Bu

Bu is the namespace of this library. It contains:

• Constants
• Utility Functions
• Polyfills

Constants

Shapes related

• Bu.DEFAULT_STROKE_STYLE = '#048'
• Bu.DEFAULT_FILL_STYLE = 'rgba(64, 128, 192, 0.5)'
• Bu.DEFAULT_DASH_STYLE = [8, 4]

Curve related

• Bu.DEFAULT_SPLINE_SMOOTH = 0.25 # range in [0 ~ 1]

Interaction related

• Bu.DEFAULT_STROKE_STYLE_HOVER = 'rgba(255, 128, 0, 0.75)'
• Bu.DEFAULT_FILL_STYLE_HOVER = 'rgba(255, 128, 128, 0.5)'

Texts related

• Bu.DEFAULT_TEXT_FILL_STYLE = 'black'

Default size

• Bu.DEFAULT_IMAGE_SIZE = 20
• Bu.POINT_RENDER_SIZE = 2.25
• Bu.POINT_LABEL_OFFSET = 5

Bounds related

• Bu.DEFAULT_BOUND_STROKE_STYLE = '#444'
• Bu.DEFAULT_BOUND_DASH_STYLE = [6, 6]

Computation related

• Bu.DEFAULT_NEAR_DIST = 5

Mouse interact

• Bu.MOUSE_BUTTON_NONE = -1
• Bu.MOUSE_BUTTON_LEFT = 0
• Bu.MOUSE_BUTTON_MIDDLE = 1
• Bu.MOUSE_BUTTON_RIGHT = 2

Utility Functions

Function	Description
Bu.average	calculate the mean value of several numbers
Bu.bevel	calculate the hypotenuse from the cathetuses
Bu.rand	generate a random number between two numbers
Bu.r2d	convert an angle from radian to deg
Bu.now	get current time
Bu.combineOptions	combine the given options with the default options
Bu.clone	clone an Object or Array
Bu.data	use localStorage to persist data

Polyfills

Polyfill	Description
Function::property	define a property to an object
Function::throttle	limit the frequency of function call
Function::debounce	delay the call of function
Array::each	Iterate this Array and do something with the items
Array::map	Iterate this Array and map the items to a new Array