// 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 = 9000
        this.inc = 2
        this.speed = 1
        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