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/OverlayDemo.py

@@ -0,0 +1,142 @@
+#!/usr/bin/env python
+
+"""
+A simple demo to show how to "Overlays": i.e. drawing something
+on top of eveything else on the Canvas, relative to window coords,
+rather than screen coords.
+
+This method uses the "GridOver" object in the FloatCanvas 
+  - it was orginally dsigend for girds, graticule,s etc. that
+    are always drawn regardless of zoom, pan, etc, but it works
+    for overlays too. 
+
+"""
+
+import wx
+
+
+try:
+    # See if there is a local copy
+    import sys
+    sys.path.append("../")
+    from floatcanvas import NavCanvas, FloatCanvas
+except ImportError:
+    from wx.lib.floatcanvas import NavCanvas, FloatCanvas
+
+class TextOverlay(FloatCanvas.Text):
+    """
+    An example of an Overlay object:
+
+    all it needs is a new _Draw method.
+    
+    NOTE: you may want to get fancier with this,
+          deriving from ScaledTextBox
+
+    """
+    def __init__(self,
+                 String,
+                 xy,
+                 Size = 24,
+                 Color = "Black",
+                 BackgroundColor = None,
+                 Family = wx.MODERN,
+                 Style = wx.NORMAL,
+                 Weight = wx.NORMAL,
+                 Underlined = False,
+                 Font = None):
+        FloatCanvas.Text.__init__(self,
+                                  String,
+                                  xy,
+                                  Size = Size,
+                                  Color = Color,
+                                  BackgroundColor = BackgroundColor,
+                                  Family = Family,
+                                  Style = Style,
+                                  Weight = Weight,
+                                  Underlined = Underlined,
+                                  Font = Font)
+
+    def _Draw(self, dc, Canvas):
+        """
+        _Draw method for Overlay
+         note: this is a differeent signarture than the DrawObject Draw
+        """
+        dc.SetFont(self.Font)
+        dc.SetTextForeground(self.Color)
+        if self.BackgroundColor:
+            dc.SetBackgroundMode(wx.SOLID)
+            dc.SetTextBackground(self.BackgroundColor)
+        else:
+            dc.SetBackgroundMode(wx.TRANSPARENT)
+        ## maybe inpliment this...
+        #if self.TextWidth is None or self.TextHeight is None:
+        #    (self.TextWidth, self.TextHeight) = dc.GetTextExtent(self.String)
+        #XY = self.ShiftFun(XY[0], XY[1], self.TextWidth, self.TextHeight)
+        dc.DrawTextPoint(self.String, self.XY)
+
+
+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 = None,
+                                     Debug = 0,
+                                     BackgroundColor = "DARK SLATE BLUE",
+                                     ).Canvas
+        
+        
+        Point = (45,40)
+        Box = Canvas.AddCircle(Point,
+                               Diameter = 10,
+                               FillColor = "Cyan",
+                               LineColor = "Red",
+                               LineWidth = 6)
+
+        Canvas.GridOver = TextOverlay("Some Text",
+                                      (20,20),
+                                      Size = 48,
+                                      Color = "Black",
+                                      BackgroundColor = 'Pink',
+                                      )
+
+        FloatCanvas.EVT_MOTION(Canvas, 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) # true to get its own output window.
+F = DrawFrame(None, title="FloatCanvas Demo App", size=(700,700) )
+app.MainLoop()
+    
+    
+    
+    
+
+
+
+
+
+
+
+
+