A Swift implementation of the Cartesian Coordinate System.

Installation

GraphPoint is distributed using the Swift Package Manager. To install it into a project, add it as a dependency within your Package.swift manifest:

let package = Package(
    ...
    dependencies: [
        .package(url: "https://github.com/richardpiazza/GraphPoint.git", from: "4.0.0")
    ],
    ...
)

Then import GraphPoint wherever you’d like to use it:

import GraphPoint

Dependencies

GraphPoint relies heavily on the Swift2D library, which reimplements Rect, Size, and Point in a cross-platform, non-Foundation reliant way.

Deprecations

The CoreGraphics aliases have been deprecated and replaced by their Cartesian counterparts. These type-aliases and GraphPointUI will be removed in a future version.

Usage

There are several key aspects to understand when using GraphPoint.

CartesianPlane

A Cartesian plane is defined by two perpendicular number lines: the x-axis, which is horizontal, and the y-axis, which is vertical. Using these axes, we can describe any point in the plane using an ordered pair of numbers.

In GraphPoint ever rectangle is a cartesian plane with the origin at the center.

CartesianFrame

A Rect contained within a CartesianPlane with an origin relative to the cartesianOrigin of the plane. For example:

// Visualize graph paper with axes extending 50 points in all four directions from the center of the paper.
let plane = CartesianPlan(size: Size(width: 100, height: 100))
// A 10x10 piece of paper is placed on top of the graph paper; placed 40 points from both the top and left edges. 
let rect = Rect(origin: Point(x: 40, y: 40), size: Size(width: 10, height: 10))
// In relation to the graph, the smaller rectangle would have an 'origin' at (-10, 10).
let cartesianFrame = plane.rect(for: rect)
cartesianFrame == Rect(origin: Point(x: -10, y: 10), size: Size(width: 10, height: 10))

CartesianPoint

A point within a CartesianPlane. The x & y coordinates of a CartesianPoint represent the offset from the planes ‘origin’ (0, 0).