volume - 成交量指标技术

Question

我拼命地试图建立一个音量指标

刚刚找到了一些音量滑块示例。我要找的如下图所示：

有哪些好的成交量指标技术可以处理？

Answer 1

我试图创造你需要的东西。请看这里。

如果它是您正在寻找的，这里是代码：

<?xml version="1.0" encoding="utf-8"?>
<s:Group xmlns:fx="http://ns.adobe.com/mxml/2009" 
     xmlns:s="library://ns.adobe.com/flex/spark" 
     xmlns:mx="library://ns.adobe.com/flex/mx" creationComplete="group1_creationCompleteHandler(event)">

<fx:Script>
    <![CDATA[
        import mx.events.FlexEvent;

        private static const BAR_HEIGHT:Number = 44;
        private static const BAR_WIDTH:Number = 5;
        private static const BAR_GAP:Number = 2;
        private static const BAR_COUNT:Number = 50;
        private static const BAR_COLOR_ACTIVE:uint = 0x00ff00;

        [Bindable]
        public var initialPercent:Number;

        private var totalBarHeight:Number;

        protected function group1_creationCompleteHandler(event:FlexEvent):void
        {
            totalBarHeight = BAR_HEIGHT * BAR_COUNT;
            drawBars(blackBars);
            update(initialPercent);
        }

        public function update(percent:Number):void {
            drawBars(greenBars, BAR_COLOR_ACTIVE, percent);
        }

        public function drawBars(where2draw:Group, color:uint = 0x000000, percent:Number = 100):void {
            //complete bars
            var completeBars:Number = Math.floor(BAR_COUNT * percent / 100); 
            where2draw.graphics.clear();
            for (var i:int = 0; i < completeBars; i++) 
            {
                var barX:Number = (BAR_WIDTH + BAR_GAP) * i;
                where2draw.graphics.beginFill(color);
                where2draw.graphics.drawRect(barX, 0, BAR_WIDTH, BAR_HEIGHT);
                where2draw.graphics.endFill();
            }
            //partial bars, if needed
            var reminderBarHeight:Number = totalBarHeight * percent / 100 - completeBars * BAR_HEIGHT;
            var barY:Number = BAR_HEIGHT - reminderBarHeight;
            var barX:Number = (BAR_WIDTH + BAR_GAP) * completeBars;
            where2draw.graphics.beginFill(color);
            where2draw.graphics.drawRect(barX, barY, BAR_WIDTH, reminderBarHeight);
            where2draw.graphics.endFill();
        }

    ]]>
</fx:Script>

<s:Group id="blackBars"/>
<s:Group id="greenBars"/>

</s:Group>

使用 ActionScript 构建它可能会更好。我创建它只是为了传达这个想法。

谈到您需要的第二个组件，它应该更容易。您可以通过在组件上绘制渐变并在值发生变化时为蒙版设置动画来实现该效果。

谢谢！

Answer 2

这是您需要的：

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
               xmlns:s="library://ns.adobe.com/flex/spark" 
               xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"
               creationComplete="application1_creationCompleteHandler(event)" backgroundColor="0x000000">

    <fx:Script>
        <![CDATA[
            import mx.events.FlexEvent;

            private static const SLIDER_HEIGHT:Number = 237;
            private static const SQUARE_HEIGHT:Number = 9;
            private static const SQUARE_GAP:Number = 3;

            protected function hslider1_changeHandler(event:Event):void
            {
                updateSlider(volumeSlider.value);
            }

            protected function application1_creationCompleteHandler(event:FlexEvent):void
            {
                var squaresNumber:Number = Math.floor((SLIDER_HEIGHT + SQUARE_GAP) / (SQUARE_HEIGHT + SQUARE_GAP));
                for (var i:int = 0; i < squaresNumber ; i++) 
                {
                    sliderMask.graphics.beginFill(0x000000);
                    sliderMask.graphics.drawRect(0, i * (SQUARE_HEIGHT + SQUARE_GAP), SQUARE_HEIGHT, SQUARE_HEIGHT);
                    sliderMask.graphics.endFill();
                }
                updateSlider(volumeSlider.value);
            }

            private function updateSlider(value:Number):void
            {
                redEntry.color = value >= 1 ? 0xbf0000 : 0x009c00;
                yellowEntry.color = value >= 1 ? 0xe0ec0b : 0x009c00;
                greenEntry.ratio = value > 50 ? 1 : value / 50;
                redEntry.ratio = value > 50 ? (value/50 - 1) * .67 + .33 : value / 50 * .33;;
                yellowEntry.ratio = value > 50 ? (value/50 - 1) * .33 + .67 : value / 50 * .67;
            }

        ]]>
    </fx:Script>

    <s:Group verticalCenter="0" horizontalCenter="0" height="{SLIDER_HEIGHT}" width="9">
        <s:Rect height="100%" width="100%" mask="{sliderMask}">
            <s:fill>
                <s:LinearGradient rotation="90">
                    <s:GradientEntry id="redEntry" ratio="0" color="0xbf0000"/>
                    <s:GradientEntry id="yellowEntry" ratio="0" color="0xe0ec0b"/>
                    <s:GradientEntry id="greenEntry" ratio="0" color="0x009c00"/>
                </s:LinearGradient>
            </s:fill>
        </s:Rect>
        <s:Group id="sliderMask"/>
    </s:Group>

    <s:HSlider verticalCenter="{SLIDER_HEIGHT / 2 + 30}" horizontalCenter="0" 
               id="volumeSlider" maximum="100" minimum="0" value="20" change="hslider1_changeHandler(event)"/>

</s:Application>

有一点需要澄清。当您一个一个添加 GradientEntry 并将每个比率设置为 0 时，前两个条目不会消失。因此，每当滑块位于 0 或 1 或介于两者之间时，我必须将黄色和红色条目更改为绿色。

干杯!