Automatic generation produced by ISE Eiffel

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note description: "Figure groups that are the root of a world of figures.%NMay be interpreted by any kind of projection.%NExamples: may be output to a printer, saved to an XML file,%Ndrawn on a drawing area, etc." legal: "See notice at end of class." status: "See notice at end of class." keywords: "figure, world, group, universe, system" date: "$Date: 2017-05-03 07:56:14 -0800 (Wed, 03 May 2017) $" revision: "$Revision: 100317 $" class interface EV_FIGURE_WORLD create default_create -- Create with a white background. require -- from ANY True create {EV_FIGURE_WORLD} list_make (n: INTEGER_32) -- Allocate list with n items. -- (n may be zero for empty list.) -- (from EV_FIGURE_GROUP) require -- from ARRAYED_LIST valid_number_of_items: n >= 0 ensure -- from ARRAYED_LIST correct_position: before is_empty: is_empty make_filled (n: INTEGER_32) -- Allocate list with n items. -- (n may be zero for empty list.) -- This list will be full. -- (from EV_FIGURE_GROUP) require -- from ARRAYED_LIST valid_number_of_items: n >= 0 has_default: ({EV_FIGURE}).has_default ensure -- from ARRAYED_LIST correct_position: before filled: full feature -- Initialization list_make (n: INTEGER_32) -- Allocate list with n items. -- (n may be zero for empty list.) -- (from EV_FIGURE_GROUP) require -- from ARRAYED_LIST valid_number_of_items: n >= 0 ensure -- from ARRAYED_LIST correct_position: before is_empty: is_empty make_filled (n: INTEGER_32) -- Allocate list with n items. -- (n may be zero for empty list.) -- This list will be full. -- (from EV_FIGURE_GROUP) require -- from ARRAYED_LIST valid_number_of_items: n >= 0 has_default: ({EV_FIGURE}).has_default ensure -- from ARRAYED_LIST correct_position: before filled: full feature -- Access arc_cosine (v: REAL_64): REAL_64 -- Trigonometric arccosine of radian v -- in the range [0, pi]. -- (from DOUBLE_MATH) ensure -- from DOUBLE_MATH instance_free: class arc_sine (v: REAL_64): REAL_64 -- Trigonometric arcsine of radian v -- in the range [-pi/2, +pi/2]. -- (from DOUBLE_MATH) ensure -- from DOUBLE_MATH instance_free: class arc_tangent (v: REAL_64): REAL_64 -- Trigonometric arctangent of radian v -- in the range [-pi/2, +pi/2]. -- (from DOUBLE_MATH) ensure -- from DOUBLE_MATH instance_free: class area: SPECIAL [EV_FIGURE] -- Access to internal storage of ARRAYED_LIST -- (from ARRAYED_LIST) area_v2: SPECIAL [EV_FIGURE] -- Special data zone. -- (from TO_SPECIAL) at alias "@" (i: INTEGER_32): like item assign put_i_th -- Item at i-th position -- Was declared in ARRAYED_LIST as synonym of i_th. -- (from ARRAYED_LIST) require -- from TABLE valid_key: valid_index (i) array_at (i: INTEGER_32): EV_FIGURE assign array_put -- Entry at index i, if in index interval. -- Was declared in TO_SPECIAL as synonym of item. -- (from TO_SPECIAL) require -- from TO_SPECIAL valid_index: array_valid_index (i) background_color: EV_COLOR -- Color used to clear drawing device. -- Default: White. capture_figure: detachable EV_FIGURE -- Figure that has mouse capture. ceiling (v: REAL_64): REAL_64 -- Least integral greater than or equal to v. -- (from DOUBLE_MATH) ensure -- from DOUBLE_MATH instance_free: class cosine (v: REAL_64): REAL_64 -- Trigonometric cosine of radian v approximated -- in the range [-pi/4, +pi/4]. -- (from DOUBLE_MATH) ensure -- from DOUBLE_MATH instance_free: class cursor: ARRAYED_LIST_CURSOR -- Current cursor position -- (from ARRAYED_LIST) ensure -- from CURSOR_STRUCTURE cursor_not_void: Result /= Void dabs (v: REAL_64): REAL_64 -- Absolute of v. -- (from DOUBLE_MATH) ensure -- from DOUBLE_MATH instance_free: class Default_grid_x: INTEGER_32 = 20 -- Default horizontal step of grid. Default_grid_y: INTEGER_32 = 20 -- Default vertical step of grid. Euler: REAL_64 = 2.7182818284590452353602874713526625 -- Logarithm base -- (from MATH_CONST) exp (x: REAL_64): REAL_64 -- Exponential of v. -- (from DOUBLE_MATH) ensure -- from DOUBLE_MATH instance_free: class first: like item -- Item at first position -- (from ARRAYED_LIST) require -- from CHAIN not_empty: not is_empty floor (v: REAL_64): REAL_64 -- Greatest integral less than or equal to v. -- (from DOUBLE_MATH) ensure -- from DOUBLE_MATH instance_free: class generating_type: TYPE [detachable EV_FIGURE_WORLD] -- Type of current object -- (type of which it is a direct instance) -- (from ANY) ensure -- from ANY generating_type_not_void: Result /= Void generator: STRING_8 -- Name of current object's generating class -- (base class of the type of which it is a direct instance) -- (from ANY) ensure -- from ANY generator_not_void: Result /= Void generator_not_empty: not Result.is_empty grid_enabled: BOOLEAN -- Should all move handles in world snap to grid? -- Default: False. grid_visible: BOOLEAN -- Display visual representation of  grid? -- Default: True. grid_x: INTEGER_32 -- Horizontal step of grid. -- Default: Default_grid_x. grid_y: INTEGER_32 -- Vertical step of grid. -- Default: Default_grid_x. group: detachable EV_FIGURE_GROUP -- Parent of Current. -- (from EV_FIGURE) has (v: like item): BOOLEAN -- Does current include v? -- (Reference or object equality, -- based on object_comparison.) -- (from ARRAYED_LIST) require -- from CONTAINER True ensure -- from CONTAINER not_found_in_empty: Result implies not is_empty sequential_has (v: like item): BOOLEAN -- Does structure include an occurrence of v? -- (Reference or object equality, -- based on object_comparison.) -- (from LINEAR) require -- from CONTAINER True ensure -- from CONTAINER not_found_in_empty: Result implies not is_empty i_th alias "[]" (i: INTEGER_32): like item assign put_i_th -- Item at i-th position -- Was declared in ARRAYED_LIST as synonym of at. -- (from ARRAYED_LIST) require -- from TABLE valid_key: valid_index (i) require -- from READABLE_INDEXABLE