Create a gist now

Instantly share code, notes, and snippets.

What would you like to do?
as3potrace demo
package
{
import com.bit101.components.CheckBox;
import com.bit101.components.ComboBox;
import com.bit101.components.PushButton;
import com.powerflasher.as3potrace.POTrace;
import com.powerflasher.as3potrace.backend.GraphicsDataBackend;
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.display.CapsStyle;
import flash.display.GraphicsEndFill;
import flash.display.GraphicsSolidFill;
import flash.display.GraphicsStroke;
import flash.display.IGraphicsData;
import flash.display.JointStyle;
import flash.display.LineScaleMode;
import flash.display.Loader;
import flash.display.LoaderInfo;
import flash.display.PixelSnapping;
import flash.display.Sprite;
import flash.display.StageAlign;
import flash.display.StageScaleMode;
import flash.events.Event;
import flash.events.MouseEvent;
import flash.filters.BitmapFilter;
import flash.filters.BitmapFilterQuality;
import flash.filters.BlurFilter;
import flash.filters.ColorMatrixFilter;
import flash.geom.Matrix;
import flash.geom.Point;
import flash.net.FileFilter;
import flash.net.FileReference;
import flash.utils.ByteArray;
[SWF(backgroundColor="#FFFFFF", frameRate="31", width="475", height="475")]
public class Main extends Sprite
{
[Embed(source="../bitmaps/Powerflasher.png")]
public var Powerflasher:Class;
[Embed(source="../bitmaps/TheFlash.jpg")]
public var TheFlash:Class;
[Embed(source="../bitmaps/Bulldog.jpg")]
public var Bulldog:Class;
[Embed(source="../bitmaps/Baby.jpg")]
public var Baby:Class;
private var canvas:Sprite;
private var imageContainer:Sprite;
private var comboBoxImage:ComboBox;
private var comboBoxZoom:ComboBox;
private var dragStartX:Number;
private var dragStartY:Number;
private var imageX:Number;
private var imageY:Number;
private var showBitmap:Boolean = true;
public function Main()
{
stage.align = StageAlign.TOP_LEFT;
stage.scaleMode = StageScaleMode.NO_SCALE;
imageContainer = new Sprite();
var canvasMask:Sprite = new Sprite();
canvasMask.graphics.beginFill(0xffffff, 0);
canvasMask.graphics.drawRect(-1, -1, stage.stageWidth - 18, stage.stageHeight - 58);
canvasMask.graphics.endFill();
canvas = new Sprite();
canvas.x = 10;
canvas.y = 40;
canvas.addChild(imageContainer);
canvas.addChild(canvasMask);
canvas.mask = canvasMask;
addChild(canvas);
var canvasHitArea:Sprite = new Sprite();
canvasHitArea.graphics.beginFill(0xffffff, 0);
canvasHitArea.graphics.drawRect(0, 0, stage.stageWidth - 20, stage.stageHeight - 60);
canvasHitArea.graphics.endFill();
canvasHitArea.x = 10;
canvasHitArea.y = 40;
canvasHitArea.buttonMode = true;
canvasHitArea.addEventListener(MouseEvent.MOUSE_DOWN, canvasMouseDownHandler);
addChild(canvasHitArea);
comboBoxImage = new ComboBox(this, 10, 10, "Select image", [
"Powerflasher",
"TheFlash",
"Bulldog",
"Baby"
]);
comboBoxImage.addEventListener(Event.SELECT, function(event:Event):void {
var ImageClass:Class;
switch(String(comboBoxImage.selectedItem)) {
case "Powerflasher": ImageClass = Powerflasher; break;
case "TheFlash": ImageClass = TheFlash; break;
case "Bulldog": ImageClass = Bulldog; break;
case "Baby": ImageClass = Baby; break;
}
if(ImageClass != null) {
prepareImage(new ImageClass() as Bitmap);
}
});
comboBoxImage.numVisibleItems = 4;
comboBoxImage.selectedIndex = 0;
var checkBox:CheckBox = new CheckBox(this, 230, 15, "Hide bitmap", function():void {
showBitmap = checkBox.selected;
if(imageContainer.numChildren > 0) {
imageContainer.getChildAt(0).visible = showBitmap;
}
});
checkBox.selected = true;
comboBoxZoom = new ComboBox(this, stage.stageWidth - 110, 10, "Zoom", ["100%", "200%", "300%", "400%"]);
comboBoxZoom.addEventListener(Event.SELECT, function(event:Event):void {
imageContainer.scaleX = imageContainer.scaleY = comboBoxZoom.selectedIndex + 1;
});
comboBoxZoom.numVisibleItems = 4;
comboBoxZoom.selectedIndex = 2;
addChild(new PushButton(this, 120, 10, "Upload Image", function():void {
var ref:FileReference = new FileReference();
ref.addEventListener(Event.SELECT, function(e:Event):void { ref.load(); });
ref.addEventListener(Event.COMPLETE, function(e:Event):void { loadBytes(ref.data); });
ref.browse([new FileFilter("PNG (*.png)", "*.png"), new FileFilter("JPG (*.jpg)", "*.jpg"), new FileFilter("GIF (*.gif)", "*.gif")]);
}));
}
private function canvasMouseDownHandler(event:MouseEvent):void
{
dragStartX = event.stageX;
dragStartY = event.stageY;
imageX = imageContainer.x;
imageY = imageContainer.y;
stage.addEventListener(MouseEvent.MOUSE_UP, canvasMouseUpHandler);
stage.addEventListener(MouseEvent.MOUSE_MOVE, mouseMoveHandler);
}
private function mouseMoveHandler(event:MouseEvent):void
{
imageContainer.x = imageX + event.stageX - dragStartX;
imageContainer.y = imageY + event.stageY - dragStartY;
}
private function canvasMouseUpHandler(event:MouseEvent):void
{
stage.removeEventListener(MouseEvent.MOUSE_UP, canvasMouseUpHandler);
stage.removeEventListener(MouseEvent.MOUSE_MOVE, mouseMoveHandler);
}
protected function loadBytes(image:ByteArray):void
{
comboBoxImage.selectedIndex = -1;
var loader:Loader = new Loader();
loader.contentLoaderInfo.addEventListener(Event.INIT, initHandler);
loader.loadBytes(image);
}
protected function initHandler(event:Event):void
{
var loaderInfo:LoaderInfo = event.target as LoaderInfo;
var loader:Loader = loaderInfo.loader;
prepareImage(loader.content as Bitmap);
}
protected function prepareImage(bitmap:Bitmap):void
{
imageContainer.x = imageContainer.y = 0;
if(comboBoxZoom != null) {
comboBoxZoom.selectedIndex = 0;
}
var xs:Number = (stage.stageWidth - 20) / bitmap.width;
var ys:Number = (stage.stageHeight - 60) / bitmap.height;
var s:Number = Math.min(xs, ys, 1);
var bmd:BitmapData = new BitmapData(bitmap.width * s, bitmap.height * s, false);
var matrix:Matrix = new Matrix();
matrix.createBox(s, s);
bmd.draw(bitmap, matrix, null, null, null, true);
bmd.applyFilter(bmd, bmd.rect, new Point(0, 0), grayscaleFilter);
bmd.applyFilter(bmd, bmd.rect, new Point(0, 0), blurFilter);
var bm:Bitmap = new Bitmap(bmd, PixelSnapping.AUTO, true);
traceImage(bm);
}
protected function traceImage(bitmap:Bitmap):void
{
while(imageContainer.numChildren > 0) {
imageContainer.removeChildAt(0);
}
var bm:Bitmap = bitmap;
bm.visible = showBitmap;
imageContainer.addChild(bm);
var curves:Sprite = new Sprite();
imageContainer.addChild(curves);
var gd:Vector.<IGraphicsData> = new Vector.<IGraphicsData>();
var strokeFill:GraphicsSolidFill = new GraphicsSolidFill(0x008800, 1);
gd.push(new GraphicsStroke(1, false, LineScaleMode.NONE, CapsStyle.ROUND, JointStyle.ROUND, 3, strokeFill));
gd.push(new GraphicsSolidFill(0x00ff00, 0.75));
var potrace:POTrace = new POTrace();
potrace.backend = new GraphicsDataBackend(gd);
potrace.potrace_trace(bitmap.bitmapData);
gd.push(new GraphicsEndFill());
curves.graphics.drawGraphicsData(gd);
}
protected function get grayscaleFilter():BitmapFilter
{
var r:Number = 0.212671;
var g:Number = 0.715160;
var b:Number = 0.072169;
return new ColorMatrixFilter([
r, g, b, 0, 0,
r, g, b, 0, 0,
r, g, b, 0, 0,
0, 0, 0, 1, 0
]);
}
protected function get blurFilter():BitmapFilter
{
return new BlurFilter(2, 2, BitmapFilterQuality.HIGH);
}
}
}

smanor commented Nov 10, 2011

import com.bit101.components.CheckBox;
import com.bit101.components.ComboBox;
import com.bit101.components.PushButton;

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment