Rotating a body using the Chipmunk library

[musjj]

What's the idiomatic way of rotating a body with Chipmunk?

I'm doing something like this:

shape.Body().SetAngle(0.78)
shape.Body().SetVelocity(0, 50)

But the body still moves perfectly vertically. I realize that I can probably calculate the vector of the velocity to achieve a specific angle, but I'm wondering what's SetAngle is for if it doesn't affect the direction of the velocity?

Some examples would be appreciated.

[hajimehoshi]

I think this is not a question about Ebitengine. Please ask the author of the Chipmunk repository. Thanks,

[musjj]

Sorry about that, I couldn't find a decent community for Chipmunk so I decided to ask here (since Chipmunk seems semi-popular among Golang and Ebiten users).

[musjj]

Figured it out! The solution was to rotate the velocity vector after setting the angle:

shape.Body().SetVelocity(0, 50)

angle := shape.Body().Angle()
inc = 0.05
shape.Body().SetAngle(angle + inc)

velocity := p.shape.Body().Velocity()
other := cp.ForAngle(inc)
shape.Body().SetVelocityVector(velocity.Rotate(other))