🎉 Initial commit

animation/gradient.go

@@ -0,0 +1,73 @@
+package animation
+
+import (
+	"fmt"
+	"strings"
+)
+
+// GradientAnimation 渐变动画
+type GradientAnimation struct {
+	BaseAnimation
+	Colors  []string // 渐变颜色列表
+	Animate bool     // 是否添加动画效果
+}
+
+// NewGradientAnimation 创建一个渐变动画
+func NewGradientAnimation(targetID string, colors []string, duration float64, repeatCount int, animate bool) *GradientAnimation {
+	return &GradientAnimation{
+		BaseAnimation: BaseAnimation{
+			Type:        Gradient,
+			Duration:    duration,
+			RepeatCount: repeatCount,
+			Delay:       0,
+			TargetID:    targetID,
+			Attributes:  make(map[string]string),
+		},
+		Colors:  colors,
+		Animate: animate,
+	}
+}
+
+// GenerateSVG 生成渐变动画的SVG代码
+func (a *GradientAnimation) GenerateSVG() string {
+	var sb strings.Builder
+
+	// 创建渐变定义
+	gradientID := fmt.Sprintf("%s-gradient", a.TargetID)
+	sb.WriteString(fmt.Sprintf("<linearGradient id=\"%s\" x1=\"0%%\" y1=\"0%%\" x2=\"100%%\" y2=\"0%%\">\n", gradientID))
+
+	// 添加渐变颜色
+	for i, color := range a.Colors {
+		offset := float64(i) / float64(len(a.Colors)-1) * 100
+		sb.WriteString(fmt.Sprintf("  <stop offset=\"%g%%\" stop-color=\"%s\" />\n", offset, color))
+	}
+	sb.WriteString("</linearGradient>\n")
+
+	// 为目标元素添加样式引用
+	sb.WriteString(fmt.Sprintf("<style type=\"text/css\">\n  #%s { fill: url(#%s) !important; }\n</style>\n", a.TargetID, gradientID))
+
+	// 添加动画
+	if a.Animate {
+		// x1 动画
+		sb.WriteString(fmt.Sprintf("<animate href=\"#%s\" attributeName=\"x1\" from=\"0%%\" to=\"100%%\" ", gradientID))
+		sb.WriteString(fmt.Sprintf("dur=\"%gs\" ", a.Duration))
+		if a.RepeatCount < 0 {
+			sb.WriteString("repeatCount=\"indefinite\" ")
+		} else if a.RepeatCount > 0 {
+			sb.WriteString(fmt.Sprintf("repeatCount=\"%d\" ", a.RepeatCount))
+		}
+		sb.WriteString("/>\n")
+
+		// x2 动画
+		sb.WriteString(fmt.Sprintf("<animate href=\"#%s\" attributeName=\"x2\" from=\"100%%\" to=\"200%%\" ", gradientID))
+		sb.WriteString(fmt.Sprintf("dur=\"%gs\" ", a.Duration))
+		if a.RepeatCount < 0 {
+			sb.WriteString("repeatCount=\"indefinite\" ")
+		} else if a.RepeatCount > 0 {
+			sb.WriteString(fmt.Sprintf("repeatCount=\"%d\" ", a.RepeatCount))
+		}
+		sb.WriteString("/>\n")
+	}
+
+	return sb.String()
+}