How to resize and draw an image using wxpython?

问题

I want to load an image, resize it to a given size and after draw it in a specific position in a panel.

All this using wxpython.

How can I do it?

Thanks in advance!

回答1:

wx.Image has a Scale method that will do the resizing. The rest is normal wx coding.

Here's a complete example for you.

import wx

def scale_bitmap(bitmap, width, height):
    image = wx.ImageFromBitmap(bitmap)
    image = image.Scale(width, height, wx.IMAGE_QUALITY_HIGH)
    result = wx.BitmapFromImage(image)
    return result

class Panel(wx.Panel):
    def __init__(self, parent, path):
        super(Panel, self).__init__(parent, -1)
        bitmap = wx.Bitmap(path)
        bitmap = scale_bitmap(bitmap, 300, 200)
        control = wx.StaticBitmap(self, -1, bitmap)
        control.SetPosition((10, 10))

if __name__ == '__main__':
    app = wx.PySimpleApp()
    frame = wx.Frame(None, -1, 'Scaled Image')
    panel = Panel(frame, 'input.jpg')
    frame.Show()
    app.MainLoop()

回答2:

First off I think the wxPython Docs and Demos do a great job explaining how to use their libraries, especially because the demos can be played with on the fly to see the affect or you can revert to the original. Here is the Windows link to download all the files:

http://www.wxpython.org/download.php#binaries

That said, here is the example code from the demo:

def runTest(frame, nb, log):
    bmp = wx.Image(opj('bitmaps/image.bmp'), wx.BITMAP_TYPE_BMP).ConvertToBitmap()
    gif = wx.Image(opj('bitmaps/image.gif'), wx.BITMAP_TYPE_GIF).ConvertToBitmap()
    png = wx.Image(opj('bitmaps/image.png'), wx.BITMAP_TYPE_PNG).ConvertToBitmap()
    jpg = wx.Image(opj('bitmaps/image.jpg'), wx.BITMAP_TYPE_JPEG).ConvertToBitmap()

    panel = wx.Panel(nb, -1)

    pos = 10
    wx.StaticBitmap(panel, -1, bmp, (10, pos), (bmp.GetWidth(), bmp.GetHeight()))

    pos = pos + bmp.GetHeight() + 10
    wx.StaticBitmap(panel, -1, gif, (10, pos), (gif.GetWidth(), gif.GetHeight()))

    pos = pos + gif.GetHeight() + 10
    wx.StaticBitmap(panel, -1, png, (10, pos), (png.GetWidth(), png.GetHeight()))

    pos = pos + png.GetHeight() + 10
    wx.StaticBitmap(panel, -1, jpg, (10, pos), (jpg.GetWidth(), jpg.GetHeight()))

    return panel

Here it shows how to load an image and displays it on a panel. There are some objects not explained here, but it should give you the general gist.

回答3:

If you mean adding the image to a toolbar / listbook / toolbook etc.. you will have to convert it to a bitmap (usually only bitmaps allowed).

As far as i know you can't re-size a bitmap, therefore you will have to resize an image before and then convert it.

Here is a good example http://markandclick.com/1/post/2011/12/wxpython-resize-embedded-bitmap-before-adding-it-as-a-tool.html

Here is a copy from the example:

def getFolderBitmap():
  img = folder_icon.GetImage().Rescale(scaleW, scaleH)
  return img.ConvertToBitmap()

来源：https://stackoverflow.com/questions/2504143/how-to-resize-and-draw-an-image-using-wxpython

标签

python

image

wxpython

resize

draw