Question

我的情节代码如下

 Widget build(BuildContext context) {
    return Container(
      child: Scaffold(
        backgroundColor: AppTheme.getTheme().backgroundColor,
        body:Column(
          children: <Widget>[
            SizedBox(
              height: MediaQuery.of(context).padding.top,
            ),
            Expanded(
              child: PageView(
                controller: pageController,
                pageSnapping: true,
                onPageChanged: (index) {
                  currentShowIndex = index;
                },
                scrollDirection: Axis.horizontal,
                children: <Widget>[
                  PagePopup(imageData: pageViewModelData[0]),
                  PagePopup(imageData: pageViewModelData[1]),
                  PagePopup(imageData: pageViewModelData[2]),
                ],
              ),
            ),
            PageIndicator(
              layout: PageIndicatorLayout.WARM,
              size: 10.0,
              controller: pageController,
              space: 5.0,
              count: 3,
              color: AppTheme.getTheme().dividerColor,
              activeColor: AppTheme.getTheme().primaryColor,
            ),
            Padding(
              padding: const EdgeInsets.only(left: 48, right: 48, bottom: 8, top: 32),
              child: Container(
                height: 48,
                decoration: BoxDecoration(
                  color: AppTheme.getTheme().primaryColor,
                  borderRadius: BorderRadius.all(Radius.circular(24.0)),
                  boxShadow: <BoxShadow>[
                    BoxShadow(
                      color: AppTheme.getTheme().dividerColor,
                      blurRadius: 8,
                      offset: Offset(4, 4),
                    ),
                  ],
                ),
                child: Material(
                  color: Colors.transparent,
                  child: InkWell(
                    borderRadius: BorderRadius.all(Radius.circular(24.0)),
                    highlightColor: Colors.transparent,
                    onTap: () {
                      Navigator.push(
                        context,
                        MaterialPageRoute(builder: (context) => LoginScreen()),
                      );
                    },

df1，df2和df3具有相同的以下结构


ggplot(NULL, aes(V2, V1)) + 
  geom_line(data = df1, colour = "blue") +
  geom_line(data = df2, colour = "green") +
  geom_line(data = df3, colour = "purple") +
  theme(
    legend.position = "bottom") +

输出未显示图例，但我需要区分情节上的线条。

。我只需要在这里有传说。

Answer 1

如果将数据放入一个数据框，然后使用一个geom_line而不是多个library(ggplot2) dplyr::bind_rows(df1 = df1, df2 = df2, df3 = df3, .id = "id") %>% ggplot() + aes(V2, V1, color = id) + geom_line() + theme(legend.position = "bottom")绘制数据，则可能会有所帮助。

df1 <- structure(list(V2 = 1:10, V1 = c(1.4, 1.5, 1.9, 4.5, 6.7, 7.8, 
8.1, 8.2, 8.3, 8.9)), class = "data.frame", row.names = c(NA, -10L))

df2 <- structure(list(V2 = 1:10, V1 = c(1.43390152077191, 2.30610947613604, 
2.23775280718692, 5.41628585802391, 7.05710641788319, 8.77536501311697, 
8.48437852263451, 8.68867353517562, 8.7907762312796, 8.91225462416187
)), row.names = c(NA, -10L), class = "data.frame")

df3 <- structure(list(V2 = 1:10, V1 = c(2.04147320063785, 2.01257497165352, 
2.22035211822949, 5.08143315766938, 7.31734440829605, 8.23827453767881, 
8.27036898061633, 8.91508049662225, 9.04778654868715, 9.74391470812261
)), row.names = c(NA, -10L), class = "data.frame")

数据

ctx,cancel:=context.WithCancel(context.Background())
go  func(ctx context.Context) {
   for {
      select {
         case <-ctx.Done():
           return 
         default
       }
       // Do stuff
     }
}(ctx) 
...
// Tell that goroutine to stop
cancel()

ggplot图例不出现

1 个答案: