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ScaleBitmap

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ScaleBitmap.as
ActionScript
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/**
* ScaleBitmap
*
* @version 1.1
* @author Didier BRUN - http://www.bytearray.org
*
* @version 1.2.1
* @author Alexandre LEGOUT - http://blog.lalex.com
*
* @version 1.2.2
* @author Pleh
*
* @version 1.2.3
* @author Vaclav Vancura - http://vaclav.vancura.org
*
* @version 1.2.4
* @author Joel Stransky - http://stranskydesign.com
*
* @version 1.3
* @author Vaclav Vancura - http://vaclav.vancura.org
*
* Project page : http://www.bytearray.org/?p=118
*/
 
package org.bytearray.display {
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.geom.Matrix;
import flash.geom.Rectangle;
 
public class ScaleBitmap extends Bitmap {
 
protected var _originalBitmap:BitmapData;
protected var _scale9Grid:Rectangle = null;
protected var _originalWidth:Number;
protected var _originalHeight:Number;
protected var _scaleX:Number = 1;
protected var _scaleY:Number = 1;
 
/**
* Constructor.
* @param bmpData Source BitmapData
* @param pixelSnapping Pixel snapping (default 'auto')
* @param smoothing Smoothing
*/
function ScaleBitmap(bmpData:BitmapData = null, pixelSnapping:String = "auto", smoothing:Boolean = false) {
super(bmpData, pixelSnapping, smoothing);
if(bmpData != null) {
_originalBitmap = bmpData.clone();
_originalWidth = bmpData.width;
_originalHeight = bmpData.height;
}
}
 
/**
* Set ScaleBitmap position.
* @param w Width
* @param h Height
*/
public function setSize(w:Number, h:Number):void {
if(_scale9Grid == null) {
super.width = w;
super.height = h;
}
else {
w = Math.max(w, _originalBitmap.width - _scale9Grid.width);
h = Math.max(h, _originalBitmap.height - _scale9Grid.height);
resizeBitmap(w, h);
}
}
 
/**
* Get original BitmapData.
* @return Original BitmapData
*/
public function getOriginalBitmapData():BitmapData {
return _originalBitmap;
}
 
/**
* Set bitmapData.
* @param bmpData BitmapData
*/
override public function set bitmapData(bmpData:BitmapData):void {
_originalBitmap = bmpData.clone();
if(_scale9Grid != null) {
if(!validGrid(_scale9Grid)) {
_scale9Grid = null;
}
setSize(bmpData.width, bmpData.height);
}
else {
assignBitmapData(_originalBitmap.clone());
}
}
 
/**
* Set width.
* @param w Width
*/
override public function set width(w:Number):void {
if(w != width) {
setSize(w, height);
}
}
 
/**
* Set height.
* @param h Height
*/
override public function set height(h:Number):void {
if(h != height) {
setSize(width, h);
}
}
 
/**
* Get scale9Grid.
* @return Scale9 grid Rectangle
*/
override public function get scale9Grid():Rectangle {
return _scale9Grid;
}
 
/**
* Set scale9 grid.
* @param r Scale9 grid Rectangle
*/
override public function set scale9Grid(r:Rectangle):void {
// Check if the given grid is different from the current one
if((_scale9Grid == null && r != null) || (_scale9Grid != null && !_scale9Grid.equals(r))) {
if(r == null) {
// If deleting scalee9Grid, restore the original bitmap
// then resize it (streched) to the previously set dimensions
var currentWidth:Number = width;
var currentHeight:Number = height;
_scale9Grid = null;
assignBitmapData(_originalBitmap.clone());
setSize(currentWidth, currentHeight);
}
else {
if(!validGrid(r)) {
throw (new Error("#001 - The _scale9Grid does not match the original BitmapData"));
return;
}
_scale9Grid = r.clone();
resizeBitmap(width, height);
scaleX = 1;
scaleY = 1;
}
}
}
 
/**
* Get scaleX value.
* @return scaleX
*/
override public function get scaleX():Number {
return _scaleX;
}
 
/**
* Set scaleX value.
* @param value scaleX value
*/
override public function set scaleX(value:Number):void {
if(value != _scaleX) {
_scaleX = value;
setSize(_originalWidth * value, height);
}
}
 
/**
* Get scaleY value.
* @return scaleY
*/
override public function get scaleY():Number {
return _scaleY;
}
 
/**
* Set scaleY value.
* @param value scaleY value
*/
override public function set scaleY(value:Number):void {
if(value != scaleY) {
_scaleY = value;
setSize(width, _originalHeight * value);
}
}
 
/**
* Resize bitmap.
* @param w Width
* @param h Height
*/
protected function resizeBitmap(w:Number, h:Number):void {
var bmpData:BitmapData = new BitmapData(w, h, true, 0x00000000);
var rows:Array = [0, _scale9Grid.top, _scale9Grid.bottom, _originalBitmap.height];
var cols:Array = [0, _scale9Grid.left, _scale9Grid.right, _originalBitmap.width];
var dRows:Array = [0, _scale9Grid.top, h - (_originalBitmap.height - _scale9Grid.bottom), h];
var dCols:Array = [0, _scale9Grid.left, w - (_originalBitmap.width - _scale9Grid.right), w];
 
var origin:Rectangle;
var draw:Rectangle;
var mat:Matrix = new Matrix();
 
for(var cx:int = 0; cx < 3;cx++) {
for(var cy:int = 0; cy < 3;cy++) {
origin = new Rectangle(cols[cx], rows[cy], cols[cx + 1] - cols[cx], rows[cy + 1] - rows[cy]);
draw = new Rectangle(dCols[cx], dRows[cy], dCols[cx + 1] - dCols[cx], dRows[cy + 1] - dRows[cy]);
mat.identity();
mat.a = draw.width / origin.width;
mat.d = draw.height / origin.height;
mat.tx = draw.x - origin.x * mat.a;
mat.ty = draw.y - origin.y * mat.d;
bmpData.draw(_originalBitmap, mat, null, null, draw, smoothing);
}
}
assignBitmapData(bmpData);
}
private function assignBitmapData(bmp:BitmapData):void {
if(super.bitmapData != null) {
super.bitmapData.dispose();
}
super.bitmapData = bmp;
}
 
private function validGrid(r:Rectangle):Boolean {
return r.right <= _originalBitmap.width && r.bottom <= _originalBitmap.height;
}
}
}

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