45 Degree Angle from Last Low/High

//@version=5
indicator('45 Degree Angle from Last Low/High', overlay=true)

// Determine whether the last point was a high or low
lastHigh = ta.highest(high, 500)
lastLow = ta.lowest(low, 500)
lastPoint = bar_index - nz(math.max(lastLow, lastHigh))

// Calculate the slope of the line
slope = 1

// Calculate the y-intercept of the line
yIntercept = lastHigh - slope * (bar_index - lastPoint)

// Plot the line
plot(slope * (bar_index - lastPoint) + yIntercept, color=color.new(color.green, 0))