expma.java

一份java写的期货交易程序

// Decompiled by Jad v1.5.7g. Copyright 2000 Pavel Kouznetsov.
// Jad home page: http://www.geocities.com/SiliconValley/Bridge/8617/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi 
// Source File Name:   EXPMA.java

package gnnt.MEBS.HQApplet.Indicator;

import gnnt.MEBS.HQApplet.*;
import java.awt.Graphics;
import java.awt.Rectangle;

// Referenced classes of package gnnt.MEBS.HQApplet.Indicator:
//            KLine, IndicatorBase, IndicatorPos

public class EXPMA extends KLine
{

    private final int m_iParam[] = {
        5, 20, 50
    };

    public EXPMA(IndicatorPos pos, int iPrecision)
    {
        super(pos, 0, iPrecision);
        m_strIndicatorName = "EXPMA";
        m_strParamName = new String[m_iParam.length];
        for(int i = 0; i < m_iParam.length; i++)
            m_strParamName[i] = "MA" + m_iParam[i];

    }

    public void Paint(Graphics g, Rectangle rc, KLineData data[])
    {
        if(data == null || data.length == 0)
            return;
        m_kData = data;
        Calculate();
        super.Paint(g, rc, data);
        for(int i = 0; i < m_iParam.length; i++)
            DrawLine(g, m_data[i], 0, HQApplet.rhColor.clIndicator[i]);

    }

    public void Calculate()
    {
        m_data = new float[m_iParam.length][];
        for(int i = 0; i < m_iParam.length; i++)
        {
            m_data[i] = new float[m_kData.length];
            GetEXPMA(m_iParam[i], m_data[i]);
        }

    }

    private void GetEXPMA(int n, float expma[])
    {
        float xs = 2.0F / (float)(n + 1);
        expma[0] = m_kData[0].closePrice;
        for(int i = 1; i < m_kData.length; i++)
            expma[i] = (m_kData[i].closePrice - expma[i - 1]) * xs + expma[i - 1];

    }

    protected void GetMaxMin()
    {
        super.GetMaxMin();
        for(int i = 0; i < m_iParam.length; i++)
            GetValueMaxMin(m_data[i], m_iParam[i] - 1);

    }
}