Thanks for gracious comments sir here is my code when i draw a rectangle
and upon zoomin or zoomout everything on canvas disappears and please
add code for how to undo last drawn shape.
Farrukh
On 08-May-14 11:08 PM, Chris Barker wrote:
Hi,
I've cc'd this to the mailing list -- please keep questions there so
others can benefit from the answers.
http://mail.paulmcnett.com/cgi-bin/mailman/listinfo/floatcanvas
On Thu, May 8, 2014 at 3:42 AM, Farrukh <[email protected]
<mailto:[email protected]>> wrote:
1- I am using "FloatCanvas.FloatCanvas(self.panel)" and when i
"self.canvas.Zoom(1.1)" or "self.canvas.Zoom(0.9)" all of my drawn
shapes disappear.
That _should_ work -- you might try calling FloatCanvas.Draw() to make
sure it re-draws. If that doesn't work, something else is up. post a
small example and we can figure it out.
Also check out the Demos in the source:
http://svn.wxwidgets.org/viewvc/wx/wxPython/3rdParty/FloatCanvas/Demos/
maybe one of them will show you what you need to do.
2- "self.dc = wx.ClientDC(self.canvas)" works fine but i cant undo
last drawn shape, i have searched but couldn't implement anything,
i tried memorydc but nothing.
you shouldn't need to do anything by hand with the DC -- if you do,
it's likely to get confused with what the Canvas is doing...
3- i also need edit drawn shape after a while user feels to change
any shape in terms of color, line style line thickness, fill color.
you should be able to make any change, then call Draw() again, and the
change should be reflected. See the example in the main demo, and some
in that pile of small Demos.
-Chris
if possible please can include these in a simple program so i can
understand better. I will be greatfull for your help. eagerly
waiting for reply.
Farrukh
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import wx, os, sys, os.path, math
from wx.lib.floatcanvas import NavCanvas, FloatCanvas, Resources, Utilities,
GUIMode
from wx.lib.floatcanvas.Utilities import GUI
import wx.lib.scrolledpanel as scrolled
try:
from agw import pybusyinfo as PBI
except ImportError: # if it's not there locally, try the wxPython lib.
import wx.lib.agw.pybusyinfo as PBI
#USE_BUFFERED_DC = False
USE_BUFFERED_DC = False
class Example(wx.Frame):
def __init__(self, parent, title, size):
style=( wx.MINIMIZE_BOX | wx.MAXIMIZE_BOX | wx.SYSTEM_MENU |
wx.CLOSE_BOX | wx.CAPTION | wx.CLIP_CHILDREN )
wx.Frame.__init__(self, parent, title=title, size=size, style =
style) # pos is not working in this statement.
self.Centre()
self.toppanel = wx.Panel(self)
self.cpanel = wx.ScrolledWindow(self)
self.maxVirtualWidth = 1000
self.maxVirtualHeight = 1000
self.cpanel.SetVirtualSize((self.maxVirtualWidth,
self.maxVirtualHeight))
self.cpanel.SetScrollRate(20,20)
self.penclr = wx.Colour(0, 255, 255, 128)
self.brushclr = wx.Colour(3, 2, 255, 240)
self.detailpenclr = wx.Colour(255, 0, 0, 128)
self.detailbrushclr = wx.Colour(252, 253, 0, 240)
self.r = 255
self.g = 0
self.b = 0
self.thickness = 2
self.linetype = wx.SHORT_DASH
self.Tol = 2
self.Drawing = False
self.RBRect = None
self.Rects = []
self.toppanel.SetBackgroundColour( ( 223, 235, 247 ) )
# LIGHT GRAY, LIGHT STEEL BLUE, WHEAT
w, h = self.cpanel.GetSize()
#self.Bind(wx.EVT_PAINT, self.OnPaint)
#NC = NavCanvas.NavCanvas(self.cpanel, size=(-1,-1),
ProjectionFun = None, Debug = 0)