valid_index: valid_index (i) frozen id_object (an_id: INTEGER_32): detachable IDENTIFIED -- Object associated with an_id (void if no such object) -- (from IDENTIFIED) ensure -- from IDENTIFIED consistent: Result = Void or else Result.object_id = an_id index: INTEGER_32 -- Index of item, if valid. -- (from ARRAYED_LIST) index_of (v: like item; i: INTEGER_32): INTEGER_32 -- Index of i-th occurrence of item identical to v. -- (Reference or object equality, -- based on object_comparison.) -- 0 if none. -- (from CHAIN) sequential_index_of (v: like item; i: INTEGER_32): INTEGER_32 -- Index of i-th occurrence of v. -- 0 if none. -- (Reference or object equality, -- based on object_comparison.) -- (from LINEAR) require -- from LINEAR positive_occurrences: i > 0 ensure -- from LINEAR non_negative_result: Result >= 0 array_item (i: INTEGER_32): EV_FIGURE assign array_put -- Entry at index i, if in index interval. -- Was declared in TO_SPECIAL as synonym of at. -- (from TO_SPECIAL) require -- from TO_SPECIAL valid_index: array_valid_index (i) item: EV_FIGURE -- Current item -- (from ARRAYED_LIST) require -- from ACTIVE readable: readable require -- from TRAVERSABLE not_off: not off require else -- from ARRAYED_LIST index_is_valid: valid_index (index) item_for_iteration: EV_FIGURE -- Item at current position -- (from LINEAR) require -- from LINEAR not_off: not off last: like first -- Item at last position -- (from ARRAYED_LIST) require -- from CHAIN not_empty: not is_empty log (v: REAL_64): REAL_64 -- Natural logarithm of v. -- (from DOUBLE_MATH) ensure -- from DOUBLE_MATH instance_free: class log10 (v: REAL_64): REAL_64 -- Base 10 logarithm of v. -- (from DOUBLE_MATH) ensure -- from DOUBLE_MATH instance_free: class log_2 (v: REAL_64): REAL_64 -- Base 2 logarithm of v. -- (from DOUBLE_MATH) ensure -- from DOUBLE_MATH instance_free: class new_cursor: ARRAYED_LIST_ITERATION_CURSOR [EV_FIGURE] -- Fresh cursor associated with current structure -- (from ARRAYED_LIST) require -- from ITERABLE True ensure -- from ITERABLE result_attached: Result /= Void frozen object_id: INTEGER_32 -- Unique for current object in any given session -- (from IDENTIFIED) ensure -- from IDENTIFIED valid_id: Result > 0 implies id_object (Result) = Current sequential_occurrences (v: like item): INTEGER_32 -- Number of times v appears. -- (Reference or object equality, -- based on object_comparison.) -- (from LINEAR) require -- from BAG True ensure -- from BAG non_negative_occurrences: Result >= 0 orientation: REAL_64 -- Angle of first point of Current. -- (from EV_FIGURE) pebble: detachable ANY -- Data to be transported by pick and drop mechanism. -- (from EV_FIGURE) pebble_function: detachable FUNCTION [detachable ANY] -- Returns data to be transported by pick and drop mechanism. -- When not Void, pebble is ignored. -- (from EV_FIGURE) Pi: REAL_64 = 3.1415926535897932384626433832795029 -- (from MATH_CONST) Pi_2: REAL_64 = 1.5707963267948966192313216916397514 -- (from MATH_CONST) Pi_4: REAL_64 = 0.7853981633974483096156608458198757 -- (from MATH_CONST) point: EV_RELATIVE_POINT -- First point of Current. -- (from EV_SINGLE_POINTED_FIGURE) point_array: ARRAY [EV_COORDINATE] -- points as absolute coordinates. -- (from EV_FIGURE) ensure -- from EV_FIGURE same_length: Result.count = points.count point_count: INTEGER_32 -- Current has one point. -- (from EV_SINGLE_POINTED_FIGURE) require -- from EV_FIGURE True pointer_style: detachable EV_POINTER_STYLE -- Cursor displayed when pointer is over this figure. -- (from EV_FIGURE) points_visible: BOOLEAN -- Are all points in world visible? -- Used for debugging purposes. -- Default: False. sine (v: REAL_64): REAL_64 -- Trigonometric sine of radian v approximated -- in range [-pi/4, +pi/4]. -- (from DOUBLE_MATH) ensure -- from DOUBLE_MATH instance_free: class sqrt (v: REAL_64): REAL_64 -- Square root of v. -- (from DOUBLE_MATH) ensure -- from DOUBLE_MATH instance_free: class Sqrt2: REAL_64 = 1.4142135623730950488016887242096981 -- Square root of 2 -- (from MATH_CONST) tangent (v: REAL_64): REAL_64 -- Trigonometric tangent of radian v approximated -- in range [-pi/4, +pi/4]. -- (from DOUBLE_MATH) ensure -- from DOUBLE_MATH instance_free: class target_data_function: detachable FUNCTION [like pebble, EV_PND_TARGET_DATA] -- Function for computing target meta data based on source pebble. -- Primarily used for Pick and Drop target menu. -- (from EV_ABSTRACT_PICK_AND_DROPABLE) note option: stable target_name: detachable READABLE_STRING_GENERAL -- Optional textual name describing Current pick and drop hole. -- (from EV_ABSTRACT_PICK_AND_DROPABLE) note option: stable to_array: ARRAY [EV_FIGURE] -- Share content to be used as an ARRAY. -- Note that although the content is shared, it might -- not be shared when a resizing occur in either ARRAY or Current. -- (from ARRAYED_LIST) ensure -- from ARRAYED_LIST to_array_attached: Result /= Void array_lower_set: Result.lower = 1 array_upper_set: Result.upper = count shared_area: Result.area = area world: EV_FIGURE_WORLD -- Current object. x_to_grid (a_x: INTEGER_32): INTEGER_32 -- Nearest point on grid to absolute a_x. y_to_grid (a_y: INTEGER_32): INTEGER_32 -- Nearest point on grid to absolute a_y. feature -- Measurement additional_space: INTEGER_32 -- Proposed number of additional items -- (from RESIZABLE) ensure -- from RESIZABLE at_least_one: Result >= 1 capacity: INTEGER_32 -- Number of items that may be stored -- (from ARRAYED_LIST) ensure -- from BOUNDED capacity_non_negative: Result >= 0 count: INTEGER_32 -- Number of items. -- (from ARRAYED_LIST) require -- from FINITE True require -- from READABLE_INDEXABLE True ensure -- from FINITE count_non_negative: Result >= 0 Growth_percentage: INTEGER_32 = 50 -- Percentage by which structure will grow automatically -- (from RESIZABLE) Lower: INTEGER_32 = 1 -- Minimum