几何数据模拟（GeometryGenerator）
机理： GeometryGenerator的每个类都拥有一个bias参数，默认是0， 表明获取的是目标的源数据，当bias不为0的时候，数据会进行[-bias/2, bias/2]范围内的偏移（或者说噪音影响）
椭圆边缘
static MatrixType ellipse_edge({
int size = 50,
required double a,
required double b,
int? seed,
double bias
})
example
...
final List<List<double>> ellipseEdgeDatas = GeometryGenerator.ellipse_edge(
a: 4.0, b: 3.0, size: 100
).toList<double>() as List<List<double>>;
...
ScatterChartData(
scatterSpots: List<ScatterSpot>.generate(100, (e) {
var [x, y] = ellipseEdgeDatas[e];
return ScatterSpot(x, y,);
})
)
...
效果
椭圆区域
static MatrixType ellipse_area({
int size = 50,
required double a,
required double b,
int? seed,
double bias
})
example
...
final List<List<double>> ellipseAreaDatas = GeometryGenerator.ellipse_area(
a: 4.0, b: 3.0, size: 1500
).toList<double>() as List<List<double>>;
...
ScatterChartData(
scatterSpots: List<ScatterSpot>.generate(1500, (e) {
var [x, y] = ellipseAreaDatas[e];
return ScatterSpot(x, y,);
})
),
...
效果
圆边缘
static MatrixType circle_edge({
int size = 50,
required double r,
int? seed,
double bias
})
example
...
final List<List<double>> circleEdgeDatas = GeometryGenerator.circle_edge(
r: 3.0, size: 100
).toList<double>() as List<List<double>>;
...
body: ScatterChart(
ScatterChartData(
scatterSpots: List<ScatterSpot>.generate(100, (e) {
var [x, y] = circleEdgeDatas[e];
return ScatterSpot(x, y,);
})
),
...
效果
圆区域
static MatrixType circle_area({
int size = 50,
required double r,
int? seed,
double bias
})
example
...
final List<List<double>> datas = GeometryGenerator.circle_area(
r: 3.0, size: 1000
).toList<double>() as List<List<double>>;
...
body: ScatterChart(
ScatterChartData(
scatterSpots: List<ScatterSpot>.generate(1000, (e) {
var [x, y] = datas[e];
return ScatterSpot(x, y,);
})
),
...
效果
线性模拟
static MatrixType line({
int size = 50,
required math.Point<double> start,
required math.Point<double> end,
int? seed,
double bias
})
example
...
final List<List<double>> datas = GeometryGenerator.line(
start: const math.Point(0.0, 0.0), end: const math.Point(5.0, 4.0), size: 100
).toList<double>() as List<List<double>>;
...
body: ScatterChart(
ScatterChartData(
scatterSpots: List<ScatterSpot>.generate(100, (e) {
var [x, y] = datas[e];
return ScatterSpot(x, y,);
})
),
),
...
效果
注：如果提供一元函数的系数来进行模拟，可以使用linewb来构造
三角形轮廓
static MatrixType triangle_edge(
{int size = 50,
required math.Point<double> a,
required math.Point<double> b,
required math.Point<double> c,
int? seed,
double bias})
example
...
final List<List<double>> datas = GeometryGenerator.triangle_edge(
a: const math.Point(0.0, 0.0),
b: const math.Point(3.0, 3.0),
c: const math.Point(4, -2),
size: 100
).toList<double>() as List<List<double>>;
...
body: ScatterChart(
ScatterChartData(
scatterSpots: List<ScatterSpot>.generate(100, (e) {
var [x, y] = datas[e];
return ScatterSpot(x, y,);
})
),
...
效果
三角形区域
static MatrixType triangle_area(
{int size = 50,
required math.Point<double> a,
required math.Point<double> b,
required math.Point<double> c,
int? seed,
double bias})
example
...
final List<List<double>> datas = GeometryGenerator.triangle_area(
a: const math.Point(0.0, 0.0),
b: const math.Point(3.0, 3.0),
c: const math.Point(4, -2),
size: 1000
).toList<double>() as List<List<double>>;
...
body: ScatterChart(
ScatterChartData(
scatterSpots: List<ScatterSpot>.generate(1000, (e) {
var [x, y] = datas[e];
return ScatterSpot(x, y,);
})
),
...
