writing a real-time multiplayer game - matthew luard
TRANSCRIPT
![Page 1: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/1.jpg)
![Page 2: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/2.jpg)
![Page 3: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/3.jpg)
![Page 4: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/4.jpg)
![Page 5: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/5.jpg)
![Page 6: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/6.jpg)
![Page 7: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/7.jpg)
![Page 8: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/8.jpg)
![Page 9: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/9.jpg)
![Page 10: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/10.jpg)
![Page 11: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/11.jpg)
![Page 12: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/12.jpg)
![Page 13: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/13.jpg)
![Page 14: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/14.jpg)
![Page 15: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/15.jpg)
![Page 16: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/16.jpg)
![Page 17: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/17.jpg)
![Page 18: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/18.jpg)
![Page 19: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/19.jpg)
![Page 20: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/20.jpg)
![Page 21: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/21.jpg)
![Page 22: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/22.jpg)
![Page 23: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/23.jpg)
![Page 24: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/24.jpg)
![Page 25: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/25.jpg)
![Page 26: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/26.jpg)
![Page 27: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/27.jpg)
![Page 28: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/28.jpg)
![Page 29: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/29.jpg)
![Page 30: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/30.jpg)
![Page 31: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/31.jpg)
![Page 32: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/32.jpg)
![Page 33: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/33.jpg)
![Page 34: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/34.jpg)
![Page 35: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/35.jpg)
![Page 36: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/36.jpg)
![Page 37: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/37.jpg)
![Page 38: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/38.jpg)
![Page 39: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/39.jpg)
cdef object get_lowest(set objects): cdef int current cdef int lowest = -1 cdef Tile lowest_object cdef Tile item for item in objects: current = item.H if lowest == -1 or current < lowest: lowest = current lowest_object = item return lowest_object def aStar(dict graph, Tile current, Tile end): cdef set openList = set() cdef set closedList = set() current.parent = None openList.add(current) cdef list retrace cdef Tile tile while len(openList) > 0: current = get_lowest(openList) if current is end: retrace = [] while current: retrace.insert(0, current) #change return representation here current = current.parent return retrace openList.discard(current) closedList.add(current) for tile in <list>(graph[current]): if tile not in closedList: tile.H = (abs(end.x-tile.x)+abs(end.y-tile.y))*10 openList.add(tile) tile.parent = current return []
def aStar(self, graph, current, end): open = [] closed = [] path = [] def retracePath(c): path.insert(0,c) if c.parent == None: return retracePath(c.parent) open.append(current) while len(open) is not 0: current = min(open, key=lambda inst:inst.H) if current == end:
![Page 40: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/40.jpg)
return retracePath(current) open.remove(current) closed.append(current) for tile in graph[current]: if tile not in closed: tile.H = (abs(end.x-tile.x)+abs(end.y-tile.y))*10 if tile not in open: open.append(tile) tile.parent = current return path
// Base implementation used from code by Mwjuhl at https://code.google.com/p/a-star-java/source/browse/AStar/src/aStar/AStar.java, altered somewhat to be as similar to Python implementations as possible. public Path calcShortestPath(int startX, int startY, int goalX, int goalY) { map.getStartNode().setDistanceFromStart(0); closedList.clear(); openList.clear(); openList.add(map.getStartNode()); while(openList.size() != 0) { Node current = openList.getFirst(); // check if our current Node location is the goal Node. If it is, we are done. if(current.getX() == map.getGoalLocationX() && current.getY() == map.getGoalLocationY()) { return remakePath(current); } //move current Node to the closed (already searched) list openList.remove(current); closedList.add(current); //go through all the current Nodes neighbors and calculate if one should be our next step for(Node neighbor : current.getNeighborList()) { boolean neighborIsBetter; // searched list? if (closedList.contains(neighbor)) continue; if (!neighbor.isObstacle) { float neighborDistanceFromStart = (current.getDistanceFromStart() + map.getDistanceBetween(current, neighbor)); // add to open list if it doesn't already have it if(!openList.contains(neighbor)) { openList.add(neighbor); neighbor.setPreviousNode(current); neighbor.setDistanceFromStart(neighborDistanceFromStart); neighbor.setHeuristicDistanceFromGoal(heuristic.getEstimatedDistanceToGoal(
![Page 41: Writing a real-time multiplayer game - Matthew Luard](https://reader031.vdocument.in/reader031/viewer/2022022416/5868d98b1a28abb9568bdcdb/html5/thumbnails/41.jpg)
neighbor.getX(), neighbor.getY(), map.getGoalLocationX(), map.getGoalLocationY())); } } } return null; }