index. -- (from CHAIN) Minimal_increase: INTEGER_32 = 5 -- Minimal number of additional items -- (from RESIZABLE) occurrences (v: like item): INTEGER_32 -- Number of times v appears. -- (Reference or object equality, -- based on object_comparison.) -- (from CHAIN) upper: INTEGER_32 -- Maximum index. -- Use count instead. -- (from ARRAYED_LIST) ensure -- from ARRAYED_LIST definition: Result = count feature -- Comparison frozen deep_equal (a: detachable ANY; b: like arg #1): BOOLEAN -- Are a and b either both void -- or attached to isomorphic object structures? -- (from ANY) ensure -- from ANY instance_free: class shallow_implies_deep: standard_equal (a, b) implies Result both_or_none_void: (a = Void) implies (Result = (b = Void)) same_type: (Result and (a /= Void)) implies (b /= Void and then a.same_type (b)) symmetric: Result implies deep_equal (b, a) frozen equal (a: detachable ANY; b: like arg #1): BOOLEAN -- Are a and b either both void or attached -- to objects considered equal? -- (from ANY) ensure -- from ANY instance_free: class definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.is_equal (b)) frozen is_deep_equal alias "≡≡≡" (other: EV_FIGURE_WORLD): BOOLEAN -- Are Current and other attached to isomorphic object structures? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY shallow_implies_deep: standard_is_equal (other) implies Result same_type: Result implies same_type (other) symmetric: Result implies other.is_deep_equal (Current) is_equal (other: EV_FIGURE_WORLD): BOOLEAN -- Is other attached to an object considered -- equal to current object? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY symmetric: Result implies other ~ Current consistent: standard_is_equal (other) implies Result ensure then -- from LIST indices_unchanged: index = old index and other.index = old other.index true_implies_same_size: Result implies count = other.count frozen standard_equal (a: detachable ANY; b: like arg #1): BOOLEAN -- Are a and b either both void or attached to -- field-by-field identical objects of the same type? -- Always uses default object comparison criterion. -- (from ANY) ensure -- from ANY instance_free: class definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.standard_is_equal (b)) frozen standard_is_equal alias "" (other: EV_FIGURE_WORLD): BOOLEAN -- Is other attached to an object of the same type -- as current object, and field-by-field identical to it? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY same_type: Result implies same_type (other) symmetric: Result implies other.standard_is_equal (Current) feature -- Status report accept_cursor: EV_POINTER_STYLE -- Accept cursor set by user. -- To be displayed when the screen pointer is over a target that accepts -- pebble during pick and drop. -- (from EV_FIGURE) after: BOOLEAN -- Is there no valid cursor position to the right of cursor? -- (from LIST) require -- from LINEAR True all_default: BOOLEAN -- Are all items set to default values? -- (from ARRAYED_LIST) require -- from ARRAYED_LIST has_default: ({EV_FIGURE}).has_default before: BOOLEAN -- Is there no valid cursor position to the left of cursor? -- (from LIST) require -- from BILINEAR True bounding_box: EV_RECTANGLE -- Smallest orthogonal rectangular area Current fits in. -- (from EV_FIGURE_GROUP) ensure -- from EV_FIGURE not_void: Result /= Void changeable_comparison_criterion: BOOLEAN -- May object_comparison be changed? -- (Answer: yes by default.) -- (from CONTAINER) conforms_to (other: ANY): BOOLEAN -- Does type of current object conform to type -- of other (as per Eiffel: The Language, chapter 13)? -- (from ANY) require -- from ANY other_not_void: other /= Void deny_cursor: EV_POINTER_STYLE -- Deny cursor set by user. -- To be displayed when the screen pointer is not over a valid target. -- (from EV_FIGURE) exhausted: BOOLEAN -- Has structure been completely explored? -- (from LINEAR) ensure -- from LINEAR exhausted_when_off: off implies Result extendible: BOOLEAN -- May new items be added? (Answer: yes.) -- (from DYNAMIC_CHAIN) require -- from COLLECTION True full: BOOLEAN -- Is structure full? -- (from BOUNDED) require -- from BOX True has_capture: BOOLEAN -- Are all events sent to Current? -- (from EV_FIGURE) frozen id_freed: BOOLEAN -- Has Current been removed from the table? -- (from IDENTIFIED) invalid_rectangle: detachable EV_RECTANGLE -- Rectangle that needs erasing. -- Void if no change is made. -- (from EV_FIGURE_GROUP) is_empty: BOOLEAN -- Is structure empty? -- (from FINITE) is_inserted (v: EV_FIGURE): BOOLEAN -- Has v been inserted at the end by the most recent put or -- extend? -- (from ARRAYED_LIST) is_redraw_needed: BOOLEAN -- Does entire area need to be redrawn? -- This is the case when a figure is added or removed. is_sensitive: BOOLEAN -- Is object sensitive to user input? -- (from EV_FIGURE) is_show_requested: BOOLEAN -- Will Current be displayed when its parent is? -- (from EV_FIGURE) isfirst: BOOLEAN -- Is cursor at first position? -- (from CHAIN) ensure -- from CHAIN valid_position: Result implies not is_empty islast: BOOLEAN -- Is cursor at last position? -- (from CHAIN) ensure -- from CHAIN valid_position: Result implies not is_empty object_comparison: BOOLEAN -- Must search operations use equal rather than = -- for comparing references? (Default: no, use =.) -- (from CONTAINER) off: BOOLEAN -- Is there no current item? -- (from CHAIN) require -- from TRAVERSABLE True prunable: BOOLEAN -- May items be removed? (Answer: yes.) -- (from ARRAYED_LIST) require -- from COLLECTION True readable: BOOLEAN -- Is there a current item that may be read? -- (from SEQUENCE) require -- from ACTIVE True replaceable: BOOLEAN -- Can current item be replaced? -- (from ACTIVE) resizable: BOOLEAN -- May capacity be changed? (Answer: yes.) -- (from RESIZABLE) same_type (other: ANY): BOOLEAN -- Is type of current object identical to type of other? