On Tue, May 27, 2014 at 9:29 PM, Farrukh <[email protected]> wrote:
> Thanks for reply you were right i want to like i have drawn a picture but
> they are two shape just overlapping. but i want to display this as a single
> shape. polygon a good idea but in polygon is it possible to do like this.
> [image: shape]
>
I see -- you want a polygon with a hole in it. Unfortunately, we are
limited to what a wx.DC can do.
However, the Polygon Object can do polygons with holes in them if you draw
a continuous line from the outer boundary to the inner boundary -- it works
fine if you just want to fill, but not outline, the object.
If you want to outline the object, then you'll need to draw the outline as
two separate polylines. You could use three DrawObjects (In this case), or,
better yet, make new type of object that calls DC.DrawPolygon With no
outline, then calls DrawLines for the outline.
Alternatively, wxGraphicsContext might support this directly -- I haven't
looked.
There is also a DC.DrawPolyPolygon in wxWidgets that _might_ support this,
but it doesn't appear to be there in wxPython 2.9 -- maybe in 3.0? (I'm not
running that at the moment)
I've enclosed an example of a rectangle with a rectangular hole without the
outline.
-Chris
> Farrukh
>
>
>
> On 27-May-14 8:13 PM, Chris Barker wrote:
>
> On Tue, May 27, 2014 at 2:22 AM, Farrukh <[email protected]>wrote:
>
>> I am using FloatCanvas. I am adding "FloatCanvas.Rectangle" and for
>> points i m using onDown and onUp. but i m confused that for example
>> consider a rectangle on canvas of (-700, 785), (w=400, h=200 ) and i want
>> subtract a rectangle (-392, 472), (w=150, h=50). i can perform mathematical
>> result but what i cant do is how display this on canvas.
>
>
> I'm not sure I understand what you mean by "subtract" a rectangle. But
> if you mean you want to display the geometric intersection, or something
> like this (probably only look right with a fixed-width font):
>
> ----------
> | |
> | |
> ----------- |
> | |
> | |
> --------------------
>
> Then you'll need to compute the corners yourself, and use a Polygon
> object to display in on the Canvas.
>
> Note that if you have much to do of that sort, you may want to use a
> geometry library, like shapely, for instance.
>
> -Chris
>
>
>
>
>
>> can you please guide me in the right direction. i will be grateful for
>> your help.
>>
>> Farrukh
>>
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> Christopher Barker, Ph.D.
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Christopher Barker, Ph.D.
Oceanographer
Emergency Response Division
NOAA/NOS/OR&R (206) 526-6959 voice
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Seattle, WA 98115 (206) 526-6317 main reception
[email protected]
#!/usr/bin/env python
import wx
## import the installed version
#from wx.lib.floatcanvas import NavCanvas, FloatCanvas
## import a local version
import sys
sys.path.append("../")
from floatcanvas import NavCanvas, FloatCanvas
class DrawFrame(wx.Frame):
"""
A frame used for the FloatCanvas Demo
"""
def __init__(self, *args, **kwargs):
wx.Frame.__init__(self, *args, **kwargs)
self.CreateStatusBar()
# Add the Canvas
Canvas = NavCanvas.NavCanvas(self,-1,
size = (500,500),
ProjectionFun = None,
Debug = 0,
BackgroundColor = "DARK SLATE BLUE",
).Canvas
self.Canvas = Canvas
FloatCanvas.EVT_MOTION(self.Canvas, self.OnMove )
Points = (( 0,30),
( 0, 0),
(30, 0),
(30,30),
( 0,30),
(10,20),
(10,10),
(20,10),
(20,20),
(10,20),
)
Poly = Canvas.AddPolygon(Points,
FillColor = "blue",
LineColor = None,
)
self.Show()
Canvas.ZoomToBB()
def OnMove(self, event):
"""
Updates the status bar with the world coordinates
"""
self.SetStatusText("%.2f, %.2f"%tuple(event.Coords))
app = wx.App(False)
F = DrawFrame(None, title="FloatCanvas Demo App", size=(700,700) )
app.MainLoop()
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