Point
A point is a zero-dimensional location in a geometric or coordinate space represented by an ordered set of coordinate values.
Geometry for Programmers
A point is a zero-dimensional geometric location that can serve as an element of a curve or surface.
- How it is used
- Establishes points as geometric building blocks and distinguishes them from numbers and vectors.
- How deep it goes
- Defines coordinate notation, separates points from vectors, and explains triangle membership; defers deeper understanding to later practice.
- Examples
- Uses A = (0.5, 1.5), point vectors from the origin, and triangle vertices, edges, interiors, and boundary points.
- What you can do after
- Evaluate/understand whether geometry terminology and coordinate representations correctly distinguish points, vectors, vertices, and interior membership.
Just Use Postgres!
Point is a PostGIS geometric subtype representing a single position with coordinate values.
- How it is used
- Supports location-based storage, coordinate conversion, map links, and nearby-place searches in PostGIS.
- How deep it goes
- Explains subtype declarations, coordinate systems, construction, transformation, coordinate extraction, and planar proximity queries without covering indexing internals.
- Examples
- Uses Tampa city coordinates, OpenStreetMap URLs, Miami coordinates, and restaurants near the Roost Apartment Hotel.
- What you can do after
- Apply PostGIS functions to create points, transform coordinate systems, extract coordinates, and find nearby locations.
Advanced Algorithms and Data Structures
A point is a record representing a position in a multidimensional space through an ordered collection of coordinate values.
- How it is used
- Represents searchable positions or attribute tuples inside multidimensional indexing and nearest-neighbor structures.
- How deep it goes
- Defines points as coordinate tuples and uses them in tree construction and queries without developing point-specific algorithms.
- Examples
- Uses coordinate tuples, Cartesian-plane datasets, and price-and-rating pairs as concrete point examples.
- What you can do after
- Apply it via k-d trees or nearest-neighbor containers to index, compare, and query multidimensional data.
Read how Advanced Algorithms and Data Structures explains point →
Math for Web Design
A point is a location in space represented without length, width, or height, commonly by coordinates.
- How it is used
- Locates pointers and elements for canvas drawing, precise positioning, and geometry-based interface effects.
- How deep it goes
- Defines 2D coordinates and browser origins, then works through center-relative pointer calculations for a hover effect.
- Examples
- Uses cursor coordinates for canvas drawing and a card’s center point for mouse-responsive rotation.
- What you can do after
- Apply it via MouseEvent, canvas, and getBoundingClientRect() to calculate pointer and element locations.
Related concepts
- vectorcontrasts with · A vector is an ordered collection of components representing an element of a vector space.
- ST_MakePointproduced by · ST_MakePoint is a PostGIS function that constructs a point geometry from X and Y coordinates.
- nodeincludes · A node is a discrete element in a structured system, such as a graph, tree, network, or distributed system, representing an entity, state, component, or computational unit and potentially connected to other elements.
- control pointincludes · A control point is a point whose position influences the shape, direction, or local behavior of a curve or other parametric geometric representation.
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