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PositionUtils.as
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package {
import flash.geom.Point;
import flash.display.Stage;
public class PositionUtils {
public function PositionUtils() {
// constructor code
}
public static function makePosArr(stage:Stage,square:int,spacing:int):Vector.<PhotoPosition>{ //生成空数组位置
var boundsX:int=int(stage.stageWidth);
var boundsY:int=int(stage.stageHeight-45);
var ipo:IPosition=new IPosition();
ipo.horNum=Math.floor(boundsX/(square+5));
ipo.verNum=Math.floor(boundsY/(square+5));
ipo.length=ipo.horNum*ipo.verNum;
ipo.square=square;
ipo.spacing=spacing;
ipo.startX=((stage.stageWidth-(square+5)*ipo.horNum)+5)/2;
ipo.startY=((stage.stageHeight-(square+5)*ipo.verNum)+5-45)/2;
var arr=new Array();
for(var ii:int=0;ii<ipo.horNum;ii++){
if(!arr[ii]) arr[ii]=new Array();
for(var jj:int=0;jj<ipo.verNum;jj++){
arr[ii][jj]=-1;
}
}
ipo.posArray=arr;
return PositionUtils.makePosVector(ipo);
}
public static function randomOutside(stage:Stage):Point{
var desX:Number,desY:Number;
var iid=Math.random();
if(iid<0.2){
desX=stage.stageWidth+150;
desY=Math.random()*stage.stageHeight;
}else if(iid<0.5){
desX=-150;
desY=Math.random()*stage.stageHeight;
}else if(iid<0.7){
desY=stage.stageHeight+150;
desX=Math.random()*stage.stageWidth;
}else{
desY=-150;
desX=Math.random()*stage.stageWidth;
}
return new Point(desX,desY);
}
public static function randomInside(stage:Stage):Point{
var desX:Number,desY:Number;
desY=Math.random()*stage.stageHeight;
desX=Math.random()*stage.stageWidth;
return new Point(desX,desY);
}
//========================================
//return one page abstract position vector
//========================================
private static function makePosVector(ipo:IPosition):Vector.<PhotoPosition>{
var fotoPos:Vector.<PhotoPosition> = new Vector.<PhotoPosition>();
for(var j:int=0;j<ipo.length;j++){
var cc:Number=Math.random();
var type:int;
if(cc<0.1){
type=2;
}else if(cc<0.2){
type=4;
}else if(cc<0.3){
type=3;
}else{
type=1;
}
var pos:Point=getNextPos(type,ipo.posArray,ipo.verNum,ipo.horNum);
//trace(pos.x)
if(pos.x==-1){ //分配不下位置时分配1
pos=getNextPos(1,ipo.posArray,ipo.verNum,ipo.horNum);
type=1;
}
if(pos.x==-2){//已经摆满
break;
}
var pp:PhotoPosition=new PhotoPosition();
pp.x=pos.x*(ipo.square+ipo.spacing)+ipo.startX;
pp.y=pos.y*(ipo.square+ipo.spacing)+ipo.startY;
pp.type=type;
fotoPos.push(pp);
}
return fotoPos;
}
//===================================================
//返回下一个图片位置，当为-1时是排不下，当999时是已经排满
//===================================================
private static function getNextPos(type:int,arr:Array,verNum:int,horNum:int):Point{
var posX:Number,posY:Number;
outterLoop:for(var jj:int=0;jj<verNum;jj++){
for(var ii:int=0;ii<horNum;ii++){
if(arr[ii][jj]==-1){
posX=ii; //(ii)*(square+5)+startX;
posY=jj; //(jj)*(square+5)+startY;
if(type==1){
arr[ii][jj]=1;
return new Point(posX,posY);
}else if(type==2){
if(!arr[ii+1]||!arr[ii+1][jj+1]){//已经排满;
return new Point(-1,-1);
}
if(arr[ii+1][jj]==-1&&arr[ii+1][jj+1]==-1&&arr[ii][jj+1]==-1){
arr[ii][jj]=1;
arr[ii][jj+1]=1;
arr[ii+1][jj]=1;
arr[ii+1][jj+1]=1;
return new Point(posX,posY);
}else{
continue;
}
}else if(type==3){
if(!arr[ii+1]||!arr[ii+1][jj]){
//trace("grid are full#3");
return new Point(-1,-1);
}
if(arr[ii+1][jj]==-1){
arr[ii][jj]=1;
arr[ii+1][jj]=1;
return new Point(posX,posY);
}else{
continue;
}
}else if(type==4){
if(!arr[ii]||!arr[ii][jj+1]){
return new Point(-1,-1);
}
if(arr[ii][jj+1]==-1){
arr[ii][jj]=1;
arr[ii][jj+1]=1;
return new Point(posX,posY);
}else{
continue;
}
}
}//end of if
}
}
return new Point(-2,-2);
}
}
}