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125
animation/types.go
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125
animation/types.go
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package animation
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import (
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"strings"
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)
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// AnimationType 表示动画类型
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type AnimationType string
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// 预定义动画类型常量
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const (
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Rotate AnimationType = "rotate" // 旋转动画
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Gradient AnimationType = "gradient" // 渐变动画
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Transform AnimationType = "transform" // 变换动画
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Fade AnimationType = "fade" // 淡入淡出动画
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Path AnimationType = "path" // 路径动画
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Color AnimationType = "color" // 颜色变换动画
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Bounce AnimationType = "bounce" // 弹跳动画
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Wave AnimationType = "wave" // 波浪动画
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Blink AnimationType = "blink" // 闪烁动画
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)
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// Animation 表示一个SVG动画接口
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type Animation interface {
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// GenerateSVG 生成动画的SVG代码
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GenerateSVG() string
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// GetTargetID 获取目标元素ID
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GetTargetID() string
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}
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// BaseAnimation 基础动画结构,包含所有动画共有的属性
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type BaseAnimation struct {
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Type AnimationType // 动画类型
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Duration float64 // 动画持续时间(秒)
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RepeatCount int // 重复次数,-1表示无限重复
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Delay float64 // 延迟时间(秒)
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TargetID string // 目标元素ID
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Attributes map[string]string // 动画属性
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}
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// GetTargetID 获取目标元素ID
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func (a *BaseAnimation) GetTargetID() string {
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return a.TargetID
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}
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// Manager 动画管理器,负责管理所有动画
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type Manager struct {
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animations []Animation
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}
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// GetAnimations 获取所有动画
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func (m *Manager) GetAnimations() []Animation {
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return m.animations
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}
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// NewAnimationManager 创建一个新的动画管理器
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func NewAnimationManager() *Manager {
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return &Manager{
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animations: make([]Animation, 0),
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}
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}
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// AddAnimation 添加一个动画
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func (m *Manager) AddAnimation(animation Animation) {
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m.animations = append(m.animations, animation)
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}
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// GenerateSVGAnimations 生成SVG动画代码
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func (m *Manager) GenerateSVGAnimations() string {
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if len(m.animations) == 0 {
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return ""
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}
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var sb strings.Builder
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// 添加SVG命名空间声明
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sb.WriteString("<defs>\n")
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// 用于存储需要放在defs中的定义
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var defsContent strings.Builder
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// 用于存储需要直接添加到SVG中的动画元素
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var animationsContent strings.Builder
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// 用于存储旋转动画的映射,键为目标元素ID
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rotateAnimations := make(map[string]string)
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// 处理所有动画
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for _, anim := range m.animations {
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svgCode := anim.GenerateSVG()
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if svgCode == "" {
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continue
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}
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// 根据动画类型决定放置位置
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switch a := anim.(type) {
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case *GradientAnimation:
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// 渐变定义需要放在defs中
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defsContent.WriteString(svgCode)
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case *RotateAnimation:
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// 旋转动画需要包裹目标元素,先存储起来
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// 提取animateTransform标签
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if start := strings.Index(svgCode, "<animateTransform"); start != -1 {
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if end := strings.Index(svgCode[start:], "/>"); end != -1 {
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rotateAnimations[a.GetTargetID()] = svgCode[start : start+end+2]
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}
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}
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default:
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// 其他动画元素直接添加到SVG中
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animationsContent.WriteString(svgCode)
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}
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}
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// 只有当存在需要放在defs中的内容时才添加defs标签
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if defsContent.Len() > 0 {
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sb.WriteString(defsContent.String())
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sb.WriteString("</defs>\n")
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} else {
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// 如果没有需要放在defs中的内容,则不添加defs标签
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sb.Reset()
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}
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// 添加直接放置的动画元素
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sb.WriteString(animationsContent.String())
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return sb.String()
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}
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