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/1_shapes/basic_shapes.py
import cairo
import math
def draw_png(filename):
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 512, 256)
c = cairo.Context(surface)
# background
c.set_source_rgb(1,1,1)
c.paint()
# lines
c.set_source_rgb(0,0,0)
c.move_to(50, 100)
c.line_to(100, 150)
c.rel_line_to(150, -100)
c.rel_move_to(-10, -10)
c.rel_line_to(20, 20)
c.set_line_width(2)
c.stroke()
# rectangles
c.set_line_width(6)
c.rectangle(300, 50, 100, 50)
c.stroke()
# arcs
c.set_source_rgb(1,0,1)
# x, y, radius, start_angle, stop_angle
c.arc(200, 180, 40, 0, 2*math.pi)
c.fill_preserve()
c.set_line_width(2)
c.set_source_rgb(0,0,0)
c.stroke()
surface.write_to_png(filename)
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/1_shapes/bezier_curve.py
import cairo
import math
def draw_png(filename):
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 512, 256)
c = cairo.Context(surface)
x0, y0 = 50, 50
x1, y1 = 180, 220
x2, y2 = 350, 180
x3, y3 = 400, 50
c.move_to(x0, y0)
c.curve_to(x1, y1, x2, y2, x3, y3)
c.stroke()
for x,y in [(x0, y0), (x1, y1), (x2, y2), (x3, y3)]:
c.arc(x-2, y-2, 4, 0, 2*math.pi)
c.stroke()
surface.write_to_png(filename)
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/1_shapes/dashed_lines.py
import cairo
def draw_png(filename):
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 512, 300)
c = cairo.Context(surface)
c.set_line_width(5)
c.set_source_rgb(0,0,0)
# 15 drawn, 10 not drawn, etc
c.set_dash([15, 10])
c.move_to(50, 50)
c.line_to(400, 50)
c.stroke()
# 10 drawn, 30 not drawn, 5 drawn, then
# 10 *not* drawn, 30 drawn, 5 not drawn, etc
c.set_dash([10, 30, 5])
c.move_to(50, 100)
c.line_to(400, 100)
c.stroke()
surface.write_to_png(filename)
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/1_shapes/line_join_line_cap.py
import cairo
def draw_png(filename):
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 512, 300)
c = cairo.Context(surface)
c.set_line_width(20)
c.move_to(50, 100)
c.rel_line_to(50, -50)
c.rel_line_to(50, 50)
c.set_line_join(cairo.LINE_JOIN_MITER) # default
c.stroke()
c.move_to(50, 150)
c.rel_line_to(50, -50)
c.rel_line_to(50, 50)
c.set_line_join(cairo.LINE_JOIN_BEVEL)
c.stroke()
c.move_to(50, 200)
c.rel_line_to(50, -50)
c.rel_line_to(50, 50)
c.set_line_join(cairo.LINE_JOIN_ROUND)
c.stroke()
c.move_to(200, 50)
c.rel_line_to(0, 150)
c.set_line_cap(cairo.LINE_CAP_BUTT)
c.stroke()
c.move_to(240, 50)
c.rel_line_to(0, 150)
c.set_line_cap(cairo.LINE_CAP_ROUND)
c.stroke()
c.move_to(280, 50)
c.rel_line_to(0, 150)
c.set_line_cap(cairo.LINE_CAP_SQUARE)
c.stroke()
c.rectangle(350, 50, 100, 100)
c.set_line_join(cairo.LINE_JOIN_ROUND)
c.stroke()
surface.write_to_png(filename)
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/2_transforms/invert_y_coordinates.py
import cairo
def draw_line(c):
c.move_to(10, 10)
c.line_to(100, 100)
c.stroke()
def draw_png(filename):
s = cairo.ImageSurface(cairo.FORMAT_ARGB32, 512, 256)
c = cairo.Context(s)
c.set_source_rgb(1,0,0)
draw_line(c)
# invert y coordinates
m = cairo.Matrix(yy=-1, y0=s.get_height())
c.transform(m)
c.set_source_rgb(0,0,1)
draw_line(c)
s.write_to_png(filename)
if __name__ == "__main__":
draw()
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/2_transforms/matrix.py
import cairo
import math
def draw_rect(c):
c.set_source_rgb(1,0,0)
c.rectangle(20, 20, 150, 100)
c.fill()
def draw_png_asd(filename):
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 512, 256)
c = cairo.Context(surface)
draw_rect(c)
# x_new = xx * x + xy * y + x0
# y_new = yx * x + yy * y + y0
# cairo.Matrix(xx, yx,
# xy, yy,
# x0, y0)
m = cairo.Matrix(1.0, 0.5,
