The following ProBuilder code snippet demonstrates how to make the background color of a price chart blink red when the elapsed time of the current bar exceeds a specified percentage of its total duration. This visual cue can be useful for traders monitoring time-sensitive trading strategies.

defparam drawonlastbaronly=true
PeriodPercent = 30 //5% of the time remains to start blinking the chart
// ------ once
NbBar = 1
MyDay=openday
dayminutes = 1440*(MyDay-MyDay[1])
MyHour=openhour
hourminutes = 60*(MyHour-MyHour[1])
MyMin=openminute
barminutes = MyMin - MyMin[1] + hourminutes + dayminutes
barminutes=abs(barminutes)
imin = lowest[NbBar](barminutes)[1]
isec = imin*60
itime=opentime
iremain = (time-itime)
if islastbarupdate then
    if iremain>=isec*(1-(periodpercent/100)) then //blink
        if $alpha[0]=0 then
            $alpha[0]=50
        else
            $alpha[0]=0
        endif
        //backgroundcolor(255,0,0,$alpha[0])
        drawrectangle(0,0,barindex,100000) coloured(255,0,0,$alpha[0]) bordercolor(255,0,0,$alpha[0])
    endif
endif
return

This code snippet is designed to help visualize the urgency as a trading bar approaches its closure, by changing the background color dynamically based on the elapsed time percentage.

• Initialization: The script starts by setting drawonlastbaronly to true, ensuring that drawing operations affect only the last bar on the chart.
• Time Calculation: It calculates the elapsed time since the opening of the current bar in minutes, considering day, hour, and minute changes.
• Percentage Check: The script checks if the remaining time of the current bar is less than a specified percentage (30% in this case) of the total bar duration.
• Blinking Logic: If the condition is met, it toggles the transparency of the color between 50 (semi-transparent) and 0 (fully opaque) to create a blinking effect using a rectangle that spans the entire vertical range of the chart.
• Visual Feedback: The drawrectangle function is used to change the background color to red with varying transparency, providing immediate visual feedback to the user.

This example is particularly useful for developers looking to implement visual alerts based on time criteria in trading environments.