PaintSweepGradient 继承自： PaintGradient

More information on Sweep gradient https://api.flutter.dev/flutter/dart-ui/Gradient/Gradient.sweep.html

属性

名称	类型	默认值	说明
center	Optional[OffsetValue]	required	The center of the gradient.
colors	list[str]	required	The colors the gradient should obtain at each of the stops. This list must contain at least two colors. If color_stops is provided, this list must have the same length as color_stops.
color_stops	Optional[list[Number]]	None	A list of values from 0.0 to 1.0 that denote fractions along the gradient. If provided, this list must have the same length as colors. If the first value is not 0.0, then a stop with position 0.0 and a color equal to the first color in colors is implied. If the last value is not 1.0, then a stop with position 1.0 and a color equal to the last color in colors is implied.
tile_mode	GradientTileMode	GradientTileMode.CLAMP	How this gradient should tile the plane beyond in the region before begin and after end.
start_angle	Number	0.0	The angle in https://en.wikipedia.org/wiki/Radian at which stop 0.0 of the gradient is placed. Defaults to 0.0.
end_angle	Number	math.pi * 2	The angle in radians at which stop 1.0 of the gradient is placed. Defaults to math.pi * 2.
rotation	Optional[Number]	None	The rotation of the gradient in https://en.wikipedia.org/wiki/Radian, around the center-point of its bounding box.

方法

名称	类型	默认值	说明
copy	'PaintSweepGradient'	—	返回此对象的副本，可覆盖指定属性。

示例

Canvas paint

import math

import flet as ft
import flet.canvas as cv


def main(page: ft.Page):
    page.add(
        ft.SafeArea(
            content=ft.Column(
                controls=[
                    cv.Canvas(
                        width=float("inf"),
                        expand=True,
                        shapes=[
                            cv.Path(
                                elements=[
                                    cv.Path.Arc(
                                        x=10,
                                        y=230,
                                        width=100,
                                        height=100,
                                        start_angle=3 * math.pi / 4,
                                        sweep_angle=3 * math.pi / 2,
                                    ),
                                ],
                                paint=ft.Paint(
                                    stroke_width=15,
                                    stroke_join=ft.StrokeJoin.ROUND,
                                    style=ft.PaintingStyle.STROKE,
                                    gradient=ft.PaintSweepGradient(
                                        start_angle=0,
                                        end_angle=math.pi * 2,
                                        rotation=3 * math.pi / 4,
                                        center=(60, 280),
                                        colors=[ft.Colors.YELLOW, ft.Colors.PURPLE],
                                        color_stops=[0.0, 1.0],
                                    ),
                                ),
                            ),
                        ],
                    )
                ],
            ),
        )
    )


if __name__ == "__main__":
    ft.run(main)