REPLACE)
	returns mutable Buffer from Graphic2d;
	---Purpose:	Creates an empty graphic buffer in the view <aView>.
	--		A graphic buffer manages a set of graphic objects
	--		and/or primitives.
	--		A buffer color and font index can be defined,
	--		in place of the default overrideColor or systemFont.
	--		When the drawmode is REPLACE the buffer is drawn with
	--		the right color and background drawing is used for 
	--		restoring it at Erase() time.
	--		When the drawmode is XOR the buffer is drawn or erase
	--		with an optimal color depending of the background color
	--		but some side effects can appears depending of
	--		background drawing pixels values.
	---Category:	Constructors

	------------------------
	-- Category: Destructors
	------------------------

	Destroy (me: mutable)
	is static;
	---Level:	Public
	---Purpose:	Deletes the graphic buffer <me>.
	---C++:		alias ~
	---Category:	Destructors

	---------------------------------------------------------
	-- Category: Methods to manage the contents of the buffer
	---------------------------------------------------------

	Add (me: mutable; anObject: GraphicObject from Graphic2d)
	is static;
	---Level:	Public
	---Purpose:	Adds the graphic object <anObject> in the graphic
	--		buffer <me>.
	---Category:	Methods to manage the contents of the buffer

	Add (me: mutable; aPrimitive: Primitive from Graphic2d)
	is static;
	---Level:	Public
	---Purpose:	Adds the primitive <aPrimitive> in the graphic
	--		buffer <me>.
	---Category:	Methods to manage the contents of the buffer

	Remove (me: mutable; anObject: GraphicObject from Graphic2d)
	is static;
	---Level:       Public
        ---Purpose:     Removes the object <anObject> from the graphic
        --              buffer <me>.
        ---Category:    Methods to manage the contents of the buffer

        Remove (me: mutable; aPrimitive: Primitive from Graphic2d)
        is static;
        ---Level:       Public
        ---Purpose:     Removes the primitive <aPrimitive> from the graphic
        --              buffer <me>.
        ---Category:    Methods to manage the contents of the buffer

	Clear (me: mutable)
	is static;
	---Level:	Public
	---Purpose:	Clears the graphic buffer <me>.
	--		Removes all the primitives from the graphic buffer <me>.
	---Category:	Methods to manage the contents of the buffer
--\f
	---------------------------------------------------------
	-- Category: Methods to manage the attributes of the buffer
	---------------------------------------------------------

	SetAttrib(me : mutable;
		aWidthIndex: Integer from Standard;
		aColorIndex: Integer from Standard;
		aFontIndex: Integer from Standard;
		aDrawMode: TypeOfDrawMode from Aspect) is static;
	---Level:	Public
	---Purpose:	Updates the default buffer color with a new
	--		color index defines in the user ColorMap.
	--         	Update the default buffer font with a new
	--		font index defines in the user FontMap.
	--		Update the default buffer drawmode with
	--		REPLACE or XOR .
	--		You can specify the width index
	--		- -1 draw all lines with the largest width
	--		  defined in the buffer <me>
	--		- 0 draw all lines with the default width
	--		  defined in the driver (1 pixel)
	--		- draw all lines with the specified width
	--		  <aWidthIndex>
	--		You can specify the color index
	--		- -1 draw all primitives with the color of
	--		  the first primitive color defined in the buffer.
	--		- 0 draw all primitives with the default color.
	--		You can specify the font index
	--		- -1 draw all text primitives with the font of
	--		  the first primitive text defined in the buffer.
	--		- 0 draw all text primitives with the default font.
	--  Warning:	The buffer is redisplayed again if it was posted.
	---Category:	Methods to manage the attributes of the buffer

	SetPivot(me : mutable;
		aPivotX, aPivotY: Length from Quantity)
	is static;
	---Level:	Public
	---Purpose:	Updates the buffer pivot position.
	--  Warning:	The buffer is redisplayed again if it was posted.
	---Category:	Methods to manage the position of the buffer

	SetPivot(me : mutable)
	is static;
	---Level:	Public
	---Purpose:	Updates the buffer pivot position with the actual position.
	---Category:	Methods to manage the position of the buffer

--\f
	---------------------------------------------------------
	-- Category: Methods to manage the position of the buffer
	---------------------------------------------------------

