Crafty.DrawManager

src/drawing.js#L112-118
Crafty.DrawManager

An internal object manage objects to be drawn and implement the best method of drawing in both DOM and canvas

Methods and Properties

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Crafty.DrawManager.addCanvas

src/drawing.js#L263-269
public Crafty.DrawManager.addCanvas(ent)
ent

The entity to add

Add an entity to the list of Canvas objects to draw

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Crafty.DrawManager.addDom

src/drawing.js#L275-281
public Crafty.DrawManager.addDom(ent)
ent

The entity to add

Add an entity to the list of DOM object to draw

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Crafty.DrawManager.boundingRect

src/drawing.js#L326-333
public Crafty.DrawManager.boundingRect(set)
set

Undocumented

  • Calculate the common bounding rect of multiple canvas entities.
  • Returns coords
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Crafty.DrawManager.debug

src/drawing.js#L287-290
public Crafty.DrawManager.debug()
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Crafty.DrawManager.drawAll

src/drawing.js#L296-303
public Crafty.DrawManager.drawAll([Object rect])
rect

a rectangular region {_x: x_val, _y: y_val, _w: w_val, _h: h_val}

  • If rect is omitted, redraw within the viewport
  • If rect is provided, redraw within the rect
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Crafty.DrawManager.mergeSet

src/drawing.js#L233-244
public Object Crafty.DrawManager.mergeSet(Object set)
set

an array of rectangular regions

Merge any consecutive, overlapping rects into each other. Its an optimization for the redraw regions.

The order of set isn't strictly meaningful, but overlapping objects will often cause each other to change, and so might be consecutive.

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Crafty.DrawManager.onScreen

src/drawing.js#L220-226
public Crafty.DrawManager.onScreen(Object rect)
rect

A rectangle with field {_x: x_val, _y: y_val, _w: w_val, _h: h_val}

Test if a rectangle is completely in viewport

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Crafty.DrawManager.renderCanvas

src/drawing.js#L365-375
public Crafty.DrawManager.renderCanvas()
  • Triggered by the "RenderScene" event
  • If the number of rects is over 60% of the total number of objects do the naive method redrawing Crafty.DrawManager.drawAll
  • Otherwise, clear the dirty regions, and redraw entities overlapping the dirty regions.

See Also

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Crafty.DrawManager.renderDOM

src/drawing.js#L484-491
public Crafty.DrawManager.renderDOM()

When "RenderScene" is triggered, draws all DOM entities that have been flagged

See Also

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Crafty.DrawManager.total2D

src/drawing.js#L212-216

Total number of the entities that have the 2D component.