2018年12月21日 星期五
python 開源項目列表
2018年11月17日 星期六
Markdown on Google blogger
<script src="https://cdnjs.cloudflare.com/ajax/libs/showdown/1.6.4/showdown.min.js">
</script>
<script>
// The > will replaced to > when using innerHTML, so replace it back to >
// for showdown to render blockquote
function blockquote(str) {
return str.replace(/\n>/g,'\n>') ;
}
var converter = new showdown.Converter();
var posts = document.querySelectorAll(".post-body");
var s = "";
Array.prototype.forEach.call(posts, function(el, i) {
var idx = el.innerHTML.indexOf("markdown");
if(idx != -1 && idx <= 1) {
el.innerHTML = converter.makeHtml(blockquote(el.innerHTML).replace("markdown",""));
var pres = el.querySelectorAll("pre");
for (var i = 0; i < pres.length; i++) {
pres[i].classList.add("prettyprint");
pres[i].classList.add("linenums:1");
}
}
});
</script>
<script src="https://cdn.rawgit.com/google/code-prettify/master/loader/run_prettify.js">
</script>
程式相當簡單，不言自明，接著在寫 blog 時只需要注意兩件事
* 在要用 markdown 編寫的文章最開頭放一行 markdown 字串讓 script 知道這一篇文章是用 markdown 寫的，需要做轉換
* 編寫文章時要用 HTML 的模式編寫
上面的程式碼區塊除了 markdown 的轉換之外，也引用了 Google 的 prettify 函式庫來做程式碼的上色
關於程式碼上色的寫法其實跟用 markdwon 之前完全一樣，markdown 有一個好處是他跟 html 相容，你可以直接在 markdown 文件中寫 html 內容，markdown 轉換時不會去動到 html 內容的東西
比較可惜的是若程式碼內有用到角括號，還是要先將角括號轉換成 < 和 > 才能將角括號與角括號內的文字正確顯示出來
若是沒有用 < > 這類跳脫字元直接用 < > 的話，在使用 innerHTML 會被當成是 html tag 並且將角括號內的文字轉成小寫，因為 html 先天就是 case insensitive，各家瀏覽器實作時都將 innerHTML 中的 tag name 轉為小寫
這篇文章就是用 markdown 寫的，使用的感想是寫文時真的舒服多了，markdown 的一個最大優點是它很純粹，很乾淨，沒有要做的包山包海複雜化而是用一些簡單的符號做出連結、標題、段落等效果，寫 blog 其實就只需要這些功能而已，如果真的 markdown 有做不到的部分，大不了直接寫 html 在裡面就好了
2018年10月3日 星期三
Screenlighter Privacy Policy
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2018年9月24日 星期一
python 2.7 exception message 無法印出中文
could not open port '123': WindowsError(2, '\xa8t\xb2\xce\xa7\xe4\xa4\xa3\xa8\xec\xab\xfc\xa9w\xaa\xba\xc0\xc9\xae\xd7\xa1C')
Google 找了很多資料，有講到用 CP950 decode 的，還有其他一些 decode 方式，不過試過後都沒用，有可能是因為網路上的範例所用的字串中還是 binary 的 data，而我遇到的情況是中文已經被轉為 \xa8t 這樣的 ASCII 字元了，所以需要找的解法應該是可以將 ASCII code 轉為 binary data 的方案
最後發現，用 "string_escape" decode 就可以達成
str(e).decode('string_escape')
string_escape 的用途是把遇到 \x 後面的字串轉為 binary 的 data，而其他一般的字串就不作更動，所以只要把 exception message 整串丟給它，就會幫你轉好了，非常方便
2018年9月11日 星期二
Android vector drawable resize
因為 vector drawable 以 xml 的形式並且以 path 屬性描述圖案，所以要改變它的大小不是那麼容易，這時可以用 group 屬性來將圖案作縮小或放大
group 屬性原本是用來讓 xml 內的多個 path 包在一起讓想修改的效果同時作用在多個 path 上，但當然只有一個 path 的話也是可以用的，而 group 屬性提供的其中一種效果就是可以設定圖案的放大或縮小
可以看到 Android 官網上的說明，主要就是 pivotX、pivotY、scaleX、scaleY 這四個屬性可以作到放大縮小的效果
scale 屬性就是指定圖案要縮放的倍數，例如設為 2 就是放大為兩倍，設為 0.5 就是縮小一倍，pivot 屬性就是設定縮放的基準點位置在哪，這個會跟 drawable 的 viewportHeight 跟 viewportWidth 相關連，例如 viewportWidth 設定為 24，那 pivotX 通常會設為 12，也就是從中心點開始對圖案作縮放，例如下面的例子，就是將圖案縮小一倍
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="48dp"
android:height="48dp"
android:alpha="0.6"
android:viewportHeight="24.0"
android:viewportWidth="24.0">
<group
android:scaleX="0.5"
android:scaleY="0.5"
android:pivotX="12"
android:pivotY="12">
<path
android:fillColor="#FF000000"
android:pathData="M3,4L3,1h2v3h3v2L5,6v3L3,9L3,6L0,6L0,4h3zM6,10L6,7h3L9,
4h7l1.83,2L21,6c1.1,0 2,0.9 2,2v12c0,1.1 -0.9,2 -2,2L5,22c-1.1,0 -2,-0.9 -2,-2L3,10h3zM13,
19c2.76,0 5,-2.24 5,-5s-2.24,-5 -5,-5 -5,2.24 -5,5 2.24,5 5,5zM9.8,14c0,1.77 1.43,3.2 3.2,
3.2s3.2,-1.43 3.2,-3.2 -1.43,-3.2 -3.2,-3.2 -3.2,1.43 -3.2,3.2z"/>
</group>
</vector>
2018年8月24日 星期五
RSSI and Sensitivity
RSSI
RSSI 是 Received signal strength indication 的縮寫，直翻叫做接收訊號強度指標，這表示裝置收到的訊號強度，用來表示目前的訊號連接品質，這個值是越大越好，越大表示目前訊號品質越優