Find chest openings within interaction range

mosfet/game.py

@@ -385,7 +385,7 @@ class LegacyGame:
         packet.face = 1
         self.g.connection.write_packet(packet)
 
-    def open_container(self, location):
+    def open_container(self, location, face=BlockFace.TOP, cursor=None):
         location = tuple(int(value) for value in location)
         positions = {location}
         world = self.g.get('world')
@@ -399,7 +399,7 @@ class LegacyGame:
             'positions': tuple(sorted(positions)),
             'requested_at': time.monotonic(),
         }
-        self.place_block(location, BlockFace.TOP)
+        self.place_block(location, face, cursor=cursor)
 
     def handle_window(self, packet):
         print(packet)
@@ -1048,14 +1048,16 @@ class Game(LegacyGame):
         return True
 
     def place_block(self, location, face, hand=0, cursor_y=None,
-                    sneaking=False):
+                    sneaking=False, cursor=None):
         location = tuple(int(value) for value in location)
+        if cursor is None:
             if cursor_y is None:
                 cursor_y = 0.99 if int(face) == 1 else 0.5
+            cursor = (0.5, cursor_y, 0.5)
         packet = UseItemOnBlockPacket(
             hand=hand, location=location, face=int(face),
-            cursor_x=0.5, cursor_y=cursor_y,
+            cursor_x=float(cursor[0]), cursor_y=float(cursor[1]),
-            cursor_z=0.5, inside_block=False, world_border_hit=False,
+            cursor_z=float(cursor[2]), inside_block=False, world_border_hit=False,
             sequence=self._next_sequence())
         if sneaking:
             self.g.connection.write_packet(PlayerInputPacket(flags=0x20),

mosfet/jobs/cache_items.py

@@ -69,12 +69,13 @@ class CacheItemsStates:
             self.area = container['position']
             self.container_item_ids = container['item_ids']
             self.is_labeled_container = True
-            for opening in w.find_cache_openings(self.area):
+            for opening in w.find_cache_openings(self.area, p):
-                navpath = w.path_to_place(p, opening)
+                navpath = w.path_to_place(p, opening['position'])
                 if navpath:
                     print('Going to labeled chest', container['labels'],
                           self.area)
-                    self.opening = opening
+                    self.opening = opening['position']
+                    self.open_interaction = opening
                     self.g.path = navpath
                     self.state = self.going_to_trapped_chest
                     return
@@ -96,11 +97,12 @@ class CacheItemsStates:
         chest = self.trapped_chests[0]
         self.area = chest
 
-        for opening in w.find_cache_openings(chest):
+        for opening in w.find_cache_openings(chest, p):
-            navpath = w.path_to_place(p, opening)
+            navpath = w.path_to_place(p, opening['position'])
             if navpath:
                 print('navpath to trapped chest:', navpath)
-                self.opening = opening
+                self.opening = opening['position']
+                self.open_interaction = opening
                 self.g.path = navpath
                 self.state = self.going_to_trapped_chest
                 return
@@ -110,12 +112,12 @@ class CacheItemsStates:
 
     def going_to_trapped_chest(self):
         if utils.pint(self.g.pos) == self.opening:
-            self.g.look_at = self.area
+            self.g.look_at = self.open_interaction['look_at']
             self.wait_time = 0.5
             self.state = self.turn_to_trapped_chest
 
     def turn_to_trapped_chest(self):
-        self.g.look_at = self.area
+        self.g.look_at = self.open_interaction['look_at']
         self.wait_time -= utils.TICK
         if self.wait_time <= 0:
             self.state = self.open_chest
@@ -144,12 +146,14 @@ class CacheItemsStates:
             return
 
         self.area = area
-        openings = w.find_cache_openings(self.area)
+        openings = w.find_cache_openings(self.area, p)
 
