Release 0.1 of Escape from Proxima 5.

LICENSE

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README.md

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+
+ESCAPE FROM PROXIMA 5
+---------------------
+
+Version 0.1
+
+(For the in-game backstory, see story.txt.)
+
+To build it:  ./rebuild.sh
+
+THIS GAME IS A WORK IN PROGRESS; PROBABLY OF LITTLE ACTUAL PLAYABLE VALUE
+OTHER THAN AS A NOVELTY.
+
+Only a single game level is implemented so far.
+
+I built this intending to show off the capabilities of my Tcell package for
+Go (the library used for "terminal" graphics under the hood.)
+
+I got kind of caught up in it, and now there is a pretty powerful game engine
+under the hood.  There is full support for animated sprites, with collision
+detection, layering, etc.  And I've made some pretty cool visual effects too.
+
+It runs in a text window.  You want a reasonably big window (80x25 will work,
+but its harder to play with smaller screens), and you'll want a fast display.
+
+You'll also want a color terminal -- 256 color support in xterm or Terminal
+is highly recommended.  Oh, and if you can, try to use a UTF-8 locale.  The
+game will work in basic ASCII with black and white, and it isn't completely
+garbage in that mode, but its *soo* much better with a more capable terminal.
+
+Oh, don't try to run this over a 300 baud modem.  You won't be happy.
+
+Local terminals work fine.  9600 baud is probably pushing it. I haven't
+tested anything other than local connections; there are a lot of display
+updates in the game, so you do want to have a reasonably fast display.
+You can reduce the screen size if its too slow, that may help a little.
+
+Much of the code here will probably get cleaned up and structured properly
+for reuse in nice library form.  Probably sub-packages under Tcell, for both
+the dynamic views and probably also the sprite management code and maybe even
+the full game loop.

alarm.go

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+// Copyright 2015 Garrett D'Amore
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"time"
+)
+
+// Alarm represents an alarm event.
+type Alarm struct {
+	expire time.Time
+	h      EventHandler
+}
+
+// AlarmClock manages Alarms.  Each Alarm is set on a clock, and a
+// single AlarmClock can have unlimited alarms registered with it.
+// However, the actual alarms only ring (run the handlers) when the
+// AlarmClock's Tick method is executed; no implicit asynchronous
+// handling is performed.
+type AlarmClock map[*Alarm]struct{}
+
+// NewAlarmClock creates an AlarmClock.
+func NewAlarmClock() AlarmClock {
+	return AlarmClock{}
+}
+
+// Schedule schedules an alarm to fire after the duration has expired.
+func (c AlarmClock) Schedule(d time.Duration, h EventHandler) *Alarm {
+	a := &Alarm{expire: time.Now().Add(d), h: h}
+	c[a] = struct{}{}
+	return a
+}
+
+// Cancel cancels a previously scheduled alarm.
+func (c AlarmClock) Cancel(a *Alarm) {
+	delete(c, a)
+}
+
+// Tick runs through the list of alarms on this clock,, and runs the
+// event handler for any that have expired.  Any alarm that is fired
+// is descheduled.  Note that handlers all run synchornously within
+// the caller's context.
+func (c AlarmClock) Tick(now time.Time) {
+	for a := range c {
+		if a.expire.Before(now) {
+			delete(c, a)
+			ev := &EventAlarm{when: now}
+			a.h.HandleEvent(ev)
+		}
+	}
+}
+
+// Reset resets the clock, clearing all alarms.
+func (c AlarmClock) Reset() {
+	for a := range c {
+		delete(c, a)
+	}
+}
+
+// EventAlarm is dispatched to the handler for an Alarm.
+type EventAlarm struct {
+	when time.Time
+}
+
+// When returns the time when the alarm fired.
+func (ev *EventAlarm) When() time.Time {
+	return ev.when
+}