Difference between revisions of "Porting pushStyle(), popStyle(), and boolean() to Processing.js"

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== Project Name ==
 
== Project Name ==
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Porting pushStyle(), popStyle(), and boolean() to Processing.js
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Porting pushStyle(), popStyle(), boolean(), and strokeCap() to Processing.js
  
 
== Project Description ==
 
== Project Description ==
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[http://processingjs.org/ Processing.js] remains incomplete as a port of [http://processing.org/ Processing]. Among the features still to be implemented are the functions [http://processing.org/reference/pushStyle_.html ''pushStyle()''], [http://processing.org/reference/popStyle_.html ''popStyle()''], and [http://processing.org/reference/boolean_.html ''boolean()'']. The first two functions automatically save style information for later retrieval and reuse. The last "converts" arguments into a boolean value.
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[http://processingjs.org/ Processing.js] remains incomplete as a port of [http://processing.org/ Processing]. Among the features still to be implemented are the functions [http://processing.org/reference/pushStyle_.html ''pushStyle()''], [http://processing.org/reference/popStyle_.html ''popStyle()''], [http://processing.org/reference/boolean_.html ''boolean()''], and [http://processing.org/reference/strokeCap_.html ''strokeCap()'']. The first two functions automatically save style information for later retrieval and reuse. ''boolean()'' "converts" arguments into a boolean value. ''strokeCap()'' determines how the ends of lines are rendered.
  
 
== Resources ==
 
== Resources ==
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== Project Details ==
 
== Project Details ==
 
===pushStyle() and popStyle()===
 
===pushStyle() and popStyle()===
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The number of states saved is tracked by ''pushedStates''.
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*The number of states saved is tracked by ''pushedStates''.
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*''pushStyle()'' calls ''curContext.save()'' and increments ''pushedStates'' by one.
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*Excess pops are ignored.
  
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''pushStyle()'' calls ''curContext.save()'' and increments ''pushedStates'' by one.
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===boolean()===
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*Non-zero numeric values become ''true''
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''popStyle()'' checks if there are any saved states via ''pushedStates''. If there are none an error notice to the console or as a JavaScript alert, in an attempt to provide similar behaviour to Processing's implementation. If there are saved states, the function calls ''curContext.restore()'' and decrements ''pushedStates'' by one.
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**Bytes (0's and 1's) are interpreted as numeric values.
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*''null'' and ''undefine'' become ''false''.
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*Boolean arguments are returned as themselves.
  
 
====Related Mozilla bugs====
 
====Related Mozilla bugs====

Revision as of 14:36, 23 November 2009

Project Name

Porting pushStyle(), popStyle(), boolean(), and strokeCap() to Processing.js

Project Description

Processing.js remains incomplete as a port of Processing. Among the features still to be implemented are the functions pushStyle(), popStyle(), boolean(), and strokeCap(). The first two functions automatically save style information for later retrieval and reuse. boolean() "converts" arguments into a boolean value. strokeCap() determines how the ends of lines are rendered.

Resources

Project Leader(s)

Project Contributor(s)

Project Details

pushStyle() and popStyle()

  • The number of states saved is tracked by pushedStates.
  • pushStyle() calls curContext.save() and increments pushedStates by one.
  • Excess pops are ignored.

boolean()

  • Non-zero numeric values become true
    • Bytes (0's and 1's) are interpreted as numeric values.
  • null and undefine become false.
  • Boolean arguments are returned as themselves.

Related Mozilla bugs

  • #451165 - CanvasRenderingContext2D.fillStyle and strokeStyle accept invalid colours
    • pushStyle() and popStyle() use CanvasRenderingContext2D.save() and restore(). These functions save fillStyle and strokeStyle.

boolean()

Things to do

Description Status Assigned to Link
Test cases for pushStyle() and popStyle() In progress Matthew Lam Test page
Test cases for boolean() In progress Matthew Lam Test page

Releases

Version Notes Resources
0.2 Bug fixes for pushStyle(), popStyle(), and boolean(). Functions now functional. Patch
0.1 Basic functionality for pushStyle() and popStyle(). Totally untested code for boolean(). Patch

Project News

Date Notes
Nov. 19, 2009 Release 0.2 announcement.
Oct. 19, 2009 Release 0.1 announcement.
Oct. 12, 2009 Project expanded to include boolean().
Sept. 28, 2009 Basic improvements allow the rudimentary Processing example to function in Processing.js.
Sept. 27, 2009 The initial project proposal has been posted. Repository at github created.
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