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#!/usr/bin/env python
"""
This demonstrates how to use FloatCanvas with a coordinate system where
X and Y have different scales. In the example, a user had:
X data in the range: 50e-6 to 2000e-6
Y data in the range: 0 to 50000
-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 YScaleFun(center):
"""
function that returns a scaling vector to scale y data to same range as x data
"""
# center gets ignored in this case
return np.array((5e7, 1), float)
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 = YScaleFun,
Debug = 0,
BackgroundColor = "DARK SLATE BLUE",
).Canvas
self.Canvas = Canvas
Point = np.array((50e-6, 0))
Size = np.array(( (2000e-6 - 5e-6), 50000))
Box = Canvas.AddRectangle(Point,
Size,
FillColor = "blue"
)
Canvas.AddText("%s"%(Point,), Point, Position="cr")
Canvas.AddPoint(Point, Diameter=3, Color = "red")
Point = Point + Size
Canvas.AddText("%s"%(Point,), Point, Position="cl")
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("%.2g, %.2g"%tuple(event.Coords))
app = wx.App(False)
F = DrawFrame(None, title="FloatCanvas Demo App", size=(700,700) )
app.MainLoop()
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