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tuple.dart
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tuple.dart
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import 'package:flutter/painting.dart';
import 'package:graphic/src/common/label.dart';
import 'package:graphic/src/coord/coord.dart';
import 'package:graphic/src/graffiti/element/label.dart';
import 'package:graphic/src/mark/mark.dart';
import 'package:graphic/src/mark/modifier/modifier.dart';
import 'package:graphic/src/scale/scale.dart';
import 'package:graphic/src/shape/shape.dart';
import 'package:graphic/src/util/assert.dart';
import 'package:graphic/src/variable/variable.dart';
/// The tuple to store the original values of a datum.
///
/// The key strings are variable names. The value types can only be [num], [String],
/// or [DateTime].
///
/// See also:
///
/// - [Variable], which creates original value tuple fields from input datum.
typedef Tuple = Map<String, dynamic>;
/// The tuple to store the scaled values of a datum.
///
/// The key strings are variable names.
///
/// See also:
///
/// - [Scale], which converts original value tuples to scaled value tuples.
/// - [Tuple], original value tuple.
typedef Scaled = Map<String, num>;
/// The aesthetic attribute values of a tuple.
class Attributes {
/// Creates a attributes.
Attributes({
required this.index,
this.tag,
required this.position,
required this.shape,
this.color,
this.gradient,
this.elevation,
this.label,
this.size,
}) : assert(isSingle([color, gradient]));
/// The index of the tuple in all tuples list.
final int index;
final String? tag;
/// Position points of the tuple.
///
/// The count of points is determined by the geometry mark type. The values
/// of each point dimension is scaled and normalized value of `[0, 1]`. the position
/// points can be converted to canvas points by [CoordConv].
final List<Offset> position;
/// The shape of the tuple.
final Shape shape;
/// The color of the tuple.
final Color? color;
/// The gradient of the tuple.
final Gradient? gradient;
/// The shadow elevation of the tuple.
final double? elevation;
/// The label of the tuple.
final Label? label;
/// The size of the tuple.
final double? size;
/// The represent point of [position] points.
Offset get representPoint => shape.representPoint(position);
/// Returns a new attributes that matches this attributes with the position replaced
/// with [p].
///
/// This method is mainly used for [Modifier]s.
Attributes withPosition(List<Offset> p) => Attributes(
index: index,
tag: tag,
position: p,
shape: shape,
color: color,
gradient: gradient,
elevation: elevation,
label: label,
size: size,
);
/// Returns the original state of an item attributes in animation according to
/// [entrance] type.
Attributes deflate(Set<MarkEntrance> entrance) {
var rst = this;
if (entrance.contains(MarkEntrance.x)) {
rst = Attributes(
index: rst.index,
tag: rst.tag,
position: rst.position
.map((p) => Offset(p.dx.isFinite ? 0 : p.dx, p.dy))
.toList(),
shape: rst.shape,
color: rst.color,
gradient: rst.gradient,
elevation: rst.elevation,
label: rst.label,
size: rst.size,
);
}
if (entrance.contains(MarkEntrance.y)) {
rst = Attributes(
index: rst.index,
tag: rst.tag,
position: rst.position
.map((p) => Offset(p.dx, p.dy.isFinite ? 0 : p.dy))
.toList(),
shape: rst.shape,
color: rst.color,
gradient: rst.gradient,
elevation: rst.elevation,
label: rst.label,
size: rst.size,
);
}
if (entrance.contains(MarkEntrance.size)) {
rst = Attributes(
index: rst.index,
tag: rst.tag,
position: rst.position,
shape: rst.shape,
color: rst.color,
gradient: rst.gradient,
elevation: rst.elevation,
label: rst.label,
size: 0,
);
}
if (entrance.contains(MarkEntrance.opacity)) {
final labelColor = rst.label?.style.textStyle?.color;
final labelRst = labelColor == null
? rst.label
: Label(
rst.label!.text,
LabelStyle(
textStyle: rst.label!.style.textStyle!.apply(color: labelColor),
span: rst.label!.style.span,
textAlign: rst.label!.style.textAlign,
textDirection: rst.label!.style.textDirection,
textScaleFactor: rst.label!.style.textScaleFactor,
maxLines: rst.label!.style.maxLines,
ellipsis: rst.label!.style.ellipsis,
locale: rst.label!.style.locale,
strutStyle: rst.label!.style.strutStyle,
textWidthBasis: rst.label!.style.textWidthBasis,
textHeightBehavior: rst.label!.style.textHeightBehavior,
minWidth: rst.label!.style.minWidth,
maxWidth: rst.label!.style.maxWidth,
offset: rst.label!.style.offset,
rotation: rst.label!.style.rotation,
align: rst.label!.style.align,
));
if (rst.gradient != null) {
final colorsRst =
rst.gradient!.colors.map((color) => color.withAlpha(0)).toList();
Gradient gradientRst;
if (rst.gradient is LinearGradient) {
gradientRst = LinearGradient(
begin: (rst.gradient as LinearGradient).begin,
end: (rst.gradient as LinearGradient).end,
colors: colorsRst,
stops: (rst.gradient as LinearGradient).stops,
tileMode: (rst.gradient as LinearGradient).tileMode,
transform: (rst.gradient as LinearGradient).transform,
);
} else if (rst.gradient is RadialGradient) {
gradientRst = RadialGradient(
center: (rst.gradient as RadialGradient).center,
radius: (rst.gradient as RadialGradient).radius,
colors: colorsRst,
stops: (rst.gradient as RadialGradient).stops,
tileMode: (rst.gradient as RadialGradient).tileMode,
focal: (rst.gradient as RadialGradient).focal,
focalRadius: (rst.gradient as RadialGradient).focalRadius,
transform: (rst.gradient as RadialGradient).transform,
);
} else if (rst.gradient is SweepGradient) {
gradientRst = SweepGradient(
center: (rst.gradient as SweepGradient).center,
startAngle: (rst.gradient as SweepGradient).startAngle,
endAngle: (rst.gradient as SweepGradient).endAngle,
colors: colorsRst,
stops: (rst.gradient as SweepGradient).stops,
tileMode: (rst.gradient as SweepGradient).tileMode,
transform: (rst.gradient as SweepGradient).transform,
);
} else {
throw ArgumentError('Wrong gradient type.');
}
rst = Attributes(
index: rst.index,
tag: rst.tag,
position: rst.position,
shape: rst.shape,
color: rst.color,
gradient: gradientRst,
elevation: rst.elevation,
label: labelRst,
size: rst.size,
);
} else {
rst = Attributes(
index: rst.index,
tag: rst.tag,
position: rst.position,
shape: rst.shape,
color: color!.withAlpha(0),
gradient: rst.gradient,
elevation: rst.elevation,
label: labelRst,
size: rst.size,
);
}
}
return rst;
}
}
/// Attributes lists for groups.
typedef AttributesGroups = List<List<Attributes>>;
extension AttributesGroupsExt on AttributesGroups {
/// Gets an attributes form attributes groups by [Attributes.index].
Attributes getAttributes(int index) {
for (var group in this) {
for (var attributes in group) {
if (attributes.index == index) {
return attributes;
}
}
}
throw ArgumentError('No attributes of index $index.');
}
}