Python中的魔杖弧（）函数

arc()是 wand.drawing 模块中的一个函数。 arc()函数在图像中绘制弧线。您需要定义三对 (x, y) 坐标。第一和第二对坐标将是最小边界矩形，最后一对定义开始和结束度数。

Syntax : 
 

Parameters : 

 

Parameter	Input Type	Description
start	sequence or (numbers.Real, numbers.Real)	pair which represents starting x and y of the arc.
end	sequence or (numbers.Real, numbers.Real)	pair which represents ending x and y of the arc.
degree	sequence or (numbers.Real, numbers.Real)	pair which represents starting degree, and ending degree

示例 #1：

Python3

wand.drawing.arc(start, end, degree)

Python3

# Import required objects from wand modules
from wand.image import Image
from wand.drawing import Drawing
from wand.color import Color
 
# generate object for wand.drawing
with Drawing() as draw:
    # set stroke color
    draw.stroke_color = Color('black')
    # set width for stroke
    draw.stroke_width = 1
    # fill white color in arc
    draw.fill_color = Color('white')
    draw.arc(( 50, 50),  # Stating point
             ( 150, 150),  # Ending point
             (135, -45))  # From bottom left around to top right
    with Image(width = 100,
               height = 100,
               background = Color('green')) as img:
        # draw shape on image using draw() function
        draw.draw(img)
        img.save(filename ='arc.png')

输出：

示例 #2：
源图像：

Python3

# Import required objects from wand modules
from wand.image import Image
from wand.drawing import Drawing
from wand.color import Color
 
# generate object for wand.drawing
with Drawing() as draw:'
    # set stroke color
    draw.stroke_color = Color('black')
    # set width for stroke
    draw.stroke_width = 1
    # fill white color in arc
    draw.fill_color = Color('white')
    draw.arc(( 50, 50),  # Starting point
             ( 150, 150),  # Ending point
             (135, -45))  # From bottom left around to top right
    with Image(filename ="gog.png") as img:
        # draw shape on image using draw() function
        draw.draw(img)
        img.save(filename ='arc.png')

输出：