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY definition: Result = (conforms_to (other) and other.conforms_to (Current)) update_rectangle: detachable EV_RECTANGLE -- Rectangle that needs redrawing. -- Void if no change is made. -- (from EV_FIGURE_GROUP) valid_cursor (p: CURSOR): BOOLEAN -- Can the cursor be moved to position p? -- (from ARRAYED_LIST) valid_cursor_index (i: INTEGER_32): BOOLEAN -- Is i correctly bounded for cursor movement? -- (from CHAIN) ensure -- from CHAIN valid_cursor_index_definition: Result = ((i >= 0) and (i <= count + 1)) valid_index (i: INTEGER_32): BOOLEAN -- Is i a valid index? -- (from ARRAYED_LIST) require -- from READABLE_INDEXABLE True require -- from TABLE True ensure -- from READABLE_INDEXABLE only_if_in_index_set: Result implies (Lower <= i and i <= count) ensure then -- from CHAIN valid_index_definition: Result = ((i >= 1) and (i <= count)) array_valid_index (i: INTEGER_32): BOOLEAN -- Is i within the bounds of Current? -- (from TO_SPECIAL) writable: BOOLEAN -- Is there a current item that may be modified? -- (from SEQUENCE) require -- from ACTIVE True feature -- Status setting compare_objects -- Ensure that future search operations will use equal -- rather than = for comparing references. -- (from CONTAINER) require -- from CONTAINER changeable_comparison_criterion: changeable_comparison_criterion ensure -- from CONTAINER object_comparison compare_references -- Ensure that future search operations will use = -- rather than equal for comparing references. -- (from CONTAINER) require -- from CONTAINER changeable_comparison_criterion: changeable_comparison_criterion ensure -- from CONTAINER reference_comparison: not object_comparison disable_capture -- Disable grab of all events on world. -- (from EV_FIGURE) require -- from EV_FIGURE in_world: world /= Void ensure -- from EV_FIGURE capture_released: not has_capture disable_grid -- Set grid_enabled False. ensure grid_disabled: not grid_enabled disable_sensitive -- Make object non-sensitive to user input. -- (from EV_FIGURE) ensure -- from EV_FIGURE insensitive_requested: not internal_is_sensitive enable_capture -- Grab all mouse events for world. -- (from EV_FIGURE) require -- from EV_FIGURE in_world: world /= Void ensure -- from EV_FIGURE capture_set: has_capture enable_grid -- Set grid_enabled True. ensure grid_enabled: grid_enabled enable_sensitive -- Make object sensitive to user input. -- (from EV_FIGURE) ensure -- from EV_FIGURE sensitive_requested: internal_is_sensitive full_redraw -- On next projection, mark entire area as invalid. hide -- Request that Current not be displayed even when its group is. -- (from EV_FIGURE) ensure -- from EV_FIGURE not_is_show_requested: not is_show_requested hide_grid -- Set grid_visible to False. ensure not_grid_visible: not grid_visible hide_points -- Set points_visible to False. ensure not_points_visible: not points_visible intersects (r: EV_RECTANGLE): BOOLEAN -- Does r intersect Currents bounding_box? -- (from EV_FIGURE) set_point (a_point: EV_RELATIVE_POINT) -- Assign a_point to point. -- (from EV_SINGLE_POINTED_FIGURE) require -- from EV_SINGLE_POINTED_FIGURE a_point_not_void: a_point /= Void ensure -- from EV_SINGLE_POINTED_FIGURE point_assigned: point = a_point set_target_data_function (a_function: FUNCTION [like pebble, EV_PND_TARGET_DATA]) -- Set a_function to compute target meta data based on transport source. -- Overrides any target_name set with set_target_name. -- (from EV_ABSTRACT_PICK_AND_DROPABLE) require -- from EV_ABSTRACT_PICK_AND_DROPABLE a_function_not_void: a_function /= Void ensure -- from EV_ABSTRACT_PICK_AND_DROPABLE target_data_function_assigned: target_data_function /= Void and then target_data_function.is_equal (a_function) set_target_name (a_name: READABLE_STRING_GENERAL) -- Assign a_name to target_name. -- (from EV_ABSTRACT_PICK_AND_DROPABLE) require -- from EV_ABSTRACT_PICK_AND_DROPABLE a_name_not_void: a_name /= Void ensure -- from EV_ABSTRACT_PICK_AND_DROPABLE target_name_assigned: attached target_name as l_target_name and then a_name /= l_target_name and then a_name.same_string (l_target_name) show -- Request that Current be displayed when its group is. -- True by default. -- (from EV_FIGURE) ensure -- from EV_FIGURE is_show_requested: is_show_requested show_grid -- Set grid_visible to True. ensure grid_visible: grid_visible show_points -- Set points_visible to True. ensure points_visible: points_visible snap_to_grid -- Move all move handles to most nearby point on the grid. -- (from EV_FIGURE_GROUP) require -- from EV_FIGURE_GROUP world_not_void: attached world as l_world grid_enabled: l_world.grid_enabled feature -- Cursor movement back -- Move cursor one position backward. -- (from ARRAYED_LIST) require -- from BILINEAR not_before: not before finish -- Move cursor to last position if any. -- (from ARRAYED_LIST) require -- from LINEAR True ensure then -- from CHAIN at_last: not is_empty implies islast ensure then -- from ARRAYED_LIST before_when_empty: is_empty implies before forth -- Move cursor one position forward. -- (from ARRAYED_LIST) require -- from LINEAR not_after: not after ensure then -- from LIST moved_forth: index = old index + 1 go_i_th (i: INTEGER_32) -- Move cursor to i-th position. -- (from ARRAYED_LIST) require -- from CHAIN valid_cursor_index: valid_cursor_index (i) ensure -- from CHAIN position_expected: index = i go_to (p: CURSOR) -- Move cursor to position p. -- (from ARRAYED_LIST) require -- from CURSOR_STRUCTURE cursor_position_valid: valid_cursor (p) move (i: INTEGER_32) -- Move cursor i positions. -- (from ARRAYED_LIST) ensure -- from CHAIN too_far_right: (old index + i > count) implies exhausted too_far_left: (old index + i < 1) implies exhausted expected_index: (not exhausted) implies (index = old index + i) search (v: like item) -- Move