63 lines
1.5 KiB
Go
63 lines
1.5 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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// PathAnimation 路径动画
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type PathAnimation struct {
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BaseAnimation
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Path string // SVG路径数据
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Rotate string // 是否旋转元素以跟随路径方向 ("auto", "auto-reverse", 或 "0")
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}
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// NewPathAnimation 创建一个路径动画
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func NewPathAnimation(targetID string, path string, duration float64, repeatCount int) *PathAnimation {
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return &PathAnimation{
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BaseAnimation: BaseAnimation{
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Type: Path, // 路径动画类型
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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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Path: path,
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Rotate: "0", // 默认不旋转
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}
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}
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// WithRotate 设置是否旋转元素以跟随路径方向
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func (a *PathAnimation) WithRotate(rotate string) *PathAnimation {
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a.Rotate = rotate
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return a
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}
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// GenerateSVG 生成路径动画的SVG代码
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func (a *PathAnimation) GenerateSVG() string {
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var sb strings.Builder
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// 创建一个animateMotion元素
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sb.WriteString(fmt.Sprintf("<animateMotion href=\"#%s\" ", a.TargetID))
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sb.WriteString(fmt.Sprintf("path=\"%s\" ", a.Path))
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sb.WriteString(fmt.Sprintf("dur=\"%gs\" ", a.Duration))
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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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// 设置旋转属性
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sb.WriteString(fmt.Sprintf("rotate=\"%s\" ", a.Rotate))
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sb.WriteString("/>\n")
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return sb.String()
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}
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