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javalibgdxbox2d

LibGDX Java set velocity at an angle

I have a problem with setting the velocity for a Body object at a certain angle (I want the body to move in a straight line at a given speed at a certain angle). The Body#setLinearVelocity method requires the X and Y directions. I don't know how to get these values from an angle (form -180 to 180 degrees). I will be grateful for your help!

Solution

  • To convert an angle to coordinates (of length 1) you can use this:

    // angle needs to be in radians. If it's in degrees multiply it by Math.PI / 180f
angle = angleDegree * Math.PI / 180f;
x = Math.cos(angle);
y = Math.sin(angle);

    Then add these parameters to the setLinearVelocity method.