积少成多Flash(5) - ActionScript 3.0 实例之闹钟(自定义事件, 画图, 动画)

package    
{ 
        import flash.events.Event; 
         
        public class AlarmEvent extends Event    
        { 
                // 定义事件类型 
                public static const ALARM:String = "alarm"; 
                 
                // 定义闹钟在响铃时所显示的信息 
                public var alermMessage:String; 
                 
                // 构造函数，msg 为提醒信息 
                public function AlarmEvent(msg:String = "ALARM!") 
                { 
                        // 调用父类的构造函数。参数为事件类型，可以作为 Event.type 访问 
                        super(ALARM); 
         
                        alermMessage = msg; 
                } 
                 
                // 重写 Event 的 clone() 方法 
                public override function clone():Event 
                { 
                        return new AlarmEvent(alermMessage); 
                } 
                 
                // 重写 Event 的 toString() 方法 
                public override function toString():String 
                { 
                        // Event.formatToString() - 在自定义 Event 类中实现 toString() 方法的 utility 函数 
                        return formatToString("AlarmEvent", "type", "bubbles", "cancelable", "eventPhase", "message"); 
                } 
        } 
}

package 
{ 
        import flash.display.Shape; 
        import flash.display.Sprite; 
        import flash.display.StageAlign; 
        import flash.display.StageScaleMode; 
        import flash.text.StaticText; 
        import flash.events.*; 
        import flash.text.TextField; 
        import flash.text.TextFormat; 
        import flash.display.Sprite; 
         
        // 绘制表盘 UI 
        public class ClockUI extends Sprite    
        { 
                // 表盘半径 
                public var radius:uint; 
                 
                // 表盘中心点的 X 坐标和 Y 坐标 
                public var centerX:int; 
                public var centerY:int; 
                 
                // 时, 分, 秒指针的形状 
                public var hourHand:Shape; 
                public var minuteHand:Shape; 
                public var secondHand:Shape; 
                 
                // 表盘背景颜色，以及时, 分, 秒指针颜色（0x代表16进制） 
                public var bgColor:uint = 0xEEEEFF; 
                public var hourHandColor:uint = 0x003366; 
                public var minuteHandColor:uint = 0x000099; 
                public var secondHandColor:uint = 0xCC0033; 
                 
                // 构造函数，r 为表盘半径 
                public function ClockUI(r:uint)    
                { 
                        this.radius = r; 
                                         
                        this.centerX = r; 
                        this.centerY = r; 
                } 
                 
                // 初始化表盘 
                public function init():void    
                { 
                        // 画表盘的边框 
                        drawBorder(); 
                         
                        // 画表盘上的小时的标记 
                        drawHourLabel(); 

                        // 画时, 分, 秒指针 
                        drawHand(); 
                } 
                 
                public function drawBorder():void 
                { 
                        // 指定线条样式，两个参数分别为线条的粗细（以磅为单位）和线条的颜色 
                        this.graphics.lineStyle(0.5, 0x999999); 
                        // 以指定的颜色开始填充，在调用 endFill() 后才会呈现填充 
                        this.graphics.beginFill(bgColor); 
                        // 画园，三个参数分别为圆心的 X 坐标、圆心的 Y 坐标和园的半径。之前调用的 beginFill() 方法将填充此园 
                        this.graphics.drawCircle(centerX, centerY, radius); 
                        // 呈现上次的 beginFill() 的结果 
                        this.graphics.endFill(); 
                } 
     
                public function drawHourLabel():void 
                { 
                        for (var i:Number = 1; i <= 12; i++) 
                        { 
                                // 表盘的刻度标识，1 到 12 
                                var lbl:TextField = new TextField(); 
                                lbl.text = i.toString(); 
                                 
                                // 小时刻度标识所需旋转的弧度（使用弧度是为了方便之后的 sin() 和 cos() 计算） 
                                var angle:Number = i * 30 * (Math.PI / 180); 
                                 
                                // 计算刻度标识的位置 
                                lbl.x = centerX + (0.9 * radius * Math.sin(angle)) - 5; 
                                lbl.y = centerY - (0.9 * radius * Math.cos(angle)) - 9; 
                                 
                                // 格式化刻度标识的文本样式 
                                var tf:TextFormat = new TextFormat(); 
                                // tf.font = "Arial"; 
                                tf.bold = "true"; 
                                tf.size = 12; 
                                lbl.setTextFormat(tf); 
                                 
                                // 在 Container 中添加指定的 DisplayObject ，返回值为被添加到 Container 后的 DisplayObject 
                                this.addChild(lbl); 
                        } 
                } 
                 
                public function drawHand():void 
                {                
                        hourHand = new Shape(); 
                        hourHand.graphics.lineStyle(3, hourHandColor); 
                        // 移动当前的绘画起点到指定的位置 
                        hourHand.graphics.moveTo(0, -radius * 0.5); 
                        // 画直线到指定位置，起点位置由 moveTo() 决定 
                        hourHand.graphics.lineTo(0, 0); 
                        hourHand.x = centerX; 
                        hourHand.y = centerY;                 
                        addChild(hourHand); 
                                            
                            minuteHand = new Shape(); 
                        minuteHand.graphics.lineStyle(2, minuteHandColor); 
                        minuteHand.graphics.moveTo(0, -radius * 0.8); 
                        minuteHand.graphics.lineTo(0, 0); 
                         minuteHand.x = centerX; 
                        minuteHand.y = centerY; 
                        addChild(minuteHand); 
    
