This ProBuilder code snippet demonstrates how to plot a moving average curve in the past using segments. The code uses the `DRAWSEGMENT` function to visually represent historical data points on a chart, which is particularly useful for analyzing trends over time.

period = 20
decay = 11
avg = average[period](customclose)
DRAWTEXT("*",barindex[decay],avg,Serif,Bold,12) coloured(200,200,0)
drawsegment(barindex[decay],avg,barindex[decay+1],avg[1])
RETURN avg as "MA"

Explanation of the Code:

• Variable Initialization: The variables period and decay are set to 20 and 11, respectively. Here, period represents the number of bars used for calculating the moving average, and decay specifies how many bars in the past the visualization starts.
• Moving Average Calculation: The avg variable computes the moving average of the customclose prices over the specified period.
• Drawing Text: The DRAWTEXT function places an asterisk (*) at the position specified by barindex[decay] and the moving average value avg. This serves as a visual marker. The text is styled with the Serif font, in bold, and size 12, colored in an RGB value of (200,200,0).
• Drawing Segments: The drawsegment function connects two points to draw a line segment. It starts from the current decay position to the next, effectively connecting the moving average values from one bar to the next. This visualizes the moving average as a continuous line.
• Return Statement: Finally, the moving average avg is returned as “MA”, which can be used for further analysis or displayed on the chart.

This snippet is useful for traders or analysts who want to visually track the behavior of a moving average over time, directly on historical chart data.