0, 1.0,
256, 0.0)
c.transform(m)
draw_rect(c)
surface.write_to_png(filename)
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/2_transforms/rotate.py
import cairo
import math
def draw_png_rotate(filename):
surface = cairo.ImageSurface (cairo.FORMAT_ARGB32, 512, 300)
c = cairo.Context(surface)
c.set_source_rgb(1,1,1)
c.paint()
c.set_source_rgb(0,0,0)
c.save()
c.translate(50, 50)
c.rectangle(0, 0, 250, 150)
c.stroke()
c.restore()
c.save()
c.translate(250, 150)
c.rotate(math.pi / 4.0)
c.rectangle(0, 0, 250, 150)
c.stroke()
c.restore()
surface.write_to_png(filename)
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/2_transforms/translate_and_scale.py
import cairo
import math
def draw_picture(c, x, y, scale):
c.save()
c.translate(x, y)
c.scale(scale, scale)
c.set_source_rgb(1, 0, 0)
c.arc(120, 120, 120, 0, 2*math.pi)
c.fill()
c.set_source_rgb(1, 1, 1)
c.arc(160, 90, 40, 0, 2*math.pi)
c.fill()
c.restore()
def draw_png_asd(filename):
surface = cairo.ImageSurface (cairo.FORMAT_ARGB32, 512, 300)
#surface.set_device_scale(2,2)
c = cairo.Context(surface)
#c.set_antialias(cairo.ANTIALIAS_NONE)
c.set_source_rgb(1, 1, 1)
c.paint()
draw_picture(c, x=30, y=30, scale=1)
draw_picture(c, x=350, y=50, scale=0.5)
draw_picture(c, x=290, y=170, scale=0.25)
surface.write_to_png(filename)
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/3_clip_and_mask/clip.py
c.arc(100, 100, 75, 0, 2*math.pi)
c.save()
c.clip()
c.set_source_surface(ims, 0, 0)
c.paint()
c.restore()
c.set_source_surface(ims, 256, 0)
c.paint()
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/3_clip_and_mask/mask.py
import cairo
import math
import os
def create_from_png(image_name):
# ensure we can read image when working from another dir
cwd = os.getcwd()
dir_path = os.path.dirname(os.path.realpath(__file__))
os.chdir(dir_path)
ims = cairo.ImageSurface.create_from_png(image_name)
os.chdir(cwd)
return ims
def draw_png(filename):
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 512, 256)
c = cairo.Context(surface)
# draw mask alone
mask_img = create_from_png('mask.png')
c.set_source_surface(mask_img, 0, 0)
c.paint()
church_img = create_from_png('church.png')
c.set_source_surface(church_img, 256, 0)
c.paint()
# clip masking area
c.rectangle(256, 0, church_img.get_width(), church_img.get_height())
c.clip()
# apply mask
c.set_operator(cairo.OPERATOR_DEST_IN)
c.set_source_surface(mask_img, 256, 0)
c.paint()
surface.write_to_png(filename)
if __name__ == "__main__":
draw_png("masked_church.png")
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/4_patterns/patterns.py
#!/usr/bin/env python
import cairo
import math
import os
def create_from_png(image_name):
# ensure we can read image when working from another dir
cwd = os.getcwd()
dir_path = os.path.dirname(os.path.realpath(__file__))
os.chdir(dir_path)
ims = cairo.ImageSurface.create_from_png(image_name)
os.chdir(cwd)
return ims
def draw_png(filename):
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 512, 256)
c = cairo.Context(surface)
pat_surface = create_from_png("brick.png")
pat = cairo.SurfacePattern(pat_surface)
pat.set_extend(cairo.EXTEND_REPEAT)
c.set_source(pat)
c.arc(100, 100, 50, 0, 2*math.pi)
c.fill()
c.set_source_surface(pat_surface, 256, 50)
c.paint()
surface.write_to_png(filename)
if __name__ == "__main__":
draw_gif_sqlogo("patterns.gif")
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/5_gradients/linear_gradient.py
#!/usr/bin/env python
import cairo
import math
def draw_png(filename):
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 512, 256)
c = cairo.Context(surface)
x0, y0 = 20, 20
x1, y1 = 20, 220
