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61
animation/rotate.go
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61
animation/rotate.go
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package animation
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import (
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"fmt"
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)
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// RotateAnimation 旋转动画
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type RotateAnimation struct {
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BaseAnimation
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FromAngle float64 // 起始角度
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ToAngle float64 // 结束角度
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CenterX float64 // 旋转中心X坐标
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CenterY float64 // 旋转中心Y坐标
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}
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// NewRotateAnimation 创建一个旋转动画
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func NewRotateAnimation(targetID string, fromAngle, toAngle float64, duration float64, repeatCount int) *RotateAnimation {
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return &RotateAnimation{
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BaseAnimation: BaseAnimation{
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Type: Rotate,
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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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FromAngle: fromAngle,
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ToAngle: toAngle,
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CenterX: 0,
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CenterY: 0,
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}
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}
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// GenerateSVG 生成旋转动画的SVG代码
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func (a *RotateAnimation) GenerateSVG() string {
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// 创建一个带有transform-box和transform-origin样式的g元素
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// 这个g元素将包裹目标元素及其相关元素
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svg := fmt.Sprintf("<g style=\"transform-box: fill-box; transform-origin: center;\">\n")
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// 这里只添加animateTransform元素
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svg += fmt.Sprintf(" <animateTransform attributeName=\"transform\" attributeType=\"XML\" type=\"rotate\" ")
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// 不再需要指定中心点坐标,直接使用角度值
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svg += fmt.Sprintf("from=\"%g\" to=\"%g\" ", a.FromAngle, a.ToAngle)
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svg += fmt.Sprintf("dur=\"%gs\" ", a.Duration)
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if a.RepeatCount < 0 {
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svg += "repeatCount=\"indefinite\" "
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} else if a.RepeatCount > 0 {
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svg += fmt.Sprintf("repeatCount=\"%d\" ", a.RepeatCount)
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}
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if a.Delay > 0 {
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svg += fmt.Sprintf("begin=\"%gs\" ", a.Delay)
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}
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svg += "additive=\"sum\" />\n"
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svg += "</g>\n"
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return svg
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}
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