Question

我想使图像高度不相等，并在调整大小时保持布局不变，而又不改变图像的长宽比，这是我想做的： https://i.ibb.co/nkSXJ4f/Screen-Shot-2019-04-12-at-6-32-32-AM.png

我知道使用CSS网格很容易，但是我认为我可以使代码更简单，因为布局并不复杂

我尝试过的

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <EditText
        android:id="@+id/search_edit_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="Enter your search"
        android:imeOptions="actionSearch"
        android:inputType="text" />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/search_edit_text" />

    <ProgressBar
        android:id="@+id/progress_bar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:visibility="gone" />

</RelativeLayout>

from numpy import nan, ndarray, ones_like, vstack, random
from numpy.lib.stride_tricks import as_strided
from numpy.linalg import pinv
from pandas import DataFrame, date_range

def calc_beta(s: ndarray, m: ndarray):
  x = vstack((ones_like(m), m))
  b = pinv(x.dot(x.T)).dot(x).dot(s)
  return b[1]

def rolling_calc_beta(s_df: DataFrame, m_df: DataFrame, period: int):
  result = ndarray(shape=s_df.shape, dtype=float)
  l, w = s_df.shape
  ls, ws = s_df.values.strides
  result[0:period - 1, :] = nan
  s_arr = as_strided(s_df.values, shape=(l - period + 1, period, w), strides=(ls, ls, ws))
  m_arr = as_strided(m_df.values, shape=(l - period + 1, period), strides=(ls, ls))
  for row in range(period, l):
    result[row, :] = calc_beta(s_arr[row - period, :], m_arr[row - period])
  return DataFrame(data=result, index=s_df.index, columns=s_df.columns)

if __name__ == '__main__':
  num_sec_dfs, num_periods = 4000, 480

  dates = date_range('1995-12-31', periods=num_periods, freq='M', name='Date')
  stocks = DataFrame(data=random.rand(num_periods, num_sec_dfs), index=dates,
                   columns=['s{:04d}'.format(i) for i in 
                            range(num_sec_dfs)]).pct_change()
  market = DataFrame(data=random.rand(num_periods), index=dates, columns= 
              ['Market']).pct_change()
  betas = rolling_calc_beta(stocks, market, 12)

Answer 1

尝试使用此代码

body {
  height: 100%;
}
*{
	box-sizing:border-box;
}

.card {
  margin-right: 20px;
  vertical-align: top;
  height:100vh;
  display: block;
  overflow: hidden;
}

.medium {
  width: 65%;
  margin-right: 5%;
    float:left
}

.small {
  width: 25%;
  float:left
}
.card-image { height:100%; }

.card-image img {
   width: 100%;
    height: 100%;
    object-fit: cover;
}

<main class="grid">
  <a href="" class="card medium">
    <figcaption class="caption">project title</figcaption>
    <div class="card-image">
      <img src="https://images.unsplash.com/photo-1554565166-cafee0896506?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=934&q=80" alt="">
    </div>
  </a>

  <a href="" class="card small">
    <figcaption class="caption">Kettle</figcaption>
    <div class="card-image">
      <img src="https://images.unsplash.com/photo-1554565166-cafee0896506?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=934&q=80" alt="">
    </div>
  </a>
</main>

div高度不相等

1 个答案: