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旋转 Cocos2d 精灵以匹配操纵杆

发布于 2024-12-19 09:56:12 字数 187 浏览 3 评论 0原文

我在 Cocos2d 中使用 SneakyJoystick，并且尝试让精灵旋转以面向与操纵杆指向相同的方向（这是自上而下）。

我可以让它旋转以面对它，但随着旋转每帧左右更新，它会卡入到位。

如何让精灵平滑地朝目标角度旋转，而不跳到目标角度？我无法弄清楚如何使用 CCRotateTo 执行此操作，因为旋转的角度可能随时发生变化。

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昔日梦未散 2024-12-26 09:56:12

我最终通过使用我制作的旋转方法简单地解决了这个问题，该方法在每次更新时以正确的量沿正确的方向旋转节点/精灵。

- (void)rotateNode:(CCNode*)aNode degrees:(float)targetRotation withSpeed:(float)rotationSpeed withTimeDelta:(ccTime)dt
{
    rotationSpeed = rotationSpeed * dt;

    // Convert the difference between the two angles to radians
    float diff = (targetRotation - aNode.rotation) * (M_PI / 180);
    // Find the rotation of the vector created by the sin and cos of the difference
    float rotationDifference = atan2f(sinf(diff),cosf(diff));
    // Rotate the clip accordingly
    aNode.rotation += MAX(
                         MIN(
                             (180/M_PI) * rotationDifference,rotationSpeed), -rotationSpeed
                         );
}

I ended up fixing this simply by using a rotation method that I made, which rotates the node/sprite in the correct direction at the correct amount each update.

- (void)rotateNode:(CCNode*)aNode degrees:(float)targetRotation withSpeed:(float)rotationSpeed withTimeDelta:(ccTime)dt
{
    rotationSpeed = rotationSpeed * dt;

    // Convert the difference between the two angles to radians
    float diff = (targetRotation - aNode.rotation) * (M_PI / 180);
    // Find the rotation of the vector created by the sin and cos of the difference
    float rotationDifference = atan2f(sinf(diff),cosf(diff));
    // Rotate the clip accordingly
    aNode.rotation += MAX(
                         MIN(
                             (180/M_PI) * rotationDifference,rotationSpeed), -rotationSpeed
                         );
}

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我们只是彼此的过ke 2024-12-26 09:56:12

您是否尝试过：

[CCRotateBy actionWithDuration:0.5f angle:CC_DEGREES_TO_RADIANS(90.0f)];

获取上次更新与当前更新之间的角度，如果您想要角色有设定的转身时间，您可以根据角度大小来缩放持续时间。

Have you tried:

[CCRotateBy actionWithDuration:0.5f angle:CC_DEGREES_TO_RADIANS(90.0f)];

Obtain the Angle between the last Update the current Update, also if you wanted it so the character had a set time to turn around, you can scale your duration by the amount of the angle.

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