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There is no angle from 2 anchor points. An angle requires distance divided by distance; a unit-less number. A chart has price and time. What is the angle of going 30 miles in 45 minutes? Meaningless!
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You can get the slope from a trendline: m=ΔPrice÷ΔTime. Changing the price scale, bar width, or window size, changes the apparent angle, the slope is constant. Angle is meaningless.
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You can create an angled line using one point and setting the angle (Object Properties - Objects Constants - Standard Constants, Enumerations and Structures - MQL4 Reference.) The line is drawn that angle in pixels. Changing the axes scales does NOT change the angle (and thus is meaningless.)
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If you insist, take the two price/time coordinates, convert them to pixel coordinates and then to apparent angle with arctan.
How to get the angle of a trendline and place a text object to it? - Trend Indicators - MQL4 programming forum - Page 2
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Dear Authorities, Is there a way to express the Trend angle as data for use in EA?