// NewsTicker Object
// an animated news ticker
// 19990623

// Copyright (C) 1999 Dan Steinman
// Distributed under the terms of the GNU Library General Public License
// Available at http://www.dansteinman.com/dynapi/

function NewsTicker(x,y,width,height) {
 this.name = 'NewsTicker'+(NewsTicker.count++)
 this.x = x
 this.y = y
 this.w = width
 this.h = height
 this.obj = this.name + "Object"
 eval(this.obj + "=this")
 this.items = new Array()
 this.scrollCount = 0

 this.pauseLength = 5000
 this.inc = 2
 this.speed = 50
 this.fromX = 0
 this.fromY = this.h
 this.bgColor = null

 this.addItem = NewsTickerAddItem
 this.activate = NewsTickerActivate
 this.build = NewsTickerBuild
 this.start = NewsTickerStart
 this.stop = NewsTickerStop
 this.slide = NewsTickerSlide
}
function NewsTickerAddItem(text) {
 var i = this.items.length
 this.items[i] = new Object()
 this.items[i].text = text
}
function NewsTickerBuild() {
 this.css = css(this.name,this.x,this.y,this.w,this.h)
 this.div = '<div id="'+this.name+'">'
 for (var i=0;i<this.items.length;i++) {
  this.css += css(this.name+'Item'+i,0,0,this.w,this.h,this.bgColor,'hidden')
  this.div += '<div id="'+this.name+'Item'+i+'">'+this.items[i].text+'</div>'
 }
 this.div += '</div>'
}
function NewsTickerActivate(autostart) {
 for (var i=0;i<this.items.length;i++) {
  this.items[i].lyr = new DynLayer(this.name+'Item'+i)
  this.items[i].lyr.moveTo(this.fromX,this.fromY)
  this.items[i].lyr.show()
 }
 this.items[0].lyr.moveTo(0,0)
 this.lyr = new DynLayer(this.name)
 var num = Math.sqrt(Math.pow(this.fromX,2) + Math.pow(this.fromY,2))/this.inc
 this.dx = this.fromX/num || 0
 this.dy = this.fromY/num || 0
 if (autostart!=false) setTimeout(this.obj+'.start()',this.pauseLength)
}
function NewsTickerStart() {
 if (!this.started) {
 this.started = true
 var t = this.scrollCount
 var b = (this.scrollCount==this.items.length-1)? 0 : this.scrollCount+1
 var obj1 = this.items[t].lyr.obj
 var obj2 = this.items[b].lyr.obj
 this.timer = setInterval(this.obj+'.slide('+obj1+','+obj2+')',this.speed)
 }
}
function NewsTickerStop() {
 clearInterval(this.timer)
 this.started = false
}
function NewsTickerSlide(obj1,obj2) {
 obj1.moveBy(-this.dx,-this.dy)
 obj2.moveBy(-this.dx,-this.dy)
 if ((this.dx!=0 && Math.floor(obj2.x)==0) || (this.dy!=0 && Math.floor(obj2.y)==0)) {
  clearInterval(this.timer)
  obj1.moveTo(this.fromX,this.fromY)
  obj2.moveTo(0,0)
  this.scrollCount = (this.scrollCount==this.items.length-1)? 0 : this.scrollCount+1
  this.timer = setTimeout(this.obj+'.started=false;'+this.obj+'.start()',this.pauseLength)
 }
}
NewsTicker.count = 0