DotGridPainter class

A custom painter that renders a grid of dots with mesh gradient effects.

Inheritance

Constructors

DotGridPainter({required double dotSize, required double gridSpacing, required Color primaryColor, required Color backgroundColor, required Float32List pointsBuffer, List<int> dotPattern = const [1, 5], List<TouchPoint> touchPoints = const [], List<SelectionPoint> selectionPoints = const [], double blobRadius = 100.0, List<Color> gradientColors = const [], double hoverOpacity = 1.0, Map<int, bool> hoverStates = const {}, Offset gridOffset = Offset.zero})

Properties

backgroundColor → Color
Background color for inactive dots
final
blobRadius → double
Maximum radius of the blob effect
final
dotPattern → List<int>
Pattern: number of colored dots, then number of background dots For example: 1, 5 means 1 colored dot, 5 background dots, repeat
final
dotSize → double
Size of each dot in pixels
final
gradientColors → List<Color>
List of colors for mesh gradient (interpolated based on distance)
final
gridOffset → Offset
Offset of this widget relative to its DotGridGroup origin. Dots are shifted so the grid aligns across the group. Touch/selection are in canvas (same as dot positions).
final
gridSpacing → double
Spacing between dots in pixels
final
hashCode → int
The hash code for this object.
no setterinherited
hoverOpacity → double
Opacity multiplier for hover effects (0.0 to 1.0)
final
hoverStates → Map<int, bool>
Map of pointer IDs to whether they are hover events
final
pointsBuffer → Float32List
Pre-allocated buffer for dot coordinates (x, y pairs). Created once in the widget state, reused across paints.
final
primaryColor → Color
Primary color for active dots (colored dots)
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
selectionPoints → List<SelectionPoint>
Static selection points (e.g. selected tab) - drawn as filled mesh gradient
final
semanticsBuilder → SemanticsBuilderCallback?
Returns a function that builds semantic information for the picture drawn by this painter.
no setterinherited
touchPoints → List<TouchPoint>
List of active touch points with their current animation values
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 DotGridPainter 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