Class: ChemSpaceElement2DRenderer

Kekule.Render. ChemSpaceElement2DRenderer

new ChemSpaceElement2DRenderer(chemObj, drawBridge, renderConfigs)

Class to render ChemSpaceElement instance. The class will use concrete renderer for each child object inside.
Parameters:
Name Type Description
chemObj Kekule.ChemObject Object to be drawn.
drawBridge Object A object that implements the actual draw job.
renderConfigs Object Global configuration for rendering. This property should be an instance of Kekule.Render.Render2DConfigs.
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Extends

Methods

beginUpdateRenderer()

Call this method before a series of rendered element updating job (for instance, call update method) to avoid unnecessary redraw.
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canMeasureText(context) → {Bool}

Indicate whether current render and context can measure text dimension before drawing it. HTML Canvas is a typical environment of this type.
Parameters:
Name Type Description
context Object
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Returns:
Type
Bool

canModifyGraphic(context) → {Bool}

Whether current renderer can modify elements drawn on context.
Parameters:
Name Type Description
context Object
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Returns:
Type
Bool

clear(context) → {Bool}

Clear whole chemObj on context.
Parameters:
Name Type Description
context Object
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Returns:
Whether the actual clear job is done.
Type
Bool

doClear(context) → {Bool}

Do actual job of clear. This function should return true after actual work done. Otherwise false should be returned.
Parameters:
Name Type Description
context Object
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Returns:
Type
Bool

doClearSelf(context) → {Bool}

Do actual job of clear self (without children). Descendants should override this method. This function should return true after actual work done. Otherwise false should be returned.
Parameters:
Name Type Description
context Object
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Returns:
Type
Bool

draw(context, baseCoord, options) → {Object}

Draw an instance of ChemObject to context. The actual job is done in doDraw method. Descendants should override doDraw.
Parameters:
Name Type Description
context Object Context to be drawn, such as Canvas, SVG, VML and so on.
baseCoord Hash Base coord to draw this object, can be null to use coord of chemObj itself. This coord is based on context.
options Hash Draw options, such as draw rectangle, draw style, zoom and so on. Different renderer may requires different option params. In options hash object, there may be one special array field: partialDrawObjs. If this field is set, then only chem objects in this array will be actually drawn.
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Returns:
Drawn element on context (such as SVG) or null on direct context (such as canvas).
Type
Object

endUpdateRenderer()

Call this method after a series of rendered element updateing job, notify the renderer to redraw the context.
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estimateObjBox(context, options, allowCoordBorrow) → {Hash}

Estimate the bound box around current chemObj (in chem coord system).
Parameters:
Name Type Description
context Object
options Object
allowCoordBorrow Bool
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Returns:
A 2D or 3D box, in chemObj's coord system.
Type
Hash

estimateRenderBox(context, baseCoord, options, allowCoordBorrow) → {Hash}

Estimate the bound box need to render current chemObj (in context coord system). Note: this method should not be called outside draw(). Otherwise the result may be unreliable or even no result can be returned.
Parameters:
Name Type Description
context Object
baseCoord Hash Center coord in context to draw object. Can be null.
options Object
allowCoordBorrow Bool
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Returns:
A 2D or 3D box, in context's coord system.
Type
Hash

generateTransformParams(context, baseCoord, drawOptions, objBox) → {Hash}

Calculate the coordinate transform options from drawOptions. Descendants can override this method. Note that unit length and zoom is not take into consideration in this method.
Parameters:
Name Type Description
context Object
baseCoord Hash
drawOptions Hash
objBox Hash
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Returns:
Type
Hash

getAutoBaseCoord(drawOptions) → {Hash}

Auto calculate draw context coord by coord of chem obj. When no baseCoord is provided in draw method, this result may be used instead.
Parameters:
Name Type Description
drawOptions Hash
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Returns:
Type
Hash

getAutoScaleRefDrawLength() → {Float}

Returns the standard draw length for calculation of autoScale. Usually this is the draw length of bond. Descendants can override this method to use another length.
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Returns:
Type
Float

getAutoScaleRefObjLength() → {Float}

Returns the reference length in object to calculate autoscale.
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Returns:
Type
Float

getCoordMode() → {Int}

Report coord mode of this renderer.
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Returns:
Value from Kekule.CoordMode.
Type
Int

