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Angle in degrees of a trendline and OBJPROP_ANGLE
When you draw a Trendline by Angle, the angle in degrees of a Trendline is only a corner "visual" tied to the monitor, not to the chart. For example, a Trendline by Angle of 45 degrees is a line of 45 degrees on the display. Zooming-in or zooming-out or compressing the vertical scale of prices, or
file MQl4BookEnglish.chm is broken....
Downloading https://www.mql4.com/files/mql4bookenglish.chm gives a broken file