	Move (me: mutable;
		aDeltaX,aDeltaY: Length from Quantity)
	is static;
	---Level:	Public
	---Purpose:	Moves the graphic buffer <me> at the specified
	--		position. The new position of the buffer is :
	--		(<aPivotX> + <aDeltaX>, <aPivotY> + <aDeltaY>)
	---Category:	Methods to manage the position of the buffer

	Rotate (me: mutable;
		anAngle: PlaneAngle from Quantity)
	is static;
	---Level:	Public
	---Purpose:	Rotates the graphic buffer <me> with the specified
	--		absolute counter clockwise angle from the pivot X axis.
	---Category:	Methods to manage the position of the buffer

	Scale (me: mutable;
		aFactor: Factor from Quantity)
	is static;
	---Level:	Public
	---Purpose:	Scales the graphic buffer <me> with the specified
	--		absolute scale factor from the pivot point.
	---Category:	Methods to manage the position of the buffer

	----------------------------
	-- Category: Inquire methods
	----------------------------

	View (me)
	returns mutable View from Graphic2d is static;
	---Level:	Public
	---Purpose:	Returns the view which manages the graphic buffer <me>.
	---Category:	Inquire methods

	IsEmpty (me)
	returns Boolean from Standard
	is static;
	---Level:	Public
	---Purpose:	Returns Standard_True if the graphic buffer <me>
	--		is empty, Standard_False if not.
	---Category:	Inquire methods

	IsIn (me; aPrimitive: Primitive from Graphic2d)
	returns Boolean from Standard
	is static;
	---Level:	Public
	---Purpose:	Returns Standard_True if the primitive <aPrimitive>
	--		is in the graphic buffer <me>, Standard_False if not.
	---Category:	Inquire methods

	IsIn (me; anObject: GraphicObject from Graphic2d)
	returns Boolean from Standard
	is static;
	---Level:	Public
	---Purpose:	Returns Standard_True if the graphic object <anObject>
	--		is in the graphic buffer <me>, Standard_False if not.
	---Category:	Inquire methods

	---------------------------------------------
	-- Category: Methods to manage the visibility
	---------------------------------------------

	Post (me: mutable)
	is static;
	---Level:	Public
	---Purpose:	Post the graphic buffer in the current View driver
	-- and display it.
	--  Warning: The view driver must be defined and of type WindowDriver
	-- or nothing is drawn .
	---Category:	Methods to manage the visibility

	Post (me: mutable;
                aDriver: WindowDriver from Aspect;
                aViewMapping: ViewMapping from Graphic2d;
                aXPosition, aYPosition: Real from Standard;
                aScale: Real from Standard)
	is static;
	---Level:	Public
	---Purpose:	Post the graphic buffer in a View driver and display it.
	---Category:	Methods to manage the visibility

	UnPost (me: mutable)
	is static;
	---Level:	Public
	---Purpose:	Unpost the graphic buffer from the view and erase it.
	---Category:	Methods to manage the visibility

	IsPosted (me)
	returns Boolean from Standard
	is static;
	---Level:	Public
	---Purpose:	Returns Standard_True if the graphic buffer <me>
	--		is posted in the view, Standard_False if not.
	---Category:	Methods to manage the visibility

	IsPosted (me;
                aDriver: WindowDriver from Aspect)
	returns Boolean from Standard
	is static private;
	---Level:	Public
	---Purpose:	Returns Standard_True if the graphic buffer <me>
	--		is posted in the view with the driver <aDriver>, 
	--		Standard_False if not.
	---Category:	Private methods

	-------------------------------------------------------------
	-- Category: Inquiries to retrieve the position of the buffer
	-------------------------------------------------------------

	Angle (me)
	returns PlaneAngle from Quantity is static;
	---Level:	Public
	---Purpose:	Returns the value of the rotation angle of the
	--		graphic buffer <me>.
	---Category:	Inquire methods

	Scale (me)
	returns Factor from Quantity is static;
	---Level:	Public
	---Purpose:	Returns the value of the scale factor of the
	--		graphic buffer <me>.
	---Category:	Inquire methods

	Xpivot (me)
	returns Length from Quantity is static;
	---Level:	Public
	---Purpose:	Returns the actual value of the X pivot point.
	--		of the graphic buffer <me>.
	---Category:	Inquire methods