getFinalTransformParams(context, transformParams) → {Hash}

Calculate the final params for translation. Zoom and unit length are taken into consideration.
Parameters:
Name Type Description
context Object
transformParams Hash
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Returns:
Type
Hash

getRenderCache() → {Hash}

Returns draw params (center coord, options, matrix...) on last draw process on context.
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Returns:
Type
Hash

isChemObjRenderedBySelf(context, obj) → {boolean}

Indicate whether a chemObj (including childObj) is rendered by this renderer, or should be rendered by this renderer. Descendants may override this method.
Parameters:
Name Type Description
context Object
obj Object
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Returns:
Type
boolean

isChemObjRenderedDirectlyBySelf(context, obj) → {boolean}

Indicate whether a chemObj (including childObj) is rendered directly by this renderer (not by child renderers). Descendants may override this method.
Parameters:
Name Type Description
context Object
obj Object
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Returns:
Type
boolean

isRootRenderer()

Check if current renderer is the topmost one (without parent renderer, but maybe has parent painter).
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isUpdatingRenderer() → {Bool}

Check if beginUpdateRenderer is called and endUpdateRenderer is not called yet.
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Returns:
Type
Bool

prepareTransformParams(context, baseCoord, drawOptions) → {Hash}

Prepare 2D transform params from baseCoord and drawOptions. If drawOptions.transformParams already set, this method will do nothing.
Parameters:
Name Type Description
context Object
baseCoord Hash
drawOptions Hash
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Returns:
Type
Hash

redraw(context)

Redraw previous object on context with same draw options. Should not be called before draw.
Parameters:
Name Type Description
context Object
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removeDrawnElem(context, elem)

Remove an element in context.
Parameters:
Name Type Description
context Object
elem Object
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transformContextCoordToScreen(context, coord) → {Hash}

Transform a context based coord to screen based one (usually in pixel).
Parameters:
Name Type Description
context Object
coord Hash
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Returns:
Type
Hash

transformCoordToContext(context, chemObj, coord) → {Hash}

Transform a chemObj based inner coord to context based one.
Parameters:
Name Type Description
context Object
chemObj Kekule.ChemObject
coord Hash
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Returns:
Type
Hash

transformCoordToObj(context, chemObj, coord) → {Hash}

Transform a context based coord to inner coord basd on chemObj coord system.
Parameters:
Name Type Description
context Object
chemObj Kekule.ChemObject
coord Hash
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Returns:
Type
Hash

transformScreenCoordToContext(context, coord) → {Hash}

Transform a screen based coord to context based one. Note that only 2D renderer can map screen coord back.
Parameters:
Name Type Description
context Object
coord Hash
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Returns:
Type
Hash

update(context, updatedObjDetails, updateType) → {Bool}

Update a child object inside chemObj. Must be called after draw.
Parameters:
Name Type Description
context Object
updatedObjDetails Variant Object detail containing field {obj, propNames} or array of details.
updateType Int Value from Kekule.Render.ObjectUpdateType
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Returns:
Type
Bool

updateEx(updateInfos) → {Bool}

Do a update job according to info provided by updateItems. Must be called after draw.
Parameters:
Name Type Description
updateInfos Array Each item has format: {context, items: [{updateType, updatedObjDetails: [{obj, propNames}]}]}
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Returns:
Type
Bool

Events

clear

Invoked when whole chem object (molecule, reaction...) is cleared from context. event param of it has two fields: {context, obj} NOTE: this event is not well implemented and may be buggy.
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draw

Invoked when whole chem object (molecule, reaction...) is drawn in context. event param of it has two fields: {context, obj}
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prepareDrawing

Invoked when whole chem object (molecule, reaction...) is prepared to be drawn in context. event param of it has two fields: {context, obj}
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updateBasicDrawObject

Invoked when a basic object (node, connector, glyph...) is drawn, updated or removed. event param of it has fields: {obj, parentObj, boundInfo, updateType} where boundInfo provides the bound box information of this object on context. It has the following fields: { context: drawing context object obj: drawn object parentObj: parent of drawn object boundInfo: a hash containing info of bound, including fields: { shapeType: value from Kekule.Render.MetaShapeType or Kekule.Render.Meta3DShapeType. coords: [Array of coords] } updateType: add, modify or remove } boundInfo may also be a array for complex situation (such as multicenter bond): [boundInfo1, boundInfo2, boundInfo3...]. Note that in removed event, boundInfo may be null.
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