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Class JXG.View3D

JXG.GeometryElement
      ↳ JXG.View3D

Creates a new 3D view. Do not use this constructor to create a 3D view. Use JXG.Board#create with type View3D instead.

Defined in: view3d.js.
Extends JXG.GeometryElement.

Class Summary
Constructor Attributes Constructor Name and Description
 
JXG.View3D(parents, parents, attributes)
3D view inside a JXGraph board.
Fields borrowed from class JXG.GeometryElement:
_org_type, _pos, ancestors, baseElement, board, childElements, dash, dashScale, descendants, draft, dragToTopOfLayer, dump, elementClass, elType, fillColor, fillOpacity, fixed, frozen, gradient, gradientAngle, gradientCX, gradientCY, gradientEndOffset, gradientFR, gradientFX, gradientFY, gradientR, gradientSecondColor, gradientSecondOpacity, gradientStartOffset, hasLabel, highlight, highlighted, highlightFillColor, highlightFillOpacity, highlightStrokeColor, highlightStrokeOpacity, highlightStrokeWidth, id, inherits, isDraggable, isLabel, isReal, lastDragTime, layer, lineCap, methodMap, mouseover, name, needsRegularUpdate, needsUpdate, nonnegativeOnly, notExistingParents, numTraces, parents, precision, priv, quadraticform, rendNode, rotatable, scalable, shadow, snapToGrid, stdform, strokeColor, strokeOpacity, strokeWidth, subs, symbolic, tabindex, trace, traceAttributes, traces, transformations, transitionDuration, transitionProperties, type, viewport, visible, visProp, visPropCalc, withLabel
Field Summary
Field Attributes Field Name and Description
 
angles
The Tait-Bryan angles specifying the view box orientation
 
az_slide
Slider to adapt azimuth angle
 
bank_slide
Slider to adjust bank angle
 
bbox3D
Bounding box (cube) [[x1, x2], [y1,y2], [z1,z2]] of the 3D view
 
boxToCam
The 4×4 matrix that maps box coordinates to camera coordinates.
 
defaultAxes
Default axes of the 3D view, contains the axes of the view or null.
 
el_slide
Slider to adapt elevation angle
<private>  
elementsByName
An associative array / dictionary to store the objects of the board by name.
 
focalDist
The distance from the camera to the screen.
<private>  
llftCorner
<private>  
matrix3D
 
matrix3DRot
<private>  
objects
An associative array containing all geometric objects belonging to the view.
<private>  
points
An array containing all the points in the view.
 
projectionType
Type of projection.
 
r
The distance from the camera to the origin.
 
shift
The translation that moves the center of the view box to the origin.
<private>  
size
Width and height [w, h] of the 3D view if elevation and azimuth are set to 0.
 
trackballEnabled
Whether trackball navigation is currently enabled.
Fields borrowed from class JXG.GeometryElement:
_org_type, _pos, ancestors, baseElement, board, childElements, dash, dashScale, descendants, draft, dragToTopOfLayer, dump, elementClass, elType, fillColor, fillOpacity, fixed, frozen, gradient, gradientAngle, gradientCX, gradientCY, gradientEndOffset, gradientFR, gradientFX, gradientFY, gradientR, gradientSecondColor, gradientSecondOpacity, gradientStartOffset, hasLabel, highlight, highlighted, highlightFillColor, highlightFillOpacity, highlightStrokeColor, highlightStrokeOpacity, highlightStrokeWidth, id, inherits, isDraggable, isLabel, isReal, lastDragTime, layer, lineCap, methodMap, mouseover, name, needsRegularUpdate, needsUpdate, nonnegativeOnly, notExistingParents, numTraces, parents, precision, priv, quadraticform, rendNode, rotatable, scalable, shadow, snapToGrid, stdform, strokeColor, strokeOpacity, strokeWidth, subs, symbolic, tabindex, trace, traceAttributes, traces, transformations, transitionDuration, transitionProperties, type, viewport, visible, visProp, visPropCalc, withLabel
Method Summary
Method Attributes Method Name and Description
<private>  
_azEventHandler(evt)
Controls the navigation in az direction using either the keyboard or a pointer.
<private>  
_bankEventHandler(evt)
Controls the navigation in bank direction using either the keyboard or a pointer.
<private>  
_elEventHandler(evt)
Controls the navigation in el direction using either the keyboard or a pointer.
<private>  
_getW0(mat, v2d, d)
We know that v2d * w0 = mat * (1, x, y, d)^T where v2d = (1, b, c, h)^T with unknowns w0, h, x, y.
<private>  
_projectToSphere(r, x, y)
Project 2D point (x,y) to the virtual trackpad sphere, see Bell's virtual trackpad, and return z-component of the number.
<private>  
_updateCentralProjection()
 
animateAzimuth()
 
compareDepth(a, b)
Comparison function for 3D points.
 
