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We can align an element or the content inside it by using CSS which provides various options for alignment of an element and its content horizontally, vertically or in center.Horizontal AlignmentInline-elementsInline elements or inline-block elements such as text, anchor, span, etc. can be aligned horizontally with the help of CSS text-align property.Block-level elementsBlock-level elements such as div, p, etc. can be aligned horizontally with the help of CSS margin property, but width of element should not be 100% relative to the parent as then it wouldn’t need alignment.Block-level elements using float or position schemeElements can be aligned horizontally with the ... Read More
Spatial search structures are based on the same ideas that were invented in Computer Science during the 60's and 70's for solving the problem of quickly processing large sets of symbolic data, as opposed to geometric data, for example lists of people's names. It was invented that by first sorting a list of names according to alphabet, and storing the sorted list in an array, one can compute whether some new name is already in the list in log2n operations using a binary search algorithm, rather than n/2 expected operations required with the help of a sequential search. This is ... Read More
In computer science, a method known as binary space partitioning (BSP) is implemented for recursively subdividing a space into two convex sets by implementing hyperplanes as partitions. This process of subdividing provides rise to a representation of objects within the region in the form of a tree data structure known as a BSP tree.Binary space partitioning was invented in the context of 3D computer graphics in 1969, where the structure of a BSP tree permits for spatial information about the objects in a scene that is useful in rendering, such as objects being ordered from front-to-back with respect to a ... Read More
Compressed QuadtreesAt the time of storing every node corresponding to a subdivided cell, we may end up storing a lot of empty nodes. Cutting down on the size of such sparse trees is possible by only storing subtrees whose leaves have interesting data (i.e. "important subtrees"). Again we can actually cut down on the size even further. When we only consider important subtrees, the pruning process may avoid long paths in the tree where the intermediate nodes have degree two (a link to one parent and one child). It turns out that we only require to store the node U ... Read More
To add a new line in JavaScript alert box, use the “”:alert("Line One Line Two");ExampleYou can try to run the following code add a new line in an alert box in JavaScript:Live Demo Click the following button to see the result:
The onmouseout triggers when you move your mouse out from that element.ExampleYou can try to run the following example to learn how to call a JavaScript function from onmouseout eventLive Demo Bring your mouse inside the division to see the result: This is inside the division
The onmouseover event triggers when you bring your mouse over any element.ExampleYou can try to run the following example to learn how to call a JavaScript function from onmouseover eventLive Demo Bring your mouse inside the division to see the result: This is inside the division
The onClick event is the most frequently used event type, which occurs when a user clicks the left button of the mouse. You can put your validation, warning etc., against this event type.ExampleYou can try to run the following code to call a JavaScript function from an onClick eventLive Demo Click the following button and see result
The region quadtree is useful to represent a partition of space in two dimensions by breaking the region into four equal quadrants, subquadrants, and so on with each leaf node consisting of data corresponding to a specific subregion. Each node in the tree either is associated with exactly four children or no children (a leaf node). The height of quadtrees that follow this decomposition strategy (i.e. subdividing subquadrants until and unless there is interesting data in the subquadrant for which more refinement is required) is sensitive to and dependent on the spatial distribution of interesting areas in the space being ... Read More
The point quadtree is an adaptation of a binary tree implemented to represent 2-dimensional point data. Features of all quadtrees is shared by point quadtree.It is often very efficient in comparing 2-dimensional, ordered data points, usually executing in O(log n) time. Point quadtrees are valuable mentioning for completeness, but k-d trees surpass them as tools for generalized binary search.Point quadtrees are built as follows.Given the next point to insert, we compute the cell in which it lies and add it to the tree.The new point is added such that the cell that contains it is divided into quadrants by the ... Read More