Canvas 2D

GUI Widget

The Canvas widget provides a two-dimensional view of the raw data that is stored in a heightmap raster or pixel pyramid.

A canvas is either rectangular or a cubemap. In the latter case, the cubemap faces are unfolded and shown as a two-dimensional map.

See the Canvas API for details.

CanvasWidget.1

Controls

The 2D view of the Canvas widget can be controlled with mouse and keyboard.

For keyboard key names, please refer to the KeyboardKey API.

  • Scroll

    Scroll view using the mouse by pressing the left button and dragging the cursor.

    Center view at mouse cursor by clicking the left button.

    Rotate the center cubemap face by pressing Space or Numpad5; this is only available for cubemap canvases.

    Scroll using the arrow keys:
    ArrowLeft : left
    ArrowRight : right
    ArrowUp : up
    ArrowDown : down

    Scroll using the keys on the number block:
    Numpad1 : left / down
    Numpad2 : down
    Numpad3 : right / down
    Numpad4 : left
    Numpad6 : right
    Numpad7 : left / up
    Numpad8 : up
    Numpad9 : right / up

  • Zoom

    Use the mouse wheel to increase/decrease the zoom level.

    Zoom using the following keys:
    NumpadAdd, PageDown : increase zoom level
    NumpadSub, PageUp : decrease zoom level
    Home : minimum zoom level
    End : maximum zoom level

  • Pick

    The map coordinates under the crosshair are used to pick a raster resp. pyramid sample.

    By pressing the right mouse button and dragging the cursor, the crosshair can be moved, without scrolling. To center the view, click the left mouse button.

The Canvas widget uses standard GUI controls, see Controls for details.

Canvas

CanvasWidget.2

The Zoom slider can be used to set the zoom level of the canvas view.

The Zoom…​ buttons set the highest, next higher, next lower or lowest zoom level, respectively.

The Graticule checkbox enables or disables display of geo-referenced grid-lines.

The Data regions checkbox highlights dataset regions for which data exists.

The Void regions checkbox highlights dataset regions for which no data exists.

Map Coordinates

A Map Coordinates GUI component, attached to the current canvas.

Map Coordinates

A Heightmap Sample GUI component, attached to the current canvas.