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import wx
import math
try:
import wx.lib.wxcairo
import cairo
haveCairo = True
except ImportError:
haveCairo = False
from Main import opj
#----------------------------------------------------------------------
class TestPanel(wx.Panel):
def __init__(self, parent, log):
self.log = log
wx.Panel.__init__(self, parent, -1)
self.Bind(wx.EVT_PAINT, self.OnPaint)
def OnPaint(self, evt):
if self.IsDoubleBuffered():
dc = wx.PaintDC(self)
else:
dc = wx.BufferedPaintDC(self)
dc.SetBackground(wx.Brush('white'))
dc.Clear()
self.Render(dc)
def Render(self, dc):
# Draw some stuff on the plain dc
sz = self.GetSize()
dc.SetPen(wx.Pen("navy", 1))
x = y = 0
while x < sz.width * 2 or y < sz.height * 2:
x += 20
y += 20
dc.DrawLine(x, 0, 0, y)
# now draw something with cairo
ctx = wx.lib.wxcairo.ContextFromDC(dc)
ctx.set_line_width(15)
ctx.move_to(125, 25)
ctx.line_to(225, 225)
ctx.rel_line_to(-200, 0)
ctx.close_path()
ctx.set_source_rgba(0, 0, 0.5, 1)
ctx.stroke()
# and something else...
ctx.arc(200, 200, 80, 0, math.pi*2)
ctx.set_source_rgba(0, 1, 1, 0.5)
ctx.fill_preserve()
ctx.set_source_rgb(1, 0.5, 0)
ctx.stroke()
# here's a gradient pattern
ptn = cairo.RadialGradient(315, 70, 25,
302, 70, 128)
ptn.add_color_stop_rgba(0, 1,1,1,1)
ptn.add_color_stop_rgba(1, 0,0,0,1)
ctx.set_source(ptn)
ctx.arc(328, 96, 75, 0, math.pi*2)
ctx.fill()
# Draw some text
face = wx.lib.wxcairo.FontFaceFromFont(
wx.FFont(10, wx.SWISS, wx.FONTFLAG_BOLD))
ctx.set_font_face(face)
ctx.set_font_size(60)
ctx.move_to(360, 180)
ctx.set_source_rgb(0, 0, 0)
ctx.show_text("Hello")
# Text as a path, with fill and stroke
ctx.move_to(400, 220)
ctx.text_path("World")
ctx.set_source_rgb(0.39, 0.07, 0.78)
ctx.fill_preserve()
ctx.set_source_rgb(0,0,0)
ctx.set_line_width(2)
ctx.stroke()
# Show iterating and modifying a (text) path
ctx.new_path()
ctx.move_to(0, 0)
ctx.set_source_rgb(0.3, 0.3, 0.3)
ctx.set_font_size(30)
text = "This path was warped..."
ctx.text_path(text)
tw, th = ctx.text_extents(text)[2:4]
self.warpPath(ctx, tw, th, 360,300)
ctx.fill()
# Drawing a bitmap. Note that we can easily load a PNG file
# into a surface, but I wanted to show how to convert from a
# wx.Bitmap here instead. This is how to do it using just cairo:
#img = cairo.ImageSurface.create_from_png(opj('bitmaps/toucan.png'))
# And this is how to convert a wx.Btmap to a cairo image
# surface. NOTE: currently on Mac there appears to be a
# problem using conversions of some types of images. They
# show up totally transparent when used. The conversion itself
# appears to be working okay, because converting back to
# wx.Bitmap or writing the image surface to a file produces
# the expected result. The other platforms are okay.
bmp = wx.Bitmap(opj('bitmaps/toucan.png'))
#bmp = wx.Bitmap(opj('bitmaps/splash.png'))
img = wx.lib.wxcairo.ImageSurfaceFromBitmap(bmp)
ctx.set_source_surface(img, 70, 230)
ctx.paint()
# this is how to convert an image surface to a wx.Bitmap
bmp2 = wx.lib.wxcairo.BitmapFromImageSurface(img)
dc.DrawBitmap(bmp2, 280, 300)
def warpPath(self, ctx, tw, th, dx, dy):
def f(x, y):
xn = x - tw/2
yn = y+ xn ** 3 / ((tw/2)**3) * 70
return xn+dx, yn+dy
path = ctx.copy_path()
ctx.new_path()
for type, points in path:
if type == cairo.PATH_MOVE_TO:
x, y = f(*points)
ctx.move_to(x, y)
elif type == cairo.PATH_LINE_TO:
x, y = f(*points)
ctx.line_to(x, y)
elif type == cairo.PATH_CURVE_TO:
x1, y1, x2, y2, x3, y3 = points
x1, y1 = f(x1, y1)
x2, y2 = f(x2, y2)
x3, y3 = f(x3, y3)
ctx.curve_to(x1, y1, x2, y2, x3, y3)
elif type == cairo.PATH_CLOSE_PATH:
ctx.close_path()
#----------------------------------------------------------------------
if not haveCairo:
from wx.lib.msgpanel import MessagePanel
def runTest(frame, nb, log):
win = MessagePanel(nb, 'This demo requires the Pycairo package,\n'
'or there is some other unmet dependency.',
'Sorry', wx.ICON_WARNING)
return win
else:
def runTest(frame, nb, log):
win = TestPanel(nb, log)
return win
#----------------------------------------------------------------------
if haveCairo:
extra = "\n<h3>wx.lib.wxcairo</h3>\n%s" % (
wx.lib.wxcairo.__doc__.replace('\n\n', '\n<p>'))
else:
extra = '\n<p>See the docstring in the wx.lib.wxcairo module for details about installing dependencies.'
overview = """<html><body>
<h2><center>Cairo Integration</center></h2>
This sample shows how to draw on a DC using the cairo 2D graphics
library and the pycairo Python extension module that wraps the cairo
API. For more information about cairo please see
http://cairographics.org/.
%s
</body></html>
""" % extra
if __name__ == '__main__':
import sys,os
import run
run.main(['', os.path.basename(sys.argv[0])] + sys.argv[1:])
|
