Question

提前感谢任何人都能给予的帮助。

作为一名初学者并且具有较弱的几何技能，我发现自己存在以下问题。

我试图拥有一艘＆＃34;船＆＃34;由以内容速度在屏幕上移动的用户操纵。无论船舶指向什么方向，它的方向都是移动的（就像游戏中的15枚硬币一样）。用户可以触摸屏幕的右半部分以顺时针旋转船舶，或者向左旋转船舶逆时针旋转。如果你按住船继续旋转。

船正确旋转。然而，它移动的方向并不是我所期望的。每当我触摸屏幕的右侧或左侧（在模拟器中）时，船舶将改变其在45-180度之间移动的方向。我无法确定它的模式。我花了一天的时间没有成功地记录价值并试图在纸上进行数学计算。我哪里错了？

触摸通过以下touchesBegan和touchesEned代码处理并且似乎正确发生：

static const int dontRotate             = 0;
static const int rotateClockwise        = 1;
static const int rotateCounterClockwise = 2;


- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [touches anyObject];
    CGPoint touchLocation = [touch locationInNode:self.scene];

    if(touchLocation.x > screenWidth/2){
        shipRotation = rotateClockwise;
    }

    if(touchLocation.x <= screenWidth/2){
        shipRotation = rotateCounterClockwise;
    }
}


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

    shipRotation = dontRotate;
}

我在更新中更新了船舶的旋转，方向和位置：

#define SK_DEGREES_TO_RADIANS(__ANGLE__) ((__ANGLE__) * 0.01745329252f)
#define SK_RADIANS_TO_DEGREES(__ANGLE__) ((__ANGLE__) * 57.29577951f)


-(void)update:(CFTimeInterval)currentTime {

        [self enumerateChildNodesWithName:@"player" usingBlock:^(SKNode *node, BOOL *stop) {

            shipOffsetAngle = shipDirection + SK_DEGREES_TO_RADIANS(90);
            shipLocation.x = shipLocation.x + speed * cos(SK_RADIANS_TO_DEGREES(shipOffsetAngle));
            shipLocation.y = shipLocation.y + speed * sin(SK_RADIANS_TO_DEGREES(shipOffsetAngle));

            node.position = shipLocation;

            if (shipRotation == rotateClockwise) {
                shipDirection = shipDirection - 0.01;
                node.zRotation = shipDirection;
            }

            if (shipRotation == rotateCounterClockwise) {
                shipDirection = shipDirection + 0.01;
                node.zRotation = shipDirection;
            }
        }];
}

正如@ LearnCocos2D所建议的，我也尝试了内置的GLKit转换，但得到了相同的结果。

    test1 = SK_DEGREES_TO_RADIANS(90);
    test2 = 90 * (M_PI / 180);
    test3 = GLKMathDegreesToRadians(90);

    NSLog(@"test1 = %f", test1);
    NSLog(@"test2 = %f", test2);
    NSLog(@"test3 = %f", test3);

全部注销为1.570796

经过大量的忙碌后，我发现了自己的错误。下面，在第一行中，shipoffsetAngle以弧度为单位。在接下来的两条sin / cos线中，它尝试使用我设置的SK_DEGREES_TO_RADIANS将其乘以0.01745329252将其转换为弧度。

            shipOffsetAngle = shipDirection + SK_DEGREES_TO_RADIANS(90);
            shipLocation.x = shipLocation.x + speed * cos(SK_RADIANS_TO_DEGREES(shipOffsetAngle));
            shipLocation.y = shipLocation.y + speed * sin(SK_RADIANS_TO_DEGREES(shipOffsetAngle));

下面，我刚拿出来并切换到GLKit中的GLKMathDegreesToRadians，现在一切正常。

    shipOffsetAngle = shipDirection + GLKMathDegreesToRadians(90);
    shipLocation.x = shipLocation.x + speed * cos(shipOffsetAngle);
    shipLocation.y = shipLocation.y + speed * sin(shipOffsetAngle);

通过改变角度以恒定速度移动SKSpriteNode

0 个答案: