CanvasGraphic Class
Canvas implementation of the Graphic class.
CanvasGraphic is not intended to be used directly. Instead, use the Graphic class.
If the browser lacks SVG capabilities but has
Canvas capabilities, the Graphic
class will point to the CanvasGraphic class.
Item Index
Methods
Properties
Attributes
Methods
_appendShape
-
shape
Adds a shape instance to the graphic instance.
Parameters:
-
shapeShapeThe shape instance to be added to the graphic.
_calculateTranslate
-
position -
contentSize -
boundsSize
Determines the value for either an x or y value to be used for the translate of the Graphic.
Parameters:
Returns:
_getDocFrag
()
private
Returns a document fragment to for attaching shapes.
Returns:
_getShapeClass
-
val
Returns a shape class. Used by addShape.
Returns:
_getUpdatedContentBounds
()
Object
private
Recalculates and returns the contentBounds for the Graphic instance.
Returns:
_redraw
()
private
Redraws all shapes.
_toBack
-
Shape
Inserts shape as the first child of the content node.
Parameters:
-
ShapeCanvasShapeto add.
_toFront
-
Shape
Inserts shape on the top of the tree.
Parameters:
-
ShapeCanvasShapeto add.
addShape
-
cfg
Generates a shape instance by type.
Parameters:
-
cfgObjectattributes for the shape
Returns:
addToRedrawQueue
-
Shape
Adds a shape to the redraw queue and calculates the contentBounds. Used internally
by Shape instances.
Parameters:
-
ShapeObjectshape The shape instance to add to the queue
batch
-
method
Allows for creating multiple shapes in order to batch appending and redraw operations.
Parameters:
-
methodFunctionMethod to execute.
clear
()
Clears the graphics object.
destroy
()
Removes all nodes.
getShapeById
-
id
Returns a shape based on the id of its dom node.
Parameters:
-
idStringDom id of the shape's node attribute.
Returns:
getXY
()
Gets the current position of the graphic instance in page coordinates.
Returns:
removeAllShapes
()
Removes all shape instances from the dom.
removeShape
-
shape
Removes a shape instance from from the graphic instance.
render
-
parentNode
Adds the graphics node to the dom.
Parameters:
-
parentNodeHTMLElementnode in which to render the graphics node into.
set
-
name -
value
Sets the value of an attribute.
Properties
_shapeClass
Object
private
Look up for shape classes. Used by addShape to retrieve a class for instantiation.
Attributes
autoDraw
Boolean
private
Indicates whether or not the instance will automatically redraw after a change is made to a shape. This property will get set to false when batching operations.
Default: true
autoSize
Boolean | String
Determines the sizing of the Graphic.
- sizeContentToGraphic
- The Graphic's width and height attributes are, either explicitly set through the
widthandheightattributes or are determined by the dimensions of the parent element. The content contained in the Graphic will be sized to fit with in the Graphic instance's dimensions. When using this setting, thepreserveAspectRatioattribute will determine how the contents are sized. - sizeGraphicToContent
- (Also accepts a value of true) The Graphic's width and height are determined by the size and positioning of the content.
- false
- The Graphic's width and height attributes are, either explicitly set through the
widthandheightattributes or are determined by the dimensions of the parent element. The contents of the Graphic instance are not affected by this setting.
Default: false
contentBounds
Object
readonly
Object containing size and coordinate data for the content of a Graphic in relation to the graphic instance's position.
preserveAspectRatio
String
Determines how content is sized when autoSize is set to sizeContentToGraphic.
- none
- Do not force uniform scaling. Scale the graphic content of the given element non-uniformly if necessary such that the element's bounding box exactly matches the viewport rectangle.
- xMinYMin
- Force uniform scaling position along the top left of the Graphic's node.
- xMidYMin
- Force uniform scaling horizontally centered and positioned at the top of the Graphic's node.
- xMaxYMin
- Force uniform scaling positioned horizontally from the right and vertically from the top.
- xMinYMid Force uniform scaling positioned horizontally from the left and vertically centered.
- xMidYMid (the default)
- Force uniform scaling with the content centered.
- xMaxYMid
- Force uniform scaling positioned horizontally from the right and vertically centered.
- xMinYMax
- Force uniform scaling positioned horizontally from the left and vertically from the bottom.
- xMidYMax
- Force uniform scaling horizontally centered and position vertically from the bottom.
- xMaxYMax
- Force uniform scaling positioned horizontally from the right and vertically from the bottom.
Default: xMidYMid
render
Node | String
Whether or not to render the Graphic automatically after to a specified parent node after init. This can be a Node
instance or a CSS selector string.
resizeDown
Boolean
The contentBounds will resize to greater values but not smaller values. (for performance) When resizing the contentBounds down is desirable, set the resizeDown value to true.