to first position (at or after current -- position) where item and v are equal. -- If structure does not include v ensure that -- exhausted will be true. -- (Reference or object equality, -- based on object_comparison.) -- (from ARRAYED_LIST) require -- from LINEAR True ensure -- from LINEAR object_found: (not exhausted and object_comparison) implies v ~ item item_found: (not exhausted and not object_comparison) implies v = item start -- Move cursor to first position if any. -- (from ARRAYED_LIST) require -- from TRAVERSABLE True ensure then -- from CHAIN at_first: not is_empty implies isfirst ensure then -- from ARRAYED_LIST after_when_empty: is_empty implies after feature -- Element change fill (other: CONTAINER [EV_FIGURE]) -- Fill with as many items of other as possible. -- The representations of other and current structure -- need not be the same. -- (from CHAIN) require -- from COLLECTION other_not_void: other /= Void extendible: extendible array_put (v: EV_FIGURE; i: INTEGER_32) -- Replace i-th entry, if in index interval, by v. -- (from TO_SPECIAL) require -- from TO_SPECIAL valid_index: array_valid_index (i) ensure -- from TO_SPECIAL inserted: array_item (i) = v put (v: like item) -- Replace current item by v. -- (Synonym for replace) -- (from CHAIN) require -- from CHAIN writeable: writable replaceable: replaceable ensure -- from CHAIN same_count: count = old count is_inserted: is_inserted (v) sequence_put (v: like item) -- Add v to end. -- (from SEQUENCE) require -- from COLLECTION extendible: extendible ensure -- from COLLECTION item_inserted: is_inserted (v) ensure then -- from SEQUENCE new_count: count = old count + 1 put_front (v: like item) -- Add v to the beginning. -- Do not move cursor. -- (from ARRAYED_LIST) require -- from DYNAMIC_CHAIN extendible: extendible ensure -- from DYNAMIC_CHAIN new_count: count = old count + 1 item_inserted: first = v put_i_th (v: like i_th; i: INTEGER_32) -- Replace i-th entry, if in index interval, by v. -- (from ARRAYED_LIST) require -- from TABLE valid_key: valid_index (i) require -- from TABLE valid_key: valid_index (i) ensure -- from TABLE inserted: i_th (i) = v put_left (v: like item) -- Add v to the left of current position. -- Do not move cursor. -- (from ARRAYED_LIST) require -- from DYNAMIC_CHAIN extendible: extendible not_before: not before ensure -- from DYNAMIC_CHAIN new_count: count = old count + 1 new_index: index = old index + 1 put_right (v: like item) -- Add v to the right of current position. -- Do not move cursor. -- (from ARRAYED_LIST) require -- from DYNAMIC_CHAIN extendible: extendible not_after: not after ensure -- from DYNAMIC_CHAIN new_count: count = old count + 1 same_index: index = old index remove_capture_figure -- Set capture_figure to Void. require capture_figure_not_void: capture_figure /= Void ensure removed: capture_figure = Void remove_pebble -- Make pebble Void and pebble_function `Void, -- Removing transport. -- (from EV_FIGURE) ensure -- from EV_ABSTRACT_PICK_AND_DROPABLE pebble_removed: pebble = Void and pebble_function = Void set_accept_cursor (a_cursor: detachable like accept_cursor) -- Set a_cursor to be displayed when the screen pointer is over a -- target that accepts pebble during pick and drop. -- (from EV_FIGURE) ensure -- from EV_ABSTRACT_PICK_AND_DROPABLE accept_cursor_assigned: attached a_cursor as l_accept_cursor implies l_accept_cursor ~ accept_cursor set_background_color (a_color: EV_COLOR) -- Assign a_color to background_color. require a_color_not_void: a_color /= Void ensure assigned: background_color = a_color set_capture_figure (a_figure: EV_FIGURE) -- Set capture_figure to a_figure. require a_figure_not_void: a_figure /= Void ensure assigned: capture_figure = a_figure set_deny_cursor (a_cursor: detachable like deny_cursor) -- Set a_cursor to be displayed when the screen pointer is not -- over a valid target. -- (from EV_FIGURE) ensure -- from EV_ABSTRACT_PICK_AND_DROPABLE deny_cursor_assigned: attached a_cursor as l_deny_cursor implies l_deny_cursor ~ deny_cursor set_grid_x (new_grid_x: INTEGER_32) -- Assign new_grid_x to grid_x. require new_grid_x_positive: new_grid_x > 0 ensure assigned: grid_x = new_grid_x set_grid_y (new_grid_y: INTEGER_32) -- Assign new_grid_y to grid_y. require new_grid_y_positive: new_grid_y > 0 ensure assigned: grid_y = new_grid_y set_origin (an_origin: EV_RELATIVE_POINT) -- Change origin of all points to o without moving. -- (from EV_FIGURE) set_pebble (a_pebble: like pebble) -- Assign a_pebble to pebble. -- (from EV_FIGURE) require -- from EV_ABSTRACT_PICK_AND_DROPABLE a_pebble_not_void: a_pebble /= Void ensure -- from EV_ABSTRACT_PICK_AND_DROPABLE pebble_assigned: pebble = a_pebble set_pebble_function (a_function: FUNCTION [ANY]) -- Set a_function to compute pebble. -- (from EV_FIGURE) require -- from EV_ABSTRACT_PICK_AND_DROPABLE a_function_not_void: a_function /= Void a_function_takes_two_integer_open_operands: a_function.valid_operands ([1, 1]) ensure -- from EV_ABSTRACT_PICK_AND_DROPABLE pebble_function_assigned: pebble_function = a_function set_pointer_style (a_cursor: like pointer_style) -- Assign a_cursor to pointer_style. -- (from EV_FIGURE) require -- from EV_FIGURE a_cursor_not_void: a_cursor /= Void ensure -- from EV_FIGURE pointer_style_assigned: pointer_style = a_cursor feature -- Removal dispose -- Free the entry associated with object_id if any -- (from IDENTIFIED) require -- from DISPOSABLE True ensure then -- from IDENTIFIED object_freed: id_freed frozen free_id -- Free the entry associated with object_id if any. -- (from IDENTIFIED) ensure -- from IDENTIFIED object_freed: id_freed prune (v: like item) -- Remove first occurrence of v, if any, -- after cursor position. -- Move cursor to right neighbor. -- (or after if no right neighbor or v does not occur) -- (from ARRAYED_LIST) require -- from COLLECTION