Matlab angle between two points [duplicate]

StackOverflow https://stackoverflow.com/questions/22944984

  •  30-06-2023
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Question

I am looking for an algorithm to calculate the angle between two points (defined by x and y valaue) in an image. The angle should be between the horizontal-line of one of these points and the line that connects the two points.

How can I do that?

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Solution

For points (x1,y1) and (x2,y2) use this:

atan2(y2-y1,x2-x1)

This will return the angle between a horizontal vector from (x1,y1) to (x1+1,y1) and the vector from (x1,y1) to (x2,y2).

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