效果
四边形轮廓
static MatrixType quadrilateral_edge(
{int size = 50,
required math.Point<double> a,
required math.Point<double> b,
required math.Point<double> c,
required math.Point<double> d,
int? seed,
double bias})
注意：从a到d是按照顺序连接的
example
...
final List<List<double>> datas = GeometryGenerator.quadrilateral_edge(
a: const math.Point(0.0, 0.0),
b: const math.Point(5.0, 0.0),
c: const math.Point(5, 3),
d: const math.Point(0, 3),
size: 500
).toList<double>() as List<List<double>>;
...
body: ScatterChart(
ScatterChartData(
scatterSpots: List<ScatterSpot>.generate(500, (e) {
var [x, y] = datas[e];
return ScatterSpot(x, y,);
})
),
...
效果
四边形区域
static MatrixType quadrilateral_area(
{int size = 50,
required math.Point<double> a,
required math.Point<double> b,
required math.Point<double> c,
required math.Point<double> d,
int? seed,
double bias})
example
...
final List<List<double>> datas = GeometryGenerator.quadrilateral_area(
a: const math.Point(0.0, 0.0),
b: const math.Point(1.5, 3),
c: const math.Point(4, 1),
d: const math.Point(2.5, -2),
size: 1500
).toList<double>() as List<List<double>>;
...
body: ScatterChart(
ScatterChartData(
scatterSpots: List<ScatterSpot>.generate(1500, (e) {
var [x, y] = datas[e];
return ScatterSpot(x, y,);
})
),
...
效果
心形线轮廓
static MatrixType heart_edge({
int size = 50,
double x_center = 0.0,
int? seed,
double bias
})
example
...
final List<List<double>> datas = GeometryGenerator.heart_edge(
x_center: 2.0,
size: 200
).toList<double>() as List<List<double>>;
...
body: ScatterChart(
ScatterChartData(
scatterSpots: List<ScatterSpot>.generate(200, (e) {
var [x, y] = datas[e];
return ScatterSpot(x, y,);
})
),
...
效果
心形区域
static MatrixType heart_area({
int size = 50,
double x_center = 0.0,
int? seed,
double bias
})
example
...
final List<List<double>> datas = GeometryGenerator.heart_area(
x_center: 2.0,
size: 1200
).toList<double>() as List<List<double>>;
...
body: ScatterChart(
ScatterChartData(
scatterSpots: List<ScatterSpot>.generate(1200, (e) {
var [x, y] = datas[e];
return ScatterSpot(x, y,);
})
),
...
效果
曲线模拟
static MatrixType curve(
double Function(double) func, {
int size = 50,
required double x1,
required double x2,
int? seed,
double bias
})
example
...
final List<List<double>> datas = GeometryGenerator.curve(
(x) => math.sin(x) + math.cos(math.pow(x, 0.5)) + math.pow(x, .4),
x1: 1.0,
x2: 10.0,
size: 100
).toList<double>() as List<List<double>>;
...
body: ScatterChart(
ScatterChartData(
scatterSpots: List<ScatterSpot>.generate(100, (e) {
var [x, y] = datas[e];
return ScatterSpot(x, y,);
})
),
...
效果
注：当想要高度定义曲线时，比如生成螺线数据、摆线数据等，可以使用custom_curve进行构造
贝塞尔曲线模拟
MatrixType bezier({
int size = 50,
required math.Point<double> start,
required math.Point<double> end,
required math.Point<double> ctrl,
int? seed,
double bias
})
example
...
final List<List<double>> datas = GeometryGenerator.bezier(
start: math.Point(0, 0),
end: math.Point(2, 2),
ctrl: math.Point(4, 0),
size: 100
).toList<double>() as List<List<double>>;
...
body: ScatterChart(
ScatterChartData(
scatterSpots: List<ScatterSpot>.generate(100, (e) {
var [x, y] = datas[e];
return ScatterSpot(x, y,);
})
),
...
效果
矩形
边缘
static MatrixType rectangle_edge({
int size = 50,
required math.Point<double> top_left,
required double width,
required double height,
int? seed,
double bias = 0.0
})
区域
static MatrixType rectangle_area({
int size = 50,
required math.Point<double> top_left,
required double width,
required double height,
int? seed,
double bias = 0.0
})
注：这两个都是继承自四边形生成器