Viewer

class cee.Viewer()

The Viewer manages the Views it contains and handles user interaction (navigation and picking).

You can add a new view with the addView function. The Viewer owns and manages the View, and you delete the view by using the deleteViewAt function.

A Viewer can have multiple views. A single model can be shared in each view, or multiple different models can be added to specific views. By default, the views are positioned automatically, but you can set the position and size of each view manually using the ViewLayoutMode accessor.

The Viewer handles the interaction with the user, both navigation (pan/rotate/zoom/walk) and selection/picking.

You can trigger a redraw of the 3D view(s) with the requestRedraw function.

Examples of the different highlight modes (See ViewerOptions.highlightMode )

Accessors

pixelScaleFactor
viewCount
viewLayoutMode

Accessors

cee.pixelScaleFactor()

The current pixel scale factor ( > 1 for ‘retina’/’high-dpi’) screen.

Return type:: number

cee.viewCount()

The number of views in the Viewer

Return type:: number

cee.viewLayoutMode()

The view layout mode for the viewer

Return type:: ViewLayoutMode

cee.viewLayoutMode(layoutMode)

Arguments:

layoutMode (ViewLayoutMode) – None

Return type:

void

Methods

addView

Viewer.addView()

Adds a view to the viewer.

This functions creates a view, adds it to the viewer and returns the newly created view.

You need at least one view in a viewer in order to display a model.

Return type:: View

deleteAllViews

Viewer.deleteAllViews()

Deletes all views from the viewer.

Return type:: void

deleteViewAt

Viewer.deleteViewAt(viewIndex)

Arguments:

viewIndex (number) – None

Deletes the view at the given index.

The index must be zero-based and between 0 and viewCount - 1

Return type:: void

enableMouseButtonTracking

Viewer.enableMouseButtonTracking(enable)

Arguments:

enable (boolean) – None

Mouse tracking needs to be enabled to use the NavigationConfig.leftAndRightMouseButtons setting.

However, for the mouse tracking to work, the browser context menu needs to be disabled.

Here is one example on how to do this:

// Disable context menu - Required for enableMouseButtonTracking
canvas.addEventListener("contextmenu", (event) => { event.preventDefault()});

// Enable mouse tracking (so we can use leftAndRightMouseButtons)
viewer.enableMouseButtonTracking(true);

// Ceetron style navigation
const navConfig = view.navigation.config;
navConfig.leftMouseButton.noModifier =cee.NavigationType.PAN;
navConfig.rightMouseButton.noModifier =cee.NavigationType.ROTATE;
navConfig.leftAndRightMouseButtons.noModifier =cee.NavigationType.WALK;
navConfig.wheelOrPinch = cee.NavigationType.WALK;

Return type:: void

enableNavigationHandling

Viewer.enableNavigationHandling(enable)

Arguments:

enable (boolean) – None

Sets the handler function to be called whenever the mouse navigation type changes.

Return type:: void

flyCameraTo

Viewer.flyCameraTo(cameraPos, viewDir, upVec, fieldOfViewYDegOrFrontPlaneFrustumHight, animDuration[, view])

Arguments:

cameraPos (Vec3Like) – None
viewDir (Vec3Like) – None
upVec (Vec3Like) – None
fieldOfViewYDegOrFrontPlaneFrustumHight (number) – None
animDuration (number) – None
view (View) – optional None

Flies the camera from the current position to the specified new position in the given view.

If the current projection in the active View camera is perspective, the fieldOfViewYDegOrFrontPlaneFrustumHight parameter is the final field of view in Y direction in degrees (as passed to Camera.setProjectionAsPerspective()).

If the current projection is ortho, the fieldOfViewYDegOrFrontPlaneFrustumHight parameter is the final front plane frustum height (as passed to Camera.setProjectionAsOrtho()).

If view is not specified then the operation is performed on the first view.

Return type:: void

getViewArray

Viewer.getViewArray()

Returns a read only array with all views in the viewer

Return type:: unknown

getViewAt

Viewer.getViewAt(viewIndex)

Arguments:

viewIndex (number) – None

Returns the view at the given index.

The index must be zero-based and between 0 and viewCount - 1

Return type:: View

oglWinPosFromClientCoord

Viewer.oglWinPosFromClientCoord(clientX, clientY)

Arguments:

clientX (number) – The X coordinate of the mouse pointer in local (DOM content) coordinates.
clientY (number) – The Y coordinate of the mouse pointer in local (DOM content) coordinates.

