Package com.openinventor.inventor

Class SbViewportRegion

java.lang.Object
com.openinventor.inventor.Inventor
com.openinventor.inventor.SbViewportRegion
public class SbViewportRegion extends Inventor
Class for representing a viewport. This class represents the active viewport region in a display window. It contains the screen-space (pixels) size of the window as well as the origin and size of the viewport within the window. The viewport origin and size is stored both as pixel values and as normalized values (fraction of the window).

Initially the viewport is the same as the full window. Methods allow the viewport to be set either in terms of screen-space pixels or as normalized coordinates, where (0,0) is the lower-left corner of the window and (1,1) is the upper-right corner.

Remember that getWindowSize() returns the size of the window, not the viewport. Always call getViewportOriginPixels() and getViewportSizePixels() if you need the actual viewport in pixels.

Also remember:

  • To normalize a point: use the viewport origin and size.
  • To normalize a distance: use only the viewport size.

The normalize() method is convenient for normalizing a point, but note that it normalizes to the range 0..1 and some Open Inventor classes expect values normalized to the the range -1..1. Currently you must do this normalization yourself.

See Also:

  • Constructor Details

    • SbViewportRegion

      public SbViewportRegion(Dimension dim)

    • SbViewportRegion

      public SbViewportRegion(SbVec2i32 winSize)
      Calls SbViewportRegion(winSize, (float)1.0).

    • SbViewportRegion

      public SbViewportRegion(SbVec2s winSize)
      Calls SbViewportRegion(winSize, (float)1.0).

    • SbViewportRegion

      public SbViewportRegion(short width, short height)
      Calls SbViewportRegion(width, height, (float)1.0).

    • SbViewportRegion

      public SbViewportRegion(SbVec2s winSize, float newScale)
      Constructor that takes width and a height in pixels. Sets the window and the viewport.

    • SbViewportRegion

      public SbViewportRegion()
      Default constructor. Sets window size and viewport to default 100 x 100 pixels.

    • SbViewportRegion

      public SbViewportRegion(short width, short height, float newScale)
      Constructor that takes width and a height in pixels. Sets the window and the viewport.

    • SbViewportRegion

      public SbViewportRegion(SbViewportRegion vpReg)
      Constructor that takes a viewport region.

    • SbViewportRegion

      public SbViewportRegion(SbVec2i32 winSize, float newScale)
      Constructor that takes width and a height in pixels. Sets the window and the viewport.

  • Method Details

    • normalize

      public SbVec2f normalize(SbVec2s position)
      Compute the 0..1 normalized coordinates of the specified pixel position, relative to the current viewport (not window).

      Parameters:
      position - in pixel coordinates

      Returns:
      position in normalized coordinates (0 <= x,y <= 1)

    • toArray

      public static SbViewportRegion[] toArray(long nativeArray, long length)

    • getPixelsPerPoint

      public float getPixelsPerPoint()
      Convenience function that returns number of pixels per printer's point.

    • setValue

      public void setValue(SbViewportRegion copyFrom)

    • setViewportPixels

      public void setViewportPixels(short left, short bottom, short width, short height)
      Sets viewport to given region, specified as pixel coordinates in window: (0,0) is the lower-left corner. The normalized viewport origin and size are recomputed. The specified values are not clamped to the window size.

    • equals

      public boolean equals(Object obj)
      Overrides:
      equals in class Object

    • getViewportOriginPixels

      public SbVec2s getViewportOriginPixels()
      Returns viewport origin in pixels.

    • getViewportOrigin

      public SbVec2f getViewportOrigin()
      Returns viewport origin in 0..1 normalized coordinates relative to the current window size.

    • setWindowSize

      public void setWindowSize(SbVec2i32 winSize)
      Changes window size to given width and height in pixels, given as SbVec2i32. If viewport has not been explicitly set by the application, the viewport is also changed to the specified width and height. If the viewport has been explicitly set, then the stored normalized values are applied to the new window to compute a new viewport origin and size in pixels.

    • getViewportSize

      public SbVec2f getViewportSize()
      Returns viewport size in 0..1 normalized coordinates relative to the current window size.

    • getViewportOriginPixelsi32

      public SbVec2i32 getViewportOriginPixelsi32()
      Returns viewport origin in pixels.

    • setViewport

      public void setViewport(float left, float bottom, float width, float height)
      Sets viewport to given region, specified as normalized coordinates relative to the current window size, where (0,0) is the lower-left corner and (1,1) is the upper-right. The normalized values are applied to the current window size to compute a new viewport origin and size in pixels.

    • setViewportPixels

      public void setViewportPixels(SbVec2i32 origin, SbVec2i32 size)
      Sets viewport to region with given origin (lower-left corner) and size, given as pixel coordinates. The normalized viewport origin and size are recomputed. The specified values are not clamped to the window size.

    • setViewportPixels

      public void setViewportPixels(SbVec2s origin, SbVec2s size)
      Sets viewport to region with given origin (lower-left corner) and size, given as pixel coordinates. The normalized viewport origin and size are recomputed. The specified values are not clamped to the window size.

    • setViewport

      public void setViewport(SbVec2f origin, SbVec2f size)
      Sets viewport to given region, specified as normalized coordinates relative to the current window size, where (0,0) is the lower-left corner and (1,1) is the upper-right. The viewport origin and size in pixels are recomputed.

    • getWindowSizei32

      public SbVec2i32 getWindowSizei32()
      Returns window size in pixels. NOTE: By default this is also the viewport size in pixels, but in general this is not the viewport size. Use getViewportSizePixels().

    • getWindowSize

      public SbVec2s getWindowSize()
      Returns window size in pixels. NOTE: By default this is also the viewport size in pixels, but in general this is not the viewport size. Use getViewportSizePixels().

    • scaleHeight

      public void scaleHeight(float ratio)
      Scales viewport within window to be the given ratio of its current height, leaving the resulting viewport centered about the same point as the current one.

    • setPixelsPerInch

      public void setPixelsPerInch(float ppi)
      Sets the pixel-per-inch ratio for the display device the viewport is part of. The default value is 72 (1 pixel per printer's point).

    • getPixelsPerInch

      public float getPixelsPerInch()
      Returns the pixel-per-inch ratio for the display device the viewport is part of.

    • scaleWidth

      public void scaleWidth(float ratio)
      Scales viewport within window to be the given ratio of its current width, leaving the resulting viewport centered about the same point as the current one.

    • getViewportSizePixels

      public SbVec2s getViewportSizePixels()
      Returns viewport size in pixels.

    • setWindowSize

      public void setWindowSize(SbVec2s winSize)
      Changes window size to given width and height in pixels, given as SbVec2s. If viewport has not been explicitly set by the application, the viewport is also changed to the specified width and height. If the viewport has been explicitly set, then the stored normalized values are applied to the new window to compute a new viewport origin and size in pixels.

    • getViewportSizePixelsi32

      public SbVec2i32 getViewportSizePixelsi32()
      Returns viewport size in pixels.

    • getViewportAspectRatio

      public float getViewportAspectRatio()
      Returns aspect ratio (width/height) of viewport.

    • setWindowSize

      public void setWindowSize(short width, short height)
      Changes window size to given width and height in pixels. If viewport has not been explicitly set by the application, the viewport is also changed to the specified width and height. If the viewport has been explicitly set, then the stored normalized values are applied to the new window to compute a new viewport origin and size in pixels.