create(elementType, parents, attributes)
Creates a new 3D element of type elementType.
<private>  
getMesh(func, interval_u, interval_v)
Generate mesh for a surface / plane.
 
intersectionLineCube(p, d, r)
Intersect a ray with the bounding cube of the 3D view.
 
intersectionPlanePlane(plane1, plane2, d)
 
isInCube(q)
Test if coordinates are inside of the bounding cube.
<private>  
isVerticalDrag()
Check if vertical dragging is enabled and which action is needed.
 
nextView()
Changes view to the next view stored in the attribute `values`.
 
previousView()
Changes view to the previous view stored in the attribute `values`.
 
project2DTo3DPlane(point2d, normal, foot)
Project a 2D coordinate to the plane defined by point "foot" and the normal vector `normal`.
 
project2DTo3DVertical(point2d, base_c3d)
Project a 2D coordinate to a new 3D position by keeping the 3D x, y coordinates and changing only the z coordinate.
 
project3DTo2D(x, y, z)
Project 3D coordinates to 2D board coordinates The 3D coordinates are provides as three numbers x, y, z or one array of length 3.
 
project3DToCube(c3d)
Limit 3D coordinates to the bounding cube.
 
projectScreenToSegment(pScr, end0, end1)
Project a point on the screen to the nearest point, in screen distance, on a line segment in 3d space.
 
select(str, onlyByIdOrName)
Select a single or multiple elements at once.
 
setCurrentView(n)
Changes view to the determined view stored in the attribute `values`.
 
setView(az, el, r)
Sets camera view to the given values.
 
stopAzimuth()
<private>  
updateProjectionTrackball(Pref)
Determine 4x4 rotation matrix with Bell's virtual trackball.
 
worldToFocal(pWorld, homog)
Map world coordinates to focal coordinates.
Methods borrowed from class JXG.GeometryElement:
_set, addChild, addDescendants, addParents, addParentsFromJCFunctions, addRotation, addTicks, addTransform, animate, bounds, clearTrace, cloneToBackground, countChildren, createGradient, createLabel, draggable, formatNumberLocale, fullUpdate, generatePolynomial, getAttribute, getAttributes, getLabelAnchor, getName, getParents, getProperty, getSnapSizes, getTextAnchor, getType, handleSnapToGrid, hasPoint, hide, hideElement, noHighlight, normalize, prepareUpdate, remove, removeAllTicks, removeChild, removeDescendants, removeTicks, resolveShortcuts, setArrow, setAttribute, setDash, setDisplayRendNode, setLabel, setLabelText, setName, setParents, setPosition, setPositionDirectly, setProperty, show, showElement, snapToPoints, update, updateRenderer, updateVisibility, useLocale
Events borrowed from class JXG.GeometryElement:
attribute, attribute:key, down, drag, keydrag, mousedown, mousedrag, mousemove, mouseout, mouseover, mouseup, move, out, over, pendown, pendrag, penup, touchdown, touchdrag, touchup, up
Class Detail
JXG.View3D(parents, parents, attributes)
3D view inside a JXGraph board.
Parameters:
{Array} parents
Array consisting of lower left corner [x, y] of the view inside the board, [width, height] of the view and box size [[x1, x2], [y1,y2], [z1,z2]]. If the view's azimuth=0 and elevation=0, the 3D view will cover a rectangle with lower left corner [x,y] and side lengths [w, h] of the board.


