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Add fixed items to irregular instance #344

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Merged
fontanf merged 1 commit into from
Apr 19, 2026
Merged

Add fixed items to irregular instance #344

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81 changes: 81 additions & 0 deletions data/irregular/tests/fixed_item.json
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Original file line number Diff line number Diff line change
@@ -0,0 +1,81 @@
{
"objective": "open-dimension-x",
"bin_types": [
{
"type": "polygon",
"copies": 1,
"copies_min": 1,
"vertices": [
{
"x": 0,
"y": 0
},
{
"x": 40,
"y": 0
},
{
"x": 40,
"y": 30
},
{
"x": 0,
"y": 30
}
],
"fixed_items": [
{
"item_type_id": 0,
"angle": 0,
"mirror": false,
"bl_corner": {"x": 10, "y": 10}
}
]
}
],
"item_types": [
{
"type": "polygon",
"vertices": [
{
"x": 0,
"y": 0
},
{
"x": 10,
"y": 0
},
{
"x": 10,
"y": 20
},
{
"x": 0,
"y": 20
}
]
},
{
"type": "polygon",
"allow_mirroring": true,
"vertices": [
{
"x": 0,
"y": 0
},
{
"x": 10,
"y": 0
},
{
"x": 10,
"y": 10
},
{
"x": 0,
"y": 10
}
]
}
]
}
122 changes: 122 additions & 0 deletions data/irregular/tests/fixed_item_solution.json
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Original file line number Diff line number Diff line change
@@ -0,0 +1,122 @@
{
"bins": [
{
"copies": 1,
"id": 0,
"items": [
{
"angle": 0.0,
"id": 1,
"item_shapes": [
{
"shape": [
{
"type": "LineSegment",
"xe": 10.0,
"xs": 0.0,
"ye": 0.0,
"ys": 0.0
},
{
"type": "LineSegment",
"xe": 10.0,
"xs": 10.0,
"ye": 10.0,
"ys": 0.0
},
{
"type": "LineSegment",
"xe": 0.0,
"xs": 10.0,
"ye": 10.0,
"ys": 10.0
},
{
"type": "LineSegment",
"xe": 0.0,
"xs": 0.0,
"ye": 0.0,
"ys": 10.0
}
]
}
],
"mirror": false,
"x": 0.0,
"y": 0.0
},
{
"angle": 0.0,
"id": 0,
"item_shapes": [
{
"shape": [
{
"type": "LineSegment",
"xe": 20.0,
"xs": 10.0,
"ye": 10.0,
"ys": 10.0
},
{
"type": "LineSegment",
"xe": 20.0,
"xs": 20.0,
"ye": 30.0,
"ys": 10.0
},
{
"type": "LineSegment",
"xe": 10.0,
"xs": 20.0,
"ye": 30.0,
"ys": 30.0
},
{
"type": "LineSegment",
"xe": 10.0,
"xs": 10.0,
"ye": 10.0,
"ys": 30.0
}
]
}
],
"mirror": false,
"x": 10.0,
"y": 10.0
}
],
"shape": [
{
"type": "LineSegment",
"xe": 40.0,
"xs": 0.0,
"ye": 0.0,
"ys": 0.0
},
{
"type": "LineSegment",
"xe": 40.0,
"xs": 40.0,
"ye": 30.0,
"ys": 0.0
},
{
"type": "LineSegment",
"xe": 0.0,
"xs": 40.0,
"ye": 30.0,
"ys": 30.0
},
{
"type": "LineSegment",
"xe": 0.0,
"xs": 0.0,
"ye": 0.0,
"ys": 30.0
}
]
}
]
}
18 changes: 18 additions & 0 deletions include/packingsolver/box/instance.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -141,12 +141,27 @@ struct ItemType
inline Volume space() const { return volume(); }

inline bool can_rotate(int rotation) const { return ((rotations >> rotation) & 1); }

/** Number of fixed copies of the item type (pre-placed in bin types). */
ItemPos copies_fixed = 0;
};

std::ostream& operator<<(
std::ostream& os,
const ItemType& item_type);

struct FixedItem
{
/** Item type. */
ItemTypeId item_type_id;

/** Bottom-left corner of the item. */
Point bl_corner;

/** Rotation of the item. */
int rotation;
};

/**
* Bin type structure for a problem of type 'box'.
*/
Expand All @@ -167,6 +182,9 @@ struct BinType
/** Maximum weight. */
Weight maximum_weight = std::numeric_limits<Weight>::infinity();

/** Fixed items pre-placed in every bin of this type. */
std::vector<FixedItem> fixed_items;

/*
* Computed attributes
*/
Expand Down
15 changes: 12 additions & 3 deletions include/packingsolver/box/instance_builder.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -62,8 +62,10 @@ class InstanceBuilder
* This method is used in the column generation procedure.
*/
void add_bin_type(
const BinType& bin_type,
BinPos copies);
const Instance& original_instance,
BinTypeId original_bin_type_id,
BinPos copies,
BinPos copies_min = 0);

/**
* For each bin type, set an infinite x.
Expand Down Expand Up @@ -120,7 +122,8 @@ class InstanceBuilder
* This method is used in the column generation procedure.
*/
void add_item_type(
const ItemType& item_type,
const Instance& original_instance,
ItemTypeId original_item_type_id,
Profit profit,
ItemPos copies);

Expand Down Expand Up @@ -175,6 +178,12 @@ class InstanceBuilder
/** Instance. */
Instance instance_;

/** Mapping from original bin type IDs to sub-instance bin type IDs. */
std::vector<BinTypeId> orig_to_sub_bin_type_ids_;

/** Mapping from original item type IDs to sub-instance item type IDs. */
std::vector<ItemTypeId> orig_to_sub_item_type_ids_;

};

}
Expand Down
21 changes: 21 additions & 0 deletions include/packingsolver/boxstacks/instance.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -219,12 +219,30 @@ struct ItemType
inline Volume space() const { return volume(); }

inline bool can_rotate(int rotation) const { return ((rotations >> rotation) & 1); }

/** Number of fixed copies of the item type (pre-placed in bin types). */
ItemPos copies_fixed = 0;
};

std::ostream& operator<<(
std::ostream& os,
const ItemType& item_type);

struct FixedItem
{
/** Item type. */
ItemTypeId item_type_id;

/** Position of the bottom-left corner of the stack. */
Point bl_corner;

/** Initial z-coordinate of the item. */
Length z_start;

/** Rotation of the item. */
int rotation;
};

/**
* Bin type structure for a problem of type 'boxstacks'.
*/
Expand Down Expand Up @@ -258,6 +276,9 @@ struct BinType
/** Semi-trailer truck data. */
SemiTrailerTruckData semi_trailer_truck_data;

/** Fixed items pre-placed in every bin of this type. */
std::vector<FixedItem> fixed_items;

/*
* Computed attributes
*/
Expand Down
15 changes: 12 additions & 3 deletions include/packingsolver/boxstacks/instance_builder.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -91,8 +91,10 @@ class InstanceBuilder
* This method is used in the column generation procedure.
*/
void add_bin_type(
const BinType& bin_type,
BinPos copies);
const Instance& original_instance,
BinTypeId original_bin_type_id,
BinPos copies,
BinPos copies_min = 0);

/**
* For each bin type, set an infinite x.
Expand Down Expand Up @@ -174,7 +176,8 @@ class InstanceBuilder
* This method is used in the column generation procedure.
*/
void add_item_type(
const ItemType& item_type,
const Instance& original_instance,
ItemTypeId original_item_type_id,
Profit profit,
ItemPos copies);

Expand Down Expand Up @@ -229,6 +232,12 @@ class InstanceBuilder
/** Instance. */
Instance instance_;

/** Mapping from original bin type IDs to sub-instance bin type IDs. */
std::vector<BinTypeId> orig_to_sub_bin_type_ids_;

/** Mapping from original item type IDs to sub-instance item type IDs. */
std::vector<ItemTypeId> orig_to_sub_item_type_ids_;

};

}
Expand Down
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