	Ypivot (me)
	returns  Length from Quantity is static;
	---Level:	Public
	---Purpose:	Returns the actual value of the Y pivot point.
	--		of the graphic buffer <me>.
	---Category:	Inquire methods

	----------------------------
	-- Category: Private methods
	----------------------------

	Draw (me : mutable) is static private;
	---Level:	Internal
	---Purpose:	Update the internal buffer with new primitives
	--		if any and draw it at screen.
	---Category:	Private methods

	Erase (me : mutable) is static private;
	---Level:	Internal
	---Purpose:	Erase the internal buffer from the screen.
	---Category:	Private methods

	ReLoad (me : mutable; 
		ResetPosition: Boolean from Standard = Standard_True) 
		is static private;
	---Level:	Internal
	---Purpose:	Erase and Reload the internal graphic buffer before
	--		drawing to the current drawer.
	--		Keep the actual position if <ResetPosition> is FALSE.
	---Category:	Private methods

	MaxWidth (me; theWidth: out Length from Quantity;
		      theIndex: out Integer from Standard)
	returns Boolean from Standard is static private;
	---Level:	Internal
	---Purpose:	Returns Standard_True if the buffer contains
	--		lines and the maximum width of the lines in the
	--		buffer <me>
	---Category:	Private methods

fields
	myBufferId:		Integer from Standard;
	myBufferIsPosted:	Boolean from Standard;
	myDriver:		WindowDriver from Aspect;
	myPivotX:		ShortReal from Standard;
	myPivotY:		ShortReal from Standard;
	myWidthIndex:		Integer from Standard;
	myColorIndex:		Integer from Standard;
	myFontIndex:		Integer from Standard;
	myDrawMode:		TypeOfDrawMode from Aspect;
	myPView:		ViewPtr from Graphic2d;
	myPrimitives:		SequenceOfPrimitives from Graphic2d;
	myObjects:		SequenceOfGraphicObject from Graphic2d;

