1 files changed, 111 insertions, 0 deletions
diff --git a/src/systems/grid.js b/src/systems/grid.js
new file mode 100644
index 0000000..4082793
--- /dev/null
+++ b/src/systems/grid.js
@@ -0,0 +1,111 @@
+game.system.Grid = (entitiesGrid) => {
+  let gridWidth = game.canvas.width / game.config.xDim;
+  let gridHeight = game.canvas.height / game.config.yDim;
+
+  const gameCoordsToGrid = ({ x, y }) => {
+    return { x: Math.floor((x+gridWidth/2) / game.canvas.width * game.config.yDim), y: Math.floor((y+gridHeight/2) / game.canvas.height * game.config.yDim) };
+  };
+
+  const gridCoordsToGame = ({ x, y }) => {
+    return { x: x * gridWidth, y: y * gridHeight };
+  };
+
+  const rebuildGrid = (entities) => {
+    let changedIds = new Set();
+    entities.map(entity => {
+      const { x, y } = entity.components.gridPosition;
+      if (!entitiesGrid[y][x].has(entity.id)) {
+        changedIds.add(entity.id);
+      }
+    });
+    entitiesGrid.forEach((row) => row.forEach((entitiesInCell) => {
+      for (let id of entitiesInCell.keys()) {
+        if (changedIds.has(id)) {
+          entitiesInCell.delete(id);
+        }
+      }
+    }));
+    changedIds.forEach(id => {
+      const entity = entities[id];
+      const { x, y } = entity.components.gridPosition;
+      entitiesGrid[y][x].set(entity.id, entity);
+    });
+  }
+
+  const update = (_elapsedTime, entities, changedIds) => {
+    gridEntities = Object.keys(entities).filter((x) => entities[x].hasComponent("gridPosition")).map((x) => entities[x]);
+    const thisChangedIds = new Set();
+    gridEntities.map((entity) => {
+      if (entity.hasComponent("appearance")) {
+        entity.components.appearance.width = gridWidth;
+        entity.components.appearance.height = gridHeight;
+      }
+      if (entity.hasComponent("gridPosition")) {
+        const oldGridCoords = entity.components.gridPosition;
+        if (entity.hasComponent("position")) {
+          const gameCoords = gridCoordsToGame(entity.components.gridPosition);
+          if (Math.abs(entity.components.position.x - gameCoords.x) >= gridWidth/2 || Math.abs(entity.components.position.y - gameCoords.y) >= gridHeight/2) {
+            entity.components.gridPosition = gameCoordsToGrid(entity.components.position);
+            if (entity.hasComponent("momentum")) {
+              entity.removeComponent("momentum");
+            }
+          }
+        }
+        if (!entity.hasComponent("position") || !equivalence(entity.components.gridPosition, oldGridCoords)) {
+          entity.components.position = {
+            ...entity.components.position,
+            ...gridCoordsToGame(entity.components.gridPosition)
+          };
+          thisChangedIds.add(entity.id);
+        }
+      }
+    });
+    rebuildGrid(gridEntities);
+    return thisChangedIds;
+  };
+
+
+  return { gameCoordsToGrid, gridCoordsToGame, update, gridWidth, gridHeight };
+};
+
+//
+//
+//          
+//          const proposed = {...newGridCoords};
+//          let wall = false;
+//          let entitiesToPush = [];
+//          if (entity.hasComponent("controllable")) {
+//            let found = false;
+
+//
+//          if (entity.hasComponent("controllable")) {
+//            if (!wall) {
+//              entity.components.gridPosition = {...entity.components.gridPosition, ...newGridCoords};
+//              entitiesToPush.map((e) => e.addComponent(game.components.Momentum({...momentumVector})));
+//            }
+//            const particles = game.createBorderParticles({
+//              colors: ["#FF0000", "#00FF00", "#0000FF", "#FFFF00", "#FF00FF", "#00FFFF"],
+//              maxAmount: 100,
+//              minAmount: 25,
+//              minLife: 100,
+//              maxLife: 300,
+//              minRadius: 1,
+//              maxRadius: 3,
+//              maxSpeed: 0.15,
+//            });
+//            particles.addComponent(game.components.Position(gridCoordsToGame(oldGridCoords)));
+//            particles.addComponent(game.components.Appearance({width: 50, height: 50}));
+//            game.entities[particles.id] = particles;
+//          } else {
+//            entity.components.gridPosition = {...entity.components.gridPosition, ...newGridCoords};
+//          }
+//
+//
+//          
+//
+//          
+//        }
+//      } else {
+//        entity.addComponent(game.components.Position({...gridCoordsToGame(entity.components.gridPosition)}));    
+//      };
+//    });
+\ No newline at end of file