106 lines
2.8 KiB
Go
106 lines
2.8 KiB
Go
package animation
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import (
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"fmt"
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"strings"
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)
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// BounceAnimation 弹跳动画
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type BounceAnimation struct {
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BaseAnimation
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Property string // 要变换的属性（如 y, transform 等）
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From string // 起始值
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To string // 结束值
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BounceCount int // 弹跳次数
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}
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// NewBounceAnimation 创建一个弹跳动画
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func NewBounceAnimation(targetID string, property string, from, to string, bounceCount int, duration float64, repeatCount int) *BounceAnimation {
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return &BounceAnimation{
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BaseAnimation: BaseAnimation{
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Type: Bounce, // 弹跳动画类型
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Duration: duration,
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RepeatCount: repeatCount,
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Delay: 0,
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TargetID: targetID,
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Attributes: make(map[string]string),
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},
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Property: property,
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From: from,
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To: to,
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BounceCount: bounceCount,
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}
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}
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// GenerateSVG 生成弹跳动画的SVG代码
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func (a *BounceAnimation) GenerateSVG() string {
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var sb strings.Builder
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// 创建animateTransform元素，使用transform属性
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if a.Property == "transform" {
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sb.WriteString(fmt.Sprintf("<animateTransform href=\"#%s\" attributeName=\"transform\" type=\"translate\" ", a.TargetID))
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sb.WriteString(fmt.Sprintf("from=\"%s\" to=\"%s\" ", a.From, a.To))
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} else {
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sb.WriteString(fmt.Sprintf("<animate href=\"#%s\" attributeName=\"%s\" ", a.TargetID, a.Property))
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sb.WriteString(fmt.Sprintf("from=\"%s\" to=\"%s\" ", a.From, a.To))
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}
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sb.WriteString(fmt.Sprintf("dur=\"%gs\" ", a.Duration))
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// 生成弹跳效果的关键帧
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var keyTimes, values []string
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step := 1.0 / float64(a.BounceCount*2)
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for i := 0; i <= a.BounceCount*2; i++ {
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// 调整关键帧时间，使动画更加平滑
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keyTime := float64(i) * step
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// 为每个弹跳周期添加额外的中间帧
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if i > 0 && i < a.BounceCount*2 {
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keyTime = keyTime + (step * 0.1) // 稍微延长每次弹跳的时间
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}
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keyTimes = append(keyTimes, fmt.Sprintf("%.3f", keyTime))
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if i%2 == 0 {
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values = append(values, a.From)
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} else {
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values = append(values, a.To)
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}
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}
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// 添加关键帧属性
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sb.WriteString(fmt.Sprintf("values=\"%s\" ", strings.Join(values, ";")))
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sb.WriteString(fmt.Sprintf("keyTimes=\"%s\" ", strings.Join(keyTimes, ";")))
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// 添加缓动函数
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sb.WriteString("calcMode=\"spline\" ")
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sb.WriteString("keySplines=\"")
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for i := 0; i < len(values)-1; i++ {
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if i > 0 {
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sb.WriteString(";")
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}
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if i%2 == 0 {
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// 快速上升
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sb.WriteString("0.2 0 0.8 1")
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} else {
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// 缓慢下落
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sb.WriteString("0.2 0.8 0.8 1")
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}
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}
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sb.WriteString("\" ")
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if a.RepeatCount < 0 {
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sb.WriteString("repeatCount=\"indefinite\" ")
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} else if a.RepeatCount > 0 {
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sb.WriteString(fmt.Sprintf("repeatCount=\"%d\" ", a.RepeatCount))
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}
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if a.Delay > 0 {
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sb.WriteString(fmt.Sprintf("begin=\"%gs\" ", a.Delay))
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}
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// 添加fill属性
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sb.WriteString("fill=\"freeze\" />")
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return sb.String()
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}
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