我已经在flash中构建了一个应用程序，它是一个非常流畅运行的大型应用程序，但它是一个比应用程序窗口更远的图表列表，所以我使用垂直滚动条和一个掩码来显示它们。
问题是当你向下滚动时，一切都变得不稳定，任何Tween或移动和帧率通常都会低得多。
当你到达底部时，尽管在整个滚动条中有相同数量的动画片段和相同数量的细节，但是它是无法忍受的，所以我不明白为什么应该有这么大的性能影响下降一点。 / p>
任何人都有任何关于可能导致这种情况的想法吗？
这里要求的是构建图表的代码部分：
var local_data = SharedObject.getLocal("user_data");
Slide_Tracker = local_data.data.user_data;
var timespan:MovieClip = this.timescale.span;
for (i=0; i<Slide_Tracker.length; i++) {
var current_date = new Date(Slide_Tracker[i].date_int);
var date_int:Number = Slide_Tracker[i].date_int;
var x_range:Number = 30;
var sorted_date:Object = new Object(sortDate(Slide_Tracker[i].date_int));
var date_string:String = sorted_date.string;
var startX:Number = 0;
date_nav.push(Slide_Tracker[i].date_int);
if (i == 0) {
for (s=0; s<Graphs.length; s++) {
var Chart:MovieClip = Graphs[s].chartArea.createEmptyMovieClip("chart", 10);
Chart._x = 0;
Chart._y = 0;
Charts.push(Chart);
Chart._parent.dotSpace.index = s;
Chart._parent.dotSpace.onRollOver = function() {
this.followDot._visible = true;
this.followDot.enabled = false;
this.onMouseMove = function() {
if(this._parent.chart.viewPortRatio == undefined) {
var viewPortRatio:Number = 1;
}
else {
var viewPortRatio:Number = this._parent.chart.viewPortRatio;
}
var xMouse:Number = this._xmouse;
var xToArray:Number = Math.round(((xMouse-this._parent.chart._x)*viewPortRatio));
this.followDot._y = lineArray[this.index][xToArray].y;
trace(xToArray);
this.followDot._x = xMouse;
};
};
Chart._parent.dotSpace.onRollOut = function() {
this.followDot._visible = false;
delete this.onMouseMove;
};
}
} else if (i>0) {
var past_date:Date = new Date(Slide_Tracker[i-1].date_int);
var date_diff:Number = Math.round((current_date-past_date)/86400000);
}
for (s=0; s<Slide_Tracker[i].val_arr.length; s++) {
var Slide_y:Number = 100-Slide_Tracker[i].val_arr[s];
var Chart:MovieClip = Graphs[s].chartArea.chart;
with (Chart) {
beginFill(0x000066,15);
lineStyle(2,0x000066,80);
if (i == 0) {
moveTo(startX,Slide_y);
Xcoords[s].push(startX);
Ycoords[s].push(Slide_y);
} else if (i>0) {
var index:Number = Xcoords[s].length-1;
var prevX:Number = Xcoords[s][index];
var prevY:Number = Ycoords[s][index];
moveTo(prevX,prevY);
var newX:Number = prevX+(date_diff*(895.9/x_range));
var newY:Number = Slide_y;
lineTo(newX,newY);
lineStyle(6,0x000066,0);
lineTo(newX,100);
lineTo(prevX,100);
lineTo(prevX,prevY);
convertLineToArray(s,prevX,newX,prevY,newY);
Xcoords[s].push(newX);
Ycoords[s].push(newY);
}
endFill();
lineStyle(0,0x000066,80);
with (Graphs[s].chartArea.timescale.span) {
var barName:String = Slide_Tracker[i].date_int;
var thisBar:MovieClip = attachMovie("bar", barName, this.getNextHighestDepth()+i);
if (Slide_y != 100) {
var barY:Number = 100-Slide_y;
} else {
var barY:Number = 0;
}
if (i == 0) {
thisBar._x = 1;
thisbar._height = barY/4;
spanXcoords[s].push(1);
spanYcoords[s].push(barY/4);
} else if (i>0) {
var index:Number = spanXcoords[s].length-1;
var spanPrevX:Number = spanXcoords[s][index];
var spanPrevY:Number = spanYcoords[s][index];
var spanNewX:Number = spanPrevX+(date_diff*3);
var spanNewY:Number = barY/4;
thisBar._x = spanNewX;
thisBar._height = barY/4;
spanXcoords[s].push(spanNewX);
spanYcoords[s].push(spanNewY);
}
thisBar._y += 25;
selector_bars[s].push(thisBar);
}
}
Chart.setMask(Chart._parent.chart_mask);
var dot_name:String = new String(Graphs[s]._name+"_dot"+i);
var dotObj:Object = new Object();
if (prevX != undefined) {
dotObj._x = newX;
} else {
dotObj._x = startX;
}
dotObj._y = Slide_y;
Chart._parent.dotArea.attachMovie("graph_dot",dot_name,Graphs[s].chartArea.dotArea.getNextHighestDepth(),dotObj);
Chart._parent.dotArea.swapDepths(99999);
var thisDot:MovieClip = eval(Graphs[s]+".chartArea.dotArea."+dot_name);
Graphs_dots[s].push(thisDot);
thisDot.date_string = date_string;
thisDot.date_int = date_int;
thisDot.percent = Slide_Tracker[i].val_arr[s];
thisDot.onRollOver = function() {
this.gotoAndStop("over");
var dot_Coords:Object = {x:this._x, y:this._y};
