Add the FloatCanvas demo modules

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@73860 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/floatcanvas/ScaleDemo.py

@@ -0,0 +1,100 @@
+#!/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 N
+
+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 N.array((5e7, 1), N.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 = N.array((50e-6, 0))
+        Size = N.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")
+        
+        FloatCanvas.EVT_MOTION(self.Canvas, 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()
+    
+    
+    
+    
+
+
+
+
+
+
+
+
+