"""piddletest.py

This module puts the various PIDDLE backends through their paces.
"""
from __future__ import print_function

from sping import pagesizes
from sping.pid import *
import string
import math

backends = ['PDF','PIL','TK',
		    'PS','SVG', 'WX' ] # 'piddleAI','piddleQD','piddleGL' ]
backends.sort()

#----------------------------------------------------------------------
# note, these tests do not flush() the canvas
#----------------------------------------------------------------------
def minimal(canvasClass):
	"""Just a very basic test of line drawing and canvas size."""
	canvas = canvasClass(pagesizes.A6, "test-minimal")		# A6 is a quarter page
	drawMinimal(canvas)
	return canvas

def drawMinimal(canvas):
	saver = StateSaver(canvas) # leave canvas state as you found it, restores state when leaves scope
	size = canvas.size	# (actual size *may* differ from requested size)
	canvas.defaultLineColor = green
	canvas.drawLine(1,1,size[0]-1,size[1]-1)
	canvas.drawLine(1,size[1]-1,size[0]-1,1)
	canvas.drawRect(1,1,size[0]-1,size[1]-1, edgeWidth=5)

	return canvas

#----------------------------------------------------------------------
def basics(canvasClass):
	"""A general test of most of the drawing primitives except images and strings."""
	canvas = canvasClass((300,300), "test-basics")
	return drawBasics(canvas)

def drawBasics(canvas):
	saver = StateSaver(canvas) # leave canvas state as you found it, restores state when leaves scope
	canvas.defaultLineColor = Color(0.7,0.7,1.0)	# light blue
	canvas.drawLines( map(lambda i:(i*10,0,i*10,300), range(30)) )
	canvas.drawLines( map(lambda i:(0,i*10,300,i*10), range(30)) )
	canvas.defaultLineColor = black
	
	canvas.drawLine(10,200, 20,190, color=red)
	canvas.drawEllipse( 130,30, 200,100, fillColor=yellow, edgeWidth=4 )
	
	canvas.drawArc( 130,30, 200,100, 45,50, fillColor=blue, edgeColor=navy, edgeWidth=4 )
	
	canvas.defaultLineWidth = 4
	canvas.drawRoundRect( 30,30, 100,100, fillColor=blue, edgeColor=maroon )
	canvas.drawCurve( 20,20, 100,50, 50,100, 160,160 )
	
	#canvas.drawString("This is a test!", 30,130, Font(face="times",size=16,bold=1),
	#				color=green, angle=-45)
	
	polypoints = [ (160,120), (130,190), (210,145), (110,145), (190,190) ]
	canvas.drawPolygon(polypoints, fillColor=lime, edgeColor=red, edgeWidth=3, closed=1)
	
	canvas.drawRect( 200,200,260,260, edgeColor=yellow, edgeWidth=5 )
	canvas.drawLine( 200,260,260,260, color=green, width=5 )
	canvas.drawLine( 260,200,260,260, color=red, width=5 )
	
	return canvas

#----------------------------------------------------------------------
def advanced(canvasClass):
	"""A test of figures and images."""
	canvas = canvasClass((300,300), "test-advanced")
	return drawAdvanced(canvas)

def drawAdvanced(canvas):
	saver = StateSaver(canvas) # leave canvas state as you found it, restores state when leaves scope
	figure = [
			( figureCurve, 20,20, 100,50, 50,100, 160,160 ),
			( figureLine, 200,200, 250,150 ),
			( figureArc, 50,10, 250,150, 10,90 ) ]

	canvas.drawFigure(figure, fillColor=yellow, edgeWidth=4)
		
	try:
		from PIL import Image
	except:
		canvas.drawString("PIL not available!", 20,200)
		Image = None
	
	if Image:
		img = Image.open("python.gif")
		canvas.drawImage( img, 120,50,120+32,50+64 );
		canvas.drawImage( img, 0,210,300,210+32 );