friends

	class View from Graphic2d

end Buffer from Graphic2d;
Commit	Line	Data
b311480e	1	-- Created by: s: CAL, GG
	2	-- Copyright (c) 1995-1999 Matra Datavision
	3	-- Copyright (c) 1999-2012 OPEN CASCADE SAS
	4	--
	5	-- The content of this file is subject to the Open CASCADE Technology Public
	6	-- License Version 6.5 (the "License"). You may not use the content of this file
	7	-- except in compliance with the License. Please obtain a copy of the License
	8	-- at http://www.opencascade.org and read it completely before using this file.
	9	--
	10	-- The Initial Developer of the Original Code is Open CASCADE S.A.S., having its
	11	-- main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France.
7fd59977	12	--
b311480e	13	-- The Original Code and all software distributed under the License is
	14	-- distributed on an "AS IS" basis, without warranty of any kind, and the
	15	-- Initial Developer hereby disclaims all such warranties, including without
	16	-- limitation, any warranties of merchantability, fitness for a particular
	17	-- purpose or non-infringement. Please see the License for the specific terms
	18	-- and conditions governing the rights and limitations under the License.
	19
	20
7fd59977	21
	22	class Buffer from Graphic2d inherits TShared from MMgt
	23
	24	---Purpose: This class constructs a 2D graphic buffer in a view. It
	25	-- manages a set of graphic objects and/or primitives.
	26	-- To draw the buffer, the following elements are required:
	27	-- - the override color
	28	-- - the font
	29	-- - a solid line type
	30	-- - thickness of 1 pixel.
	31	-- With this category , the user can drag the geometry
	32	-- stored in the buffer without changing the fixed
	33	-- background. This mechanism is reserved for the
	34	-- special driver Aspect_WindowDriver: if no other
	35	-- driver has been defined, nothing will be drawn. Both
	36	-- this driver and view mapping are used to draw the buffer.
	37	-- Warning
	38	-- - This class manages dragging only. It does not
	39	-- manage "sketching" or "rubberbanding". For example:
	40	-- - There is no empty constructor for this
	41	-- primitive. Therefore we must create a primitive
	42	-- in a dummy object simply to add this primitive to the buffer.
	43	-- - There is no Buffer->Add (anArrayOfPoints)
	44	-- method. Therefor it is not possible to add
	45	-- shapes to the buffer.
	46	-- - There are no Polyline->ChangeApoint () nor
	47	-- Circle->ChangeRadius () methods. Therefore
	48	-- we must call the primitive's destructor to modify
	49	-- the definition of one primitive in a buffer.
	50	-- - The Graphic2d_Image class is a primitive. For
	51	-- this class, we replace the definition of the image
	52	-- with a rectangle with the same size and the same position.
	53	-- - You can add or remove primitives to the buffer
	54	-- after creating and displaying it again.
	55
	56
	57
	58	uses
	59	PlaneAngle from Quantity,
	60	Factor from Quantity,
	61	Length from Quantity,
	62
	63	View from Graphic2d,
	64	Drawer from Graphic2d,
	65	ViewPtr from Graphic2d,
	66	Primitive from Graphic2d,
	67	SequenceOfPrimitives from Graphic2d,
	68	GraphicObject from Graphic2d,
	69	SequenceOfGraphicObject from Graphic2d,
	70	ViewMapping from Graphic2d,
	71	WindowDriver from Aspect,
	72	TypeOfDrawMode from Aspect
	73
	74	is
	75	-------------------------
	76	-- Category: Constructors
	77	-------------------------
	78
	79	Create (aView: View from Graphic2d;
	80	aPivotX, aPivotY: Length from Quantity;
	81	aWidthIndex: Integer from Standard = 0;
	82	aColorIndex: Integer from Standard = 0;
	83	aFontIndex: Integer from Standard = 0;
	84	aDrawMode: TypeOfDrawMode from Aspect = Aspect_TODM_REPLACE)
85	returns mutable Buffer from Graphic2d;
86	---Purpose: Creates an empty graphic buffer in the view <aView>.
87	-- A graphic buffer manages a set of graphic objects
88	-- and/or primitives.
89	-- A buffer color and font index can be defined,
90	-- in place of the default overrideColor or systemFont.
91	-- When the drawmode is REPLACE the buffer is drawn with
92	-- the right color and background drawing is used for
93	-- restoring it at Erase() time.
94	-- When the drawmode is XOR the buffer is drawn or erase
95	-- with an optimal color depending of the background color
96	-- but some side effects can appears depending of
97	-- background drawing pixels values.
98	---Category: Constructors
99
100	------------------------
101	-- Category: Destructors
102	------------------------
103
104	Destroy (me: mutable)
105	is static;
106	---Level: Public
107	---Purpose: Deletes the graphic buffer <me>.
108	---C++: alias ~
109	---Category: Destructors
110
111	---------------------------------------------------------
112	-- Category: Methods to manage the contents of the buffer
113	---------------------------------------------------------
114
115	Add (me: mutable; anObject: GraphicObject from Graphic2d)
116	is static;
