MagnifyingGlass Flutter plugin

Flutter real-time magnifying glass lens widget with Barrel/Pincushion distortion. Works on Android, iOS and desktop. Doesn't work yet on web (help needed with web FFI).

Screenshot

Getting Started

Make MagnifyingGlass widget as the parent of the widget you wish to be used (usually MyHomePage).

    @override
    Widget build(BuildContext context) {
    MagnifyingGlassController magnifyingGlassController = MagnifyingGlassController();
    return MagnifyingGlass(
      controller: magnifyingGlassController,
      glassPosition: GlassPosition.touchPosition,
      borderThickness: 8.0,
      borderColor: Colors.grey,
      glassParams: GlassParams(
        startingPosition: Offset(150, 150),
        diameter: 150,
        distortion: 1.0,
        magnification: 1.2,
        padding: EdgeInsets.all(10),
      ),
      child: Scaffold( 
        body: ...,

        floatingActionButton: FloatingActionButton(
          onPressed: () => magnifyingGlassController.openGlass(),
          child: const Icon(Icons.search),
        ),
      )
    );

MagnifyingGlass properties

Name Type Description
controller MagnifyingGlassController Let you control the glass state and parameters:
openGlass()
closeGlass()
setDistortion( double distortion, double magnification )
setDiameter( int diameter )
glassPosition enum enum to set the touch behavior or sticky position
glassParams GlassParams class to set lens parameters
borderColor Color border color
borderThickness double border thickness

GlassPosition class

Name Description
touchPosition move the glass with finger touch
topLeft sticky position to top left corner of the screen
topRight sticky position to top rigth corner of the screen
bottomLeft sticky position to bottom left corner of the screen
bottomRight sticky position to bottom right corner of the screen

GlassParams class

Name Description
startingPosition the startin glass position. If not given the lens will be placed at the center of the screen.
diameter the diameter of the glass
magnification the magnification of the lens
1 means no magnification
>1 means magnification
<1 means shrinking
distortion Barrel/Pincushion distortion power
0 means no distortion
padding the padding surrounding the glass to enlarge touching area
distorsion0.5-mag1.0.png distorsion0.5-mag1.4.png distorsion2.0-mag1.7.png
distorsion 0.5
mag 1.0		 distorsion 0.5
mag 1.4		 distorsion 2.0
mag 1.7

Libraries

magnifying_glass