	return canvas


#----------------------------------------------------------------------
def bluefunc(x):  return 1.0 / (1.0 + math.exp(-10*(x-0.6)))
def redfunc(x): return 1.0 / (1.0 + math.exp(10*(x-0.5)))
def greenfunc(x): return 1 - pow(redfunc(x+0.2),2) - bluefunc(x-0.3)

def spectrum(canvasClass):
	canvas = canvasClass((300,300), "test-spectrum")
	return drawSpectrum(canvas)

def drawSpectrum(canvas):
	"""Generates a spectrum plot; illustrates colors and useful application."""
	saver = StateSaver(canvas) # leave canvas state as you found it, restores state when leaves scope
	def plot(f,canvas,offset=0):
		for i in range(0,100):
			x = float(i)/100
			canvas.drawLine(i*3+offset,250, i*3+offset,250-100*f(x))
	
	def genColors(n=100):
		out = [None]*n;
		for i in range(n):
			x = float(i)/n
			out[i] = Color(redfunc(x), greenfunc(x), bluefunc(x));
		return out
	

	colors = genColors(300)

	# draw a black background for the spectrum
	canvas.drawRect( 0,0,300,100, edgeColor=black, fillColor=black )

	# draw the spectrum
	for i in range(len(colors)):
		canvas.drawLine(i,20,i,80, colors[i])

	# plot the components of the spectrum
	canvas.defaultLineColor = red
	plot(redfunc, canvas)

	canvas.defaultLineColor = blue
	plot(bluefunc, canvas, 1)

	canvas.defaultLineColor = green
	plot(greenfunc, canvas, 2)
	
	return canvas

#----------------------------------------------------------------------


def strings(canvasClass):
	canvas = canvasClass( size=(400,400), name="test-strings" )
	return drawStrings(canvas)


def drawStrings(canvas):
	"""Checks font metrics, and also illustrates the standard fonts."""

	saver = StateSaver(canvas) # leave canvas state as you found it, restores state when leaves scope
	def Write(canvas, s, font, curs):
		if font: canvas.defaultFont = font
		text = s
		while text and text[-1] == '\n': text = text[:-1]
		canvas.drawString(text, x=curs[0], y=curs[1])
		if s[-1] == '\n':
			curs[0] = 10
			curs[1] = curs[1] + canvas.fontHeight() + canvas.fontDescent()
		else:
			curs[0] = curs[0] + canvas.stringWidth(s)
	
	
	def StandardFonts(canvas, Write):
		canvas.defaultLineColor = black
		curs = [10,70]
		for size in (12, 18):
			for fontname in ("times", "courier", "helvetica", "symbol",
							"monospaced", "serif", "sansserif"):			
				curs[0] = 10
				curs[1] = curs[1] + size*1.5
				Write(canvas, "%s %d " % (fontname,size), Font(face=fontname, size=size), curs)
				Write(canvas, "bold ", Font(face=fontname, size=size, bold=1), curs)
				Write(canvas, "italic ", Font(face=fontname, size=size, italic=1), curs)
				Write(canvas, "underline", Font(face=fontname, size=size, underline=1), curs)
	
	CenterAndBox(canvas, "spam, spam, spam, baked beans, and spam!")
	StandardFonts(canvas, Write)
	return canvas

def CenterAndBox(canvas, s, cx=200, y=40):
	"tests string positioning, stringWidth, fontAscent, and fontDescent"
	canvas.drawLine(cx,y-30, cx,y+30, color=yellow)
	w = canvas
	w = canvas.stringWidth(s)

	canvas.drawLine(cx-w/2, y, cx+w/2, y, color=red)
	canvas.drawString(s, cx-w/2, y )
	canvas.defaultLineColor = Color(0.7,0.7,1.0)	# light blue
	canvas.drawLine(cx-w/2, y-20, cx-w/2, y+20)	# left
	canvas.drawLine(cx+w/2, y-20, cx+w/2, y+20)	# right
	asc, desc = canvas.fontAscent(), canvas.fontDescent()
	canvas.drawLine(cx-w/2-20, y-asc, cx+w/2+20, y-asc)		# top
	canvas.drawLine(cx-w/2-20, y+desc, cx+w/2+20, y+desc)	# bottom