117	---Level: Public
118	---Purpose: Adds the graphic object <anObject> in the graphic
119	-- buffer <me>.
120	---Category: Methods to manage the contents of the buffer
121
122	Add (me: mutable; aPrimitive: Primitive from Graphic2d)
123	is static;
124	---Level: Public
125	---Purpose: Adds the primitive <aPrimitive> in the graphic
126	-- buffer <me>.
127	---Category: Methods to manage the contents of the buffer
128
129	Remove (me: mutable; anObject: GraphicObject from Graphic2d)
130	is static;
131	---Level: Public
132	---Purpose: Removes the object <anObject> from the graphic
133	-- buffer <me>.
134	---Category: Methods to manage the contents of the buffer
135
136	Remove (me: mutable; aPrimitive: Primitive from Graphic2d)
137	is static;
138	---Level: Public
139	---Purpose: Removes the primitive <aPrimitive> from the graphic
140	-- buffer <me>.
141	---Category: Methods to manage the contents of the buffer
142
143	Clear (me: mutable)
144	is static;
145	---Level: Public
146	---Purpose: Clears the graphic buffer <me>.
147	-- Removes all the primitives from the graphic buffer <me>.
148	---Category: Methods to manage the contents of the buffer
149	--\f
150	---------------------------------------------------------
151	-- Category: Methods to manage the attributes of the buffer
152	---------------------------------------------------------
153
154	SetAttrib(me : mutable;
155	aWidthIndex: Integer from Standard;
156	aColorIndex: Integer from Standard;
157	aFontIndex: Integer from Standard;
158	aDrawMode: TypeOfDrawMode from Aspect) is static;
159	---Level: Public
160	---Purpose: Updates the default buffer color with a new
161	-- color index defines in the user ColorMap.
162	-- Update the default buffer font with a new
163	-- font index defines in the user FontMap.
164	-- Update the default buffer drawmode with
165	-- REPLACE or XOR .
166	-- You can specify the width index
167	-- - -1 draw all lines with the largest width
168	-- defined in the buffer <me>
169	-- - 0 draw all lines with the default width
170	-- defined in the driver (1 pixel)
171	-- - draw all lines with the specified width
172	-- <aWidthIndex>
173	-- You can specify the color index
174	-- - -1 draw all primitives with the color of
175	-- the first primitive color defined in the buffer.
176	-- - 0 draw all primitives with the default color.
177	-- You can specify the font index
178	-- - -1 draw all text primitives with the font of
179	-- the first primitive text defined in the buffer.
180	-- - 0 draw all text primitives with the default font.
181	-- Warning: The buffer is redisplayed again if it was posted.
182	---Category: Methods to manage the attributes of the buffer
183
184	SetPivot(me : mutable;
185	aPivotX, aPivotY: Length from Quantity)
186	is static;
187	---Level: Public
188	---Purpose: Updates the buffer pivot position.
189	-- Warning: The buffer is redisplayed again if it was posted.
190	---Category: Methods to manage the position of the buffer
191
192	SetPivot(me : mutable)
193	is static;
194	---Level: Public
195	---Purpose: Updates the buffer pivot position with the actual position.
196	---Category: Methods to manage the position of the buffer
197
198	--\f
199	---------------------------------------------------------
200	-- Category: Methods to manage the position of the buffer
201	---------------------------------------------------------
202
203	Move (me: mutable;
204	aDeltaX,aDeltaY: Length from Quantity)
205	is static;
206	---Level: Public
207	---Purpose: Moves the graphic buffer <me> at the specified
208	-- position. The new position of the buffer is :
209	-- (<aPivotX> + <aDeltaX>, <aPivotY> + <aDeltaY>)
210	---Category: Methods to manage the position of the buffer
211
212	Rotate (me: mutable;
213	anAngle: PlaneAngle from Quantity)
214	is static;
215	---Level: Public
216	---Purpose: Rotates the graphic buffer <me> with the specified
217	-- absolute counter clockwise angle from the pivot X axis.
218	---Category: Methods to manage the position of the buffer
219
220	Scale (me: mutable;
221	aFactor: Factor from Quantity)
222	is static;
223	---Level: Public
224	---Purpose: Scales the graphic buffer <me> with the specified
225	-- absolute scale factor from the pivot point.
226	---Category: Methods to manage the position of the buffer
227
228	----------------------------
229	-- Category: Inquire methods
230	----------------------------
231
232	View (me)
233	returns mutable View from Graphic2d is static;
234	---Level: Public
235	---Purpose: Returns the view which manages the graphic buffer <me>.
236	---Category: Inquire methods
237
238	IsEmpty (me)
239	returns Boolean from Standard
240	is static;
241	---Level: Public
242	---Purpose: Returns Standard_True if the graphic buffer <me>
243	-- is empty, Standard_False if not.
244	---Category: Inquire methods
245
246	IsIn (me; aPrimitive: Primitive from Graphic2d)
247	returns Boolean from Standard
248	is static;
249	---Level: Public
250	---Purpose: Returns Standard_True if the primitive <aPrimitive>
251	-- is in the graphic buffer <me>, Standard_False if not.
252	---Category: Inquire methods
253
254	IsIn (me; anObject: GraphicObject from Graphic2d)
255	returns Boolean from Standard
256	is static;
257	---Level: Public
258	---Purpose: Returns Standard_True if the graphic object <anObject>
259	-- is in the graphic buffer <me>, Standard_False if not.
260	---Category: Inquire methods
261
262	---------------------------------------------
263	-- Category: Methods to manage the visibility
264	---------------------------------------------
265
266	Post (me: mutable)
267	is static;
268	---Level: Public
269	---Purpose: Post the graphic buffer in the current View driver
270	-- and display it.
271	-- Warning: The view driver must be defined and of type WindowDriver
272	-- or nothing is drawn .
273	---Category: Methods to manage the visibility
274
275	Post (me: mutable;
276	aDriver: WindowDriver from Aspect;
277	aViewMapping: ViewMapping from Graphic2d;
278	aXPosition, aYPosition: Real from Standard;
279	aScale: Real from Standard)
280	is static;
281	---Level: Public
282	---Purpose: Post the graphic buffer in a View driver and display it.
283	---Category: Methods to manage the visibility
284
285	UnPost (me: mutable)
286	is static;
287	---Level: Public
288	---Purpose: Unpost the graphic buffer from the view and erase it.
289	---Category: Methods to manage the visibility
290
291	IsPosted (me)
292	returns Boolean from Standard
293	is static;
294	---Level: Public
295	---Purpose: Returns Standard_True if the graphic buffer <me>
296	-- is posted in the view, Standard_False if not.
297	---Category: Methods to manage the visibility
298
299	IsPosted (me;
300	aDriver: WindowDriver from Aspect)
301	returns Boolean from Standard
302	is static private;
303	---Level: Public
304	---Purpose: Returns Standard_True if the graphic buffer <me>
305	-- is posted in the view with the driver <aDriver>,
306	-- Standard_False if not.
307	---Category: Private methods
308
309	-------------------------------------------------------------
310	-- Category: Inquiries to retrieve the position of the buffer
311	-------------------------------------------------------------
312
313	Angle (me)
314	returns PlaneAngle from Quantity is static;
315	---Level: Public
316	---Purpose: Returns the value of the rotation angle of the
317	-- graphic buffer <me>.
318	---Category: Inquire methods
319
320	Scale (me)
321	returns Factor from Quantity is static;
322	---Level: Public
323	---Purpose: Returns the value of the scale factor of the
324	-- graphic buffer <me>.
325	---Category: Inquire methods
326
327	Xpivot (me)
328	returns Length from Quantity is static;
329	---Level: Public
330	---Purpose: Returns the actual value of the X pivot point.
331	-- of the graphic buffer <me>.
332	---Category: Inquire methods
333
334	Ypivot (me)
335	returns Length from Quantity is static;
336	---Level: Public
337	---Purpose: Returns the actual value of the Y pivot point.
338	-- of the graphic buffer <me>.
339	---Category: Inquire methods
340
341	----------------------------
342	-- Category: Private methods
343	----------------------------
344
345	Draw (me : mutable) is static private;
346	---Level: Internal
347	---Purpose: Update the internal buffer with new primitives
348	-- if any and draw it at screen.
349	---Category: Private methods
350
351	Erase (me : mutable) is static private;
352	---Level: Internal
353	---Purpose: Erase the internal buffer from the screen.
354	---Category: Private methods
355
356	ReLoad (me : mutable;
357	ResetPosition: Boolean from Standard = Standard_True)
358	is static private;
359	---Level: Internal
360	---Purpose: Erase and Reload the internal graphic buffer before
361	-- drawing to the current drawer.
362	-- Keep the actual position if <ResetPosition> is FALSE.
363	---Category: Private methods
364
365	MaxWidth (me; theWidth: out Length from Quantity;
366	theIndex: out Integer from Standard)
367	returns Boolean from Standard is static private;
368	---Level: Internal
369	---Purpose: Returns Standard_True if the buffer contains
370	-- lines and the maximum width of the lines in the
371	-- buffer <me>
372	---Category: Private methods
373
374	fields
375	myBufferId: Integer from Standard;
376	myBufferIsPosted: Boolean from Standard;
377	myDriver: WindowDriver from Aspect;
378	myPivotX: ShortReal from Standard;
379	myPivotY: ShortReal from Standard;
380	myWidthIndex: Integer from Standard;
381	myColorIndex: Integer from Standard;
382	myFontIndex: Integer from Standard;
383	myDrawMode: TypeOfDrawMode from Aspect;
384	myPView: ViewPtr from Graphic2d;
385	myPrimitives: SequenceOfPrimitives from Graphic2d;
386	myObjects: SequenceOfGraphicObject from Graphic2d;
387
388	friends
389
390	class View from Graphic2d
391
392	end Buffer from Graphic2d;