Messenger.Coordinate.Coordinates

Coordinate

This module deals with the coordinate transformation.

This module is very important because it can calculate the correct position of the point you want to draw.

fixedPosToReal : InternalData -> ( Float, Float ) -> ( Float, Float )

fixedPosToReal

Same as posToReal, but add the initial position of canvas.

posToReal : InternalData -> ( Float, Float ) -> ( Float, Float )

posToReal

Transform from the virtual coordinate system to the real pixel system.

posToVirtual : InternalData -> ( Float, Float ) -> ( Float, Float )

Inverse of posToReal.

lengthToReal : InternalData -> Float -> Float

widthToReal

Use this if you want to draw something based on the length.

fromRealLength : InternalData -> Float -> Float

The inverse function of widthToReal.

maxHandW : ( Float, Float ) -> ( Float, Float ) -> ( Float, Float )

maxHandW

getStartPoint : ( Float, Float ) -> ( Float, Float ) -> ( Float, Float )

getStartPoint

judgeMouseRect : ( Float, Float ) -> ( Float, Float ) -> ( Float, Float ) -> Bool

judgeMouseRect Judge whether the mouse position is in the rectangle.

fromMouseToVirtual : InternalData -> ( Float, Float ) -> ( Float, Float )

fromMouseToVirtual