#----------------------------------------------------------------------
def rotstring(canvasClass):
	canvas = canvasClass( (450,300), name='test-rotstring' )
	return drawRotstring(canvas)

def drawRotstring(canvas):
	"""Draws rotated strings."""
	saver = StateSaver(canvas) # leave canvas state as you found it, restores state when leaves scope
	canvas.defaultFont = Font(bold=1)
	
	canvas.defaultLineColor = (blue + white)/2
	canvas.drawLine(0,150, 300,150)
	canvas.drawLine(150,0, 150,300)
	
	s = " __albatros at "
	w = canvas.stringWidth(s)
	canvas.drawEllipse(150-w,150-w, 150+w, 150+w, fillColor=transparent)
	
	colors = [red,orange,yellow,green,blue,purple]
	cnum = 0
	for ang in range(0, 359, 30):
		canvas.defaultLineColor = colors[cnum]
		s2 = s + str(ang)
		canvas.drawString(s2, 150, 150, angle=ang)
		cnum = (cnum+1) % len(colors)

	canvas.drawString( "This is  a\nrotated\nmulti-line string!!!", 350, 100, angle= -90, font=Font(underline=1) )
	#canvas.drawString( "This is  a\nrotated\nmulti-line string!!!", 400, 175, angle= -45, font=Font(underline=1) )
	return canvas

#----------------------------------------------------------------------
#----------------------------------------------------------------------
def tkTest(testfunc):
	# TK tests are called from here because need TK's event loop
	try :
		import sping.TK
		import Tkinter
	except:
		print("A module needed for sping.TK is not available, select another backend")
		return

	root = Tkinter.Tk()
	frame = Tkinter.Frame(root)  # label='piddletestTK'

	# try new Tk canvas
	tkcanvas = sping.TK.TKCanvas(size=(400,400), name='sping-testTK', master = frame)
	bframe = Tkinter.Frame(root)

	minimalB=Tkinter.Button(bframe, text='minimal test',
				command= lambda c=tkcanvas : (c.clear(),drawMinimal(c), c.flush())).pack(side=Tkinter.LEFT)
	basicB = Tkinter.Button(bframe, text='basic test',
				command= lambda c=tkcanvas: (c.clear(),drawBasics(c),c.flush()) ).pack(side=Tkinter.LEFT)
	spectB =Tkinter.Button(bframe, text='spectrum test',
			       command= lambda c=tkcanvas: (c.clear(),drawSpectrum(c),c.flush()) ).pack(side=Tkinter.LEFT)
	stringsB = Tkinter.Button(bframe, text='strings test',
				  command= lambda c=tkcanvas:(c.clear(),drawStrings(c),c.flush()) ).pack(side=Tkinter.LEFT)
	rotstrB = Tkinter.Button(bframe, text='rotated strings test',
				 command= lambda c=tkcanvas:(c.clear(), drawRotstring(c),c.flush()) ).pack(side=Tkinter.LEFT)
	advancedB = Tkinter.Button(bframe, text='advanced test',
				   command= lambda c=tkcanvas:(c.clear(), drawAdvanced(c),c.flush() ) ).pack(side=Tkinter.LEFT)
	bframe.pack(side=Tkinter.TOP)
	tkcanvas.pack()
	frame.pack()
	# try to draw before running mainloop
	if testfunc== minimal:
		drawMinimal(tkcanvas)
	elif testfunc == basics:
		drawBasics(tkcanvas)
	elif testfunc == advanced :
		drawAdvanced(tkcanvas)
	elif testfunc == spectrum :
		drawSpectrum(tkcanvas)
	elif testfunc == strings :
		drawStrings(tkcanvas)
	elif testfunc == rotstring :
		drawRotstring(tkcanvas)
	else :
		print("Illegal testfunc handed to tkTest")
		raise ValueError("Unsupported testfunc")

	tkcanvas.flush() 
	root.mainloop()

