December 2022
Intermediate to advanced
208 pages
4h 44m
Japanese
Content preview from Python2年生 デスクトップアプリ開発のしくみ 体験してわかる！会話でまなべる！
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Chapter
5
144
画像を表示するアプリのレイアウト
画像を表示するアプリは、「ファイル選択ボタン（btn1）」 と「ファイル名を表示するテ
キスト（
txt）」 と「画像を表示するイメージ（img）」 で作ります。
ファイルを開く key="btn1"
key="img"
key="txt"
これをlayoutのリストにすると以下のようになります。
layout = [[sg.B(" ", k="btn1"), sg.T(k="txt")],
[sg.Im(k="img")]]
画像を表示するアプリを作る
まず、アプリ上に画像を表示させるしくみを考えよう。ただし、画像の
大きさはいろいろある。アプリより大きい画像の場合も考えられる。
大きすぎたらどうなるの？
アプリからはみ出すことになるね。だから、画像をアプリ内に収まる
ように縮小する必要がある。このとき便利なのが「
thumbnail()
」命
令だ。縦横比率を維持したまま縮小してくれるよ。
それは便利〜。
145
LESSON
19
画像を表示するアプリ
<>.thumbnail((<>,<>))
画像ファイルを読み込んで、
300
×
300
（ピクセル）以下の画像に縮
小しよう。
img = Image.open(loadname)
img.thumbnail((300,300)) ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.