indexing
description: "Positions relative to other positions.%NTakes another relative point as origin and then defines a%Nhor. & vert. scaling factor, x, y and angle.%NYou can then access absolute scale_x, scale_y, x, y and angle%Nwhich are recomputed only if invalidate_absolute_position has%Nbeen called.%NYou may also choose to specify a positioner. This is an agent%Nthat gets called everytime a recomputation is requested.%NWhen a positioner is installed, the other attributes are ignored.%NThe x and y are transformed by the angle and scaling of the origin.%NThis implies that the scale_x, scale_y and angle features of this%Nobject are only for propagation to referring points."
legal: "See notice at end of class."
status: "See notice at end of class."
keywords: "point, position, location, origin"
date: "$Date: 2006-01-22 18:25:44 -0800 (Sun, 22 Jan 2006) $"
revision: "$Revision: 56675 $"
class interface
EV_RELATIVE_POINT
create
default_create
make_with_origin (an_origin: EV_RELATIVE_POINT)
`an_origin'
make_with_origin_and_position (an_origin: EV_RELATIVE_POINT; new_x, new_y: INTEGER_32)
`an_origin'`new_x'`new_y'
make_with_position (new_x, new_y: INTEGER_32)
`new_x'`new_y'
make_with_positioner (pos_agent: like positioner)
`pos_agent'
feature
absolute_coordinates: EV_COORDINATE
angle: REAL_64
angle_abs: REAL_64
ensure
result_assigned: Result = last_angle_abs
generating_type: STRING_8
ANY
generator: STRING_8
ANY
frozen id_object (an_id: INTEGER_32): IDENTIFIED
`an_id'
IDENTIFIED
ensure IDENTIFIED
consistent: Result = Void or else Result.object_id = an_id
frozen object_id: INTEGER_32
IDENTIFIED
ensure IDENTIFIED
valid_id: id_object (Result) = Current
origin: EV_RELATIVE_POINT
positioner: PROCEDURE [ANY, TUPLE [like Current]]
scale_x: REAL_64
scale_x_abs: REAL_64
ensure
result_assigned: Result = last_scale_x_abs
scale_y: REAL_64
scale_y_abs: REAL_64
ensure
result_assigned: Result = last_scale_y_abs
x: INTEGER_32
x_abs: INTEGER_32
ensure
result_assigned: Result = last_x_abs
y: INTEGER_32
y_abs: INTEGER_32
ensure
result_assigned: Result = last_y_abs
feature
frozen deep_equal (some: ANY; other: like arg #1): BOOLEAN
`some'`other'
ANY
ensure ANY
shallow_implies_deep: standard_equal (some, other) implies Result
both_or_none_void: (some = Void) implies (Result = (other = Void))
same_type: (Result and (some /= Void)) implies some.same_type (other)
symmetric: Result implies deep_equal (other, some)
frozen equal (some: ANY; other: like arg #1): BOOLEAN
`some'`other'
ANY
ensure ANY
definition: Result = (some = Void and other = Void) or else ((some /= Void and other /= Void) and then some.is_equal (other))
is_equal (other: like Current): BOOLEAN
`other'
ANY
require ANY
other_not_void: other /= Void
ensure ANY
symmetric: Result implies other.is_equal (Current)
consistent: standard_is_equal (other) implies Result
frozen standard_equal (some: ANY; other: like arg #1): BOOLEAN
`some'`other'
ANY
ensure ANY
definition: Result = (some = Void and other = Void) or else ((some /= Void and other /= Void) and then some.standard_is_equal (other))
frozen standard_is_equal (other: like Current): BOOLEAN
`other'
ANY
require ANY
other_not_void: other /= Void
ensure ANY
same_type: Result implies same_type (other)
symmetric: Result implies other.standard_is_equal (Current)
feature
being_positioned: BOOLEAN
conforms_to (other: ANY): BOOLEAN