-        for o in openings:
+        for opening in openings:
-            navpath = w.path_to_place(p, o)
+            navpath = w.path_to_place(p, opening['position'])
-            self.opening = o
+            if navpath:
-            if navpath: break
+                self.opening = opening['position']
+                self.open_interaction = opening
+                break
         else: # for
             print('Unable to get to cache area', self.area)
             self.bad_areas.append(self.area)
@@ -161,12 +165,12 @@ class CacheItemsStates:
 
     def going_to_area(self):
         if utils.pint(self.g.pos) == self.opening:
-            self.g.look_at = self.area
+            self.g.look_at = self.open_interaction['look_at']
             self.wait_time = 0.5
             self.state = self.turn_to_cache_spot
 
     def turn_to_cache_spot(self):
-        self.g.look_at = self.area
+        self.g.look_at = self.open_interaction['look_at']
         self.wait_time -= utils.TICK
         if self.wait_time <= 0:
             self.state = self.place_chest
@@ -180,7 +184,10 @@ class CacheItemsStates:
         print('Opening chest')
         self.failed_transfer_slots.clear()
         self.pending_transfer = None
-        self.g.game.open_container(self.area)
+        self.g.game.open_container(
+            self.open_interaction['target'],
+            face=self.open_interaction['face'],
+            cursor=self.open_interaction['cursor'])
         self.wait_time = 1
         self.state = self.wait
 
@@ -368,6 +375,7 @@ class CacheItemsStates:
         self.container_item_ids = None
         self.area = None
         self.opening = None
+        self.open_interaction = None
         self.trapped_chests = []
         self.bad_areas = []
         self.wait_time = 0

mosfet/world.py

@@ -3,6 +3,7 @@ import json
 import re
 import time
 import random
+from math import floor
 from itertools import count
 from copy import copy
 
@@ -11,6 +12,10 @@ from mosfet import path
 from mosfet.info import blocks
 from mosfet.info import items
 from mosfet.info import mobs
+from minecraft.networking.types import BlockFace
+
+CHEST_OPENING_RADIUS = 3
+
 
 class World:
     def __init__(self, global_state):
@@ -625,8 +630,191 @@ class World:
             self._bed_occupancy_states[bed] = occupied
         return occupied
 
