Tutorial by Examples: ar

Use the Separating Axis Theorem to determine if 2 convex polygons are intersecting THE POLYGONS MUST BE CONVEX Attribution: Markus Jarderot @ How to check intersection between 2 rotated rectangles? // polygon objects are an array of vertices forming the polygon // var polygon1=[{x:100,y:100}...

Tests all polygon sides for intersections to determine if 2 polygons are colliding. // polygon objects are an array of vertices forming the polygon // var polygon1=[{x:100,y:100},{x:150,y:150},{x:50,y:150},...]; // The polygons can be both concave and convex // return true if the 2 polygons ...

Tests if the [x,y] point is inside a closed arc. var arc={ cx:150, cy:150, innerRadius:75, outerRadius:100, startAngle:0, endAngle:Math.PI } function isPointInArc(x,y,arc){ var dx=x-arc.cx; var dy=y-arc.cy; var dxy=dx*dx+dy*dy; var rrOuter=arc.outerRadiu...

Tests if an [x,y] point is inside a rectangle. // rectangle objects: {x:, y:, width:, height: } // var rect={x:10, y:15, width:25, height:20} // Return true if the x,y point is inside the rectangle function isPointInRectangle(x,y,rect){ return(x>rect.x && x<rect.x+rect.width...

1..100 | ForEach-Object { Write-Progress -Activity "Copying files" -Status "$_ %" -Id 1 -PercentComplete $_ -CurrentOperation "Copying file file_name_$_.txt" Start-Sleep -Milliseconds 500 # sleep simulates working code, replace this line with your e...

1..10 | foreach-object { $fileName = "file_name_$_.txt" Write-Progress -Activity "Copying files" -Status "$($_*10) %" -Id 1 -PercentComplete ($_*10) -CurrentOperation "Copying file $fileName" 1..100 | foreach-object { ...

Build: xcodebuild -exportArchive -exportFormat ipa \ -archivePath "/Users/username/Desktop/MyiOSApp.xcarchive" \ -exportPath "/Users/username/Desktop/MyiOSApp.ipa" \ -exportProvisioningProfile "MyCompany Distribution Profile" Archive: xcodebuild -pro...

To consume a REST API with RestTemplate, create a Spring boot project with the Spring boot initialzr and make sure the Web dependency is added: <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dep...

ActiveRecord includes default_scope, to automatically scope a model by default. class Post default_scope ->{ where(published: true).order(created_at: :desc) } end The above code will serve posts which are already published when you perform any query on the model. Post.all # will only lis...

JSON_MODIFY function can be used to append new value to some array inside JSON: update Product set Data = JSON_MODIFY(Data, 'append $.tags', "sales") where ProductID = 17; New value will be appended at the end of the array, or a new array with value ["sales"] will be create...

In this example, Tags array may contain various keywords like ["promo", "sales"], so we can open this array and filter values: select ProductID, Name, Color, Size, Price, Quantity from Product CROSS APPLY OPENJSON(Data, '$.Tags') where value = 'sales' OPENJSON will op...

PL/SQL uses IN, OUT, IN OUT keywords to define what can happen to a passed parameter. IN specifies that the parameter is read only and the value cannot be changed by the procedure. OUT specifies the parameter is write only and a procedure can assign a value to it, but not reference the value. IN ...

OPENJSON function parses collection of JSON objects and returns values from JSON text as set of rows. declare @json nvarchar(4000) = N'[ {"Number":"SO43659","Date":"2011-05-31T00:00:00","Customer": "MSFT","Price":59.99,"Q...

JSON may have complex structure with inner arrays. In this example, we have array of orders with nested sub array of OrderItems. declare @json nvarchar(4000) = N'[ {"Number":"SO43659","Date":"2011-05-31T00:00:00", "Items":[{"Price"...

SQL Server 2012 It converts string data type to target data type(Date or Numeric). For example, source data is string type and we need to covert to date type. If conversion attempt fails it returns NULL value. Syntax: TRY_PARSE (string_value AS data_type [ USING culture ]) String_value – This is...

NULL is a special case when it comes to comparisons. Assume the following data. id someVal ---- 0 NULL 1 1 2 2 With a query: SELECT id FROM table WHERE someVal = 1 would return id 1 SELECT id FROM table WHERE someVal <> 1 would return id 2 SELECT id FROM tabl...

When performance is a concern, invoking a method via reflection (i.e. via the MethodInfo.Invoke method) is not ideal. However, it is relatively straightforward to obtain a more performant strongly-typed delegate using the Delegate.CreateDelegate function. The performance penalty for using reflecti...

What we have is a list of credit cards and we'd like to calculate the premiums for all those cards that the credit card company has to pay out. The premiums themselves depend on the total number of credit cards, so that the company adjust them accordingly. We already have a function that calculate...

The fact that the garbage collection will clean up does not mean that you should wait for the garbage collection cycle to clean up. In particular you should not wait for garbage collection to close file handles, database connections and open network connections. for example: In the following code...

Progress bars can be styled with the progress[value] selector. This example gives a progress bar a width of 250px and a height of 20px progress[value] { width: 250px; height: 20px; } Progress bars can be especially difficult to style. Chrome / Safari / Opera These browsers use the -web...