Struct liquidfun::box2d::dynamics::joints::revolute_joint::RevoluteJointDef
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pub struct RevoluteJointDef {
pub local_anchor_a: Vec2,
pub local_anchor_b: Vec2,
pub reference_angle: Float32,
pub enable_limit: bool,
pub lower_angle: Float32,
pub upper_angle: Float32,
pub enable_motor: bool,
pub motor_speed: Float32,
pub max_motor_torque: Float32,
}Revolute joint definition. This requires defining an anchor point where the bodies are joined. The definition uses local anchor points so that the initial configuration can violate the constraint slightly. You also need to specify the initial relative angle for joint limits. This helps when saving and loading a game. The local anchor points are measured from the body's origin rather than the center of mass because: 1. you might not know where the center of mass will be. 2. if you add/remove shapes from a body and recompute the mass, the joints will be broken.
Fields
local_anchor_a | Initialize the bodies, anchors, and reference angle using a world anchor point. The local anchor point relative to bodyA's origin. |
local_anchor_b | The local anchor point relative to bodyB's origin. |
reference_angle | The bodyB angle minus bodyA angle in the reference state (radians). |
enable_limit | A flag to enable joint limits. |
lower_angle | The lower angle for the joint limit (radians). |
upper_angle | The upper angle for the joint limit (radians). |
enable_motor | A flag to enable the joint motor. |
motor_speed | The desired motor speed. Usually in radians per second. |
max_motor_torque | The maximum motor torque used to achieve the desired motor speed. Usually in N-m. |