                         secondHand = new Shape(); 
                        secondHand.graphics.lineStyle(0.5, secondHandColor); 
                        secondHand.graphics.moveTo(0, -radius * 0.9); 
                        secondHand.graphics.lineTo(0, 0); 
                        secondHand.x = centerX; 
                        secondHand.y = centerY; 
                        addChild(secondHand); 
                } 
                 
                // 以当前系统时间刷新表盘的呈现 
                public function refresh():void 
                { 
                        // new Date() - Flash 宿主的系统时间 
                        var currentTime:Date = new Date(); 
                         
                        var hour:uint = currentTime.getHours(); 
                        var minute:uint = currentTime.getMinutes(); 
                        var second:uint = currentTime.getSeconds(); 
         
                        // 时, 分, 秒指针做相应的旋转。单位：度数 
                        this.hourHand.rotation = hour * 30 + minute * 0.5; 
                        this.minuteHand.rotation = minute * 6; 
                        this.secondHand.rotation = second * 6; 
                } 
        } 
}

package    
{ 
        import flash.display.Sprite; 

        public class SimpleClock extends Sprite 
        { 
                import flash.events.TimerEvent; 
                import flash.utils.Timer; 
                 
                private var timer:Timer; 
                private var clockUI:ClockUI; 
                 
                // 构造函数，radius 为表盘半径 
                public function SimpleClock(radius:Number = 100):void    
                {                         
                        // 实例化一个 ClockUI 对象，并将其添加到舞台上 
                        clockUI = new ClockUI(Math.max(20, radius)); 
                        clockUI.init(); 
                        addChild(clockUI); 
                 
                        // 刷新表盘 UI 
                        clockUI.refresh(); 

                        // 实例化一个计时器，每 1 秒 tick 一次 
                        timer = new Timer(1000);                
                        timer.addEventListener(TimerEvent.TIMER, onTick); 
                        timer.start(); 
                } 

                private function onTick(e:TimerEvent):void    
                { 
                        // 刷新表盘 UI 
                        clockUI.refresh(); 
                }                 
        } 
}

package    
{ 
        public class AlarmClock extends SimpleClock    
        { 
                import flash.events.MouseEvent; 
                import flash.events.TimerEvent; 
                import flash.utils.Timer; 
                         
                private var alarmHour:Number = -1;    
                private var alarmMinute:Number = -1; 
                private var alarmMessage:String; 
                private var timer:Timer; 
                 
                // 构造函数， radius 为表盘半径 
                public function AlarmClock(radius:Number = 100):void 
                { 
                        // 调用父类的构造函数 
                        super(radius); 

                        // 计时器，每 1 秒 tick 一次 
                        timer = new Timer(1000); 
                        timer.addEventListener(TimerEvent.TIMER, onTick); 
                        timer.start(); 
                } 

                /* 
                 * 设置提醒时间 
                 * @param hour                提醒时间的小时数 
                 * @param minute        提醒时间的分钟数 
                 * @param message        提醒信息 
                 * @return 无返回值 
                 */ 
                public function setAlarm(hour:Number = 0, minute:Number = 0, message:String = "Alarm!"):void 
                {                     
                        alarmHour = hour; 
                        alarmMinute = minute; 
                         alarmMessage = message; 
                } 
                 
                /* 
                 * 清除提醒时间 
                 */ 
                public function clearAlarm() 
                { 
                        alarmHour = alarmMinute = -1; 
                } 

                private function onTick(e:TimerEvent):void    
                { 
                        var date:Date = new Date(); 
                         
                        if (alarmHour == date.hours && alarmMinute == date.minutes) 
                        { 
                                // 如果到了提醒时间则实例化 AlarmEvent，并通过 dispatchEvent() 触发该事件 
                                var alarm:AlarmEvent = new AlarmEvent(alarmMessage); 
                                dispatchEvent(alarm); 
                        } 
                } 
        } 
}

package 
{ 
        import flash.display.MovieClip; 
        import flash.events.MouseEvent; 
         
        public class Clock extends MovieClip    
        { 
                var alarmClock:AlarmClock; 
                 
                public function Clock():void 
                { 
                        btnSet.addEventListener(MouseEvent.CLICK, onSetAlarm); 
                        btnClear.addEventListener(MouseEvent.CLICK, onClearAlarm); 
                        txtHour.maximum = 23; 
                        txtMinute.maximum = 59; 
                        txtHour.value = new Date().hours; 
                        txtMinute.value = new Date().minutes; 

                        // 实例化 AlarmClock，并在舞台上添加此对象 
                        alarmClock = new AlarmClock(80); 
                        alarmClock.x = 200; 
                        alarmClock.y = 200; 
                        alarmClock.addEventListener(AlarmEvent.ALARM, onAlarm); 
                        addChild(alarmClock); 
                } 
                 
                function onSetAlarm(e:MouseEvent):void 
                { 
                        alarmClock.setAlarm(txtHour.value, txtMinute.value, "起床啦"); 
                } 
                 
                function onClearAlarm(e:MouseEvent):void 
                { 
                        alarmClock.clearAlarm(); 
                        txtMessage.text = ""; 
                } 
                 
                function onAlarm(e:AlarmEvent):void 
                { 
                        txtMessage.text += e.alermMessage + " " + new Date().toString() + "\n"; 
                        txtMessage.verticalScrollPosition = txtMessage.maxVerticalScrollPosition;         
                } 
        } 
}