Image
+ type:string = 'image'
+ constructor(options)+ initialize(options)
extends
CanvasUI-1
Circle
+ type:string = 'circle'+ radius:number = 0
...
Group
+ type:string = 'group'+ objects:BaseObject[] = []
+ constructor(options)+ initialize(options)+ calcDimensions (计算边界)
reference
CanvasManager
+ constructor(options)+ initialize(options)+ setViewportTransform+ setZoom()+ getZoom()+ isEmpty()+ size()+ contains()+ add(...object)+ remove(object)+ clear()+ dispose()+ toDataURL()+ toSvg()+ toJSON()+ setActiveObject+ getActiveObjects+ discardActiveObject+ getObjects+ calcViewportBoundaries+ loadSVGFromString+ loadFromJSON
Ellipse
invoke
Point
+ x:number = 0+ y:number = 0
CanvasUI-2
BaseObject
+ constructor(options)+ initialize(options)+ setCoords+ containsPoint+ getScaledWidth+ getScaledHeight+ getCenterPoint+ getBoundingRect+ isType+ toJSON
钩子函数创建CanvasManager实例，一个实例维护一个画布对象
BoundRect
+ left:number = 0+ top:number = 0+ width:number = 0+ height:number = 0
Path
+ type:string = 'path'
CustomData
+ id:string = ''+ svgId:string = ''+ orderId:number = 0+ isVisible:boolean = true+ isSelected:boolean = false+ groupId:string = ''+ objType:string = 'sharp'+ operation:string = 'basicCut'+ dashLine:boolean = false+ flatten:boolean = false+ color:boolean = ''+ code:string = ''+ subId:number = 0
CanvasUtil
+ parseSvg(svg):BaseObject[]+ parseJson(json):BaseObject[]
Rect
+ type:string = 'rect'+ rx:number = 0+ ry:number = 0
