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App Inventor 2 拖拽物体教程 - 按住移动与碰撞检测 · App Inventor 2 中文网
...Y, prevX, prevY, currentX, currentY, draggedAnySprite) {
if 正在拖拽 and draggedAnySprite {
图像精灵1.X = currentX - 偏移X
图像精灵1.Y = currentY - 偏移Y
}
}
when 画布1.TouchUp(x, y) {
正在拖拽 = false
}
碰撞检测
Sprite与S...
is not JSON serializable
...
simplejson and json don't work with django objects well.
Django's built-in serializers can only serialize querysets filled with django objects:
data = serializers.serialize('json', self.get_queryset())
return HttpResponse(data, conten...
How to re-open an issue in github?
...I change it to open again ?
I read somewhere that I need rights for push and pull operation. Is that true ?
2 Answers
...
Reading my own Jar's Manifest
...
You can do one of two things:
Call getResources() and iterate through the returned collection of URLs, reading them as manifests until you find yours:
Enumeration<URL> resources = getClass().getClassLoader()
.getResources("META-INF/MANIFEST.MF");
while (resources.ha...
JVM option -Xss - What does it do exactly?
...thread stack size", what does it mean exactly? Could anyone help me understand this?
4 Answers
...
Make Vim show ALL white spaces as a character
...ething else, is then, really, a plain old whitespace.
As usual, to understand how listchars works, use the help. It provides great information about what chars can be displayed (like trailing space, for instance) and how to do it:
:help listchars
It might be helpful to add a toggle to it so you ...
Ternary operator (?:) in Bash
...
why the [[ and ]] ? it works just as well like this : [ $b = 5 ] && a="$c" || a="$d"
– kdubs
Oct 29 '14 at 14:57
...
What is the purpose of static keyword in array parameter of function like “char s[static 10]”?
...or example, it also means that someArray is never NULL.
Note that the C Standard does not require the compiler to diagnose when a call to the function does not meet these requirements (i.e., it is silent undefined behaviour).
The second declaration simply declares someArray (not someArray's elemen...
Scroll back to the top of scrollable div
... edited Jan 6 '15 at 4:31
andrewb
4,80266 gold badges3030 silver badges5151 bronze badges
answered May 24 '12 at 19:50
...
Refresh a page using PHP
...an do it with PHP:
header("Refresh:0");
It refreshes your current page, and if you need to redirect it to another page, use following:
header("Refresh:0; url=page2.php");
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