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App Inventor 2 图像矫正教程 - 透视变换与文档扫描 · App Inventor 2 中文网
...原始四角和目标四角
var srcPts = cv.matFromArray(4, 1, cv.CV_32FC2, [100,50, 350,30, 380,280, 80,300]);
var dstPts = cv.matFromArray(4, 1, cv.CV_32FC2, [0,0, 300,0, 300,400, 0,400]);
var M = cv.getPerspectiveTransform(srcPts, dstPts);
var dsize = new cv.Size(300, 400)...
How add context menu item to Windows Explorer for folders [closed]
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HKEY_CURRENT_USER\Software\Classes\*\shell if you are a normal user
In all cases:
add a new key under shell, naming it as you want to name the
context menu item
add a new key inside this key, named command (mandatory name)
edit the default property in command to
myprogrampath\path\path\executa...
rails 3.1.0 ActionView::Template::Error (application.css isn't precompiled)
...tion.rb
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config.assets.compile = true
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You can use this option to fallback to Sprockets when you are using precompiled assets but there are any missing precompiled files.
If config.assets.compile option is set to false and there are missing precompiled files you will get an "AssetNoPrecompi...
byte[] to hex string [duplicate]
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@Grungondola: It sounds strange that all other ways of converting bytes to a string would be so much slower. You weren't using += to concatenate the strings together, were you?
– Guffa
Nov 23 '15 at 22:29
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Difference between Math.Floor() and Math.Truncate()
...seems, simply because it can round to a specific number of decimal places. All the others round to zero decimals always. For example:
n = 3.145;
a = System.Math.Round (n, 2, MidpointRounding.ToEven); // 3.14
b = System.Math.Round (n, 2, MidpointRounding.AwayFromZero); // 3.15
With the other...
Can I change multiplier property for NSLayoutConstraint?
...them, since "Activating or deactivating the constraint calls addConstraint(_:) and removeConstraint(_:) on the view that is the closest common ancestor of the items managed by this constraint".
– qix
Jan 4 '17 at 5:26
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TemplateDoesNotExist - Django Error
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Make sure you have rest_framework listed in your settings.py INSTALLED_APPS.
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Application_Error not firing when customerrors = “On”
...the HandleErrorAttribute tells MVC to look for an Error view and it never calls the Application_Error() method. I couldn't find documentation of this but it is explained in this answer on programmers.stackexchange.com.
To get the ApplicationError() method called for every unhandled exception, simpl...
How to tell git to ignore individual lines, i.e. gitignore for specific lines of code [duplicate]
...o be filtered:
*.rb filter=gitignore, i.e. run filter named gitignore on all *.rb files
Define the gitignore filter in your gitconfig:
$ git config --global filter.gitignore.clean "sed '/#gitignore$/d'", i.e. delete these lines
$ git config --global filter.gitignore.smudge cat, i.e. do nothing ...
In Vim, is there a way to paste text in the search line?
I want to search for $maximumTotalAllowedAfterFinish and replace it with $minimumTotalAllowedAfterFinish . Instead of typing the long text:
...