`other'
ANY
require ANY
other_not_void: other /= Void
has_positioner: BOOLEAN
ensure
result_assigned: Result = (positioner /= Void)
relative_to (org: EV_RELATIVE_POINT): BOOLEAN
`org'
same_type (other: ANY): BOOLEAN
`other'
ANY
require ANY
other_not_void: other /= Void
ensure ANY
definition: Result = (conforms_to (other) and other.conforms_to (Current))
feature
change_origin (new_origin: EV_RELATIVE_POINT)
require
new_origin_not_void: new_origin /= Void
no_dependance_circle: not new_origin.relative_to (Current)
set_angle (new_angle: REAL_64)
set_angle_abs (new_angle_abs: REAL_64)
ensure
last_angle_abs_assigned: last_angle_abs = new_angle_abs
set_origin (new_origin: EV_RELATIVE_POINT)
require
new_origin_not_void: new_origin /= Void
no_dependance_circle: not new_origin.relative_to (Current) and new_origin /= Current
set_position (new_x, new_y: INTEGER_32)
xy
set_positioner (pos_agent: like positioner)
ensure
positioner_assigned: positioner = pos_agent
set_scale (new_scale: REAL_64)
set_scale_x (new_scale_x: REAL_64)
set_scale_x_abs (new_scale_x_abs: REAL_64)
ensure
last_scale_x_abs_assigned: last_scale_x_abs = new_scale_x_abs
set_scale_y (new_scale_y: REAL_64)
set_scale_y_abs (new_scale_y_abs: REAL_64)
ensure
last_scale_y_abs_assigned: last_scale_y_abs = new_scale_y_abs
set_x (new_x: INTEGER_32)
set_x_abs (new_x_abs: INTEGER_32)
ensure
last_x_abs_assigned: last_x_abs = new_x_abs
set_y (new_y: INTEGER_32)
set_y_abs (new_y_abs: INTEGER_32)
ensure
last_y_abs_assigned: last_y_abs = new_y_abs
feature
copy (other: like Current)
`other'
ANY
require ANY
other_not_void: other /= Void
type_identity: same_type (other)
ensure ANY
is_equal: is_equal (other)
frozen deep_copy (other: like Current)
copy`other'deep_twin
ANY
require ANY
other_not_void: other /= Void
ensure ANY
deep_equal: deep_equal (Current, other)
frozen deep_twin: like Current
ANY
ensure ANY
deep_equal: deep_equal (Current, Result)
frozen standard_copy (other: like Current)
`other'
ANY
require ANY
other_not_void: other /= Void
type_identity: same_type (other)
ensure ANY
is_standard_equal: standard_is_equal (other)
frozen standard_twin: like Current
`other'
ANY
ensure ANY
standard_twin_not_void: Result /= Void
equal: standard_equal (Result, Current)
frozen twin: like Current
`Current'
twincopycopy
ANY
ensure ANY
twin_not_void: Result /= Void
is_equal: Result.is_equal (Current)
feature
frozen default: like Current
ANY
frozen default_pointer: POINTER
`POINTER'
`p'default
`p'`POINTER'
ANY
default_rescue
ANY
frozen do_nothing
ANY
feature
io: STD_FILES
ANY
out: STRING_8
ANYtagged_out
ANY
print (some: ANY)
`some'
ANY
frozen tagged_out: STRING_8
ANYout
ANY
feature
operating_environment: OPERATING_ENVIRONMENT
ANY
feature
out_abs: STRING_8
out_rel: STRING_8
invariant
notify_list_exists: notify_list_ids /= Void
has_origin_implies_origin_notifies: origin /= Void implies origin.notify_list_ids.has (object_id)
ANY
reflexive_equality: standard_is_equal (Current)
reflexive_conformance: conforms_to (Current)
indexing
copyright: "Copyright (c) 1984-2006, Eiffel Software and others"
license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
source: "[
Eiffel Software
356 Storke Road, Goleta, CA 93117 USA
Telephone 805-685-1006, Fax 805-685-6869
Website http://www.eiffel.com
Customer support http://support.eiffel.com
]"
end EV_RELATIVE_POINT