prunable: prunable remove_i_th (i: INTEGER_32) -- Remove item at index i. -- Move cursor to next neighbor (or after if no next neighbor) if it is at i-th position. -- Do not change cursor otherwise. -- (from ARRAYED_LIST) require -- from DYNAMIC_TABLE prunable: prunable valid_key: valid_index (i) ensure then -- from DYNAMIC_CHAIN new_count: count = old count - 1 same_index_if_below: index <= i implies index = old index new_index_if_above: index > i implies index = old index - 1 same_leading_items: across old twin as c all c.target_index < i implies c.item = i_th (c.target_index) end same_trailing_items: across old twin as c all c.target_index > i implies c.item = i_th (c.target_index - 1) end remove_left -- Remove item to the left of cursor position. -- Do not move cursor. -- (from ARRAYED_LIST) require -- from DYNAMIC_CHAIN left_exists: index > 1 ensure -- from DYNAMIC_CHAIN new_count: count = old count - 1 new_index: index = old index - 1 remove_right -- Remove item to the right of cursor position -- Do not move cursor -- (from ARRAYED_LIST) require -- from DYNAMIC_CHAIN right_exists: index < count ensure -- from DYNAMIC_CHAIN new_count: count = old count - 1 same_index: index = old index chain_wipe_out -- Remove all items. -- (from DYNAMIC_CHAIN) require -- from COLLECTION prunable: prunable ensure -- from COLLECTION wiped_out: is_empty feature -- Resizing automatic_grow -- Change the capacity to accommodate at least -- Growth_percentage more items. -- (from RESIZABLE) require -- from RESIZABLE resizable: resizable ensure -- from RESIZABLE increased_capacity: capacity >= old capacity + old additional_space grow (i: INTEGER_32) -- Change the capacity to at least i. -- (from ARRAYED_LIST) require -- from RESIZABLE resizable: resizable ensure -- from RESIZABLE new_capacity: capacity >= i resize (new_capacity: INTEGER_32) -- Resize list so that it can contain -- at least n items. Do not lose any item. -- (from ARRAYED_LIST) require -- from ARRAYED_LIST resizable: resizable new_capacity_large_enough: new_capacity >= capacity ensure -- from ARRAYED_LIST capacity_set: capacity >= new_capacity trim -- Decrease capacity to the minimum value. -- Apply to reduce allocated storage. -- (from ARRAYED_LIST) require -- from RESIZABLE True ensure -- from RESIZABLE same_count: count = old count minimal_capacity: capacity = count ensure then -- from ARRAYED_LIST same_items: to_array.same_items (old to_array) feature -- Transformation swap (i: INTEGER_32) -- Exchange item at i-th position with item -- at cursor position. -- (from ARRAYED_LIST) require -- from CHAIN not_off: not off valid_index: valid_index (i) ensure -- from CHAIN swapped_to_item: item = old i_th (i) swapped_from_item: i_th (i) = old item feature -- Conversion linear_representation: LINEAR [EV_FIGURE] -- Representation as a linear structure -- (from LINEAR) require -- from CONTAINER True feature -- Duplication copy (other: EV_FIGURE_WORLD) -- Update current object using fields of object attached -- to other, so as to yield equal objects. -- (from ANY) require -- from ANY other_not_void: other /= Void type_identity: same_type (other) ensure -- from ANY is_equal: Current ~ other ensure then -- from ARRAYED_LIST equal_areas: area_v2 ~ other.area_v2 frozen deep_copy (other: EV_FIGURE_WORLD) -- Effect equivalent to that of: -- copy (other . deep_twin) -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY deep_equal: deep_equal (Current, other) frozen deep_twin: EV_FIGURE_WORLD -- New object structure recursively duplicated from Current. -- (from ANY) ensure -- from ANY deep_twin_not_void: Result /= Void deep_equal: deep_equal (Current, Result) frozen standard_copy (other: EV_FIGURE_WORLD) -- Copy every field of other onto corresponding field -- of current object. -- (from ANY) require -- from ANY other_not_void: other /= Void type_identity: same_type (other) ensure -- from ANY is_standard_equal: standard_is_equal (other) frozen standard_twin: EV_FIGURE_WORLD -- New object field-by-field identical to other. -- Always uses default copying semantics. -- (from ANY) ensure -- from ANY standard_twin_not_void: Result /= Void equal: standard_equal (Result, Current) frozen twin: EV_FIGURE_WORLD -- New object equal to Current -- twin calls copy; to change copying/twinning semantics, redefine copy. -- (from ANY) ensure -- from ANY twin_not_void: Result /= Void is_equal: Result ~ Current feature -- Basic operations frozen default: detachable EV_FIGURE_WORLD -- Default value of object's type -- (from ANY) frozen default_pointer: POINTER -- Default value of type POINTER -- (Avoid the need to write p.default for -- some p of type POINTER.) -- (from ANY) ensure -- from ANY instance_free: class default_rescue -- Process exception for routines with no Rescue clause. -- (Default: do nothing.) -- (from ANY) frozen do_nothing -- Execute a null action. -- (from ANY) ensure -- from ANY instance_free: class eif_current_object_id: INTEGER_32 -- New identifier for Current -- (from IDENTIFIED_ROUTINES) ensure -- from IDENTIFIED_ROUTINES eif_current_object_id: Result > 0 inserted: eif_is_object_id_of_current (Result) eif_id_object (an_id: INTEGER_32): detachable ANY -- Object associated with an_id -- (from IDENTIFIED_ROUTINES) require -- from IDENTIFIED_ROUTINES an_id_non_negative: an_id >= 0 ensure -- from IDENTIFIED_ROUTINES instance_free: class eif_is_object_id_of_current (an_id: INTEGER_32): BOOLEAN -- Is an_id the associated object ID of Current. -- (from IDENTIFIED_ROUTINES) require -- from IDENTIFIED_ROUTINES an_id_non_negative: an_id >= 0 eif_object_id (an_object: ANY): INTEGER_32 -- New identifier for an_object -- (from IDENTIFIED_ROUTINES) ensure -- from IDENTIFIED_ROUTINES instance_free: class eif_object_id_positive: Result > 0 inserted: eif_id_object (Result) = an_object eif_object_id_free (an_id: INTEGER_32) -- Free the entry an_id -- (from IDENTIFIED_ROUTINES) require -- from IDENTIFIED_ROUTINES an_id_non_negative: an_id >= 0 ensure -- from IDENTIFIED_ROUTINES instance_free: class removed: eif_id_object (an_id) = Void feature -- Implementation between (n, a, b: INTEGER_32): BOOLEAN -- Is n a value between a and b? -- (from EV_FIGURE_MATH) delta_x (angle: REAL_64; length: INTEGER_32): INTEGER_32 -- Get dx component of line segment with length and angle. -- (from EV_FIGURE_MATH) delta_y (angle: REAL_64; length: INTEGER_32): INTEGER_32 -- Get dy component of line segment with length and angle. -- (from EV_FIGURE_MATH) distance (x1, y1, x2, y2: INTEGER_32): INTEGER_32 -- Calculate distance between (x1, y1) and (x2, y2). -- (from EV_FIGURE_MATH) distance_from_line (x, y, x1, y1, x2, y2: INTEGER_32): INTEGER_32 -- Calculate distance between (x, y) and (x1, y1)-(x2, y2). -- The line is considered to be infinite. -- (from EV_FIGURE_MATH) line_angle (x1, y1, x2, y2: INTEGER_32): REAL_64 -- Return angle of line from (x1, y1) to (x2, y2) relative to world. -- (from EV_FIGURE_MATH) modulo (a, b: REAL_64): REAL_64 -- a modulo b. -- (from EV_FIGURE_MATH) require -- from EV_FIGURE_MATH divisible: b > 0.0 ensure -- from EV_FIGURE_MATH in_interval: Result >= 0.0 and Result < b Pi_half: REAL_64 = 1.57079633 -- (from EV_FIGURE_MATH) Pi_half_times_three: REAL_64 = 4.71238898 -- (from EV_FIGURE_MATH) Pi_quater: REAL_64 = 0.785398163 -- (from EV_FIGURE_MATH) Pi_times_three: REAL_64 = 9.42477796 -- (from EV_FIGURE_MATH) Pi_times_two: REAL_64 = 6.28318531 -- (from EV_FIGURE_MATH) point_on_ellipse (x, y, xc, yc, r1, r2: INTEGER_32): BOOLEAN -- Is (x, y) inside specified ellipse? -- (from EV_FIGURE_MATH) point_on_ellipse_boundary (x, y, xc, yc, r1, r2, width: INTEGER_32): BOOLEAN -- Is (x, y) on specified ellipse border? -- (from EV_FIGURE_MATH) point_on_line (x, y, x1, y1, x2, y2, width: INTEGER_32): BOOLEAN -- Is (x, y) on line from (x2, y2) to (x1, y1) with width? -- (from EV_FIGURE_MATH) point_on_polygon (x, y: INTEGER_32; points: ARRAY [EV_COORDINATE]): BOOLEAN -- Is (x, y) contained in polygon with points? -- Based on code by Hanpeter van Vliet. -- (from EV_FIGURE_MATH) point_on_rectangle (x, y, x1, y1, x2, y2: INTEGER_32): BOOLEAN -- Is (x, y) inside specified box? -- (from EV_FIGURE_MATH) point_on_segment (x, y, x1, y1, x2, y2, width: INTEGER_32): BOOLEAN -- Is (x, y) on segment [(x2, y2), (x1, y1)] with width? -- (from EV_FIGURE_MATH) feature -- Action sequences conforming_pick_actions: EV_NOTIFY_ACTION_SEQUENCE -- Actions to be performed when a pebble that fits this hole is -- picked up from another source. -- (when drop_actions.accepts_pebble (pebble)) -- (from EV_FIGURE) drop_actions: EV_PND_ACTION_SEQUENCE -- Actions to take when pick and drop transport drops on Current. -- (from EV_FIGURE) pick_actions: EV_PND_START_ACTION_SEQUENCE -- Actions to be performed when pebble is picked up. -- (from EV_FIGURE) pointer_button_press_actions: EV_POINTER_BUTTON_ACTION_SEQUENCE -- Actions to be performed when screen pointer button is pressed. -- (from EV_FIGURE) pointer_button_release_actions: EV_POINTER_BUTTON_ACTION_SEQUENCE -- Actions to be performed when screen pointer button is released. -- (from EV_FIGURE) pointer_double_press_actions: EV_POINTER_BUTTON_ACTION_SEQUENCE -- Actions to be performed when screen pointer is double clicked. -- (from EV_FIGURE) pointer_enter_actions: EV_NOTIFY_ACTION_SEQUENCE -- Actions to be performed when screen pointer enters widget. -- (from EV_FIGURE) pointer_leave_actions: EV_NOTIFY_ACTION_SEQUENCE -- Actions to be performed when screen pointer leaves widget. -- (from EV_FIGURE) pointer_motion_actions: EV_POINTER_MOTION_ACTION_SEQUENCE -- Actions to be performed when screen pointer moves. -- (from EV_FIGURE) feature -- Correction Mismatch_information: MISMATCH_INFORMATION -- Original attribute values of mismatched object -- (from MISMATCH_CORRECTOR) feature -- Events position_on_figure (x, y: INTEGER_32): BOOLEAN -- Is (x, y) on this figure? -- Always returns False, but descendants can override -- it to improve efficiency. -- (from EV_FIGURE_GROUP) feature -- Iteration do_all (action: PROCEDURE [EV_FIGURE]) -- Apply action to every item, from first to last. -- Semantics not guaranteed if action changes the structure; -- in such a case, apply iterator to clone of structure instead. -- (from ARRAYED_LIST) require -- from TRAVERSABLE action_exists: action /= Void do_all_with_index (action: PROCEDURE [EV_FIGURE, INTEGER_32]) -- Apply action to every item, from first to last. -- action receives item and its index. -- Semantics not guaranteed if action changes the structure; -- in such a case, apply iterator to clone of structure instead. -- (from ARRAYED_LIST) require -- from ARRAYED_LIST action_not_void: action /= Void do_if (action: PROCEDURE [EV_FIGURE]; test: FUNCTION [EV_FIGURE, BOOLEAN]) -- Apply action to every item that satisfies test, from first to last. -- Semantics not guaranteed if action or test changes the structure; -- in such a case, apply iterator to clone of structure instead. -- (from ARRAYED_LIST) require -- from TRAVERSABLE action_exists: action /= Void test_exists: test /= Void do_if_with_index (action: PROCEDURE [EV_FIGURE, INTEGER_32]; test: FUNCTION [EV_FIGURE, INTEGER_32, BOOLEAN]) -- Apply action to every item that satisfies test, from first to last. -- action and test receive the item and its index. -- Semantics not guaranteed if action or test changes the structure; -- in such a case, apply iterator to clone of structure instead. -- (from ARRAYED_LIST) require -- from ARRAYED_LIST action_not_void: action /= Void test_not_void: test /= Void for_all (test: FUNCTION [EV_FIGURE, BOOLEAN]): BOOLEAN -- Is test true for all items? -- (from ARRAYED_LIST) require -- from TRAVERSABLE test_exists: test /= Void ensure then -- from LINEAR empty: is_empty implies