Python Wand path_curve_to_quadratic_bezier()用法及代码示例

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

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

参数	输入类型	描述
to	序列或(数字。实数，数字。实数)	代表要绘制到的坐标的一对。
control	collections.abc.sequence或(numbers.Real，numbers.Real)	用于影响曲线的坐标
smooth	bool	假设最后定义的控制坐标
relative	bool	将给定的坐标视为相对于当前点。

范例1：

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 accross 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：

范例2：

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 accross 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：

相关用法

注：本文由纯净天空筛选整理自RahulSabharwal大神的英文原创作品 Python – path_curve_to_quadratic_bezier() function in Wand。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。