Question

我想通过编写web2py函数myplot4（）在web2py中绘制一个sympy情节图并使用它来调用它 http://host:port/app/controller/myplot4.png

这是一个在python shell中工作的情节的演示同情代码。

from sympy import symbols
from sympy.plotting import plot
x = symbols('x')
p1 = plot(x*x)
p2 = plot(x)
p1.append(p2[0])
p1

我在http://www.web2pyslices.com/slice/show/1357/matplotlib-howto

中找到了食谱

此配方工作正常，但它导入了FigureCanvasAgg和Figure，而在同意中导入是绘图函数

有人可以告诉我如何根据这个食谱（或其他方式）编写类似的功能来绘制web2py中的sympy情节

from matplotlib.backends.backend_agg 
import FigureCanvasAgg as FigureCanvas
from matplotlib.figure import Figure
def pcolor2d(title='title',xlab='x',ylab='y',
         z=[[1,2,3,4],[2,3,4,5],[3,4,5,6],[4,5,6,7]]):
    fig=Figure()
    fig.set_facecolor('white')
    ax=fig.add_subplot(111)
    if title: ax.set_title(title)
    if xlab: ax.set_xlabel(xlab)
    if ylab: ax.set_ylabel(ylab)
    image=ax.imshow(z)
    image.set_interpolation('bilinear')
    canvas=FigureCanvas(fig)
    stream=cStringIO.StringIO()
    canvas.print_png(stream)
    return stream.getvalue()

然后尝试以下操作：

def myplot2():
    response.headers['Content-Type']='image/png'
    return pcolor2dt(z=[[1,2,3,4],[2,3,4,5],[3,4,5,6],[4,5,6,7]])

并使用

调用它们

http://host:port/app/controller/myplot2.png

Answer 1

我通过实验找到答案，这很简单。

def plot_sympy():
    from matplotlib.backends.backend_agg import FigureCanvasAgg as FigureCanvas
    from matplotlib.figure import Figure
    import io
    from sympy import symbols
    from sympy.plotting import plot
    x = symbols('x')
    p1 = plot(x*x)
    p2 = plot(x)
    p1.append(p2[0])
    s = io.BytesIO()
    p1.save(s)
    fig=Figure()
    canvas=FigureCanvas(fig)
    canvas.print_tif(s)
    return s.getvalue()
def myplot4():
    response.headers['Content-Type']='image/png'
    return plot_sympy()

在web2py中绘制一个sympy情节

1 个答案: