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#!/usr/bin/env python
"""
This demonstrates how to use FloatCanvas with a coordinate system where
Y is increased down, instead of up. This is a standard system for
images, for instance.
Note that there are some problems with doing this for bitmaps and text: things that require positioning.
I'm sure it can be fixed, but I don't have a need for it, so I haven't taken the time yet.
-chb
"""
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
import numpy as np
def YDownProjection(CenterPoint):
return np.array((1,-1))
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 = YDownProjection,
Debug = 0,
BackgroundColor = "DARK SLATE BLUE",
).Canvas
self.Canvas = Canvas
Point = (0,0)
Box = Canvas.AddRectangle(Point,
(80,100),
FillColor = "blue"
)
Canvas.AddText("%s"%(Point,), Point, Position="cr")
Canvas.AddPoint(Point, Diameter=3, Color = "red")
Point = (0,100)
Canvas.AddText("%s"%(Point,), Point, Position="cr")
Canvas.AddPoint(Point, Diameter=3, Color = "red")
self.Canvas.Bind(FloatCanvas.EVT_MOTION, self.OnMove )
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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