dw_scrollObj.stopScroll = function(wnId) { if ( dw_scrollObjs[wnId] ) dw_scrollObjs[wnId].endScroll();}
dw_scrollObj.doubleSpeed = function(wnId) { if ( dw_scrollObjs[wnId] ) dw_scrollObjs[wnId].speed *= 2;}
dw_scrollObj.resetSpeed = function(wnId) { if ( dw_scrollObjs[wnId] ) dw_scrollObjs[wnId].speed /= 2;}
dw_scrollObj.initScroll = function(wnId, deg, sp) { if ( dw_scrollObjs[wnId] ) { var cosine, sine; if (typeof deg == "string") { switch (deg) { case "up" : deg = 90; break; case "down" : deg = 270; break; case "left" : deg = 180; break; case "right" : deg = 0; break; default:
alert("Direction of scroll in mouseover scroll links should be 'up', 'down', 'left', 'right' or number: 0 to 360.");}
}
deg = deg % 360; if (deg % 90 == 0) { cosine = (deg == 0)? -1: (deg == 180)? 1: 0; sine = (deg == 90)? 1: (deg == 270)? -1: 0;} else { var angle = deg * Math.PI/180; cosine = -Math.cos(angle); sine = Math.sin(angle);}
dw_scrollObjs[wnId].fx = cosine / ( Math.abs(cosine) + Math.abs(sine) ); dw_scrollObjs[wnId].fy = sine / ( Math.abs(cosine) + Math.abs(sine) ); dw_scrollObjs[wnId].endX = (deg == 90 || deg == 270)? dw_scrollObjs[wnId].x:
(deg < 90 || deg > 270)? -dw_scrollObjs[wnId].maxX: 0; dw_scrollObjs[wnId].endY = (deg == 0 || deg == 180)? dw_scrollObjs[wnId].y:
(deg < 180)? 0: -dw_scrollObjs[wnId].maxY; dw_scrollObjs[wnId].startScroll(sp);}
}
dw_scrollObj.prototype.startScroll = function(speed) { if (!this.ready) return; if (this.timerId) clearInterval(this.timerId); this.speed = speed || dw_scrollObj.speed; this.lyr = document.getElementById(this.lyrId); this.lastTime = ( new Date() ).getTime(); this.on_scroll_start(); this.timerId = setInterval(this.animString + ".scroll()", 10);}
dw_scrollObj.prototype.scroll = function() { var now = ( new Date() ).getTime(); var d = (now - this.lastTime)/1000 * this.speed; if (d > 0) { var x = this.x + this.fx * d; var y = this.y + this.fy * d; if (this.fx == 0 || this.fy == 0) { if ( ( this.fx == -1 && x > -this.maxX ) || ( this.fx == 1 && x < 0 ) || ( this.fy == -1 && y > -this.maxY ) || ( this.fy == 1 && y < 0 ) ) { this.lastTime = now; this.shiftTo(this.lyr, x, y); this.on_scroll(x, y);} else { clearInterval(this.timerId); this.timerId = 0; this.shiftTo(this.lyr, this.endX, this.endY); this.on_scroll_end(this.endX, this.endY);}
} else { if ( ( this.fx < 0 && x >= -this.maxX && this.fy < 0 && y >= -this.maxY ) || ( this.fx > 0 && x <= 0 && this.fy > 0 && y <= 0 ) || ( this.fx < 0 && x >= -this.maxX && this.fy > 0 && y <= 0 ) || ( this.fx > 0 && x <= 0 && this.fy < 0 && y >= -this.maxY ) ) { this.lastTime = now; this.shiftTo(this.lyr, x, y); this.on_scroll(x, y);} else { clearInterval(this.timerId); this.timerId = 0; this.on_scroll_end(this.x, this.y);}
}
}
}
dw_scrollObj.prototype.endScroll = function() { if (!this.ready) return; if (this.timerId) clearInterval(this.timerId); this.timerId = 0; this.lyr = null;}
dw_scrollObj.prototype.on_scroll = function() {}
dw_scrollObj.prototype.on_scroll_start = function() {}
dw_scrollObj.prototype.on_scroll_end = function() {}