-    def find_cache_openings(self, area):
+    @staticmethod
-        return self.find_bed_openings(area)
+    def _is_chest_state(state_id):
+        name = blocks.BLOCKS.get(state_id)
+        return (name is not None and name != 'ender_chest' and
+                (name == 'chest' or name.endswith('_chest')))
+
+    def _cache_opening_standable(self, position):
+        at_feet = self.block_at(*position)
+        above = self.block_at(*utils.padd(position, path.BLOCK_ABOVE))
+        below = self.block_at(*utils.padd(position, path.BLOCK_BELOW))
+        return (at_feet in blocks.NON_SOLID_IDS and
+                at_feet not in blocks.AVOID_IDS and
+                above in blocks.NON_SOLID_IDS and
+                above not in blocks.AVOID_IDS and
+                below is not None and
+                below not in blocks.NON_SOLID_IDS and
+                below not in blocks.AVOID_IDS)
+
+    @staticmethod
+    def _segment_intersects_aabb(start, end, minimum, maximum):
+        lower, upper = 0.0, 1.0
+        for axis in range(3):
+            origin = start[axis]
+            delta = end[axis] - origin
+            if abs(delta) < 1e-9:
+                if origin < minimum[axis] or origin > maximum[axis]:
+                    return False
+                continue
+            first = (minimum[axis] - origin) / delta
+            second = (maximum[axis] - origin) / delta
+            if first > second:
+                first, second = second, first
+            lower = max(lower, first)
+            upper = min(upper, second)
+            if lower > upper:
+                return False
+        return upper >= 0.0 and lower <= 1.0
+
+    def _has_cache_line_of_sight(self, start, end, target):
+        first = tuple(floor(min(start[i], end[i])) for i in range(3))
+        last = tuple(floor(max(start[i], end[i])) for i in range(3))
+        for x in range(first[0], last[0] + 1):
+            for y in range(first[1], last[1] + 1):
+                for z in range(first[2], last[2] + 1):
+                    position = (x, y, z)
+                    if position == target:
+                        continue
+                    if not self._segment_intersects_aabb(
+                            start, end, position, utils.padd(position, (1, 1, 1))):
+                        continue
+                    state_id = self.block_at(*position)
+                    if state_id is None:
+                        return False
+                    for box in blocks.COLLISION_BOXES.get(state_id, ()):
+                        minimum = (x + box[0], y + box[1], z + box[2])
+                        maximum = (x + box[3], y + box[4], z + box[5])
+                        if self._segment_intersects_aabb(
+                                start, end, minimum, maximum):
+                            return False
+        return True
+
+    @staticmethod
+    def _chest_interaction_points(target, boxes):
+        points = []
+        for box in boxes:
+            x0, y0, z0, x1, y1, z1 = box
+            xm, zm = (x0 + x1) / 2, (z0 + z1) / 2
+            for fraction in (0.2, 0.5, 0.8):
+                y = y0 + (y1 - y0) * fraction
+                points.extend((
+                    (target[0] + xm, target[1] + y, target[2] + z0),
+                    (target[0] + xm, target[1] + y, target[2] + z1),
+                    (target[0] + x0, target[1] + y, target[2] + zm),
+                    (target[0] + x1, target[1] + y, target[2] + zm),
+                ))
+            for x_fraction, z_fraction in (
+                    (0.25, 0.25), (0.25, 0.75),
+                    (0.75, 0.25), (0.75, 0.75), (0.5, 0.5)):
+                points.append((
+                    target[0] + x0 + (x1 - x0) * x_fraction,
+                    target[1] + y1,
+                    target[2] + z0 + (z1 - z0) * z_fraction,
+                ))
+        return points
+
+    @staticmethod
+    def _ray_chest_surface_hit(start, end, target, boxes):
+        negative_faces = (BlockFace.WEST, BlockFace.BOTTOM, BlockFace.NORTH)
+        positive_faces = (BlockFace.EAST, BlockFace.TOP, BlockFace.SOUTH)
+        delta = tuple(end[i] - start[i] for i in range(3))
+        hits = []
+        for box in boxes:
+            minimum = tuple(target[i] + box[i] for i in range(3))
+            maximum = tuple(target[i] + box[i + 3] for i in range(3))
+            enter, leave = float('-inf'), float('inf')
