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#!/usr/bin/env python
"""
This is a small demo, showing how to make an object that can be moved around.
"""
import wx
#ver = 'local'
ver = 'installed'
if ver == 'installed': ## import the installed version
from wx.lib.floatcanvas import NavCanvas, Resources
from wx.lib.floatcanvas import FloatCanvas as FC
print("using installed version: %s" % wx.lib.floatcanvas.__version__)
elif ver == 'local':
## import a local version
import sys
sys.path.append("..")
from floatcanvas import NavCanvas, Resources
from floatcanvas import FloatCanvas as FC
import numpy as np
## here we create a new DrawObject:
## code borrowed and adapted from Werner Bruhin
class ShapeMixin:
"""
just here for added features later
"""
def __init__(self):
pass
class TriangleShape1(FC.Polygon, ShapeMixin):
def __init__(self, XY, L):
"""
An equilateral triangle object
XY is the middle of the triangle
L is the length of one side of the Triangle
"""
XY = np.asarray(XY)
XY.shape = (2,)
Points = self.CompPoints(XY, L)
FC.Polygon.__init__(self, Points,
LineColor = "Black",
LineStyle = "Solid",
LineWidth = 2,
FillColor = "Red",
FillStyle = "Solid")
ShapeMixin.__init__(self)
def CompPoints(self, XY, L):
c = L/ np.sqrt(3)
Points = np.array(((0, c),
( L/2.0, -c/2.0),
(-L/2.0, -c/2.0)),
np.float64)
Points += XY
return Points
class DrawFrame(wx.Frame):
"""
A frame used for the FloatCanvas Demo
"""
def __init__(self,parent, id,title,position,size):
wx.Frame.__init__(self,parent, id,title,position, size)
self.CreateStatusBar()
# Add the Canvas
Canvas = NavCanvas.NavCanvas(self,-1,(500,500),
ProjectionFun = None,
Debug = 0,
BackgroundColor = "DARK SLATE BLUE",
).Canvas
self.Canvas = Canvas
Canvas.Bind(FC.EVT_MOTION, self.OnMove )
Canvas.Bind(FC.EVT_LEFT_UP, self.OnLeftUp )
Canvas.AddRectangle((-5,-5),
(10,10),
LineColor = "Red",
LineStyle = "Solid",
LineWidth = 2,
FillColor = "CYAN",
FillStyle = "Solid")
Points = np.array(((0,0),
(1,0),
(0.5, 1)),
np.float64)
data = (( (0,0), 1),
( (3,3), 2),
( (-2,3), 2.5 ),
)
for p, L in data:
Tri = TriangleShape1(p, 1)
Canvas.AddObject(Tri)
Tri.Bind(FC.EVT_FC_LEFT_DOWN, self.TriHit)
self.MoveTri = None
self.Show(True)
self.Canvas.ZoomToBB()
self.Moving = False
def TriHit(self, object):
print("In TriHit")
if not self.Moving:
self.Moving = True
self.StartPoint = object.HitCoordsPixel
self.StartTri = self.Canvas.WorldToPixel(object.Points)
self.MoveTri = None
self.MovingTri = object
def OnMove(self, event):
"""
Updates the status bar with the world coordinates
And moves the triangle it it is clicked on
"""
self.SetStatusText("%.4f, %.4f"%tuple(event.Coords))
if self.Moving:
dxy = event.GetPosition() - self.StartPoint
# Draw the Moving Triangle:
dc = wx.ClientDC(self.Canvas)
dc.SetPen(wx.Pen('WHITE', 2, wx.SHORT_DASH))
dc.SetBrush(wx.TRANSPARENT_BRUSH)
dc.SetLogicalFunction(wx.XOR)
if self.MoveTri is not None:
dc.DrawPolygon(self.MoveTri)
self.MoveTri = self.StartTri + dxy
dc.DrawPolygon(self.MoveTri)
def OnLeftUp(self, event):
if self.Moving:
self.Moving = False
if self.MoveTri is not None:
dxy = event.GetPosition() - self.StartPoint
dxy = self.Canvas.ScalePixelToWorld(dxy)
self.MovingTri.Move(dxy) ## The Move function has just been added
## to the FloatCanvas PointsObject
## It does the next three lines for you.
#self.Tri.Points += dxy
#self.Tri.BoundingBox += dxy
#self.Canvas.BoundingBoxDirty = True
self.MoveTri = None
self.Canvas.Draw(True)
if __name__ == "__main__":
app = wx.App(0)
x = DrawFrame(None, -1, "FloatCanvas TextBox Test App", wx.DefaultPosition, (700,700) )
x.Show()
app.MainLoop()
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