This ProBuilder script is designed to detect and visualize changes in market trends using fractals. It identifies higher highs and lower lows, marking the beginning of new trends with arrows and segments on a trading chart.

defparam calculateonlastbars=10000
cp = 3
once lastpoint = 0

if high[cp] >= highest[2*cp+1](high) then
    PEAK = 1
else
    PEAK = 0
endif

if low[cp] <= lowest[2*cp+1](low) then
    TROUGH = -1
else
    TROUGH = 0
endif

if PEAK = 1 then
    TOPy = high[cp]
    TOPx = barindex[cp]
endif

if TROUGH = -1 then
    BOTy = low[cp]
    BOTx = barindex[cp]
endif

if PEAK>0 and (lastpoint=-1 or lastpoint=0) then
    DRAWSEGMENT(lastX,lastY,TOPx,TOPy)
    COLOURED(200,0,0,255)
    DRAWTEXT("■",TOPx,TOPy,Dialog,Bold,20)
    coloured(200,0,0,255)
    lastpoint = 1
    lastX = TOPx
    lastY = TOPy
endif

if TROUGH<0 and (lastpoint=1 or lastpoint=0) then
    DRAWSEGMENT(lastX,lastY,BOTx,BOTy)
    COLOURED(0,200,0,255)
    DRAWTEXT("■",BOTx,BOTy,Dialog,Bold,20)
    coloured(0,200,0,255)
    lastpoint = -1
    lastX = BOTx
    lastY = BOTy
endif

//TREND ATTEMPT
atr=AverageTrueRange[14](close)
if TOPy > TOPy[1] and topy<>lasttop then
    drawarrowup(barindex,low-atr/2)
    coloured(0,200,0)
    lasttop=topy
    trendup = 1
else
    trendup = 0
endif

RETURN TOPy as "TOPy", BOTY as "BOTy", trendup as "trendup"

This script performs several key operations to detect and visualize trend changes:

• Fractal Detection: It checks for fractal peaks and troughs based on the highest and lowest values within a specified window. A peak is identified if the current high is the highest in the window, and similarly, a trough is identified if the current low is the lowest.
• Visualization: When a new peak or trough is identified, the script draws a segment from the last point to the current point and places a colored square at the current point. This helps in visualizing the trend changes.
• Trend Change Detection: The script also checks if the current peak is higher than the previous peak. If true, it draws an upward arrow indicating a potential uptrend start.
• Output Variables: It returns the values of the latest peak and trough, and a flag indicating if an uptrend has been detected.

This approach helps traders visually identify significant trend changes, potentially aiding in decision-making processes.