Sprite kit 向CGPoint SpriteKit应用脉冲

我是SpriteKit的新手，游戏开发者，事实上我只是在学习。所以我到了一个点，我知道如何将一堆节点移动到一个用户点击的位置。到目前为止，我试图计算一个虚拟的直角三角形，得到基于边的角度的正余弦。不幸的是，这给了我一个非常强烈的冲动，没有真正考虑用户点击位置。

有什么想法吗

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提前谢谢

在Ray Wenderlich的教程中查找拍摄射弹部分：

将教程中的代码更改如下：

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {

    // 1 - Choose one of the touches to work with
    UITouch * touch = [touches anyObject];
    CGPoint location = [touch locationInNode:self];

    // 2 - Set up initial location of projectile
    SKSpriteNode * projectile = [self childNodeWithName:@"desirednode"];
    //make projectile point to your desired node.

    // 3- Determine offset of location to projectile
    CGPoint offset = rwSub(location, projectile.position);

    // 4 - Bail out if you are shooting down or backwards. You can ignore this if required.
    if (offset.x <= 0) return;

    // 5 - OK to add now - we've double checked position
    [self addChild:projectile];

    // 6 - Get the direction of where to shoot
    CGPoint direction = rwNormalize(offset);

    // 7 - Make it shoot far enough to be guaranteed off screen
    float forceValue = 200; //Edit this value to get the desired force.
    CGPoint shootAmount = rwMult(direction, forceValue);

    //8 - Convert the point to a vector
    CGVector impulseVector = CGVectorMake(shootAmount.x, shootAmount.y);
    //This vector is the impulse you are looking for.

    //9 - Apply impulse to node.
    [projectile.physicsBody applyImpulse:impulseVector];

}

-（void）touchesend:（NSSet*）toucheevent:（UIEvent*）event{
//1-选择要使用的触摸之一
UITouch*touch=[触摸任何对象]；
CGPoint位置=[触摸位置Innode:self]；
//2-设置弹丸的初始位置
SKSpriteNode*射弹=[自身子节点名称：@“desirednode”]；
//使投射物指向所需的节点。
//3-确定位置对射弹的偏移
CGPoint offset=rwSub（位置，射弹位置）；
//4-如果你正在向下或向后射击，你可以放弃。如果需要，你可以忽略这一点。
如果（offset.x在Ray Wenderlich的教程中查找拍摄射弹部分：


将教程中的代码更改如下：

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {

    // 1 - Choose one of the touches to work with
    UITouch * touch = [touches anyObject];
    CGPoint location = [touch locationInNode:self];

    // 2 - Set up initial location of projectile
    SKSpriteNode * projectile = [self childNodeWithName:@"desirednode"];
    //make projectile point to your desired node.

    // 3- Determine offset of location to projectile
    CGPoint offset = rwSub(location, projectile.position);

    // 4 - Bail out if you are shooting down or backwards. You can ignore this if required.
    if (offset.x <= 0) return;

    // 5 - OK to add now - we've double checked position
    [self addChild:projectile];

    // 6 - Get the direction of where to shoot
    CGPoint direction = rwNormalize(offset);

    // 7 - Make it shoot far enough to be guaranteed off screen
    float forceValue = 200; //Edit this value to get the desired force.
    CGPoint shootAmount = rwMult(direction, forceValue);

    //8 - Convert the point to a vector
    CGVector impulseVector = CGVectorMake(shootAmount.x, shootAmount.y);
    //This vector is the impulse you are looking for.

    //9 - Apply impulse to node.
    [projectile.physicsBody applyImpulse:impulseVector];

}

-（void）touchesend:（NSSet*）toucheevent:（UIEvent*）event{
//1-选择要使用的触摸之一
UITouch*touch=[触摸任何对象]；
CGPoint位置=[触摸位置Innode:self]；
//2-设置弹丸的初始位置
SKSpriteNode*射弹=[自身子节点名称：@“desirednode”]；
//使投射物指向所需的节点。
//3-确定位置对射弹的偏移
CGPoint offset=rwSub（位置，射弹位置）；
//4-如果你正在向下或向后射击，你可以放弃。如果需要，你可以忽略这一点。
如果（offset.x）这不完全是你想要的，但将是一个开始谢谢你的建议。我肯定我可以在某个地方使用它。这不完全是你想要的，但将是一个开始谢谢你的建议。我肯定我可以在某个地方使用它。谢谢你的所有帮助，太好了。谢谢你的所有帮助，太好了。