用多个geom_step将图例添加到ggplot中最好的方法是什么？

library(ggplot2)

# 创建一个空的aes()映射
p <- ggplot() + aes()

# 添加多个geom_step图层，并设置颜色和图例标签
p <- p + geom_step(data = data1, aes(x = x1, y = y1, color = "Data 1"))
p <- p + geom_step(data = data2, aes(x = x2, y = y2, color = "Data 2"))
p <- p + geom_step(data = data3, aes(x = x3, y = y3, color = "Data 3"))

# 手动设置颜色和图例标签
p <- p + scale_color_manual(values = c("Data 1" = "red", "Data 2" = "blue", "Data 3" = "green"),
                            labels = c("Data 1", "Data 2", "Data 3"))

# 显示图形
print(p)