DetectionsPainter class

Custom painter that renders detected object bounding boxes with class labels and confidence scores onto a canvas, mapped from original image coordinates to the rectangle the image is drawn in on screen.

Inheritance

Constructors

DetectionsPainter({required List<DetectedObject> detections, required Rect imageRectOnCanvas, required Size originalImageSize, bool showBoundingBoxes = true, bool showLabels = true, double boundingBoxThickness = 2.0, double labelFontSize = 12.0, Color? boundingBoxColor, Color labelBackground = const Color(0xCC000000), Color labelTextColor = Colors.white})

Properties

boundingBoxColor → Color?
Override color for boxes. If null, colorForClass is used per detection.
final
boundingBoxThickness → double
Stroke thickness for boxes.
final
detections → List<DetectedObject>
Detected objects to render.
final
hashCode → int
The hash code for this object.
no setterinherited
imageRectOnCanvas → Rect
On-canvas rectangle the image is drawn in (e.g. from applyBoxFit).
final
labelBackground → Color
Background fill color for the label tag. Drawn at 70% opacity over the detection's class color.
final
labelFontSize → double
Font size for labels.
final
labelTextColor → Color
Color for the label text.
final
originalImageSize → Size
Original image dimensions used to scale detection coordinates.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
semanticsBuilder → SemanticsBuilderCallback?
Returns a function that builds semantic information for the picture drawn by this painter.
no setterinherited
showBoundingBoxes → bool
Whether to draw bounding boxes.
final
showLabels → bool
Whether to draw class label + score text.
final

Methods

addListener(VoidCallback listener) → void
Register a closure to be notified when it is time to repaint.
inherited
hitTest(Offset position) → bool?
Called whenever a hit test is being performed on an object that is using this custom paint delegate.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
paint(Canvas canvas, Size size) → void
Called whenever the object needs to paint. The given Canvas has its coordinate space configured such that the origin is at the top left of the box. The area of the box is the size of the size argument.
override
removeListener(VoidCallback listener) → void
Remove a previously registered closure from the list of closures that the object notifies when it is time to repaint.
inherited
shouldRebuildSemantics(covariant CustomPainter oldDelegate) → bool
Called whenever a new instance of the custom painter delegate class is provided to the RenderCustomPaint object, or any time that a new CustomPaint object is created with a new instance of the custom painter delegate class (which amounts to the same thing, because the latter is implemented in terms of the former).
inherited
shouldRepaint(covariant DetectionsPainter oldDelegate) → bool
Called whenever a new instance of the custom painter delegate class is provided to the RenderCustomPaint object, or any time that a new CustomPaint object is created with a new instance of the custom painter delegate class (which amounts to the same thing, because the latter is implemented in terms of the former).
override
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited