Hi all,
Jamie Bullock wrote:
Does anyone have any code for drawing a circle (or other shape) on the
canvas with the mouse by clicking, 'dragging out' the radius, and then
releasing.
This, and the question from David Poundall inspired me to finally start
working on a good clean way to do this sort of thing. Enclosed is what
I've come up with -- a GUI mode for creating Circles.
I've only just begun, but I think I like the way it's working out, and
could be a good design for editing stuff on a FloatCanvas in general.
Fire it up and try clicking and dragging.
Comments welcome.
-Chris
PS: it's in SVN under Tests/EditingModes.py
--
Christopher Barker, Ph.D.
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#!/usr/bin/env python
"""
A test of the Editing Mode
"""
import wx
app = wx.PySimpleApp()
## import the installed version
#from wx.lib.floatcanvas import NavCanvas, FloatCanvas
## import the local version
import sys
sys.path.append("..")
from floatcanvas import NavCanvas, FloatCanvas, GUIMode
import numpy as N
class CreateCircleMode(GUIMode.GUIBase):
def __init__(self, parent, Properties):
GUIMode.GUIBase.__init__(self, parent)
self.Properties = Properties
self.Center = None
self.PrevCircle = None
def OnLeftDown(self, event):
# start a new circle
self.Center = N.array(event.GetPosition(), N.float)
print "mouse clicked at:", self.Center
def OnMove(self, event):
# always raise the move event
self.parent._RaiseMouseEvent(event,FloatCanvas.EVT_FC_MOTION)
if event.Dragging() and event.LeftIsDown() and not (self.Center is None):
Point = N.array(event.GetPosition(), N.float)
distance = Point-self.Center
Radius = N.hypot(distance[0], distance[1])
dc = wx.ClientDC(self.parent)
dc.SetPen(wx.Pen('WHITE', 2, wx.SHORT_DASH))
dc.SetBrush(wx.TRANSPARENT_BRUSH)
dc.SetLogicalFunction(wx.XOR)
if self.PrevCircle is not None:
dc.DrawCirclePoint(*self.PrevCircle)
self.PrevCircle = ( self.Center, Radius )
dc.DrawCirclePoint( *self.PrevCircle )
def OnLeftUp(self, event):
if self.Center is not None:
Point = N.array(event.GetPosition(), N.float)
distance = Point-self.Center
Radius = N.hypot(distance[0], distance[1])
Center = self.parent.PixelToWorld(self.Center)
Diameter = 2 * self.parent.ScalePixelToWorld((Radius, Radius))[0]
if Diameter > 0:
self.parent.AddCircle(Center,
Diameter,
**self.Properties)
self.Center = None
self.PrevCircle = None
self.parent.Draw()
class DrawFrame(wx.Frame):
"""
A frame used for the FloatCanvas Demo
"""
def __init__(self,parent, id,title,position,size):
wx.Frame.__init__(self,parent, id,title,position, size)
# Add the Canvas
self.CreateStatusBar()
Canvas = NavCanvas.NavCanvas(self,#-1,(500,500),
ProjectionFun = None,
Debug = 0,
BackgroundColor = "DARK SLATE BLUE",
).Canvas
self.Canvas = Canvas
FloatCanvas.EVT_MOTION(self.Canvas, self.OnMove )
Point = (45,40)
Circle = Canvas.AddCircle(Point, 10,
FillColor = "Black",
LineColor = "Red",
)
self.Show(True)
self.Canvas.ZoomToBB()
Properties = {"FillColor":"Red",
"LineColor":"Purple",
"LineWidth":3,
}
self.Canvas.SetMode(CreateCircleMode(self.Canvas, Properties) )
return None
def OnMove(self, event):
"""
Updates the status bar with the world coordinates
"""
self.SetStatusText("%.2f, %.2f"%tuple(event.Coords))
DrawFrame(None, -1, "FloatCanvas Demo App", wx.DefaultPosition, (700,700) )
app.MainLoop()
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