// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © alexgrover
//@version=6
indicator('Kênh giá pivot', 'Pivot Bands - Việt hoá bởi Code2trade', overlay = true, max_bars_back = 5000)
//----
length = input(100, 'Số lượng nến tính toán')
astart = input(1, 'Vị trí A-High', tooltip = 'Vẽ trend từ 2 đỉnh gần nhất thì A high = 1 và B high = 0. Nếu vẽ trend từ 3 đỉnh gần nhất thì A high = 2 và B = 0')
aend = input(0, 'Vị trí B-High ')
bstart = input(1, 'Vị trí A-Low ')
bend = input(0, 'Vị trí B-Low ')
csrc = input(false, 'Dùng nguồn tính toán khác?')
src = input(close, 'Custom Source')
//----
up = ta.pivothigh(csrc ? src : high, length, length)
dn = ta.pivotlow(csrc ? src : low, length, length)
//----
n = bar_index
a1 = ta.valuewhen(not na(up), n, astart)
b1 = ta.valuewhen(not na(dn), n, bstart)
a2 = ta.valuewhen(not na(up), n, aend)
b2 = ta.valuewhen(not na(dn), n, bend)
//----
line upper = line.new(n[n - a1 + length], up[n - a1], n[n - a2 + length], up[n - a2], extend = extend.right, color = color.blue, width = 2)
line lower = line.new(n[n - b1 + length], dn[n - b1], n[n - b2 + length], dn[n - b2], extend = extend.right, color = color.orange, width = 2)
line.delete(upper[1])
line.delete(lower[1])
//----
label ahigh = label.new(n[n - a1 + length], up[n - a1], 'A-High', color = color.blue, style = label.style_label_down, textcolor = color.white, size = size.small)
label bhigh = label.new(n[n - a2 + length], up[n - a2], 'B-High', color = color.blue, style = label.style_label_down, textcolor = color.white, size = size.small)
label alow = label.new(n[n - b1 + length], dn[n - b1], 'A-Low', color = color.orange, style = label.style_label_up, textcolor = color.white, size = size.small)
label blow = label.new(n[n - b2 + length], dn[n - b2], 'B-Low', color = color.orange, style = label.style_label_up, textcolor = color.white, size = size.small)
label.delete(ahigh[1])
label.delete(bhigh[1])
label.delete(alow[1])
label.delete(blow[1])
//----
plot(up, 'Pivot High\'s', color.new(color.blue, 0), 4, style = plot.style_circles, offset = -length, join = true)
plot(dn, 'Pivot Low\'s', color.new(color.orange, 0), 4, style = plot.style_circles, offset = -length, join = true)