var viewPortRatio:Number = this._parent._parent.chart.viewPortRatio;
var offsetX:Number = this._parent._parent.chart.offsetX;
if (viewPortRatio == undefined) {
viewPortRatio = 1;
}
if (offsetX == undefined) {
offsetX = 0;
}
var text_x:Number = (dot_Coords.x/viewPortRatio)+offsetX;
var text_y:Number = dot_Coords.y;
if (dot_Coords.y<50) {
text_y += 60;
} else {
text_y -= 20;
}
var Textbox:Object = {name:"dot_info", container:this._parent._parent._parent, x:text_x, y:text_y, text:this.date_string+"\n"+this.percent+"%"};
var dotText:TextField = generateTextbox(Textbox);
if (dotText._x>448) {
dotText._x -= dotText._width;
}
};
thisDot.onRollOut = thisDot.onReleaseOutside=function () {
this.gotoAndStop("norm");
killTxt(this._parent._parent._parent.dot_info);
delete dot_Coords;
};
}
chartsWidth = Chart._width;
}
这是我的滚动条代码：
scrolling = function () {
var scrollHeight:Number = scrollTrack._height - btnUp._height - btnDown._height;
var contentHeight:Number = contentMain._height;
var scrollFaceHeight:Number = scrollFace._height;
var maskHeight:Number = maskedView._height;
var initPosition:Number = scrollFace._y=scrollTrack._y + btnUp._height;
var initContentPos:Number = contentMain._y;
var finalContentPos:Number = maskHeight-contentHeight+initContentPos;
var left:Number = scrollTrack._x + (scrollTrack._width - scrollFace._width)/2.4;
var top:Number = scrollTrack._y + btnUp._height;
var right:Number = scrollTrack._x + (scrollTrack._width - scrollFace._width)/2.4;
var bottom:Number = (scrollTrack._height-scrollFaceHeight+scrollTrack._y) - btnDown._height;
var dy:Number = 0;
var speed:Number = 10;
var moveVal:Number = (contentHeight-maskHeight)/(scrollHeight-scrollFaceHeight);
scrollFace.onPress = function() {
var currPos:Number = this._y;
startDrag(this, false, left, top, right, bottom);
this.onMouseMove = function() {
dy = Math.abs(initPosition-this._y);
contentMain._y = Math.round(dy*-1*moveVal+initContentPos);
};
};
scrollFace.onMouseUp = function() {
stopDrag();
delete this.onMouseMove;
};
btnUp.onPress = function() {
this.onEnterFrame = function() {
if (contentMain._y+speed<maskedView._y) {
if (scrollFace._y<=top) {
scrollFace._y = top;
} else {
scrollFace._y -= speed/moveVal;
}
contentMain._y += speed;
} else {
scrollFace._y = top;
contentMain._y = maskedView._y;
delete this.onEnterFrame;
}
};
};
btnUp.onDragOut = function() {
delete this.onEnterFrame;
};
btnUp.onRollOut = function() {
delete this.onEnterFrame;
};
btnDown.onPress = function() {
this.onEnterFrame = function() {
if (contentMain._y-speed>finalContentPos) {
if (scrollFace._y>=bottom) {
scrollFace._y = bottom;
} else {
scrollFace._y += speed/moveVal;
}
contentMain._y -= speed;
} else {
scrollFace._y = bottom;
contentMain._y = finalContentPos;
delete this.onEnterFrame;
}
};
};
btnDown.onRelease = function() {
delete this.onEnterFrame;
};
btnDown.onDragOut = function() {
delete this.onEnterFrame;
};
var mouseListener = new Object();
mouseListener.onMouseWheel = function( wheelMotion )
{
if (wheelMotion < 0) {
if (contentMain._y-speed>finalContentPos) {
if (scrollFace._y>=bottom) {
scrollFace._y = bottom;
} else { scrollFace._y += speed/moveVal;
}
contentMain._y -= speed;
} else {
scrollFace._y = bottom;
contentMain._y = finalContentPos;
}
}
if (wheelMotion > 0) {
if (contentMain._y+speed<maskedView._y) {
if (scrollFace._y<=top) {
scrollFace._y = top;
} else {
scrollFace._y -= speed/moveVal;
}
contentMain._y += speed;
} else {
scrollFace._y = top;
contentMain._y = maskedView._y;
}
}
}
Mouse.addListener( mouseListener );
if (contentHeight<maskHeight) {
scrollFace._visible = false;
btnUp.enabled = false;
btnDown.enabled = false;
btnUp.gotoAndStop(2);
btnDown.gotoAndStop(2);
} else {
scrollFace._visible = true;
btnUp.enabled = true;
btnDown.enabled = true;
btnUp.gotoAndStop(1);
btnDown.gotoAndStop(1);
}
};
scrolling();
答案 0 :(得分：0)
我今天解决了这个问题，我只是遇到了scrollRect()函数，它只渲染了在其边界内可见的数据，只要它是位图缓存（矢量对象仍将完整呈现）是否可见）。
尽管事实上我让用户修改图形的_scaleX并将它们缓存为位图现在我仍然看到自从使用可滚动矩形交换蒙版以来绝对巨大的性能提升，因为在足够数据后这些图形超过20,000宽度。尽管它们的大小很大，但一切都很流畅。