如何使用cocos2d制作特定方向的箭头？

发布于 2024-12-15 05:03:01 字数 829 浏览 6 评论 0原文

我想要两个物体排成一排，如下所示，并让一个物体从下方拍摄它们，如下所示。

                0 0 0 0 0 0 




                     0

较低的物体始终处于其位置，并将拍摄到上面的一个，我想制作箭头，因为用户将在 iPhone 的屏幕上移动手指，如下所示，

                 0 0 0 0 0 0 

                   \
                    \
                     \
                      0

如果移动手指，则

                  0 0 0 0 0 0                             
                      |
                      |
                      | 
                      0

在屏幕上向右移动一个手指，然后箭头应分别移动，如

                  0 0 0 0 0 0                             
                          /
                         /
                        /
                      0

我如何实现此逻辑，如果我有多个数组的图像并根据角度或其他方式使用它们，但我想要它的准确性。

谢谢

原文

I want two few objects in one row, like below and have an object shooting them from downwards, like as below

                0 0 0 0 0 0 




                     0

The lower be always on its position, and will shoot to uper one,
I want to make arrow as user will move its finger on the screen of iPhone, like below

                 0 0 0 0 0 0 

                   \
                    \
                     \
                      0

if move finger then

                  0 0 0 0 0 0                             
                      |
                      |
                      | 
                      0

In move one finger on screen more towards right, then arrow should move respectively as

                  0 0 0 0 0 0                             
                          /
                         /
                        /
                      0

How can I implement this logic, should I have multiple images of arrays and use them according to angle, or what, but I want accuracy in it.

Thanks

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网名女生简单气质 2024-12-22 05:03:01

不需要多个图像......只需在 TouchMoved 方法中旋转箭头图像

即可尝试该代码。

UITouch *touch = [touches anyObject];
CGPoint location = [touch locationInView:[touch view]];
location = [[CCDirector sharedDirector] convertToGL:location];


// Set up initial location of projectile
CGSize winSize = [[CCDirector sharedDirector] winSize];

// Rotate player to face shooting direction
CGPoint shootVector = ccpSub(location, sprite.position);
CGFloat shootAngle = ccpToAngle(shootVector);
CGFloat cocosAngle = CC_RADIANS_TO_DEGREES(-1 * shootAngle);

CGFloat curAngle = _player.rotation;
CGFloat rotateDiff = cocosAngle - curAngle;    
if (rotateDiff > 180)
    rotateDiff -= 360;
if (rotateDiff < -180)
    rotateDiff += 360;    

CGFloat rotateSpeed = 360; // degrees per second
CGFloat rotateDuration = fabs(rotateDiff / rotateSpeed);

[yoursprite runAction:[CCSequence actions:
                    [CCRotateTo actionWithDuration:rotateDuration angle:cocosAngle],
                    [CCCallFunc actionWithTarget:self selector:@selector(finishShoot)],
                    nil]];

There is no need of multiple images.... just rotate your arrow image in touchesMoved method

Try that code.

UITouch *touch = [touches anyObject];
CGPoint location = [touch locationInView:[touch view]];
location = [[CCDirector sharedDirector] convertToGL:location];


// Set up initial location of projectile
CGSize winSize = [[CCDirector sharedDirector] winSize];

// Rotate player to face shooting direction
CGPoint shootVector = ccpSub(location, sprite.position);
CGFloat shootAngle = ccpToAngle(shootVector);
CGFloat cocosAngle = CC_RADIANS_TO_DEGREES(-1 * shootAngle);

CGFloat curAngle = _player.rotation;
CGFloat rotateDiff = cocosAngle - curAngle;    
if (rotateDiff > 180)
    rotateDiff -= 360;
if (rotateDiff < -180)
    rotateDiff += 360;    

CGFloat rotateSpeed = 360; // degrees per second
CGFloat rotateDuration = fabs(rotateDiff / rotateSpeed);

[yoursprite runAction:[CCSequence actions:
                    [CCRotateTo actionWithDuration:rotateDuration angle:cocosAngle],
                    [CCCallFunc actionWithTarget:self selector:@selector(finishShoot)],
                    nil]];

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