v0.1.0 initial commit

game/action.go

@@ -0,0 +1,54 @@
+package game
+
+import (
+	"time"
+)
+
+// Action is a platform-neutral semantic input action, dispatched to the
+// engine independent of the originating input device (keyboard, touch, etc)
+type Action uint8
+
+const (
+	ActionNone      Action = iota
+	ActionMoveLeft         // grid: dx=-1
+	ActionMoveUp           // grid: dy=-1
+	ActionMoveDown         // grid: dy=+1
+	ActionMoveRight        // grid: dx=+1
+
+	// Reserved, behavior defined later
+	ActionStubSemicolon
+	ActionStubA
+	ActionStubS
+	ActionStubD
+	ActionStubF
+	ActionSpace
+	ActionConfirm
+)
+
+// Dispatch applies a single Action to the game state, gated by phase.
+// Requires current time to timestamp temporal state shifts
+func (gs *GameState) Dispatch(a Action, now time.Time) {
+	if gs.Paused {
+		return
+	}
+	switch gs.Phase {
+	case PhaseGameOver:
+		if a == ActionConfirm {
+			gs.restart(now)
+		}
+		return
+	case PhaseLevelClear:
+		return // input inert during transition
+	}
+
+	switch a {
+	case ActionMoveLeft:
+		gs.MovePlayer(0, -1, now)
+	case ActionMoveUp:
+		gs.MovePlayer(-1, 0, now)
+	case ActionMoveDown:
+		gs.MovePlayer(1, 0, now)
+	case ActionMoveRight:
+		gs.MovePlayer(0, 1, now)
+	}
+}