Attachment 16905 Details for Bug 16222 – pycairo testcase for incorrect pdf stroke gradient rendering

pycairo testcase for incorrect pdf stroke gradient rendering

gradient_testcase.py (text/x-python), 2.11 KB, created by Karl Ostmo on 2008-06-03 20:32:24 UTC

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Creator: Karl Ostmo

Created: 2008-06-03 20:32:24 UTC

Size: 2.11 KB

patch

obsolete

>#!/usr/bin/env python
>
>'''
>pycairo testcase for incorrect pdf stroke gradient rendering
>Written by Karl Ostmo
>June 3, 2008
>'''
>
>import pygtk
>pygtk.require('2.0')
>import gtk, cairo
>
>
>from math import pi, sqrt
>
># Create a GTK+ widget on which we will draw using Cairo
>class Screen(gtk.DrawingArea):
>
>	def __init__(self):
>		gtk.DrawingArea.__init__(self)
>
>	# =============================
>
>	# Draw in response to an expose-event
>	__gsignals__ = { "expose-event": "override" }
>
>	# =============================
>
>	# Handle the expose-event by drawing
>	def do_expose_event(self, event):
>
>		# Create the cairo context
>		cr = self.window.cairo_create()
>
>		# Restrict Cairo to the exposed area; avoid extra work
>		cr.rectangle(event.area.x, event.area.y,
>		        event.area.width, event.area.height)
>		cr.clip()
>
>		self.draw(cr, *self.window.get_size())
>
>	# =============================
>
>	def draw(self, cr, width, height):
>
>		circle_radius = min(width, height)/3.0
>		cr.translate(width/2.0, height/2.0)
>		cr.arc( 0, 0, circle_radius, 0, 2*pi)
>
>		linear_gradient = cairo.LinearGradient(0, circle_radius, 0, -circle_radius)
>		linear_gradient.add_color_stop_rgb(0, *tuple([1.0]*3) )
>		linear_gradient.add_color_stop_rgb(1, *tuple([0.0]*3) )
>		cr.set_source(linear_gradient)
>
>		cr.set_line_width( 20 )
>		cr.stroke()
>
>	# -------------
>
>	def draw_and_save_graphic(self, widget):
>
>		x, y, img_width, img_height = self.get_allocation()
>
>		filename = "gradient_testcase.pdf"
>		surf = cairo.PDFSurface(filename, img_width, img_height)
>		cr = cairo.Context(surf)
>		self.draw(cr, img_width, img_height)
>		cr.show_page()
>
>		print "Wrote", filename, "at", img_width, "x", img_height
>
># =============================
>
>def run(Widget):
>	window = gtk.Window()
>	window.connect("delete-event", gtk.main_quit)
>	widget = Widget()
>	widget.set_size_request( 100, 100 )
>	widget.show()
>
>	vbox = gtk.VBox(False)
>	window.add(vbox)
>
>	vbox.pack_start(widget, True, True)
>
>	button = gtk.Button("Save to PDF")
>	vbox.pack_start(button, False, False)
>	button.connect('clicked', widget.draw_and_save_graphic)
>
>	vbox.show_all()
>
>	window.present()
>	gtk.main()
>
>if __name__ == "__main__":
>	run(Screen)

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Attachments on bug 16222: 16905

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