Crafty.DrawManager

Crafty.DrawManager.total2D

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

Crafty.DrawManager.onScreen

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

Crafty.DrawManager.merge

public Object Crafty.DrawManager.merge(Object set)

set

an array of rectangular regions

Merged into non overlapping rectangular region Its an optimization for the redraw regions.

Crafty.DrawManager.add

public Crafty.DrawManager.add(old, current)

old

Undocumented

current

Undocumented

Calculate the bounding rect of dirty data and add to the register of dirty rectangles

Crafty.DrawManager.debug

public Crafty.DrawManager.debug()

Crafty.DrawManager.draw

public Crafty.DrawManager.draw()

- 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

• Canvas.draw
• DOM.draw

Crafty.DrawManager.boundingRect

public Crafty.DrawManager.boundingRect(set)

set

Undocumented

- Calculate the common bounding rect of multiple canvas entities.
- Returns coords

Crafty.DrawManager.draw

public Crafty.DrawManager.draw()

- 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

• Canvas.draw
• DOM.draw