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#! /usr/bin/env python
import sys
import math
import pango
import cairo
import pangocairo
RADIUS = 150
def draw_text(cr):
N_WORDS = 10
FONT = "Sans Bold 27"
# Center coordinates on the middle of the region we are drawing
cr.translate(RADIUS, RADIUS);
# Create a PangoLayout, set the font and text */
layout = cr.create_layout()
layout.set_text("Text")
layout.set_font_description(pango.FontDescription(FONT))
# Draw the layout N_WORDS times in a circle
for i in range(N_WORDS):
angle = (360 * i) / N_WORDS;
cr.save()
# Gradient from red at angle == 60 to blue at angle == 300
red = (1 + math.cos((angle - 60)*math.pi/180))/2
cr.set_source_rgb(red, 0, 1 - red)
cr.rotate(angle*math.pi/180)
# Inform Pango to re-layout the text with the new transformation */
cr.update_layout(layout)
width, height = layout.get_size()
cr.move_to(-width/pango.SCALE/2, -RADIUS)
cr.show_layout(layout)
cr.restore()
def main(argv):
if len(argv) != 2:
print >> sys.stderr, "Usage: cairosimple OUTPUT_BASENAME\n"
return 1
filename = argv[1]
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 2*RADIUS, 2*RADIUS)
cr = pangocairo.CairoContext(cairo.Context(surface))
cr.set_source_rgb(1.0, 1.0, 1.0)
cr.rectangle(0, 0, 2*RADIUS, 2*RADIUS)
cr.fill()
draw_text(cr)
surface.write_to_png(filename + ".png")
## output also a PDF file
surface = cairo.PDFSurface(filename + ".pdf", 2*RADIUS, 2*RADIUS)
cr = pangocairo.CairoContext(cairo.Context(surface))
draw_text(cr)
cr.show_page()
surface.finish()
if __name__ == '__main__':
sys.exit(main(sys.argv))
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