Viewport operators

moveViewport :: Viewport -> Coord -> IO Coord

set the lower lefthand corner of the viewport to new point within the viewed component. Moving the viewport rectangle outside the extent of the viewed component is not allowed. Attempts at doing so will cause the coordinate to be translated such that the bounding box will remain within the current bounding box of viewed component. The operation returns the actual position the viewport area was moved to.

translateViewport :: Viewport -> Translation -> IO Translation

moves the viewport area relatively. The same restrictions regarding moving the viewport area outside the viewed component's extent apply here.

resizeViewport :: Viewport -> Size -> IO

setViewportSize :: Viewport -> Size -> IO ()

change the size of the viewport area. If new size causes the area to extend beyond the boundaries of the viewed component, the position of the area is translated to try to fit the new area within the component's extent. If this is not possible, the viewed component is resized.

setViewportBBox :: Viewport -> Rectangle -> IO ()

set new position and size of the viewport rectangle.

getViewportBBox :: Viewport -> IO Rectangle

returns extent of viewport area.

getViewportSize :: Viewport -> IO Size

returns the size of the viewport area.

getViewSize :: Viewport -> IO Size

returns the current size of the viewed component.