+            entering_face = None
+            for axis in range(3):
+                if abs(delta[axis]) < 1e-9:
+                    if (start[axis] < minimum[axis] or
+                            start[axis] > maximum[axis]):
+                        break
+                    continue
+                near = (minimum[axis] - start[axis]) / delta[axis]
+                far = (maximum[axis] - start[axis]) / delta[axis]
+                face = negative_faces[axis]
+                if near > far:
+                    near, far = far, near
+                    face = positive_faces[axis]
+                if near > enter:
+                    enter = near
+                    entering_face = face
+                leave = min(leave, far)
+                if enter > leave:
+                    break
+            else:
+                if entering_face is None or enter < 0 or enter > 1:
+                    continue
+                hit_point = tuple(start[i] + delta[i] * enter
+                                  for i in range(3))
+                cursor = tuple(hit_point[i] - target[i] for i in range(3))
+                hits.append((enter, entering_face, cursor, hit_point))
+        if not hits:
+            return None
+        _distance, face, cursor, hit_point = min(hits, key=lambda hit: hit[0])
+        return face, cursor, hit_point
+
+    def find_cache_openings(self, area, center=None, radius=None):
+        """Find standable nearby spots with a clear ray to a chest surface."""
+        area = tuple(area)
+        center = tuple(center if center is not None else area)
+        radius = CHEST_OPENING_RADIUS if radius is None else radius
+        state_id = self.block_at(*area)
+        targets = (self._double_chest_positions(area)
+                   if self._is_chest_state(state_id) else (area,))
+        default_chest = min(blocks.CHEST_IDS)
+        interactions = {}
+
+        for target in targets:
+            target_state = self.block_at(*target)
+            boxes = blocks.COLLISION_BOXES.get(target_state) or \
+                blocks.COLLISION_BOXES[default_chest]
+            hit_points = self._chest_interaction_points(target, boxes)
+            for horizontal in utils.search_2d(radius + 1):
+                for dy in range(-radius - 1, radius + 2):
+                    offset = (horizontal[0], dy, horizontal[2])
+                    opening = utils.padd(target, offset)
+                    if (opening in targets or
+                            not self._cache_opening_standable(opening)):
+                        continue
+                    eye = (opening[0] + 0.5, opening[1] + 1.62,
+                           opening[2] + 0.5)
+                    for aim_point in hit_points:
+                        if not self._has_cache_line_of_sight(
+                                eye, aim_point, target):
+                            continue
+                        hit = self._ray_chest_surface_hit(
+                            eye, aim_point, target, boxes)
+                        if hit is None:
+                            continue
+                        face, cursor, hit_point = hit
+                        hit_distance = utils.phyp(eye, hit_point)
+                        if hit_distance > radius:
+                            continue
+                        interaction = {
+                            'position': opening,
+                            'target': target,
+                            'face': face,
+                            'cursor': cursor,
+                            'hit_point': hit_point,
+                            'look_at': tuple(value - 0.5
+                                             for value in hit_point),
+                        }
+                        distance = utils.phyp(center, opening)
+                        interaction['distance'] = distance
+                        interaction['hit_distance'] = hit_distance
+                        previous = interactions.get(opening)
+                        if (previous is None or
+                                interaction['hit_distance'] <
+                                previous['hit_distance']):
+                            interactions[opening] = interaction
+                        break
+
+        return sorted(interactions.values(),
+                      key=lambda result: (result['distance'],
+                                          result['position']))
 
