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#!/usr/bin/python
"""
A fractal display program using the Lindenmayer rule system to describe the fractal.
"""
__version__ = "$Revision: 1.6 $"
__date__ = "$Date: 2005/12/13 11:13:23 $"
from PythonCard import clipboard, dialog, graphic, model
from PythonCard.turtle import AbstractTurtle, BitmapTurtle
import wx
import os
import time
class LSystem(model.Background):
def on_initialize(self, event):
self.filename = None
self.on_iterations_select(None)
self.on_angle_select(None)
def on_iterations_select(self, event):
self.components.iterationDisplay.text = \
str(self.components.iterations.value)
def on_angle_select(self, event):
self.components.angleDisplay.text = \
str(self.components.angle.value)
def on_angleDisplay_textUpdate(self, event):
self.components.angle.value = \
int(self.components.angleDisplay.text)
def on_Render_command(self, event):
self.statusBar.text = "Drawing, please wait..."
starttime = time.time()
fractalString = self.expand(
self.components.scriptField.text,
self.components.iterations.value)
borderWidth = 5.0
angle = self.components.angle.value
self.components.bufOff.autoRefresh = False
bounds = drawAbstractFractal(
fractalString,
1,
angle,
(0,0))
width, height = self.components.bufOff.size
scale = min(
(width - 2 * borderWidth) / (bounds[2]-bounds[0]),
(height - 2 * borderWidth) / (bounds[3]-bounds[1]))
startPos = (bounds[0] * -scale + borderWidth,
bounds[1] * -scale + borderWidth)
self.components.bufOff.autoRefresh = True
self.drawFractal(
fractalString,
'blue',
scale,
angle,
startPos)
stoptime = time.time()
self.statusBar.text = "Draw time: %.2f seconds" % (stoptime - starttime)
def drawFractal(self, aFractalString, color, legLength, angle, startPos):
self.components.bufOff.clear()
t = BitmapTurtle(self.components.bufOff)
t.color(color)
t.lt(90)
t.moveTo(startPos[0], startPos[1])
for char in aFractalString:
if char=='F':
t.fd(legLength)
elif char=='B':
t.bk(legLength)
elif char=='+':
t.rt(angle)
elif char=='-':
t.lt(angle)
elif char=='[':
t.push()
elif char==']':
t.pop()
def expand(self, fractalRules, iterations):
lines = fractalRules.upper().split('\n')
rules = {}
for rule in lines:
name, value = rule.split('=')
assert(name=='AXIOM' or len(name)==1)
rules[name] = value
ret = rules['AXIOM']
for i in range(iterations):
l = list(ret)
for pos, char in enumerate(l):
repl = rules.get(char, None)
if repl:
l[pos] = repl
ret = ''.join(l)
return ret
def initSizers(self):
sizer1 = wx.BoxSizer(wx.VERTICAL)
comp = self.components
flags = wx.LEFT | wx.RIGHT | wx.BOTTOM | wx.ALIGN_BOTTOM
# Mac wxButton needs 7 pixels on bottom and right
macPadding = 7
sizer1.Add(comp.btnColor, 0, flags, macPadding)
sizer1.Add(comp.bufOff, 1, wx.EXPAND)
sizer1.Fit(self)
sizer1.SetSizeHints(self)
self.panel.SetSizer(sizer1)
self.panel.SetAutoLayout(1)
self.panel.Layout()
def on_btnColor_mouseClick(self, event):
result = dialog.colorDialog(self)
if result.accepted:
self.components.bufOff.foregroundColor = result.color
event.target.backgroundColor = result.color
def openFile(self):
result = dialog.openFileDialog(None, "Import which file?")
if result.accepted:
path = result.paths[0]
os.chdir(os.path.dirname(path))
self.filename = path
bmp = graphic.Bitmap(self.filename)
self.components.bufOff.drawBitmap(bmp, (0, 0))
def on_menuFileOpen_select(self, event):
self.openFile()
def on_menuFileSaveAs_select(self, event):
if self.filename is None:
path = ''
filename = ''
else:
path, filename = os.path.split(self.filename)
result = dialog.saveFileDialog(None, "Save As", path, filename)
if result.accepted:
path = result.paths[0]
fileType = graphic.bitmapType(path)
print fileType, path
bmp = self.components.bufOff.getBitmap()
try:
bmp.SaveFile(path, fileType)
return True
except IOError:
return False
else:
return False
def on_menuEditCopy_select(self, event):
widget = self.findFocus()
if hasattr(widget, 'editable') and widget.canCopy():
widget.copy()
else:
clipboard.setClipboard(self.components.bufOff.getBitmap())
def on_menuEditPaste_select(self, event):
widget = self.findFocus()
if hasattr(widget, 'editable') and widget.canPaste():
widget.paste()
else:
bmp = clipboard.getClipboard()
if isinstance(bmp, wx.Bitmap):
self.components.bufOff.drawBitmap(bmp)
def on_editClear_command(self, event):
self.components.bufOff.clear()
def drawAbstractFractal(aFractalString, legLength, angle, startPos):
def recalcBounds(bounds, turtle):
x, y = turtle.getXY()
bounds[0] = min(bounds[0], x)
bounds[1] = min(bounds[1], y)
bounds[2] = max(bounds[2], x)
bounds[3] = max(bounds[3], y)
t = AbstractTurtle((1,1))
t.lt(90)
t.moveTo(startPos[0], startPos[1])
bounds = list(startPos + startPos)
for char in aFractalString:
if char=='F':
t.fd(legLength)
recalcBounds(bounds, t)
elif char=='B':
t.bk(legLength)
recalcBounds(bounds, t)
elif char=='+':
t.rt(angle)
elif char=='-':
t.lt(angle)
elif char=='[':
t.push()
elif char==']':
t.pop()
return bounds
from PythonCard.tests import pyunit
class LSystemTests(pyunit.TestCase):
def setUp(self):
pass
def tearDown(self):
pass
def testBoundsCheckBackwardMoves(self):
bounds = drawAbstractFractal('BB+B', 1, 90, (10.0,20.0))
# remember that down is positive in this coordinate system
self.assertEqual([9.0, 20.0, 10.0, 22.0], bounds)
def testBoundsCheckForwardMoves(self):
bounds = drawAbstractFractal('FF-F', 1, 90, (10.0,20.0))
# remember that down is positive in this coordinate system
self.assertEqual([9.0, 18.0, 10.0, 20.0], bounds)
if __name__ == '__main__':
app = model.Application(LSystem)
app.MainLoop()
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