sprite-kit - Sprite 套件的方向键

Question

我有兴趣尝试创建一些游戏，即在新的 sprite 工具包中。但是，对于我心目中的游戏，我宁愿使用方向键而不是操纵杆。因为我将从 Cocos 搬过来，所以我的旧程序不再有效(所以那个 dpad 也不会)。可悲的是，我没有遇到任何可能有助于在新 Sprite 工具包中实现一个的教程(只有操纵杆)。我想知道并希望是否有人从 github 或其他东西或他们想要分享的有用链接中遇到一个简单的 dpad 类。谢谢

Answer 1

这是一种方法:

//Joystick node
- (SKSpriteNode *)controlPadNode
{
    SKSpriteNode *controlPadNode = [SKSpriteNode spriteNodeWithImageNamed:@"game-controller-front"];
    controlPadNode.position = CGPointMake(controlPadX,controlPadY);
    controlPadNode.name = @"controlPadNode";
    controlPadNode.zPosition = 1.0;
    return controlPadNode;
}

//handle touch events
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    CGPoint location = [touch locationInNode:self];
    SKNode *node = [self nodeAtPoint:location];

    //if control pad touched
    if ([node.name isEqualToString:@"controlPadNode"]) {
        touchX = location.x;
        touchY = location.y;
        controlButtonDown = true;
    }
}

//when touch moves
- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {

    UITouch *touch = [touches anyObject];
    CGPoint location = [touch locationInNode:self];
    SKNode *node = [self nodeAtPoint:location];

    //if control pad touched
    if ([node.name isEqualToString:@"controlPadNode"]) {
        touchX = location.x;
        touchY = location.y;
        controlButtonDown = true;
    }
}

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

    UITouch *touch = [touches anyObject];
    CGPoint location = [touch locationInNode:self];
    SKNode *node = [self nodeAtPoint:location];

    //if control pad touched
    if ([node.name isEqualToString:@"controlPadNode"]) {
        controlButtonDown = false;
    }
}

//update method
-(void)update:(NSTimeInterval)currentTime {

    if (controlButtonDown) {

        //the control pad
        SKNode *controlNode = [self childNodeWithName:@"controlPadNode"];

        //the node you want to move
        SKNode *node = [self childNodeWithName:@"spaceShipNode"];

        //compute the angle between parameters pad and the horizontal
        float angle = atan2f (touchY - controlPadY, touchX - controlPadX) ;

        //move the control pad for the player to have a sense of movement
        SKAction *moveControlPad = [SKAction moveTo:CGPointMake(touchX, touchY) duration:0.00001];
        double distance = sqrt(pow((touchX - controlPadX), 2.0) + pow((touchY - controlPadY), 2.0));

        //make sure the control pad only moves 40 pixels
        if( distance < 40 ){
            [controlNode runAction:moveControlPad];
        }

        //move the ship
        SKAction *moveShip = [SKAction moveByX: 6*cosf(angle) y:6*sinf(angle) duration:0.005];
        [node runAction: moveShip];        

    }
}

编辑:

也可以使用它在触摸结束时将控制板移回:

if (!controlButtonDown) {
    SKNode *controlNode = [self childNodeWithName:@"controlPadNode"];
    SKAction *moveControlPad = [SKAction moveTo:CGPointMake(controlPadX, controlPadY) duration:0.00001];
    [controlNode runAction:moveControlPad];
}