     def find_objects(self, object_ids):
         result = []

tests/test_cache_openings.py

@@ -0,0 +1,88 @@
+import unittest
+from munch import Munch
+
+from minecraft.networking.types import BlockFace
+
+from mosfet.info import blocks
+from mosfet.world import CHEST_OPENING_RADIUS, World
+
+
+class FakeChunks:
+    def __init__(self, states):
+        self.states = states
+
+    def get_block_at(self, x, y, z):
+        return self.states.get((x, y, z), blocks.AIR)
+
+
+class CacheOpeningTests(unittest.TestCase):
+    def setUp(self):
+        self.chest = (0, 64, 0)
+        chest_state = min(blocks.CHEST_IDS)
+        stone = blocks.STONE
+        states = {self.chest: chest_state}
+        for x in range(-4, 5):
+            for z in range(-4, 5):
+                states[(x, 63, z)] = stone
+        self.world = World(Munch(chunks=FakeChunks(states)))
+
+    def test_openings_include_visible_positions_up_to_configured_radius(self):
+        opening = (3, 64, 0)
+        openings = self.world.find_cache_openings(
+            self.chest, center=(3, 64, 0))
+        by_position = {tuple(candidate['position']): candidate
+                       for candidate in openings}
+
+        self.assertEqual(CHEST_OPENING_RADIUS, 3)
+        self.assertIn(opening, by_position)
+        self.assertTrue(all(candidate['hit_distance'] <= CHEST_OPENING_RADIUS
+                            for candidate in openings))
+        self.assertIn(by_position[opening]['face'], (
+            BlockFace.NORTH, BlockFace.SOUTH, BlockFace.WEST,
+            BlockFace.EAST, BlockFace.TOP,
+        ))
+        self.assertEqual(len(by_position[opening]['cursor']), 3)
+
+    def test_range_is_measured_from_eye_to_interaction_surface(self):
+        opening = (3, 63, 0)
+        self.world.g.chunks.states[opening] = blocks.AIR
+        self.world.g.chunks.states[(3, 62, 0)] = blocks.STONE
+
+        openings = self.world.find_cache_openings(
+            self.chest, center=opening)
+        by_position = {tuple(candidate['position']): candidate
+                       for candidate in openings}
+
+        self.assertIn(opening, by_position)
+        self.assertLessEqual(by_position[opening]['hit_distance'], 3)
+
+    def test_sign_collision_shape_does_not_block_sight_but_solid_block_does(self):
+        start = (3.5, 65.62, 0.5)
+        target = (0.5, 64.875, 0.5)
+        sign_state = blocks.MCD_BLOCKS['oak_sign']['minStateId']
+        obstruction = (1, 65, 0)
+        self.world.g.chunks.states[obstruction] = sign_state
+
+        self.assertTrue(self.world._has_cache_line_of_sight(
+            start, target, self.chest))
+
+        self.world.g.chunks.states[obstruction] = blocks.STONE
+        self.assertFalse(self.world._has_cache_line_of_sight(
+            start, target, self.chest))
+
+    def test_virtual_chest_openings_are_found_before_placement(self):
+        target = (0, 65, 0)
+        for x in range(-3, 4):
+            for z in range(-3, 4):
+                self.world.g.chunks.states[(x, 64, z)] = blocks.STONE
+
+        openings = self.world.find_cache_openings(
+            target, center=(3, 65, 0))
+
+        self.assertTrue(openings)
+        self.assertTrue(all(candidate['target'] == target
+                            for candidate in openings))
+
+
+if __name__ == '__main__':
+    unittest.main()

tests/test_chest_detection.py

@@ -93,8 +93,8 @@ class ChestDetectionTests(unittest.TestCase):
             chunks=Munch(get_block_at=lambda *_position: None),
             world=Munch(_double_chest_positions=lambda _position:
                         (self.position,)))
-        game.place_block = lambda location, face: sent.append(
+        game.place_block = lambda location, face, **kwargs: sent.append(
-            (location, face))
+            (location, face, kwargs))
 
         game.open_container(self.position)
 

tests/test_sneak_placement.py

@@ -2,7 +2,9 @@ import unittest
 from munch import Munch
 
 from minecraft.networking.modern import ClientTickEnd, UseItemOnBlockPacket
+from minecraft.networking.types import BlockFace
 from mosfet.game import Game
+from mosfet.info import blocks
 from mosfet.protocol.modern import PlayerInputPacket
 
 
@@ -15,6 +17,28 @@ class FakeConnection:
 
 
 class SneakPlacementTests(unittest.TestCase):
+    def test_open_container_sends_visible_face_and_hit_cursor(self):
+        chest = (2, 65, -4)
+        connection = FakeConnection()
+        game = Game.__new__(Game)
+        game.g = Munch(
+            connection=connection,
+            chunks=Munch(get_block_at=lambda *position:
+                         min(blocks.CHEST_IDS) if tuple(position) == chest
+                         else None),
+            world=Munch())
+        game.sequence = 0
+
+        game.open_container(
+            chest, face=BlockFace.EAST, cursor=(0.9375, 0.5, 0.5))
+
+        packet = next(packet for packet, _force in connection.packets
+                      if isinstance(packet, UseItemOnBlockPacket))
+        self.assertEqual(packet.location, chest)
+        self.assertEqual(packet.face, BlockFace.EAST)
+        self.assertEqual((packet.cursor_x, packet.cursor_y, packet.cursor_z),
+                         (0.9375, 0.5, 0.5))
+
     def test_sneaking_wraps_block_placement_and_is_released(self):
         connection = FakeConnection()
         game = Game.__new__(Game)