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#!/usr/bin/python
"""
__version__ = "$Revision: 1.4 $"
__date__ = "$Date: 2005/09/18 03:59:22 $"
"""
"""
this is a direct port of the Java applet at
http://www.wordsmith.org/anu/java/spirograph.html
"""
from PythonCard import clipboard, dialog, graphic, model
import wx
import os
import random
import math
class Spirograph(model.Background):
def on_initialize(self, event):
self.filename = None
comp = self.components
self.sliderLabels = {
'stcFixedCircleRadius':comp.stcFixedCircleRadius.text,
'stcMovingCircleRadius':comp.stcMovingCircleRadius.text,
'stcMovingCircleOffset':comp.stcMovingCircleOffset.text,
'stcRevolutionsInRadians':comp.stcRevolutionsInRadians.text,
}
self.setSliderLabels()
if self.components.chkDarkCanvas.checked:
self.components.bufOff.backgroundColor = 'black'
self.components.bufOff.clear()
self.doSpirograph()
def doSpirograph(self):
comp = self.components
canvas = comp.bufOff
width, height = canvas.size
xOffset = width / 2
yOffset = height / 2
R = comp.sldFixedCircleRadius.value
r = comp.sldMovingCircleRadius.value
O = comp.sldMovingCircleOffset.value
revolutions = comp.sldRevolutionsInRadians.value
color = comp.btnColor.backgroundColor
canvas.foregroundColor = color
canvas.autoRefresh = 0
canvas.clear()
if comp.radDrawingStyle.stringSelection == 'Lines':
drawLines = 1
else:
drawLines = 0
t = 0.0
if R+r+O == 0:
# avoid divide by zero errors
s = 5.0/0.0000001
else:
s = 5.0/(R+r+O)
rSum = R + r
# avoid divide by zero errors
if r == 0:
r = 0.0000001
exprResult = (rSum * t) / r
lastX = rSum*math.cos(t) - O*math.cos(exprResult) + xOffset
lastY = rSum*math.sin(t) - O*math.sin(exprResult) + yOffset
self.keepDrawing = 1
points = []
while abs(t) <= revolutions:
exprResult = (rSum * t) / r
x = rSum*math.cos(t) - O*math.cos(exprResult) + xOffset
y = rSum*math.sin(t) - O*math.sin(exprResult) + yOffset
if drawLines:
points.append((lastX, lastY, x, y))
lastX = x
lastY = y
else:
points.append((x, y))
t += s
if drawLines:
canvas.drawLineList(points)
else:
canvas.drawPointList(points)
canvas.autoRefresh = 1
canvas.refresh()
def on_btnColor_mouseClick(self, event):
result = dialog.colorDialog(self)
if result.accepted:
self.components.bufOff.foregroundColor = result.color
event.target.backgroundColor = result.color
self.doSpirograph()
def on_select(self, event):
name = event.target.name
# only process Sliders
if name.startswith('sld'):
labelName = 'stc' + name[3:]
self.components[labelName].text = self.sliderLabels[labelName] + \
' ' + str(event.target.value)
self.doSpirograph()
def on_chkDarkCanvas_mouseClick(self, event):
if event.target.checked:
self.components.bufOff.backgroundColor = 'black'
else:
self.components.bufOff.backgroundColor = 'white'
self.doSpirograph()
def setSliderLabels(self):
comp = self.components
for key in self.sliderLabels:
sliderName = 'sld' + key[3:]
comp[key].text = self.sliderLabels[key] + ' ' + str(comp[sliderName].value)
def on_btnRandom_mouseClick(self, event):
comp = self.components
comp.sldFixedCircleRadius.value = random.randint(1, 100)
comp.sldMovingCircleRadius.value = random.randint(-50, 50)
comp.sldMovingCircleOffset.value = random.randint(1, 100)
self.setSliderLabels()
self.doSpirograph()
def openFile(self):
wildcard = "All files (*.*)|*.*"
result = dialog.openFileDialog(None, "Import which file?", '', '', wildcard)
if result.accepted:
path = result.paths[0]
os.chdir(os.path.dirname(path))
try:
self.filename = path
filename = os.path.splitext(os.path.basename(path))[0]
if filename.startswith('spiro'):
items = filename[5:].split('_')
comp = self.components
comp.sldFixedCircleRadius.value = int(items[0])
comp.sldMovingCircleRadius.value = int(items[1])
comp.sldMovingCircleOffset.value = int(items[2])
comp.btnColor.backgroundColor = eval(items[3])
comp.chkDarkCanvas.checked = int(items[4])
if items[5] == 'L':
comp.radDrawingStyle.stringSelection = 'Lines'
else:
comp.radDrawingStyle.stringSelection = 'Points'
comp.sldRevolutionsInRadians.value = int(items[6])
self.setSliderLabels()
bmp = graphic.Bitmap(self.filename)
self.components.bufOff.drawBitmap(bmp, (0, 0))
except IOError, msg:
pass
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)
comp = self.components
style = comp.radDrawingStyle.stringSelection[0]
filename = 'spiro' + str(comp.sldFixedCircleRadius.value) + '_' + \
str(comp.sldMovingCircleRadius.value) + '_' + \
str(comp.sldMovingCircleOffset.value) + '_' + \
str(comp.btnColor.backgroundColor) + '_' + \
str(comp.chkDarkCanvas.checked) + '_' + \
style + '_' + \
str(comp.sldRevolutionsInRadians.value) + \
'.png'
wildcard = "All files (*.*)|*.*"
result = dialog.saveFileDialog(None, "Save As", path, filename, wildcard)
if result.accepted:
path = result.paths[0]
fileType = graphic.bitmapType(path)
try:
bmp = self.components.bufOff.getBitmap()
bmp.SaveFile(path, fileType)
return True
except IOError, msg:
return False
else:
return False
def on_menuEditCopy_select(self, event):
clipboard.setClipboard(self.components.bufOff.getBitmap())
def on_menuEditPaste_select(self, event):
bmp = clipboard.getClipboard()
if isinstance(bmp, wx.Bitmap):
self.components.bufOff.drawBitmap(bmp)
def on_editClear_command(self, event):
self.components.bufOff.clear()
if __name__ == '__main__':
app = model.Application(Spirograph)
app.MainLoop()
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