camera-2d

A simple 2D camera module, for use with rendering plots

Install

npm i camera-2d

API

Constructor

var camera = require('camera-2d')(options)

Creates a new camera object. The options object contains the following parameters:

• scale - the amount to rescale the view by (dimensionless unit)
• angle - the amount to rotate by in radians
• centerX - x center of translation in screen coordinate pixels
• centerY - y center of translation in screen coordinate pixels
• width - width of view port
• height - height of view port

Returns A new camera object

Properties

camera.width

The width of the viewport of the camera

camera.height

The height of the viewport of the camera

Methods

camera.getMatrix([out])

Retrieves the current state of the camera matrix

• out is a length 9 array which receives the result of the computation if not otherwise specified.

Returns The resulting camera matrix

camera.scaleRotate(dscale, dangle, centerX, centerY)

Applies a scale/roation to the camera about some point

• dscale is the amount to rescale the camera
• dangle is the change in camera rotation in degrees
• centerX is the x-component of the center of the scale/rotation
• centerY is the y-component of the center of the scale/rotation

camera.pan(dx, dy)

Pans the camera by some amount

• dx,dy are the components of the pan vector

License

(c) 2015 Mikola Lysenko. MIT License