82 lines
2.0 KiB
Dart
82 lines
2.0 KiB
Dart
part of 'sitemode.dart';
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const double fovMaxMovementCost = 10.0;
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const double fovMaxMemoryDistance = 80.0;
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extension FOVParts on SiteMode {
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void fovMaintain() {
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fovVisible = {};
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shadowcast(playerPosition, _fovIsBlocking, (xy) => fovVisible.add(xy));
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var oldFovMemory = fovMemory;
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fovMemory = {};
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oldFovMemory.addAll(fovVisible);
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for (var xy in oldFovMemory) {
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if (_fovMemorablyClose(xy)) {
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fovMemory.add(xy);
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}
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}
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fovMovable = {};
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for (var r in dijkstra<geo.Offset>(playerPosition, _fovDijkstraNeighbors)) {
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if (r.cost > fovMaxMovementCost) {
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break;
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}
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fovMovable.add(r.item);
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}
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}
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bool _fovMemorablyClose(geo.Offset other) {
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var dx = (other.x - playerPosition.x).toDouble();
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var dy = (other.y - playerPosition.y).toDouble();
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return math.sqrt(dx * dx + dy * dy) < fovMaxMemoryDistance;
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}
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bool _fovKnown(geo.Offset other) {
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return fovVisible.contains(other) || fovMemory.contains(other);
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}
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bool _fovIsBlocking(geo.Offset xy) {
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switch (level.tiles.get(xy.x, xy.y)) {
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case null:
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return true;
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case LevelTile.exit:
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return true;
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case LevelTile.openDoor:
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case LevelTile.floor:
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return false;
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case LevelTile.wall:
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return true;
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case LevelTile.closedDoor:
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return true;
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}
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}
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Iterable<Edge<geo.Offset>> _fovDijkstraNeighbors(geo.Offset xy) sync* {
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var tile = level.tiles.get(xy.x, xy.y);
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if (tile == LevelTile.exit || tile == LevelTile.closedDoor) {
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// can't go anywhere after this
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return;
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}
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for (var (dx, dy) in [(-1, 0), (1, 0), (0, -1), (0, 1)]) {
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var xy2 = geo.Offset(xy.x + dx, xy.y + dy);
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// Only return visible or remembered tiles
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if (!_fovKnown(xy2)) {
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continue;
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}
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var tile = level.tiles.get(xy2.x, xy2.y);
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if (tile == LevelTile.wall) {
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continue;
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}
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// for now, because exiting isn't implemented
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if (tile == LevelTile.exit) {
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continue;
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}
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yield Edge(1.0, xy2);
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}
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}
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}
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