wxPython 读取 SVG（3）

wxPython 读取 SVG

wx.Image 支持图片格式如下所示：

wx.BITMAP_TYPE_BMP -- Load a Windows bitmap file.
wx.BITMAP_TYPE_GIF -- Load a GIF bitmap file.
wx.BITMAP_TYPE_JPEG -- Load a JPEG bitmap file.
wx.BITMAP_TYPE_PNG -- Load a PNG bitmap file.
wx.BITMAP_TYPE_PCX -- Load a PCX bitmap file.
wx.BITMAP_TYPE_PNM -- Load a PNM bitmap file.
wx.BITMAP_TYPE_TIFF -- Load a TIFF bitmap file.
wx.BITMAP_TYPE_TGA -- Load a TGA bitmap file.
wx.BITMAP_TYPE_XPM -- Load a XPM bitmap file.
wx.BITMAP_TYPE_ICO -- Load a Windows icon file (ICO).
wx.BITMAP_TYPE_CUR -- Load a Windows cursor file (CUR).
wx.BITMAP_TYPE_ANI -- Load a Windows animated cursor file (ANI).
wx.BITMAP_TYPE_ANY -- Will try to autodetect the format.

读取 SVG 则需要使用 wxPython 提供的一个专门的 SVG 读取类 wx.svg.SVGimage，它是继承 wx.svg.SVGimageBase。

继承关系

wx.svg.SVGimageBase 有关的方法

method	instruction
`CreateFromBytes`	Loads an SVG image from a bytes object.
`CreateFromFile`	Loads an SVG image from a file.
`Rasterize`	Renders the SVG image to a bytes object as a series of RGBA values.
`RasterizeToBuffer`	Renders the SVG image to an existing buffer as a series of RGBA values.

wx.svg.SVGimage 有关的方法，SVGimage 可以调用其父类的方法

method	instruction
`ConvertToBitmap`	Creates a wx.Bitmap containing a rasterized version of the SVG image.
`ConvertToScaledBitmap`	Automatically scales the SVG image so it will fit in the given size,
`RenderToGC`	Draw the collection of shapes and paths in the SVG image

参考代码

from wx.svg import SVGimage

def svg2bmp(svg_fliename, bmp_size):
    """SVG 转换为 bitmap

    Args:
        svg_fliename (str): SVG 文件路径
        bmp_size (wx.Sizer): bitmap 大小

    Returns:
        wx.Bitmap: 对应大小的位图
    """
    img = SVGimage.CreateFromFile(svg_fliename)
    bmp = img.ConvertToScaledBitmap(bmp_size)
    return bmp

一个简单的演示

# -*- encoding: utf-8 -*-
# Python 3.9.6 64bit
'''
@File        : read_svg.py
@Time        : 2022/01/06 14:53
@Author      : Wreng
@Description : 使用 wxpython 读取 SVG 简单演示
@Other       : version - Python 3.9.6 64bit, wxPython 4.1.1
'''

import wx
from wx.svg import SVGimage

class SVGRendderPanel(wx.Panel):

    def __init__(self, parent, bmp_size, *args, **kw):
        super().__init__(parent, *args, **kw)
        
        self.bmp_size = wx.Size(*bmp_size)
        self.statbmp = wx.StaticBitmap(self, bitmap=wx.Bitmap(*self.bmp_size))
        label = '{}x{}'.format(self.bmp_size.width, self.bmp_size.height)

        sbox = wx.StaticBoxSizer(wx.VERTICAL, self, label)
        sbox.Add(self.statbmp)

        self.SetSizer(sbox)

    def UpdateSVG(self, svg_filename):
        img = SVGimage.CreateFromFile(svg_filename)
        bmp = img.ConvertToScaledBitmap(self.bmp_size, self)
        self.statbmp.SetBitmap(bmp)

class TestFrame(wx.Frame):

    def __init__(self, *args, **kw):
        super().__init__(*args, **kw)

        self.svg_name = ".\\vscode-icon\\default_folder_opened.svg"

        self.SetBackgroundColour('white')
        self.SetTitle(self.svg_name.split('\\')[-1])

        sbox = wx.BoxSizer(wx.HORIZONTAL)
        
        for d in [32, 64, 128]:
            sbd = SVGRendderPanel(self, (d,d))
            sbd.UpdateSVG(self.svg_name)
            sbox.Add(sbd, 0, wx.ALL, 10)
        
        self.SetSizer(sbox)

if __name__ == '__main__':

    app = wx.App()
    frm = TestFrame(None)
    frm.Show()
    app.MainLoop()

运行结果：

运行结果

图标来自 vscode-icons，可点此下载。

相关参考