cocoa - 当 SKSpriteNode 仅在屏幕上移动时，如何显示阴影或任何发光效果？

Question

我想在 SKSpriteNode 在屏幕上拖动时显示它的任何效果或动画。

我浏览了很多网站，但没有找到我的问题的相关答案。我对 SKSpriteNode 知之甚少。

谁能指导我解决这个问题。

谢谢。

Answer 1

使用工厂来制作阴影:

import SpriteKit

class MAKE {

    private static let view:SKView = SKView()

    static func makeShadow(from source: SKTexture, rgb: SKColor, a: CGFloat) -> SKSpriteNode {
        let shadowNode = SKSpriteNode(texture: source)
            shadowNode.colorBlendFactor = 0.5  // makes the following line more effective
            shadowNode.color = SKColor.gray // makes for a darker shadow. Off for "glow" shadow
        let textureSize = source.size()
        let doubleTextureSize = CGSize(width: textureSize.width * 2, height: textureSize.height * 2)
        let framer = SKSpriteNode(color: UIColor.clear, size: doubleTextureSize)
            framer.addChild(shadowNode)
        let filter = CIFilter(name: "CIGaussianBlur")
        let blurAmount = 10
        filter?.setValue(blurAmount, forKey: kCIInputRadiusKey)
        let effectsNode = SKEffectNode()
            effectsNode.filter = filter
            effectsNode.blendMode = .alpha
            effectsNode.addChild(framer)
            effectsNode.shouldRasterize = true
        let tex = view.texture(from: effectsNode)
        let shadow = SKSpriteNode(texture: tex)
            shadow.colorBlendFactor = 0.5
            shadow.color = rgb
            shadow.alpha = a
            shadow.zPosition = -1
    return shadow
    }
}

<小时/>

现在按照您喜欢的方式制作一个按钮，但请确保您创建了一个与您的按钮大小和形状完全相同的 buttonTexture，最好是它的灰色呈现。您需要将其发送到上面的模糊工厂 Shadowmaker，如下所示:

shadowSprite = MAKE.makeShadow(from: buttonTexture, rgb: myColor, a: 0.33)
        shadowSprite.position = CGPoint(x: self.frame.midX, y: self.frame.midY - 5)
        addChild(shadowSprite)

<小时/>

您可以在此处查看有关工厂运作方式和原因的更多详细信息: Create \(Use) SKView as \(in a) factory \(static class)