Result there_exists (test: FUNCTION [EV_FIGURE, BOOLEAN]): BOOLEAN -- Is test true for at least one item? -- (from ARRAYED_LIST) require -- from TRAVERSABLE test_exists: test /= Void feature -- List operations append (s: SEQUENCE [EV_FIGURE]) -- Append a copy of s. -- (from EV_FIGURE_GROUP) require -- from SEQUENCE argument_not_void: s /= Void ensure -- from SEQUENCE new_count: count >= old count extend (fig: like item) -- Add fig to the group. -- (from EV_FIGURE_GROUP) require -- from COLLECTION extendible: extendible ensure -- from COLLECTION item_inserted: is_inserted (fig) force (fig: like item) -- Add fig to the group. -- (from EV_FIGURE_GROUP) require -- from SEQUENCE extendible: extendible ensure then -- from SEQUENCE new_count: count = old count + 1 item_inserted: has (fig) insert (fig: like item; i: INTEGER_32) -- Add fig to the group. -- (from EV_FIGURE_GROUP) require -- from ARRAYED_LIST index_small_enough: i <= count index_large_enough: i >= 1 ensure -- from ARRAYED_LIST new_count: count = old count + 1 index_unchanged: index = old index insertion_done: i_th (i) = fig make_from_array (a: ARRAY [EV_FIGURE]) -- Create list from array a. -- (from EV_FIGURE_GROUP) require -- from ARRAYED_LIST array_exists: a /= Void ensure -- from ARRAYED_LIST shared: area = a.area correct_position: before filled: count = a.count merge_left (other: ARRAYED_LIST [EV_FIGURE]) -- Merge other into group before cursor. -- other will be empty afterwards. -- (from EV_FIGURE_GROUP) require -- from DYNAMIC_CHAIN extendible: extendible not_before: not before other_exists: other /= Void not_current: other /= Current ensure -- from DYNAMIC_CHAIN new_count: count = old count + old other.count new_index: index = old index + old other.count other_is_empty: other.is_empty merge_right (other: ARRAYED_LIST [EV_FIGURE]) -- Merge other into group after cursor. -- other will be empty afterwards. -- (from EV_FIGURE_GROUP) require -- from DYNAMIC_CHAIN extendible: extendible not_after: not after other_exists: other /= Void not_current: other /= Current ensure -- from DYNAMIC_CHAIN new_count: count = old count + old other.count same_index: index = old index other_is_empty: other.is_empty prune_all (fig: like item) -- Remove fig from the group. -- (from EV_FIGURE_GROUP) require -- from COLLECTION prunable: prunable ensure -- from COLLECTION no_more_occurrences: not has (fig) ensure then -- from DYNAMIC_CHAIN is_exhausted: exhausted ensure then -- from ARRAYED_LIST is_after: after remove -- Remove item from figure. -- (from EV_FIGURE_GROUP) require -- from ACTIVE prunable: prunable writable: writable ensure then -- from DYNAMIC_LIST after_when_empty: is_empty implies after ensure then -- from ARRAYED_LIST index: index = old index replace (fig: like item) -- Add fig to the group. -- (from EV_FIGURE_GROUP) require -- from ACTIVE writable: writable replaceable: replaceable ensure -- from ACTIVE item_replaced: item = fig wipe_out -- Unreference all groups. -- (from EV_FIGURE_GROUP) ensure then -- from DYNAMIC_LIST is_before: before feature -- Output Io: STD_FILES -- Handle to standard file setup -- (from ANY) ensure -- from ANY instance_free: class io_not_void: Result /= Void out: STRING_8 -- New string containing terse printable representation -- of current object -- (from ANY) ensure -- from ANY out_not_void: Result /= Void print (o: detachable ANY) -- Write terse external representation of o -- on standard output. -- (from ANY) ensure -- from ANY instance_free: class frozen tagged_out: STRING_8 -- New string containing terse printable representation -- of current object -- (from ANY) ensure -- from ANY tagged_out_not_void: Result /= Void feature -- Platform Operating_environment: OPERATING_ENVIRONMENT -- Objects available from the operating system -- (from ANY) ensure -- from ANY instance_free: class operating_environment_not_void: Result /= Void feature -- Recomputation calculate_absolute_position -- Recalculates all absolute positions inside this group. -- (from EV_FIGURE_GROUP) invalidate -- Some property of Current has changed. -- (from EV_FIGURE_GROUP) validate -- Invalidate Current. -- (from EV_FIGURE_GROUP) feature -- Retrieval correct_mismatch -- Attempt to correct object mismatch using Mismatch_information. -- (from ARRAYED_LIST) invariant background_color_exists: background_color /= Void -- from EV_FIGURE points_not_void: points /= Void points_correct_size: points.count = point_count points_items_not_void: all_points_exist (points) -- from ANY reflexive_equality: standard_is_equal (Current) reflexive_conformance: conforms_to (Current) -- from ARRAYED_LIST prunable: prunable starts_from_one: Lower = 1 -- from RESIZABLE increase_by_at_least_one: Minimal_increase >= 1 -- from BOUNDED valid_count: count <= capacity full_definition: full = (count = capacity) -- from FINITE empty_definition: is_empty = (count = 0) -- from LIST before_definition: before = (index = 0) after_definition: after = (index = count + 1) -- from CHAIN non_negative_index: index >= 0 index_small_enough: index <= count + 1 off_definition: off = ((index = 0) or (index = count + 1)) isfirst_definition: isfirst = ((not is_empty) and (index = 1)) islast_definition: islast = ((not is_empty) and (index = count)) item_corresponds_to_index: (not off) implies (item = i_th (index)) -- from ACTIVE writable_constraint: writable implies readable empty_constraint: is_empty implies (not readable) and (not writable) -- from READABLE_INDEXABLE consistent_boundaries: Lower <= count or else Lower = count + 1 -- from BILINEAR not_both: not (after and before) before_constraint: before implies off -- from LINEAR after_constraint: after implies off -- from TRAVERSABLE empty_constraint: is_empty implies off note 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 -- class EV_FIGURE_WORLD
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