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106 lines
3.7 KiB
Swift
106 lines
3.7 KiB
Swift
//
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// Transform.swift
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// lottie-swift
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//
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// Created by Brandon Withrow on 1/7/19.
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//
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import Foundation
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/// The animatable transform for a layer. Controls position, rotation, scale, and opacity.
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final class Transform: Codable {
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/// The anchor point of the transform.
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let anchorPoint: KeyframeGroup<Vector3D>
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/// The position of the transform. This is nil if the position data was split.
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let position: KeyframeGroup<Vector3D>?
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/// The positionX of the transform. This is nil if the position property is set.
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let positionX: KeyframeGroup<Vector1D>?
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/// The positionY of the transform. This is nil if the position property is set.
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let positionY: KeyframeGroup<Vector1D>?
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/// The scale of the transform
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let scale: KeyframeGroup<Vector3D>
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/// The rotation of the transform. Note: This is single dimensional rotation.
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let rotation: KeyframeGroup<Vector1D>
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/// The opacity of the transform.
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let opacity: KeyframeGroup<Vector1D>
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/// Should always be nil.
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let rotationZ: KeyframeGroup<Vector1D>?
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enum CodingKeys : String, CodingKey {
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case anchorPoint = "a"
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case position = "p"
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case positionX = "px"
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case positionY = "py"
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case scale = "s"
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case rotation = "r"
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case rotationZ = "rz"
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case opacity = "o"
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}
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enum PositionCodingKeys : String, CodingKey {
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case split = "s"
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case positionX = "x"
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case positionY = "y"
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}
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required init(from decoder: Decoder) throws {
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/**
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This manual override of decode is required because we want to throw an error
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in the case that there is not position data.
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*/
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let container = try decoder.container(keyedBy: Transform.CodingKeys.self)
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// AnchorPoint
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self.anchorPoint = try container.decodeIfPresent(KeyframeGroup<Vector3D>.self, forKey: .anchorPoint) ?? KeyframeGroup(Vector3D(x: Double(0), y: 0, z: 0))
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// Position
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if container.contains(.positionX), container.contains(.positionY) {
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// Position dimensions are split into two keyframe groups
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self.positionX = try container.decode(KeyframeGroup<Vector1D>.self, forKey: .positionX)
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self.positionY = try container.decode(KeyframeGroup<Vector1D>.self, forKey: .positionY)
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self.position = nil
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} else if let positionKeyframes = try? container.decode(KeyframeGroup<Vector3D>.self, forKey: .position) {
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// Position dimensions are a single keyframe group.
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self.position = positionKeyframes
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self.positionX = nil
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self.positionY = nil
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} else if let positionContainer = try? container.nestedContainer(keyedBy: PositionCodingKeys.self, forKey: .position),
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let positionX = try? positionContainer.decode(KeyframeGroup<Vector1D>.self, forKey: .positionX),
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let positionY = try? positionContainer.decode(KeyframeGroup<Vector1D>.self, forKey: .positionY) {
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/// Position keyframes are split and nested.
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self.positionX = positionX
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self.positionY = positionY
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self.position = nil
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} else {
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/// Default value.
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self.position = KeyframeGroup(Vector3D(x: Double(0), y: 0, z: 0))
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self.positionX = nil
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self.positionY = nil
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}
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// Scale
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self.scale = try container.decodeIfPresent(KeyframeGroup<Vector3D>.self, forKey: .scale) ?? KeyframeGroup(Vector3D(x: Double(100), y: 100, z: 100))
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// Rotation
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if let rotationZ = try container.decodeIfPresent(KeyframeGroup<Vector1D>.self, forKey: .rotationZ) {
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self.rotation = rotationZ
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} else {
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self.rotation = try container.decodeIfPresent(KeyframeGroup<Vector1D>.self, forKey: .rotation) ?? KeyframeGroup(Vector1D(0))
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}
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self.rotationZ = nil
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// Opacity
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self.opacity = try container.decodeIfPresent(KeyframeGroup<Vector1D>.self, forKey: .opacity) ?? KeyframeGroup(Vector1D(100))
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}
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}
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