How to draw a line on the bar close when the condition is met in Pine Script?

Question

满足条件时，如何在收盘价上连续画一条线？

Answer 1

You can plot with valuewhen.

Example: condition=ta.cross(ta.sma(close,20),ta.sma(close,50)) v=ta.valuewhen(condition,close,0) plot(v)

Answer 2

Can you explain further, what exactly you want to do?

• If you want to draw a line from one point, to another you can use line.new() , which could look like this:

if condition
  line.new(x1, y1, x2, y2)

• If you want to draw a series on a given condition you can use plot() and the ternary operator ?: , which could look like this:

plot(condition ? value : na) // if condition, then plot value, else plot na (like null)