Python – Wand 中的 path_curve_to_quadratic_bezier()函数

path_curve_to_quadratic_bezier()绘制从当前点到给定坐标的二次贝塞尔曲线。如果 smooth 为 True，则假定控制点是上一个命令上控制点的反射，否则必须给出一对控制坐标。

Syntax : wand.drawing.path_curve_to_quadratic_bezier(to, controls, smooth, relative)

 

Parameter	Input Type	Description
to	sequence or (numbers.Real, numbers.Real)	pair which represents coordinates to drawn to.
control	collections.abc.sequence or (numbers.Real, numbers.Real)	coordinate to used to influence curve
smooth	bool	assume last defined control coordinate
relative	bool	treat given coordinates as relative to current point.

示例 #1：

Python3

from wand.image import Image
from wand.drawing import Drawing
from wand.color import Color
 
with Drawing() as draw:
    draw.stroke_width = 2
    draw.stroke_color = Color('black')
    draw.fill_color = Color('white')
    draw.path_start()
    # points list to determine curve
    points = [(40, 10), # Start point
              (20, 50), # First control
              (90, 10), # Second control
              (70, 40)] # End point
    # Start middle-left
    draw.path_move(to =(10, 100))
    # Curve across top-left to center
    draw.path_curve_to_quadratic_bezier(to =(100, 0),
                    control = points,
                    smooth = True,
                    relative = True)
    draw.path_finish()
    with Image(width = 200,
               height = 200,
               background = Color('lightgreen')) as image:
        draw(image)
        image.save(filename ="pathbcurve.png")

输出 ：

示例 #2：

Python3

from wand.image import Image
from wand.drawing import Drawing
from wand.color import Color
  
with Drawing() as draw:
    draw.stroke_width = 2
    draw.stroke_color = Color('black')
    draw.fill_color = Color('white')
    draw.path_start()
    # Start middle-left
    draw.path_move(to=(100, 100))
    # Curve across top-left to center
    draw.path_curve_to_quadratic_bezier(to=(100, 0),
                                        control=[(20,50),(90,10)],
                                        smooth=True,relative=True)
     
    draw.path_finish()
    with Image(width=200, height=200, background=Color('lightgreen')) as image:
        draw(image)
        image.save(filename="pathbcurve.png")

输出 ：