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370
com/yahoo/astra/display/BitmapText.as
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370
com/yahoo/astra/display/BitmapText.as
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/*
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Copyright (c) 2009 Yahoo! Inc. All rights reserved.
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The copyrights embodied in the content of this file are licensed under the BSD (revised) open source license
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*/
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package com.yahoo.astra.display
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{
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import flash.display.Sprite;
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import flash.text.*;
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import flash.display.Bitmap;
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import flash.display.BitmapData;
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import flash.display.PixelSnapping;
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import flash.geom.Matrix;
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/**
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* BitmapText is a class that can be used to create rotating text fields with
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* device fonts. When the rotation property is set to a value other than 0
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* and the <code>embedFonts</code> is false, the text field will be replaced
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* by a Sprite containing a bitmap.
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*
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* @author Tripp Bridges
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*/
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public class BitmapText extends Sprite
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{
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/**
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* Constructor
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*/
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public function BitmapText()
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{
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super();
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this.addChild(_bitmapContainer);
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this.addChild(this.textField);
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}
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/**
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* @private
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* Used to hold the bitmap object
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*/
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private var _bitmap:Bitmap = null;
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/**
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* @private
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* Sprite that holds the bitmap container
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*/
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private var _bitmapContainer:Sprite = new Sprite();
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/**
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* @private
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* Placeholder for the width value. Equals the width of a bitmap when the bitmap
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* displays text and the text field when it displays text. Since the text field and
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* bitmap sprite are always present, the returned dimensions would always be innacurate.
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*/
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private var _width:Number = 0;
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/**
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* @private
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* Placeholder for the height value. Equals the height of a bitmap when the bitmap
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* displays text and the text field when it displays text. Since the text field and
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* bitmap sprite are always present, the returned dimensions would always be innacurate.
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*/
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private var _height:Number = 0;
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/**
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* @private
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* Placeholder for the text field
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*/
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private var _textField:TextField = new TextField();
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/**
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* Specifies the format applied to newly inserted text, such as text inserted with the
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* <code>replaceSelectedText()</code> method or text entered by a user.
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*/
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public function get defaultTextFormat():TextFormat
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{
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return this.textField.defaultTextFormat;
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}
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/**
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* @private (setter)
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*/
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public function set defaultTextFormat(value:TextFormat):void
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{
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this.textField.defaultTextFormat = value;
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}
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/**
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* Specifies whether to render by using embedded font outlines.
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*/
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public function get embedFonts():Boolean
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{
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return this.textField.embedFonts;
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}
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/**
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* @private (setter)
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*/
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public function set embedFonts(value:Boolean):void
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{
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this.textField.embedFonts = value;
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}
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/**
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* @private
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* Placeholder for the rotation property of the text field
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*/
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private var _rotation:Number = 0;
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/**
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* @inheritDoc
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*/
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override public function get rotation():Number
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{
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return _rotation;
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}
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/**
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* @private (setter)
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*/
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override public function set rotation(value:Number):void
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{
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_rotation = value;
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setTextRotation(value);
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}
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/**
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* A string that is the current text in the text field.
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*/
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public function get text():String
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{
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return this.textField.text;
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}
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/**
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* @private (setter)
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*/
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public function set text(value:String):void
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{
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this.textField.text = value;
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this.textField.visible = true;
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this.contentWidth = _width = this.textField.width;
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this.contentHeight = _height = this.textField.height;
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}
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/**
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* A Boolean value that indicates whether the text field is selectable.
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*/
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public function get selectable():Boolean
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{
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return this.textField.selectable;
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}
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/**
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* @private (setter)
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*/
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public function set selectable(value:Boolean):void
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{
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this.textField.selectable = value;
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}
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/**
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* Controls automatic sizing and alignment of text fields.
