Resize Static Bitmap

wxPython Users
1

I want to create zoom in / zoom out feature when a static bitmap is displayed. How do you resize an image and the wx.StaticBitmap itself so that it appears n% larger (or smaller)?

Thanks.
Brian

2

Brian Wolf wrote:

I want to create zoom in / zoom out feature when a static bitmap is displayed. How do you resize an image and the wx.StaticBitmap itself so that it appears n% larger (or smaller)?

You'll be better off not using a wx.StaticBitmap for this. (After all static means unchanging.) Instead catch the EVT_PAINT event and draw the bitmap yourself. Then you can do things like stretching it to fit the window, or whatever you want. Just convert it to a wx.Image, manipulate it, convert to a wx.Bitmap and draw it.

···

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3

Thanks, Robin.
Sorry, but I don't know how to draw it on the screen. Do you mean with a wx.ScreenDC?

Brian

Robin Dunn wrote:

···

Brian Wolf wrote:

I want to create zoom in / zoom out feature when a static bitmap is displayed. How do you resize an image and the wx.StaticBitmap itself so that it appears n% larger (or smaller)?

You'll be better off not using a wx.StaticBitmap for this. (After all static means unchanging.) Instead catch the EVT_PAINT event and draw the bitmap yourself. Then you can do things like stretching it to fit the window, or whatever you want. Just convert it to a wx.Image, manipulate it, convert to a wx.Bitmap and draw it.

4

wx.PaintDC

Gre7g

···

--- Brian Wolf <brian.wolf@activustech.com> wrote:

Thanks, Robin.
Sorry, but I don't know how to draw it on the
screen. Do you mean with a
wx.ScreenDC?

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5

Sorry, I'm still not getting it. Can you be a little more specific?
Below are code snippets (unfortunately not working) inside a frame:

self.filename = 'images/sailboat.jpg'
self.bmp = wx.Bitmap(self.filename, wx.BITMAP_TYPE_JPEG)

..........

self.Bind(wx.EVT_PAINT, self.OnPaint)

..........

def OnPaint(self, event):
  paintdc = wx.PaintDC(self)
  x,y = self.GetPosition()
  paintdc.DrawBitmap(self.bmp, x, y)
  self.Refresh()

···

------------------------------------------------------

Brian Wolf |
Activus Technologies Corporation |
brian@activustech.com | 410.367.2958 |

------------------------------------------------------

Helping organizations gain a competitive advantage |
through intelligent application of technology. |

------------------------------------------------------

Gre7g Luterman wrote:

--- Brian Wolf <brian.wolf@activustech.com> wrote:

Thanks, Robin.
Sorry, but I don't know how to draw it on the
screen. Do you mean with a wx.ScreenDC?

wx.PaintDC

Gre7g

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6

Sorry, I'm still not getting it. Can you be a
little more specific?
Below are code snippets (unfortunately not working)
inside a frame:

self.filename = 'images/sailboat.jpg'
self.bmp = wx.Bitmap(self.filename,
wx.BITMAP_TYPE_JPEG)

..........

self.Bind(wx.EVT_PAINT, self.OnPaint)

..........

def OnPaint(self, event):
  paintdc = wx.PaintDC(self)
  x,y = self.GetPosition()

You're grabbing the window's coordinates and then
drawing the bitmap at them. Don't do that. Drawing
within the window will have coordinates normalized, so
0,0 will be the origin, regardless of the window's
position.

  paintdc.DrawBitmap(self.bmp, x, y)
  self.Refresh()

Don't Refresh(). You're telling the window it needs
to be redrawn once you've redrawn it.

Here's a snippet that does work:
http://pastie.textmate.org/74794

Gre7g

···

--- Brian Wolf <brian.wolf@activustech.com> wrote:

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