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将 App Inventor 2 项目连接到外部传感器 · App Inventor 2 中文网
... port 13.
Ultrasonic sensors: port 36
Luminosity sensor: TwiMaster 1
In order to initialize all of the motors for use, the method “SetupMotors” must be called when the app starts and the screen is initialized. Here is an example of how simple the new blocks are to use:
Tutorials
A tutoria...
What are Vertex Array Objects?
...er the actions you did, such as activate this attribute, bind that buffer, etc. When you call glBindVertexArray( yourVAOId ), it simply replays those attribute pointer bindings and buffer bindings.
So your next call to draw uses whatever was bound by the VAO.
VAO's don't store vertex data. No. ...
How to make an array of arrays in Java
...onality (index-based lookup, sorting, uniqueness, FIFO-access, concurrency etc.).
While it's of course good and important to know about Arrays and their usage, in most cases using Collections makes APIs a lot more manageable (which is why new libraries like Google Guava hardly use Arrays at all).
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jQuery counting elements by class - what is the best way to implement this?
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Is there a difference between copy initialization and direct initialization?
...ed temporary. Any members of c1 that have pod-type (or members of members, etc., etc.) may not be initialized if the user supplied default constructors (if any) do not explicitly initialize them. For c2, it depends on whether there is a user supplied copy constructor and whether that appropriately i...
How to swap files between windows in VIM?
... an easy way, to swap those windows in places. Is there any Plugin, Macro, etc to make this more easy? BTW, I use MiniBufExplorer.
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How to get these two divs side-by-side?
..._div_1, #parent_div_2, #parent_div_3 {
width: 100px;
height: 100px;
border: 1px solid red;
margin-right: 10px;
float: left;
}
.child_div_1 {
float: left;
margin-right: 5px;
}
Check working example at http://jsfiddle.net/c6242/1/
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How can you use an object's property in a double-quoted string?
...e command's 1st token is a number, variable, statement keyword (if, while, etc), unary operator, {, etc... then the parsing mode is Expression otherwise Argument (up to a command terminator).
– Uber Kluger
Aug 7 at 3:30
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Where to get “UTF-8” string literal in Java?
... a Charsets class with static fields like Charsets.UTF_8, Charsets.UTF_16, etc.
Since Java 7 you should just use java.nio.charset.StandardCharsets instead for comparable constants.
Note that these constants aren't strings, they're actual Charset instances. All standard APIs that take a charset nam...