Trend lines, rays, extended and arrowed lines

用通俗的话解释

In an uptrend each pullback tends to stop a little higher than the last. Joining those lows with a line shows the trend's path; as long as the price stays above it, the trend is intact. A ray extends the line into the future, an extended line both ways, and an arrowed line simply points.

计算方法

Click two points. For an uptrend, connect two rising lows; for a downtrend, two falling highs. A third touch makes the line more meaningful.

Price on the line at any time = price at point A + slope × (time − time at point A)
slope = (price B − price A) ÷ (time B − time A)

如何使用

• Buy near a rising trend line in an uptrend; sell near a falling one in a downtrend.
• A clear break and close through the line warns the trend may be over.
• Use the Extend setting to project the line into the future as a ray.

得出结论

• Steeper lines break sooner; gentle lines last longer.
• After a break, the old line often becomes resistance (or support) on a retest.

注意事项

• Lines drawn through candle bodies versus wicks give different results; be consistent.
• Two points always make a line; three touches make it significant.

一点历史

Trend lines are among the oldest chart tools, drawn by chart readers for more than a century.