Color Problems

wxPython Users
1

John,

You've got an indentation problem.

  def DrawLines(self, dc):
    """ Redraw all lines that have been recorded """
    dc.BeginDrawing()
    x = 214
    y = 54
    for colour, thickness, line in self.lines:
      pen = wx.Pen(wx.NamedColour(colour), thickness, self.linestyle)
      dc.SetPen(pen)
      for coords in line:
        apply(dc.DrawLine, coords)

    # Too much indentation starting here! This should NOT be under the
"for" statement

    font = wx.Font(14, wx.ROMAN, wx.NORMAL, wx.NORMAL)
    dc.SetFont(font)
    colour = [('Red', 0x0000ff), ('Green', 0x00ff00), ('Blue',0xff0000),
('DarkRed', 0x000099), ('DarkGreen', 0x009900), ('DarkBlue',0x990000)]
    #0x00bbggrr
    for (text, col) in colour:
      thisColour = wx.ColourRGB(col)
      text = "%s: 0x%06x = (%d, %d, %d)" % (text, col,thisColour.Red(),
thisColour.Green(), thisColour.Blue())
      dc.SetTextForeground(thisColour)
      dc.DrawText(text, x, y)
      y = y + 20

    dc.EndDrawing()

You'll note that self.lines is empty () and that the "for" loop that draws
the lines doesn't get called because there are no lines to draw. (I
should've deleted that code from my example.)

Just for fun, replace

       self.lines=

in the "__init__ " method with:

       self.lines =
       tempLine =
       tempLine.append((200, 20, 780, 20))
       tempLine.append((780, 20, 780, 520))
       tempLine.append((780, 520, 200, 520))
       tempLine.append((200, 520, 200, 20))
       self.lines.append((self.colour, self.thickness, tempLine))

Then you'll get a black box around the list of colors.

David

···

-----Original Message-----
From: John Fabiani [mailto:jfabiani@yolo.com]
Sent: Sunday, December 12, 2004 11:08 AM
To: wxPython-users@lists.wxwidgets.org
Subject: Re: [wxPython-users] Color Problems

On Sunday 12 December 2004 00:32, Robin Dunn wrote:
> 0x00bbggrr

Ok even after changing the color=hex I get nothing. below is my code.
What's wrong I get no drawing....
John

import wx

class MainWindow(wx.Frame):
  """ This window displays a variety of GUI Widgets. """
  def __init__(self,parent,id,title):
    wx.Frame.__init__(self,parent,-1, title, size =
(800,600),style=wx.DEFAULT_FRAME_STYLE|wx.NO_FULL_REPAINT_ON_RESIZE)
    self.SetBackgroundColour(wx.WHITE)
    # Messing About with Graphics
    self.colour = "BLACK"
    self.thickness = 1
    self.linestyle = wx.SOLID
    self.pen = wx.Pen(wx.NamedColour(self.colour),
self.thickness,self.linestyle)
    self.lines =
    self.InitBuffer()

    # Resize Event
    wx.EVT_SIZE(self, self.OnSize)
    # Idle event (draws when idle to prevent multiple redraws)
    wx.EVT_IDLE(self, self.OnIdle)
    # Refresh Event
    wx.EVT_PAINT(self, self.OnPaint)
    self.Show(True)
    self.reInitBuffer = True

  def InitBuffer(self):
    """ Initialize the Bitmap used for buffering the display """
    size = self.GetClientSize()
    self.buffer = wx.EmptyBitmap(size.width, size.height)
    dc = wx.BufferedDC(None, self.buffer)
    dc.SetBackground(wx.Brush(self.GetBackgroundColour()))
    dc.Clear()
    self.DrawLines(dc)
    self.reInitBuffer = False

  def DrawLines(self, dc):
    """ Redraw all lines that have been recorded """
    dc.BeginDrawing()
    x = 214
    y = 54
    for colour, thickness, line in self.lines:
      pen = wx.Pen(wx.NamedColour(colour), thickness, self.linestyle)
      dc.SetPen(pen)
      for coords in line:
        apply(dc.DrawLine, coords)
      font = wx.Font(14, wx.ROMAN, wx.NORMAL, wx.NORMAL)
      dc.SetFont(font)
      colour = [('Red', 0x0000ff), ('Green', 0x00ff00),
('Blue',0xff0000),
('DarkRed', 0x000099), ('DarkGreen', 0x009900), ('DarkBlue',0x990000)]
      #0x00bbggrr
      for (text, col) in colour:
        thisColour = wx.ColourRGB(col)
        text = "%s: 0x%06x = (%d, %d, %d)" % (text, col,thisColour.Red(),
thisColour.Green(), thisColour.Blue())
        dc.SetTextForeground(thisColour)
        dc.DrawText(text, x, y)
        y = y + 20

      dc.EndDrawing()

  def OnSize(self, event):
    self.reInitBuffer = True

  def OnIdle(self, event):
    if self.reInitBuffer:
      self.InitBuffer()
      self.Refresh(False)

  def OnPaint(self, event):
    dc = wx.BufferedPaintDC(self, self.buffer)

class MyApp(wx.App):
  def OnInit(self):
    global frame
    frame = MainWindow(None, -1, "Color Test")
    self.SetTopWindow(frame)
    return True

app = MyApp(0)
app.MainLoop()

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