Convert from client (DOM content) coordinates to WebGL style coordinates

Returns:: The WebGL style <x,y> coordinate for the given client coordinate in the viewer.
Return type:: Vec2

oglWinPosFromCssCoordinate

Viewer.oglWinPosFromCssCoordinate(cssPixCoordX, cssPixCoordY)

Arguments:

cssPixCoordX (number) – The x coordinate in css pixel coordinates. This is relative to the top left corner of the Viewer’s Canvas element.
cssPixCoordY (number) – The y coordinate in css pixel coordinates. This is relative to the top left corner of the Viewer’s Canvas element.

Convert from canvas local css (DOM content) coordinates to WebGL style coordinates, similar to offsetX/Y in in MouseEvent.

Returns:: The WebGL style <x,y> coordinate for the given css coordinate in the viewer. The cssX/Y coordinates local Canvas coordinates in css (DOM content) coordinates. They are local to the Canvas element, so 0,0 is the top left corner of the Canvas element. The coordinates are in css pixels, so they are not affected by the device pixel ratio or any zoom in the browser. These coordinates are related to the MouseEvent.offsetX/Y coordinates. See https://developer.mozilla.org/en-US/docs/Web/CSS/CSSOM_View/Coordinate_systems for more on CSS coordinate systems. They correspond to the “Offset” system.
Return type:: Vec2

rayFromCssCoordinate

Viewer.rayFromCssCoordinate(view, cssPixCoordX, cssPixCoordY)

Arguments:

view (View) – None
cssPixCoordX (number) – The x coordinate in css pixel coordinates. This is relative to the top left corner of the Viewer’s Canvas element.
cssPixCoordY (number) – The y coordinate in css pixel coordinates. This is relative to the top left corner of the Viewer’s Canvas element.

Get a ray from the given Canvas/Viewer local CSS coordinate. This coordinate is relative to the top left corner of the canvas/viewer element in css pixels.

Returns:: A Ray than can be used for rayIntersect() on the various models. The input coordinates can be set from MouseEvent.offsetX/offsetY.
Return type:: Ray

requestRedraw

Viewer.requestRedraw()

Notifies that this viewer needs a redraw. This will schedule a redraw on the next timer event.

Use this method to force a redraw if you have changed something that does not update the viewer. This is not usually needed.

Return type:: void

resizeViewer

Viewer.resizeViewer(canvasDisplayWidthCSSPixels, canvasDisplayHeightCSSPixels)

Arguments:

canvasDisplayWidthCSSPixels (number) – None
canvasDisplayHeightCSSPixels (number) – None

Sets the display size of the viewer’s canvas in CSS pixels.

Note that the input width and height is in CSS pixels which. This means that the resulting size of the canvas in physical pixels may end up being larger than the specified size depending on the currently set pixel scale factor (devicePixelRatio)

Return type:: void

rubberBandZoom

Viewer.rubberBandZoom(view, clientX, clientY, width, height)

Arguments:

view (View) – None
clientX (number) – None
clientY (number) – None
width (number) – None
height (number) – None

Zooms in or out in the view by the given rubber band rectangle.

clientX and clientY are the Top Left corner of the rectangle, specified in client coordinates (HTML window coordinates) (from e.g. a MouseEvent.clientX/Y)

NOTE: This is the only method using client coordinates. All other relevant methods use Canvas/Viewer local CSS coordinates. This behavior will change in an upcoming major release.

Return type:: void

setActiveMouseNavigationsChangedHandler

Viewer.setActiveMouseNavigationsChangedHandler(navigationHandler)

Arguments:

navigationHandler (MouseNavigationChangedHandler) – None

Sets the handler function to be called whenever the mouse navigation type changes.

Return type:: void

setCameraAnimation

Viewer.setCameraAnimation(cameraAnimation)

Arguments:

cameraAnimation (CameraAnimation) – None

Sets a camera animation that will be run for this viewer

Return type:: void

setColorLegendClickHandler

Viewer.setColorLegendClickHandler(legendClickHandler)

Arguments:

legendClickHandler (ColorLegendClickedHandler) – None

Sets the handler function to be called whenever the user clicks on a color legend.

The handler function will be passed the id of the scalar result.

Return type:: void

setPickHandler

Viewer.setPickHandler(pickHandler)

Arguments:

pickHandler (PickHandler) – None

Sets the handler function to be called whenever the user does a “clean click” in the 3D view.

No picking is performed before the given handler is invoked, so the behavior of the click is entirely up to the user.

See PickHandler for more info.

Return type:: void

setPixelScaleFactor

Viewer.setPixelScaleFactor(pixelScaleFactor)

Arguments:

pixelScaleFactor (number) – None

Set pixel scale factor.

Return type:: void

setShowDebugWindow

Viewer.setShowDebugWindow(show)

Arguments:

show (boolean) – None

Specifies if the debug overlay info window should be shown or not

Return type:: void

updatePixelScaleFactor

Viewer.updatePixelScaleFactor()

Update the current pixel scale factor by querying window.devicePixelRatio.

Return type:: void