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#!/usr/bin/env python
"""
A test of some simple animation
this is very old-style code: don't imitate it!
"""
import wx
import numpy as np
## import local version:
import sys
#ver = 'local'
ver = 'installed'
if ver == 'installed': ## import the installed version
from wx.lib.floatcanvas import NavCanvas
from wx.lib.floatcanvas import FloatCanvas
print("using installed version:", wx.lib.floatcanvas.__version__)
elif ver == 'local':
## import a local version
import sys
sys.path.append("..")
from floatcanvas import NavCanvas
from floatcanvas import FloatCanvas
FC = FloatCanvas
class MovingObjectMixin: # Borrowed from MovingElements.py
"""
Methods required for a Moving object
"""
def GetOutlinePoints(self):
BB = self.BoundingBox
OutlinePoints = np.array( ( (BB[0,0], BB[0,1]),
(BB[0,0], BB[1,1]),
(BB[1,0], BB[1,1]),
(BB[1,0], BB[0,1]),
)
)
return OutlinePoints
class Ball(MovingObjectMixin, FloatCanvas.Circle):
def __init__(self, XY, Velocity, Radius=2.0, **kwargs):
self.Velocity = np.asarray(Velocity, float).reshape((2,))
self.Radius = Radius
self.Moving = False
FloatCanvas.Circle.__init__(self, XY, Diameter=Radius*2, FillColor="red", **kwargs)
class DrawFrame(wx.Frame):
def __init__(self, *args, **kwargs):
wx.Frame.__init__(self, *args, **kwargs)
## Set up the MenuBar
MenuBar = wx.MenuBar()
file_menu = wx.Menu()
item = file_menu.Append(wx.ID_EXIT, "","Terminate the program")
self.Bind(wx.EVT_MENU, self.OnQuit, item)
MenuBar.Append(file_menu, "&File")
self.SetMenuBar(MenuBar)
self.CreateStatusBar()
self.SetStatusText("")
self.Bind(wx.EVT_CLOSE, self.OnCloseWindow)
# Add the buttons
ResetButton = wx.Button(self, label="Reset")
ResetButton.Bind(wx.EVT_BUTTON, self.OnReset)
StartButton = wx.Button(self, label="Start")
StartButton.Bind(wx.EVT_BUTTON, self.OnStart)
StopButton = wx.Button(self, label="Stop")
StopButton.Bind(wx.EVT_BUTTON, self.OnStop)
butSizer = wx.BoxSizer(wx.HORIZONTAL)
butSizer.Add(StartButton, 0, wx.RIGHT, 5 )
butSizer.Add(ResetButton, 0, wx.RIGHT, 5)
butSizer.Add(StopButton, 0, )
# Add the Canvas
NC = NavCanvas.NavCanvas(self, -1, (500,500),
Debug = False,
BackgroundColor = "BLUE")
self.Canvas = NC.Canvas
self.Initialize(None)
# lay it out:
S = wx.BoxSizer(wx.VERTICAL)
S.Add(butSizer, 0, wx.ALIGN_CENTER | wx.ALL, 5)
S.Add(NC, 1, wx.EXPAND)
self.SetSizer(S)
self.timer = wx.Timer(self)
self.Bind(wx.EVT_TIMER, self.MoveBall, self.timer)
self.Show(True)
def OnQuit(self,event):
self.timer.Stop()
self.Close(True)
def OnCloseWindow(self, event):
self.Destroy()
def Initialize(self, event=None):
Canvas = self.Canvas
#Add the floor
Canvas.AddLine(( (0, 0), (100, 0) ), LineWidth=4, LineColor="Black")
# add the wall:
Canvas.AddRectangle( (0,0), (10,50), FillColor='green')
# add the ball:
self.Ball = Ball( (5, 52), (2, 0), InForeground=True )
Canvas.AddObject( self.Ball )
# to capture the mouse to move the ball
self.Ball.Bind(FC.EVT_FC_LEFT_DOWN, self.BallHit)
Canvas.Bind(FC.EVT_MOTION, self.OnMove )
Canvas.Bind(FC.EVT_LEFT_UP, self.OnLeftUp )
wx.CallAfter(Canvas.ZoomToBB)
def BallHit(self, object):
print("the ball was clicked")
self.Ball.Moving = True
def OnMove(self, event):
"""
Updates the status bar with the world coordinates
and moves the object it is clicked on
"""
self.SetStatusText("%.4f, %.4f"%tuple(event.Coords))
if self.Ball.Moving:
self.Ball.SetPoint(event.Coords)
self.Canvas.Draw(True)
def OnLeftUp(self, event):
self.Ball.Moving = False
def OnReset(self, event=None):
self.Ball.SetPoint( (5, 52) )
self.Ball.Velocity = np.array((1.5, 0.0))
self.Canvas.Draw(True)
def OnStart(self, event=None):
self.timer.Start(20)
def OnStop(self, event=None):
self.timer.Stop()
def MoveBall(self, event=None):
ball = self.Ball
dt = .1
g = 9.806
m = 1
A = np.pi*(ball.Radius/100)**2 # radius in cm
Cd = 0.47
rho = 1.3
if not ball.Moving: # don't do this if the user is moving it
vel = ball.Velocity
pos = ball.XY
# apply drag
vel -= np.sign(vel) * ((0.5 * Cd * rho * A * vel**2) / m * dt)
# apply gravity
vel[1] -= g * dt
# move the ball
pos += dt * vel
# check if it's on the wall
if pos[1] <= 52. and pos[0] <= 10.:
#reverse velocity
vel[1] *= -1.0
pos[1] = 52.
# check if it's hit the floor
elif pos[1] <= ball.Radius:
#reverse velocity
vel[1] *= -1.0
pos[1] = ball.Radius
self.Ball.SetPoint( pos )
self.Canvas.Draw(True)
wx.GetApp().Yield(onlyIfNeeded=True)
class DemoApp(wx.App):
def OnInit(self):
frame = DrawFrame(None, -1, "Simple Drawing Window",wx.DefaultPosition, (700,700) )
self.SetTopWindow(frame)
return True
if __name__ == "__main__":
app = DemoApp(0)
app.MainLoop()
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