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POEliminate unnecessary drawing of an image when using dc?
 

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  1. POEliminate unnecessary drawing of an image when using dc?
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    <p>I have three questions that I could really use some help on. Hope I'm not asking too much. </p> <p><strong>1)</strong> I am designing a simple GUI that contains one frame and one panel. Let's say I have two images that I draw on the panel using dc. One image will be continually fade in and out (on a timer), and the second is stationary (doesn't change). The fading is accomplished by changing the opacity of the image and use dc.Clear() before redrawing the new version of the image. </p> <p>My question is this: how would I draw the fading in/out image without affecting the second image which does not change? It seems like this causes unnecessary drawing as the stationary image will be redrawn alongside the fading image. Could I selectively clear just the first image without affecting the second? This is my drawing function:</p> <pre><code>def on_paint(self, event): dc = wx.PaintDC(self) dc = wx.BufferedDC(dc) brush = wx.Brush('#3B3B3B') dc.SetBackground(brush) dc.Clear() # Draw the first image (stationary) dc.DrawBitmap(stationaryBitmap, 120, 0, True) # Draw the second image (fading) image = self.image.AdjustChannels(1, 1, 1, self.factoralpha) fadingBitmap = wx.BitmapFromImage(image) dc.DrawBitmap(fadingBitmap, 120, 0, True) </code></pre> <p><strong>2)</strong> How can I bind an event to a wx.Image object? I would like to be able to click on the fading in/out image, though I can't seem to assign it an id. The goal is to bind an event similar to what I could do with a wx.StaticBitmap. </p> <pre><code>self.image = wx.Image("C:\image.png", wx.BITMAP_TYPE_PNG) # Trying to bind an event, but no ID is assigned self.Bind(wx.EVT_BUTTON, self.go_button, id=self.image.GetId()) </code></pre> <p><strong>3)</strong> Is it possible to place wx.DrawBitmap in a sizer? It appears that it only takes an x,y coordinate pair.</p> <pre><code>dc.DrawBitmap(bitmap, 120, 0, True) </code></pre> <p>Thanks everyone. </p>
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