Quote from CWU:
If you follow this trendline algorithm youâll do just fine. I didnât invent it but itâs in my own words. Master this, and then you can add the secondary types of trendlines.
1. Let's call the Bullish Support Line the BLSL, and the Bearish Resistance Line the BRRL.
2. Begin by always going to the hard left edge of your data (where the chart begins). What is the first signal that forms? If it's a buy signal (double top) then we are going to go to the bottom of the lowest column of O's to the left of that signal, and start a BLSL. If the first signal is a sell (double bottom), then go to the top of the highest column of X's to the left of that signal, and start a BRRL.
3. From that point on (either the first BLSL or BRRL) there will always be a trend line in place. The trend will either be positive (trading above the BLSL) or negative (trading below the BRRL).
4. When a BLSL ends, a BRRL begins. When a BRRL ends, a BLSL begins.
5. A BLSL can only end when a column of Oâs penetrates it, and it's on a sell signal. Penetration means the column of O's not only landed on the BLSL, but went at least one or more boxes below it.
6. A BRRL can only end when a column of Xâs penetrates it, and it's on a buy signal. Penetration means the column of X's not only landed on the BRRL, but went at least one or more boxes above it.
7. If a BLSL is the active line, and a column of O's come down and stops directly on the BLSL, and then reverses back up, then drop the BLSL down one box so it's directly under this most recent column of O's, and that is where it will continue from.
8. If a BRRL is the active line, and a column of X's rises up and stops directly on the BRRL, and then reverses back down, then raise the BRRL up one box so it's directly over this most recent column of X's and that is where it will continue from.