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*/
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public function get autoSize():String
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{
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return this.textField.autoSize;
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}
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/**
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* @private (setter)
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*/
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public function set autoSize(value:String):void
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{
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this.textField.autoSize = value;
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}
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/**
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* Reference to the text field
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*/
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public function get textField():TextField
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{
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return _textField;
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}
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/**
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* @private (setter)
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*/
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public function set textField(value:TextField):void
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{
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_textField = value;
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}
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/**
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* @private (setter)
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*/
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public function set border(value:Boolean):void
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{
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this.textField.border = value;
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}
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/**
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* Gets the minimum distance for placement of labels of the same rotation
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*/
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public function get rotationWidth():Number
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{
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var adjustedWidth:Number = 0;
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if(this.rotation == 0 || Math.abs(this.rotation) == 90)
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{
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adjustedWidth = this.width;
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}
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else if(this.rotation > 0)
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{
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if(this.rotation < 15)
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{
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adjustedWidth = this.width - (Math.sin(Math.abs(this.rotation)*Math.PI/180)*this.textField.textHeight*2);
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}
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else if(this.rotation > 40 && this.rotation < 50)
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{
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adjustedWidth = this.contentHeight / (Math.cos((90-Math.abs(this.rotation))*Math.PI/180));
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adjustedWidth = Math.min(adjustedWidth, this.width);
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}
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else
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{
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adjustedWidth = this.contentHeight / (Math.cos((90-Math.abs(this.rotation))*Math.PI/180));
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adjustedWidth = Math.min(adjustedWidth, this.width);
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}
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}
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else
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{
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if(this.rotation > -15)
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{
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adjustedWidth = this.width - (Math.sin(Math.abs(this.rotation)*Math.PI/180)*this.textField.textHeight*2);
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}
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else if(this.rotation < -40 && this.rotation > -50)
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{
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adjustedWidth = this.contentHeight / (Math.cos((90-Math.abs(this.rotation))*Math.PI/180));
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adjustedWidth = Math.min(adjustedWidth, this.width);
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}
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else
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{
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adjustedWidth = this.contentHeight / (Math.cos((90-Math.abs(this.rotation))*Math.PI/180));
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adjustedWidth = Math.min(adjustedWidth, this.width);
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}
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}
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return adjustedWidth;
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}
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public function get rotationHeight():Number
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{
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var adjustedHeight:Number;
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if(this.rotation == 0 || Math.abs(this.rotation) == 90)
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{
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adjustedHeight = this.height;
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}
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else
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{
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if(Math.abs(this.rotation) > 70)
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{
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adjustedHeight = this.height;
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}
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else
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{
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adjustedHeight = this.contentHeight / (Math.sin((90 - Math.abs(this.rotation))*Math.PI/180));
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}
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}
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return adjustedHeight;
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}
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/**
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* @private
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* Placeholder for contentWidth
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*/
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private var _contentWidth:Number = 0;
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/**
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* Width of the text field without rotation.
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*/
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public function get contentWidth():Number
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{
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return _contentWidth;
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}
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/**
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* @private (setter)
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*/
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public function set contentWidth(value:Number):void
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{
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_contentWidth = value;
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}
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/**
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* @private
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* Placeholder for contentHeight
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*/
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private var _contentHeight:Number = 0;
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/**
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* Height of the text field without rotation.
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*/
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public function get contentHeight():Number
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{
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return _contentHeight;
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}
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/**
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* @private (setter)
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*/
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public function set contentHeight(value:Number):void
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{
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_contentHeight = value;
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}
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public function get textWidth():Number
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{
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return this.textField.textWidth;
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}
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public function get textHeight():Number
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{
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return this.textField.textHeight;
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}
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/**
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* @private
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*
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* Sets the rotation of the text. When the value is 0 or <code>embedFonts</code>
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* is set to true, rotate the text field. Otherwise, draw the text field into a bitmap
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* and rotate its container sprite.
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*/
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private function setTextRotation(value:Number):void
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{
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if(this.text == null || this.text == "") return;
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if(value == 0 || this.embedFonts)
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{
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this.contentWidth = this.textField.width;
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this.contentHeight = this.textField.height;
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this.textField.visible = true;
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this.textField.x = 0;
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this.textField.y = 0;
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_bitmapContainer.visible = false;
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}
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else
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{
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var smoothing:Boolean = Math.abs(value)%90 != 0;
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var matrix:Matrix = new Matrix();
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//Have to move text over if it is right-aligned. Need to add an extra 5 pixels to the x value. We will also add 5 pixels to
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//the width argument of the bitmap data. Depending on the letters, the left-most letters get cut-off. The additional 5 pixels
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//prevents this from happening.
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if(this.autoSize == TextFieldAutoSize.RIGHT) matrix.translate(-Math.ceil(this.textField.x)+5, -Math.ceil(this.textField.y));
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var wid:Number = this.autoSize == TextFieldAutoSize.RIGHT ? (this.textField.width) + 5 : this.textField.width;
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var bitmapDataText:BitmapData = new BitmapData(Math.ceil(wid), Math.ceil(this.textField.height), true, 0x000000);
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bitmapDataText.draw(textField, matrix, null, null, null, smoothing);
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_bitmap = new Bitmap(bitmapDataText);
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_bitmap.smoothing = smoothing;
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if(_bitmapContainer.numChildren > 0) _bitmapContainer.removeChildAt(0);
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this.textField.visible = false;
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_bitmapContainer.addChild(_bitmap);
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this.contentWidth = _bitmapContainer.width;
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this.contentHeight = _bitmapContainer.height;
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_bitmapContainer.visible = true;
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}
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super.rotation = value;
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}
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}
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}
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