Libgdx Box2D平滑的角度旋转 [英] Libgdx Box2D smooth angular rotation

问题描述

我目前正在libgdx中开发一个飞行游戏，您可以用鼠标光标控制小鸟的旋转.现在，小鸟将立即旋转到光标位置.我的目标是使鸟类旋转稍微滞后一些，以使飞行看起来更平稳.旋转阻尼将不起作用，因为我正在使用setTransform()方法.我会对任何建议感到非常高兴，这是控制旋转的代码，在render方法中被称为每一帧:

I'm currently developing a flying game in libgdx where you can control the rotation of a bird with the mouse cursor. Right now the bird will instantly rotate to the cursor position. I'm aiming to make the bird rotation lag behind a little bit to make the flying seem more smooth. Rotational damping wont work because i am using the setTransform() method. I would be very happy about any suggestions, this is the code controlling the rotation, it's called every frame in the render method:

    //get cursor pos
    cursorPos.set(Gdx.input.getX(), Gdx.input.getY(), 0);
    camera.unproject(cursorPos);
    //get bird pos
    birdPos.set(body.getPosition().x, body.getPosition().y, 0);
    //birdpos-cursorpos
    birdPos.sub(cursorPos);
    //new vector which is pointing from bird to cursor
    direction.set(birdPos.x, birdPos.y);
    //get current linear velocity
    movement.set(body.getLinearVelocity());
    //apply rotation to bird if cursor is not too close
    if (Math.sqrt(Math.pow(direction.x, 2) + Math.pow(direction.y, 2)) > 1) {
        body.setTransform(body.getPosition().x, body.getPosition().y,   direction.angleRad());
        }

推荐答案

我假设这段代码在您的更新循环中.

I'm assuming this code is in your update loop.

创建实例变量angleTarget.

Create an instance variable angleTarget.

每个更新循环:

1. 将angleTarget设置为鼠标角度.

1. Set angleTarget to your mouse angle.

使用setPosition将实际的身体角度设置为:body.angle = body.angle +(angleTarget-body.angle)* 0.05

Use setPosition to set the actual body angle to: body.angle = body.angle + (angleTarget - body.angle) * 0.05

通常，将表达式放入名为lerp的函数中，该函数表示线性插值.查找"lerp函数"以了解有关此内容的更多信息.

Usually that expression is put in a function called lerp, which stands for linear interpolation. Look up 'lerp function' to read more about this.

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