拆解学习7-时间限制，收益图表

testStartYear = input.int(1997, title='start year', minval=1997, maxval=3000, group='BACKTEST')
testStartMonth = input.int(06, title='start month', minval=1, maxval=12, group='BACKTEST')
testStartDay = input.int(01, title='start day', minval=1, maxval=31, group='BACKTEST')
testPeriodStart = timestamp(testStartYear, testStartMonth, testStartDay, 0, 0)
testStopYear = input.int(3333, title='stop year', minval=1980, maxval=9999, group='BACKTEST')
testStopMonth = input.int(12, title='stop month', minval=1, maxval=12, group='BACKTEST')
testStopDay = input.int(31, title='stop day', minval=1, maxval=31, group='BACKTEST')
testPeriodStop = timestamp(testStopYear, testStopMonth, testStopDay, 0, 0)
testPeriod = time >= testPeriodStart and time <= testPeriodStop ? true : false

testPeriodStart = timestamp(testStartYear, testStartMonth, testStartDay, 0, 0)
testPeriodStop = timestamp(testStopYear, testStopMonth, testStopDay, 0, 0)
//开始和结束的时间戳，可以精确到分钟，用于限制策略的使用范围

show_performance = input.bool(true, 'Show Monthly Performance ?', group='Performance - credits: @QuantNomad')
prec = input(2, 'Return Precision', group='Performance - credits: @QuantNomad')
if show_performance
    new_month = month(time) != month(time[1])
    new_year  = year(time)  != year(time[1])
   
    eq = strategy.equity
   
    bar_pnl = eq / eq[1] - 1
   
    cur_month_pnl = 0.0
    cur_year_pnl  = 0.0
   
    // Current Monthly P&L
    cur_month_pnl := new_month ? 0.0 :
                     (1 + cur_month_pnl[1]) * (1 + bar_pnl) - 1
   
    // Current Yearly P&L
    cur_year_pnl := new_year ? 0.0 :
                     (1 + cur_year_pnl[1]) * (1 + bar_pnl) - 1  
   
    // Arrays to store Yearly and Monthly P&Ls
    var month_pnl  = array.new_float(0)
    var month_time = array.new_int(0)
   
    var year_pnl  = array.new_float(0)
    var year_time = array.new_int(0)
   
    last_computed = false
   
    if (not na(cur_month_pnl[1]) and (new_month or barstate.islastconfirmedhistory))
        if (last_computed[1])
            array.pop(month_pnl)
            array.pop(month_time)
           
        array.push(month_pnl , cur_month_pnl[1])
        array.push(month_time, time[1])
   
    if (not na(cur_year_pnl[1]) and (new_year or barstate.islastconfirmedhistory))
        if (last_computed[1])
            array.pop(year_pnl)
            array.pop(year_time)
           
        array.push(year_pnl , cur_year_pnl[1])
        array.push(year_time, time[1])
   
    last_computed := barstate.islastconfirmedhistory ? true : nz(last_computed[1])
   
    // Monthly P&L Table    
    var monthly_table = table(na)
   
    if (barstate.islastconfirmedhistory)
        monthly_table := table.new(position.bottom_right, columns = 14, rows = array.size(year_pnl) + 1, border_width = 1)
   
        table.cell(monthly_table, 0,  0, "",     bgcolor = #cccccc)
        table.cell(monthly_table, 1,  0, "Jan",  bgcolor = #cccccc)
        table.cell(monthly_table, 2,  0, "Feb",  bgcolor = #cccccc)
        table.cell(monthly_table, 3,  0, "Mar",  bgcolor = #cccccc)
        table.cell(monthly_table, 4,  0, "Apr",  bgcolor = #cccccc)
        table.cell(monthly_table, 5,  0, "May",  bgcolor = #cccccc)
        table.cell(monthly_table, 6,  0, "Jun",  bgcolor = #cccccc)
        table.cell(monthly_table, 7,  0, "Jul",  bgcolor = #cccccc)
        table.cell(monthly_table, 8,  0, "Aug",  bgcolor = #cccccc)
        table.cell(monthly_table, 9,  0, "Sep",  bgcolor = #cccccc)
        table.cell(monthly_table, 10, 0, "Oct",  bgcolor = #cccccc)
        table.cell(monthly_table, 11, 0, "Nov",  bgcolor = #cccccc)
        table.cell(monthly_table, 12, 0, "Dec",  bgcolor = #cccccc)
        table.cell(monthly_table, 13, 0, "Year", bgcolor = #999999)
   
   
        for yi = 0 to array.size(year_pnl) - 1
            table.cell(monthly_table, 0,  yi + 1, str.tostring(year(array.get(year_time, yi))), bgcolor = #cccccc)
           
            y_color = array.get(year_pnl, yi) > 0 ? color.new(color.teal, transp = 40) : color.new(color.gray, transp = 40)
            table.cell(monthly_table, 13, yi + 1, str.tostring(math.round(array.get(year_pnl, yi) * 100, prec)), bgcolor = y_color, text_color=color.new(color.white, 0))
           
        for mi = 0 to array.size(month_time) - 1
            m_row   = year(array.get(month_time, mi))  - year(array.get(year_time, 0)) + 1
            m_col   = month(array.get(month_time, mi))
            m_color = array.get(month_pnl, mi) > 0 ? color.new(color.teal, transp = 40) : color.new(color.gray, transp = 40)
           
            table.cell(monthly_table, m_col, m_row, str.tostring(math.round(array.get(month_pnl, mi) * 100, prec)), bgcolor = m_color, text_color=color.new(color.white, 0))

//此段代码用于图显月收益+年收益数据