revoluteJointDef.localAnchorA y 轴看起来不对

revoluteJointDef.localAnchorA y-axes looks wrong

this 开始,我希望下面的 RevoluteJoint bodyB 高于 y 轴上的蓝色框 - 设置 revoluteJointDef.localAnchorA?

flame_forge2d: ^0.11.0
    class Box extends BaseBox { // just a BodyComponent for same shape
      BaseBox? boxB;
      Box(position, paint, [this.boxB]) : super(position, paint);
    
      @override
      Body createBody() {
        super.createBody();
    
        if (this.boxB != null) {
          paint.color = Colors.blue;

          final revoluteJointDef = RevoluteJointDef();
          revoluteJointDef.bodyA = body;
          revoluteJointDef.bodyB = this.boxB!.body;

          revoluteJointDef.localAnchorA.setFrom(Vector2(1, 1));

          RevoluteJoint joint = RevoluteJoint(revoluteJointDef);
          world.createJoint(joint);
        }
        return body;
      }
    }

我希望它是这样的:

在flame_forge2d 0.11.0中坐标系在y-axis上翻转为与Flame相同的坐标系,因此较大的y-values会导致进一步向下,而不是像普通的 forge2d 那样更上一层楼。

只需取反锚点的 y-value 即可得到预期结果:

revoluteJointDef.localAnchorA.setFrom(Vector2(1, -1));