Safe Haskell	None
Language	Haskell98

Graphics.Gloss.Data.ViewPort

Synopsis

data ViewPort = ViewPort {
- viewPortTranslate :: !(Float, Float)
- viewPortRotate :: !Float
- viewPortScale :: !Float
}
viewPortInit :: ViewPort
applyViewPortToPicture :: ViewPort -> Picture -> Picture
invertViewPort :: ViewPort -> Point -> Point

Documentation

data ViewPort Source #

The ViewPort represents the global transformation applied to the displayed picture. When the user pans, zooms, or rotates the display then this changes the ViewPort.

Constructors

ViewPort
Fields viewPortTranslate :: !(Float, Float) Global translation. viewPortRotate :: !Float Global rotation (in degrees). viewPortScale :: !Float Global scaling (of both x and y coordinates).

viewPortInit :: ViewPort Source #

The initial state of the viewport.

applyViewPortToPicture :: ViewPort -> Picture -> Picture Source #

Translates, rotates, and scales an image according to the ViewPort.

invertViewPort :: ViewPort -> Point -> Point Source #

Takes a point using screen coordinates, and uses the ViewPort to convert it to Picture coordinates. This is the inverse of applyViewPortToPicture for points.