parents


attributes


Field Detail
angles
The Tait-Bryan angles specifying the view box orientation
az_slide
Slider to adapt azimuth angle
bank_slide
Slider to adjust bank angle
{array} bbox3D
Bounding box (cube) [[x1, x2], [y1,y2], [z1,z2]] of the 3D view
boxToCam
The 4×4 matrix that maps box coordinates to camera coordinates. These coordinate systems fit into the View3D coordinate atlas as follows. The boxToCam transformation is exposed to help 3D elements manage their 2D representations in central projection mode. To map world coordinates to focal coordinates, use the JXG.View3D#worldToFocal method.
defaultAxes
Default axes of the 3D view, contains the axes of the view or null.
Default Value:
null
el_slide
Slider to adapt elevation angle
<private> {Object} elementsByName
An associative array / dictionary to store the objects of the board by name. The name of the object is the key and value is a reference to the object.
{Number} focalDist
The distance from the camera to the screen. Computed automatically from the `fov` property.
<private> {array} llftCorner
<private> matrix3D
{The view box orientation matrix} matrix3DRot
<private> {Object} objects
An associative array containing all geometric objects belonging to the view. Key is the id of the object and value is a reference to the object.
<private> points
An array containing all the points in the view.
{String} projectionType
Type of projection.
{Number} r
The distance from the camera to the origin. In other words, the radius of the sphere where the camera sits.
shift
The translation that moves the center of the view box to the origin.
<private> {array} size
Width and height [w, h] of the 3D view if elevation and azimuth are set to 0.
{String} trackballEnabled
Whether trackball navigation is currently enabled.
Method Detail
<private> _azEventHandler(evt)
Controls the navigation in az direction using either the keyboard or a pointer.
Parameters:
{event} evt
either the keydown or the pointer event
Returns:
view
<private> _bankEventHandler(evt)
Controls the navigation in bank direction using either the keyboard or a pointer.
Parameters:
{event} evt
either the keydown or the pointer event
Returns:
view
<private> _elEventHandler(evt)
Controls the navigation in el direction using either the keyboard or a pointer.
Parameters:
{event} evt
either the keydown or the pointer event
Returns:
view
<private> _getW0(mat, v2d, d)
We know that v2d * w0 = mat * (1, x, y, d)^T where v2d = (1, b, c, h)^T with unknowns w0, h, x, y. Setting R = mat^(-1) gives 1/ w0 * (1, x, y, d)^T = R * v2d. The first and the last row of this equation allows to determine 1/w0 and h.
Parameters:
{Array} mat
{Array} v2d
{Number} d
Returns:
Array
<private> _projectToSphere(r, x, y)
Project 2D point (x,y) to the virtual trackpad sphere, see Bell's virtual trackpad, and return z-component of the number.
Parameters:
{Number} r
{Number} x
{Number} y
Returns:
Number
<private> {Array} _updateCentralProjection()
Returns:
{Array}
animateAzimuth()
compareDepth(a, b)
Comparison function for 3D points. It is used to sort points according to their z-index.
Parameters:
{Point3D} a
{Point3D} b
Returns:
Integer
{Object} create(elementType, parents, attributes)
Creates a new 3D element of type elementType.
Parameters:
{String} elementType
Type of the element to be constructed given as a string e.g. 'point3d' or 'surface3d'.
{Array} parents
Array of parent elements needed to construct the element e.g. coordinates for a 3D point or two 3D points to construct a line. This highly depends on the elementType that is constructed. See the corresponding JXG.create* methods for a list of possible parameters.
{Object} attributes Optional
An object containing the attributes to be set. This also depends on the elementType. Common attributes are name, visible, strokeColor.
Returns:
{Object} Reference to the created element. This is usually a GeometryElement3D, but can be an array containing two or more elements.
<private> getMesh(func, interval_u, interval_v)
Generate mesh for a surface / plane. Returns array [dataX, dataY] for a JSXGraph curve's updateDataArray function.
Parameters:
{Array|Function} func
{Array} interval_u
{Array} interval_v
Returns:
Array
Examples:
 var el = view.create('curve', [[], []]);
 el.updateDataArray = function () {
     var steps_u = Type.evaluate(this.visProp.stepsu),
          steps_v = Type.evaluate(this.visProp.stepsv),
          r_u = Type.evaluate(this.range_u),
          r_v = Type.evaluate(this.range_v),
          func, ret;

     if (this.F !== null) {
         func = this.F;
     } else {
         func = [this.X, this.Y, this.Z];
     }
     ret = this.view.getMesh(func,
         r_u.concat([steps_u]),
         r_v.concat([steps_v]));

