topical media & game development
actionscript-book-AlarmClock-com-example-programmingas3-clock-AnalogClockFace.ax
actionscript-book-AlarmClock-com-example-programmingas3-clock-AnalogClockFace.ax
[swf]
flex
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 mx.core.UIComponent;
Displays a round clock face with an hour hand, a minute hand, and a second hand.
public class @ax-actionscript-book-AlarmClock-com-example-programmingas3-clock-AnalogClockFace extends UIComponent
{
The desired width of this component, as opposed to the .width
property which represents tha actual width.
public var w:uint = 200;
The desired height of this component, as opposed to the .height
property which represents tha actual height.
public var h:uint = 200;
The radius from the center of the clock to the
outer edge of the circular face outline.
public var radius:uint;
The coordinates of the center of the face.
public var centerX:int;
public var centerY:int;
The three hands of the clock.
public var hourHand:Shape;
public var minuteHand:Shape;
public var secondHand:Shape;
The colors of the background and each hand.
These could be set using parameters or
styles in the future.
public var bgColor:uint = 0xEEEEFF;
public var hourHandColor:uint = 0x003366;
public var minuteHandColor:uint = 0x000099;
public var secondHandColor:uint = 0xCC0033;
Stores a snapshot of the current time, so it
doesn't change while in the middle of drawing the
three hands.
public var currentTime:Date;
Contructs a new clock face. The width and
height will be equal.
public function @ax-actionscript-book-AlarmClock-com-example-programmingas3-clock-AnalogClockFace(w:uint)
{
this.w = w;
this.h = w;
// Rounds to the nearest pixel
this.radius = Math.round(this.w / 2);
// The face is always square now, so the
// distance to the center is the same
// horizontally and vertically
this.centerX = this.radius;
this.centerY = this.radius;
}
Creates the outline, hour labels, and clock hands.
public function init():void
{
// draws the circular clock outline
drawBorder();
// draws the hour numbers
drawLabels();
// creates the three clock hands
createHands();
}
Draws a circular border.
public function drawBorder():void
{
graphics.lineStyle(0.5, 0x999999);
graphics.beginFill(bgColor);
graphics.drawCircle(centerX, centerY, radius);
graphics.endFill();
}
Puts numeric labels at the hour points.
public function drawLabels():void
{
for (var i:Number = 1; i <= 12; i++)
{
// Creates a new TextField showing the hour number
var label:TextField = new TextField();
label.text = i.toString();
// Places hour labels around the clock face.
// The sin() and cos() functions both operate on angles in radians.
var angleInRadians:Number = i * 30 * (Math.PI/180)
// Place the label using the sin() and cos() functions to get the x,y coordinates.
// The multiplier value of 0.9 puts the labels inside the outline of the clock face.
// The integer value at the end of the equation adjusts the label position,
// since the x,y coordinate is in the upper left corner.
label.x = centerX + (0.9 * radius * Math.sin( angleInRadians )) - 5;
label.y = centerY - (0.9 * radius * Math.cos( angleInRadians )) - 9;
// Formats the label text.
var tf:TextFormat = new TextFormat();
tf.font = "Arial";
tf.bold = "true";
tf.size = 12;
label.setTextFormat(tf);
// Adds the label to the clock face display list.
addChild(label);
}
}
Creates hour, minute, and second hands using the 2D drawing API.
public function createHands():void
{
// Uses a Shape since it's the simplest component that supports
// the 2D drawing API.
var hourHandShape:Shape = new Shape();
drawHand(hourHandShape, Math.round(radius * 0.5), hourHandColor, 3.0);
this.hourHand = Shape(addChild(hourHandShape));
this.hourHand.x = centerX;
this.hourHand.y = centerY;
var minuteHandShape:Shape = new Shape();
drawHand(minuteHandShape, Math.round(radius * 0.8), minuteHandColor, 2.0);
this.minuteHand = Shape(addChild(minuteHandShape));
this.minuteHand.x = centerX;
this.minuteHand.y = centerY;
var secondHandShape:Shape = new Shape();
drawHand(secondHandShape, Math.round(radius * 0.9), secondHandColor, 0.5);
this.secondHand = Shape(addChild(secondHandShape));
this.secondHand.x = centerX;
this.secondHand.y = centerY;
}
Draws a clock hand with a given size, color, and thickness.
public function drawHand(hand:Shape, distance:uint, color:uint, thickness:Number):void
{
hand.graphics.lineStyle(thickness, color);
hand.graphics.moveTo(0, distance);
hand.graphics.lineTo(0, 0);
}
Called by the parent container when the display is being drawn.
public function draw():void
{
// Stores the current date and time in an instance variable
currentTime = new Date();
showTime(currentTime);
}
Displays the given Date/Time in that good old analog clock style.
public function showTime(time:Date):void
{
// Gets the time values
var seconds:uint = time.getSeconds();
var minutes:uint = time.getMinutes();
var hours:uint = time.getHours();
// Multiplies by 6 to get degrees
this.secondHand.rotation = 180 + (seconds * 6);
this.minuteHand.rotation = 180 + (minutes * 6);
// Multiplies by 30 to get basic degrees, and then
// adds up to 29.5 degrees (59 * 0.5) to account
// for the minutes
this.hourHand.rotation = 180 + (hours * 30) + (minutes * 0.5);
}
}
}
(C) Æliens
27/08/2009
You may not copy or print any of this material without explicit permission of the author or the publisher.
In case of other copyright issues, contact the author.
