TranslationYWidget Class Reference

The TranslationYWidget JavaScript class. A translatable arrow in the y axis. More...

Signals
void	valueChanged (float y)
	valueChanged signal called when the y translation value has been modified by the Transform tool. More...
Signals inherited from WidgetBase
void	dragStarted (QScriptValue dragContext)
	signal called on mouse down when picking this widget with the Transform tool More...
void	drag (QScriptValue dragContext)
	signal called when this widget is dragged with the Transform tool More...
void	dragEnded ()
	signal called on mouse up after having manipulated this widget with the Transform tool More...

Additional Inherited Members
Public Slots inherited from WidgetBase
Attribute *	data (int index=0)

Detailed Description

The TranslationYWidget JavaScript class. A translatable arrow in the y axis.

A translation along the y axis script widget. This widget offers an arrow manipulators that can be dragged in the Camera view while using the Transform tool. Dragging the arrow will generate a translation in the y axis. If no attribute is given at the construction of this object, the object will generate a double floating point attribute.

The following properties are supported by the widget:

Property	Type	Default Value	Description
data	String	-	The name of the automatically generated double floating point attribute (if none is provided)
data	Attribute	-	An attribute of double (floating point) type that can be shared with another widget or node.
radius	float	0.15	The radius of the base of the arrow manipulator in field.
length	float	1.0	The lenght of the stick of the arrow manipulator in field.
color	ColorRGBA	green	The colour of the arrow manipulator.
selection_color	ColorRGBA	light green	The colour of the arrow manipulator when selected.

The following components constitute the widget:

Component	Type
attribute	DOUBLE
drag_manipulator	TRANSLATION_Y
painter	ARROW_Y
picker	MONO
local_transformation	TRANSLATION_Y

Connect to this scriptWidget valueChanged signal to be notified when a modification has been applied to the widget. In the callback function, transfer the widget value into an action (like modifying a peg attribute value).

Controller.onShowControl = function()
{
  var translationWidget = new TranslationYWidget(
  {
    data : "TranslationY",
    min : 0.5,
    width : 1,
    color : ColorRGBA(155,0,0),
    selection_color : ColorRGBA(255,0,0)
  } );

  // Set the widget initial value.
  translationWidget.data().setValue(3);

  // Register a callback for when a transformation tool value changes.
  translationWidget.valueChanged.connect(translationYChanged);
  translationWidget.dragStarted.connect(translationDragStart);

  // Register the widget in the Controller
  Controller.controls = [];
  Controller.controls.push(translationWidget);
}

The previous example demonstrates how to instantiate a new widget and register it in the Controller global object.

var startPosition = new Point3d;

function getMCPosition()
{
  return new Point3d(
  node.getAttr(myController.node, frame.current(), "TranslationX").doubleValue(),
  node.getAttr(myController.node, frame.current(), "TranslationY").doubleValue(),
  node.getAttr(myController.node, frame.current(), "TranslationZ").doubleValue());
}

function translationDragStart(context)
{
  // Save the position of the widget at the beginning of the drag.
  startPosition = getMCPosition();
}

// Callback when the translation value has changed
function translationYChanged(newtransy) 
{ 
  // Apply an iterative translation to the peg.
  var myPegPath = getPegPath();

  // Get the difference between the previous translation and the current one.
  var mcFieldModelPosition = getMCPosition(); // ASSERT(mcFieldModelPosition.y == newtransy);
  var mcFieldModelTranslation = mcFieldModelPosition.minus(startPosition);

  // Convert the translation from fields units to OGL units. 
  var mcModelTranslation = scene.toOGL(mcFieldModelTranslation);  
  // Apply the master controller parent node matrix to convert the translation
  // from mc model OGL coordinates to world coordinates
  var worldTranslation = getWorldVector3d(mcModelTranslation, myController.node);  
  // Convert the world coordinates translation into the peg model coordinates
  var pegModelTranslation = getModelVector(worldTranslation, myPegPath);  
  // Convert the translation from OGL units back to field units
  var fieldPegModelTranslation = scene.fromOGL(pegModelTranslation);
  
  // Apply the translation to the peg position.
  var positionAttributeName = "POSITION";
  var isSeparate = node.getAttr(myPegPath, frame.current(), positionAttributeName + ".SEPARATE").boolValue();
  var pegPosition = node.getAttr(myPegPath, frame.current(), positionAttributeName).pos3dValue().add(fieldPegModelTranslation);
  if(!isSeparate)
  {
    positionAttributeName += ".3DPATH";
  }
  node.setTextAttr(myPegPath, positionAttributeName + ".X", frame.current(),  pegPosition.x);
  node.setTextAttr(myPegPath, positionAttributeName + ".Y", frame.current(),  pegPosition.y);
  node.setTextAttr(myPegPath, positionAttributeName + ".Z", frame.current(),  pegPosition.z);
  
  startPosition = mcFieldModelPosition;
}

This example shows how to apply the difference in translation of a translation widget on an arbitrary peg in the scene.

Member Function Documentation

valueChanged

void TranslationYWidget::valueChanged ( float  y )

signal

valueChanged signal called when the y translation value has been modified by the Transform tool.

Parameters

y	the new y translation value