     this.dataX = ret[0];
     this.dataY = ret[1];
 };
intersectionLineCube(p, d, r)
Intersect a ray with the bounding cube of the 3D view.
Parameters:
{Array} p
3D coordinates [x,y,z]
{Array} d
3D direction vector of the line (array of length 3)
{Number} r
direction of the ray (positive if r > 0, negative if r < 0).
Returns:
Affine ratio of the intersection of the line with the cube.
{Array} intersectionPlanePlane(plane1, plane2, d)
Parameters:
{JXG.Plane3D} plane1
{JXG.Plane3D} plane2
{JXG.Plane3D} d
Returns:
{Array} of length 2 containing the coordinates of the defining points of of the intersection segment.
isInCube(q)
Test if coordinates are inside of the bounding cube.
Parameters:
{array} q
3D coordinates [x,y,z] of a point.
Returns:
Boolean
<private> isVerticalDrag()
Check if vertical dragging is enabled and which action is needed. Default is shiftKey.
Returns:
Boolean
{Object} nextView()
Changes view to the next view stored in the attribute `values`.
Returns:
{Object} Reference to the view.
See:
View3D#values
{Object} previousView()
Changes view to the previous view stored in the attribute `values`.
Returns:
{Object} Reference to the view.
See:
View3D#values
{Array} project2DTo3DPlane(point2d, normal, foot)
Project a 2D coordinate to the plane defined by point "foot" and the normal vector `normal`.
Parameters:
{JXG.Point} point2d
{Array} normal
{Array} foot
Returns:
{Array} of length 4 containing the projected point in homogeneous coordinates.
{Array} project2DTo3DVertical(point2d, base_c3d)
Project a 2D coordinate to a new 3D position by keeping the 3D x, y coordinates and changing only the z coordinate. All horizontal moves of the 2D point are ignored.
Parameters:
{JXG.Point} point2d
{Array} base_c3d
Returns:
{Array} of length 4 containing the projected point in homogeneous coordinates.
{Array} project3DTo2D(x, y, z)
Project 3D coordinates to 2D board coordinates The 3D coordinates are provides as three numbers x, y, z or one array of length 3.
Parameters:
{Number|Array} x
{Number[]} y
{Number[]} z
Returns:
{Array} Array of length 3 containing the projection on to the board in homogeneous user coordinates.
project3DToCube(c3d)
Limit 3D coordinates to the bounding cube.
Parameters:
{Array} c3d
3D coordinates [x,y,z]
Returns:
Array with updated 3D coordinates.
projectScreenToSegment(pScr, end0, end1)
Project a point on the screen to the nearest point, in screen distance, on a line segment in 3d space. The inputs must be in ordinary coordinates, but the output is in homogeneous coordinates.
Parameters:
{Array} pScr
The screen coordinates of the point to project.
{Array} end0
The world space coordinates of one end of the line segment.
{Array} end1
The world space coordinates of the other end of the line segment.
{JXG.GeometryElement3D|JXG.Composition} select(str, onlyByIdOrName)
Select a single or multiple elements at once.
Parameters:
{String|Object|function} str
The name, id or a reference to a JSXGraph 3D element in the 3D view. An object will be used as a filter to return multiple elements at once filtered by the properties of the object.
{Boolean} onlyByIdOrName
If true (default:false) elements are only filtered by their id, name or groupId. The advanced filters consisting of objects or functions are ignored.
Returns:
{JXG.GeometryElement3D|JXG.Composition}
Examples:
// select the element with name A
view.select('A');

// select all elements with strokecolor set to 'red' (but not '#ff0000')
view.select({
  strokeColor: 'red'
});

// select all points on or below the x/y plane and make them black.
view.select({
  elType: 'point3d',
  Z: function (v) {
    return v <= 0;
  }
}).setAttribute({color: 'black'});

// select all elements
view.select(function (el) {
  return true;
});
{Object} setCurrentView(n)
Changes view to the determined view stored in the attribute `values`.
Parameters:
{Number} n
Index of view in attribute `values`.
Returns:
{Object} Reference to the view.
See:
View3D#values
{Object} setView(az, el, r)
Sets camera view to the given values.
Parameters:
{Number} az
Value of azimuth.
{Number} el
Value of elevation.
{Number} r Optional
Value of radius.
Returns:
{Object} Reference to the view.
stopAzimuth()
<private> {Array} updateProjectionTrackball(Pref)
Determine 4x4 rotation matrix with Bell's virtual trackball.
Parameters:
Pref
Returns:
{Array} 4x4 rotation matrix
worldToFocal(pWorld, homog)
Map world coordinates to focal coordinates. These coordinate systems are explained in the JXG.View3D#boxToCam matrix documentation.
Parameters:
{Array} pWorld
A world space point, in homogeneous coordinates.
{Boolean} homog Optional, Default: true
Whether to return homogeneous coordinates. If false, projects down to ordinary coordinates.
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