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143 lines
3.9 KiB
Python
143 lines
3.9 KiB
Python
#!/usr/bin/env python
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"""
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A simple demo to show how to "Overlays": i.e. drawing something
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on top of eveything else on the Canvas, relative to window coords,
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rather than screen coords.
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This method uses the "GridOver" object in the FloatCanvas
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- it was originally dsigend for grids, graticule,s etc. that
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are always drawn regardless of zoom, pan, etc, but it works
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for overlays too.
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"""
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import wx
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try:
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# See if there is a local copy
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import sys
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sys.path.append("../")
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from floatcanvas import NavCanvas, FloatCanvas
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except ImportError:
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from wx.lib.floatcanvas import NavCanvas, FloatCanvas
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class TextOverlay(FloatCanvas.Text):
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"""
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An example of an Overlay object:
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all it needs is a new _Draw method.
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NOTE: you may want to get fancier with this,
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deriving from ScaledTextBox
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"""
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def __init__(self,
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String,
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xy,
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Size = 24,
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Color = "Black",
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BackgroundColor = None,
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Family = wx.MODERN,
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Style = wx.NORMAL,
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Weight = wx.NORMAL,
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Underlined = False,
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Font = None):
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FloatCanvas.Text.__init__(self,
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String,
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xy,
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Size = Size,
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Color = Color,
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BackgroundColor = BackgroundColor,
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Family = Family,
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Style = Style,
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Weight = Weight,
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Underlined = Underlined,
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Font = Font)
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def _Draw(self, dc, Canvas):
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"""
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_Draw method for Overlay
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note: this is a differeent signarture than the DrawObject Draw
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"""
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dc.SetFont(self.Font)
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dc.SetTextForeground(self.Color)
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if self.BackgroundColor:
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dc.SetBackgroundMode(wx.SOLID)
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dc.SetTextBackground(self.BackgroundColor)
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else:
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dc.SetBackgroundMode(wx.TRANSPARENT)
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## maybe inpliment this...
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#if self.TextWidth is None or self.TextHeight is None:
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# (self.TextWidth, self.TextHeight) = dc.GetTextExtent(self.String)
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#XY = self.ShiftFun(XY[0], XY[1], self.TextWidth, self.TextHeight)
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dc.DrawText(self.String, self.XY)
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class DrawFrame(wx.Frame):
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"""
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A frame used for the FloatCanvas Demo
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"""
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def __init__(self, *args, **kwargs):
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wx.Frame.__init__(self, *args, **kwargs)
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self.CreateStatusBar()
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# Add the Canvas
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Canvas = NavCanvas.NavCanvas(self,-1,
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size = (500,500),
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ProjectionFun = None,
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Debug = 0,
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BackgroundColor = "DARK SLATE BLUE",
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).Canvas
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Point = (45,40)
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Box = Canvas.AddCircle(Point,
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Diameter = 10,
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FillColor = "Cyan",
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LineColor = "Red",
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LineWidth = 6)
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Canvas.GridOver = TextOverlay("Some Text",
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(20,20),
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Size = 48,
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Color = "Black",
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BackgroundColor = 'Pink',
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)
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Canvas.Bind(FloatCanvas.EVT_MOTION, self.OnMove)
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self.Show()
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Canvas.ZoomToBB()
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def OnMove(self, event):
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"""
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Updates the status bar with the world coordinates
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"""
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self.SetStatusText("%.2f, %.2f"%tuple(event.Coords))
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app = wx.App(False) # true to get its own output window.
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F = DrawFrame(None, title="FloatCanvas Demo App", size=(700,700) )
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app.MainLoop()
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