#----------------------------------------------------------------------
def wxTest(testfunc):
	try :
		import sping.WX
		from wxPython.wx import wxApp
	except:
		print("A module needed for sping.WX is not available, select another backend")
		return

	global wx_app
	if not globals().has_key("wx_app"):
		class CanvasApp(wxApp):
			"The wxApp that runs canvas.  Initializes windows, and handles redrawing"
			def OnInit(self):
				return 1

		wx_app = CanvasApp(0)

	# run the test, passing the canvas class and returning the canvas
	canvas = testfunc(sping.WX.WXCanvas)
	
	canvas.flush()

	# Run the main loop
	wx_app.MainLoop()


def runtest(backend, testfunc):

	# special cases:
	if backend=='TK':
		tkTest(testfunc) # takes care of import, etc.
		return

	if backend=='WX':
		wxTest(testfunc) # takes care of import, etc.
		return

	# import the relevant module		
	modname = 'sping.' + backend
	print("importing ", modname)
	module = __import__('sping.'+backend, globals(), locals(), [backend])
	
	# figure out the canvas class name (e.g., "PILCanvas") and get that
	#canvasClass = getattr(module, backend[6:]+"Canvas")
	#canvasClass = getattr(module, backend+"Canvas")
	# from spam.ham import eggs
	# __import('spam.ham', 'globals(), local
	
	canvasClass = getattr(module, backend+"Canvas")
	
	# run the test, passing the canvas class and returning the canvas
	canvas = testfunc(canvasClass)
	
	# do post-test cleanup
	canvas.flush()
	# handle save's here
	if backend == 'PIL':
		# I'm saving twice because sometimes jpeg doesn't work when png does
		canvas.save(file=canvas.name+".jpg")	# save as a jpeg file
		canvas.save(format='png')		# save as a png file
	elif backend == 'piddleVCR':
		filename = canvas.name + ".vcr"
		canvas.save(filename)
		print(filename, "saved")
	else:	  # if backend == 'PS' or backend== 'PDF':
		canvas.save()  # should be "pass'ed" by Canvas's that don't use save


def mainLoop():
	global tests, backends
	backend = None
	test = None

	while 1:
		# print backends on left, tests on right, indicate chosen one of each
		i = 0
		while i < len(backends) or i < len(tests):
			try: bstr = str(i+1) + '. ' + backends[i]
			except: bstr = ''
			try: tstr = chr(65+i) + '. ' + tests[i].__name__
			except: tstr = ''
			if i == backend: bflag = '==>'
			else: bflag = ''
			if i == test: tflag = '==>'
			else: tflag = ''
			print("%10s %-20s %10s %-20s" % (bflag, bstr, tflag, tstr))
			i = i+1		
		print()
		
		inp = raw_input("Selection (0 to exit): ")
		print()

		if inp == '0': return
		if inp:
			testinp = ''
			if inp[-1] in string.letters: testinp = inp[-1]
			elif inp[0] in string.letters: testinp = inp[0]
			backinp = string.join(filter(lambda x:x in '0123456789',inp))
			if backinp:
				backend = int(backinp)-1
				if backend < len(backends):
					docstr = __import__('sping.'+backends[backend], globals(), locals(), backends[backend]).__doc__
					#docstr = __import__('sping.'+backends[backend]).__doc__
					if docstr: print(docstr)
					else: print("<no doc string>")
				else: backend = None
			if testinp:
				test = ord(string.upper(testinp[0])) - ord('A')
				if test >= 0 and test < len(tests):
					docstr = tests[test].__doc__
					if docstr:
					  print(docstr)
				else: test = None
		print
		
		# now, if we have a valid backend and test, run it
		if backend != None and test != None:
			runtest(backends[backend], tests[test])
		

tests = (minimal, basics, advanced, spectrum, strings, rotstring)

if __name__=='__main__':
	mainLoop()