#self.cpanel.tb = NC.ToolBar
#self.cpanel.tb.AddSeparator()
#self.cpanel.tb.Realize()
NC = FloatCanvas.FloatCanvas(self.cpanel)
self.canvas = NC
if USE_BUFFERED_DC:
self.buffer = wx.EmptyBitmap(w, h)
self.dc = wx.BufferedPaintDC(None, self.buffer,
style=wx.BUFFER_VIRTUAL_AREA)
elif False:
self.buffer = wx.EmptyBitmap(w, h)
self.dc = wx.BufferedDC(None, self.buffer)
elif False:
self.cdc = wx.ClientDC(self.canvas)
bmp = wx.EmptyBitmap(w, h)
memDC = wx.MemoryDC()
memDC.SelectObject(bmp)
memDC.Blit( 0, 0, w, h, self.cdc, 0, 0 )
memDC.SelectObject(wx.NullBitmap)
self.dc = memDC
else:
self.dc = wx.ClientDC(self.canvas)
self.canvas.MinScale = 0.2
self.canvas.MaxScale = 2.4
self.canvas.Bind(FloatCanvas.EVT_MOTION, self.OnMove)
self.canvas.Bind(FloatCanvas.EVT_LEFT_DOWN, self.OnDown)
self.canvas.Bind(FloatCanvas.EVT_LEFT_UP, self.OnUp)
self.timer = wx.Timer(self)
self.toppanel.zoomin = wx.Button(self.toppanel, label='+',
pos=(190, 2), size=(40, 25))
self.toppanel.Bind(wx.EVT_BUTTON, self.ZoomIn,
self.toppanel.zoomin)
self.toppanel.zoomout = wx.Button(self.toppanel, label='-',
pos=(240, 2), size=(40, 25))
self.toppanel.Bind(wx.EVT_BUTTON, self.ZoomOut,
self.toppanel.zoomout)
canvas_sizer = wx.BoxSizer(wx.HORIZONTAL)
canvas_sizer.Add(self.canvas, 1, wx.EXPAND | wx.ALIGN_CENTRE |
wx.ALL, border=0)
self.cpanel.SetSizer(canvas_sizer)
sizer = wx.BoxSizer(wx.VERTICAL)
sizer.Add(self.toppanel, 1, wx.EXPAND | wx.ALIGN_TOP)
sizer.Add(self.cpanel, 19, wx.EXPAND | wx.ALIGN_CENTRE |
wx.ALL, border=25)
#self.SetAutoLayout(True)
self.SetSizer(sizer)
self.statusbar = self.CreateStatusBar(2, wx.ST_SIZEGRIP)
self.statusbar.SetStatusWidths([-4, -1])
self.statusbar.SetStatusText('Ready', 0)
self.statusbar.SetStatusText('Float Canvas', 1)
def NewRect(self, rect):
self.Rects.append(self.canvas.AddRectangle(*rect, LineWidth=2))
self.canvas.Draw(True)
def OnMove(self, e):
upx, upy = e.GetPosition()
self.statusbar.SetStatusText('x:'+str(upx)+' y:'+str(upy),1)
if self.Drawing:
x, y = self.StartPoint
Cornerx, Cornery = e.GetPosition()
w, h = ( Cornerx - x, Cornery - y)
self.pt1x = x
self.pt1y = y
self.statusbar.SetStatusText('Left_Down
x:'+str(self.pt1x)+' y:'+str(self.pt1y)+ ' -- Left_Down x:'+str(Cornerx)+'
y:'+str(Cornery),0)
if abs(w) > self.Tol and abs(h) > self.Tol:
# draw the RB box
self.dc.SetPen(wx.Pen(self.penclr,
self.thickness, self.linetype))
self.dc.SetBrush(wx.Brush(self.brushclr))
self.dc.SetLogicalFunction(wx.XOR)
if self.RBRect:
self.dc.DrawRectanglePointSize(*self.RBRect)
self.RBRect = ( (self.pt1x,self.pt1y), (w, h) )
self.dc.DrawRectanglePointSize(*self.RBRect)
def OnDown(self, e):
self.canvas.SetCursor(wx.StockCursor(wx.CURSOR_PENCIL)) #
change default + cursor to pencil
# Start drawing
self.Drawing = True
self.StartPoint = e.GetPosition()
x, y = self.StartPoint
e.Skip()
def OnUp(self, e):
self.canvas.SetCursor(wx.StockCursor(wx.CURSOR_ARROW)) # change
default + cursor to pencil
# Stop Drawing
if self.Drawing:
self.Drawing = False
self.RBRect = None
def ZoomIn(self, e):
self.canvas.Zoom(1.1)
self.canvas.Draw()
e.Skip()
def ZoomOut(self, e):
self.canvas.Zoom(0.9)
self.canvas.Draw()
e.Skip()
if __name__ == '__main__':
app = wx.App()
Example(None, 'Float Canvas', size=(800, 660)).Show()
app.MainLoop()_______________________________________________
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