Newbie drawing Question

wxPython Users
1

I'm trying to learn about wxPython running on OS/X (Tiger).

I've been working on a text mode soccer simulation and decided to
attempt to give it a GUI. At the moment I'm just messing around but
hit upon the following behaviour I don't understand...

     37 def DrawPitch(self, dc):
     38 grass = wx.NamedColour('DARK GREEN')
     39
     40 dc.BeginDrawing()
     41 dc.SetPen(wx.Pen('WHITE', 2))
     42 dc.SetBrush(wx.Brush(grass))
     43
     44 dc.DrawRectangle(self.x1, self.y1,
     45 self.x2, self.y2)
     46 dc.DrawLine(self.x1 + 50, self.y1, self.x1 + 50, self.y2)
     47
     48 dc.EndDrawing()

If you look at the picture I attached, you'll see that the vertical
line does not extend all the way to the bottom of the rectangle. since
the rectangle goes vertically to self.y2, and the line extends to
self.y2, would have expected there to be no gap.

What am I doing, or understanding incorrectly?

Thank you very much.

screenshot_01.jpg

2

I believe the problem is that DrawRectangle takes (x,y,width,height) and not (x1,y1,x2,y2). DrawLines, on the other
hand, takes (x1,y1,x2,y2).

Depending on whether your self.y2 represents the absolute position of the lower boundary (which I suppose is
your intention) or whether it represents the height of the rectangle (which you are treating it as), you could do:

dc.DrawRectangle(self.x1,self.y1,self.x2,self.y2)
dc.DrawLine(self.x1+50,self.y1,self.x1+50,self.y1+self.y2)

-or-

dc.DrawRectangle(self.x1,self.y1,self.x2-self.x1,self.y2-self.y1)
dc.DrawLine(self.x1+50,self.y1,self.x1+50,self.y2)

Eli

···

----- Original Message ----- From: "Timothy Grant" <timothy.grant@gmail.com>
To: <wxPython-users@lists.wxwidgets.org>
Sent: Thursday, June 09, 2005 3:03 PM
Subject: [wxPython-users] Newbie drawing Question

I'm trying to learn about wxPython running on OS/X (Tiger).

I've been working on a text mode soccer simulation and decided to
attempt to give it a GUI. At the moment I'm just messing around but
hit upon the following behaviour I don't understand...

     37 def DrawPitch(self, dc):
     38 grass = wx.NamedColour('DARK GREEN')
     39
     40 dc.BeginDrawing()
     41 dc.SetPen(wx.Pen('WHITE', 2))
     42 dc.SetBrush(wx.Brush(grass))
     43
     44 dc.DrawRectangle(self.x1, self.y1,
     45 self.x2, self.y2)
     46 dc.DrawLine(self.x1 + 50, self.y1, self.x1 + 50, self.y2)
     47
     48 dc.EndDrawing()

If you look at the picture I attached, you'll see that the vertical
line does not extend all the way to the bottom of the rectangle. since
the rectangle goes vertically to self.y2, and the line extends to
self.y2, would have expected there to be no gap.

What am I doing, or understanding incorrectly?

Thank you very much.

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

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3

I'm trying to learn about wxPython running on OS/X (Tiger).

I've been working on a text mode soccer simulation and decided to
attempt to give it a GUI. At the moment I'm just messing around but
hit upon the following behaviour I don't understand...

     37 def DrawPitch(self, dc):
     38 grass = wx.NamedColour('DARK GREEN')
     39
     40 dc.BeginDrawing()
     41 dc.SetPen(wx.Pen('WHITE', 2))
     42 dc.SetBrush(wx.Brush(grass))
     43
     44 dc.DrawRectangle(self.x1, self.y1,
     45 self.x2, self.y2)
     46 dc.DrawLine(self.x1 + 50, self.y1, self.x1 + 50, self.y2)
     47
     48 dc.EndDrawing()

If you look at the picture I attached, you'll see that the vertical
line does not extend all the way to the bottom of the rectangle. since
the rectangle goes vertically to self.y2, and the line extends to
self.y2, would have expected there to be no gap.

y2 is not a coordinate, it is a height. So you want to draw to
self.y1+self.y2, to account for the vertical offset. Then subtract the
width of the pen.

···

On 6/9/05, Timothy Grant <timothy.grant@gmail.com> wrote:

What am I doing, or understanding incorrectly?

Thank you very much.

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