A trend line connects selected price observations and extends them across a chart. It makes a slope visible. Its placement depends on your swing-selection rule, timeframe and chart scale, so there is no single objectively correct line for every chart.

Choose and Record the Anchor Points

An upward-sloping line can join two higher swing lows; a downward-sloping line can join two lower swing highs. Two points determine a line. A later touch is another observation, not proof of stronger support or resistance.

Specify whether your anchors use wick extremes or closing prices. Both are conventions with different consequences. A rule using extremes cannot be silently replaced with closes when the line is inconvenient.

Also record when each swing became recognisable. If it needs later candles for confirmation, the line was unavailable before those candles. Preserve the original screenshot when testing subsequent reactions.

The Angle on Your Screen Is Not a Market Signal

A 45-degree line is not an ideal or sustainable trend by itself. Its apparent angle changes when you zoom, resize the chart or change the price scale. Linear and logarithmic scales can also produce different lines over a large price range.

If slope is part of the strategy, define it numerically using explicit price or percentage units and elapsed time. Do not compare angles from differently scaled screenshots.

Separate Bounce and Break Rules

A bounce hypothesis expects movement away from the projected line. Define the permitted distance from the line, the observation needed for entry and the invalidation level. A candlestick filter changes the rule; it does not establish that an unfiltered entry is gambling and a filtered one is profitable.

A break hypothesis expects a crossing to continue. Decide whether a wick, trade or completed candle counts. Waiting for a close may avoid some brief crossings but changes entry timing and can miss part of a move.

After a break, price may retest the line or move away without returning. A role reversal is not guaranteed. The line is diagonal, so its projected price at a later retest must be recalculated.

Review Without Redrawing History

Keep losing examples as well as attractive bounces. If your rules permit replacing an anchor, date that change and evaluate the new line from that point forward. Do not treat a newly fitted line as though it had guided earlier trades.

Connect any setup to position sizing and an exit process. A line on a chart does not cap a loss or identify the orders and participants behind the price movement.

Risk Disclaimer: Trading involves substantial risk of loss. Past performance is not indicative of future results. See our full risk disclaimer.