lg = cairo.LinearGradient(x0, y0, x1, y1)
lg.add_color_stop_rgba(0.0, 1, 0, 0, 1)
lg.add_color_stop_rgba(0.5, 0, 1, 0, 1)
lg.add_color_stop_rgba(1.0, 0, 0, 1, 1)
c.rectangle(20, 20, 200, 200)
c.set_source(lg)
c.fill()
surface.write_to_png(filename)
if __name__ == "__main__":
draw_png("x.gif")
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/5_gradients/radial_gradients.py
#!/usr/bin/env python
import cairo
import math
def draw_png(filename):
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 512, 256)
c = cairo.Context(surface)
# cx0 - x coordinate for the center of the start circle
# cy0 - y coordinate for the center of the start circle
# radius0 - radius of the start circle
# cx1 - x coordinate for the center of the end circle
# cy1 - y coordinate for the center of the end circle
# radius1 - radius of the end circle
pat = cairo.RadialGradient(135, 130, 15,
140, 140, 40)
pat.add_color_stop_rgba(0, 1, 1, 1, 1)
pat.add_color_stop_rgba(0.3, 0.5, 0.5, 1, 1)
pat.add_color_stop_rgba(1, 0, 0, 1, 1)
c.set_source(pat)
c.arc(150, 150, 50, 0, 2*math.pi)
c.fill()
surface.write_to_png(filename)
if __name__ == "__main__":
draw_png("radial_gradient.png")
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/6_text_and_fonts/text.py
#!/usr/bin/env python
import cairo
def draw_png(filename):
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 512, 256)
c = cairo.Context(surface)
# choose font
c.select_font_face("Courier New")
c.set_font_size(14)
# basic example
c.move_to(50, 50)
c.show_text("Hello World")
# right align
for y, adj in [(100, "naughty"), (120, "cool"), (140, "bad")]:
s = "%s cats" % adj
_, _, txt_width, _, _, _ = c.text_extents(s)
c.move_to(150 - txt_width, y)
c.show_text(s)
# pick another font
c.select_font_face("Times",
cairo.FONT_SLANT_ITALIC,
cairo.FONT_WEIGHT_BOLD)
c.set_font_size(56)
c.move_to(200, 100)
c.show_text("Hi there")
surface.write_to_png(filename)
if __name__ == "__main__":
draw_gif_sqlogo("x.gif")
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/7_antialiasing/antialiasing.py
#!/usr/bin/env python
import cairo
import math
def draw_png(filename):
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 512, 256)
c = cairo.Context(surface)
c.select_font_face("Courier New")
c.set_font_size(28)
fo = cairo.FontOptions()
fo.set_antialias(cairo.ANTIALIAS_DEFAULT)
c.set_font_options(fo)
c.move_to(50, 50)
c.show_text("Antialias Default")
fo = cairo.FontOptions()
fo.set_antialias(cairo.ANTIALIAS_NONE)
c.set_font_options(fo)
c.move_to(50, 100)
c.show_text("Antialias None")
#
c.set_antialias(cairo.ANTIALIAS_DEFAULT)
c.arc(170, 170, 50, 0, 2*math.pi)
c.set_source_rgba(1,0,0,1)
c.fill()
c.set_antialias(cairo.ANTIALIAS_NONE)
c.arc(370, 170, 50, 0, 2*math.pi)
c.set_source_rgba(1,0,0,1)
c.fill()
surface.write_to_png(filename)
if __name__ == "__main__":
draw_png("x.gif")
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/8_animated_gifs/gif.py
import os
import imageio
def images_paths():
# ensure we can read images when working from another dir
cwd = os.getcwd()
dir_path = os.path.dirname(os.path.realpath(__file__))
os.chdir(dir_path)
files = [os.path.sep.join([dir_path, s])
for s in os.listdir(dir_path)
if s.endswith('.png')]
files.sort()
os.chdir(cwd)
return files
def draw_gif(filename):
images = []
for s in images_paths():
images.append(imageio.imread(s))
imageio.mimsave(filename, images, format='GIF', duration=0.5)
if __name__ == "__main__":
draw_gif("movie.gif")
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/8_animated_gifs/sq_logo_animated.py
#!/usr/bin/env python
import cairo
import math
import imageio
import numpy
from PIL import Image
COLOR_ORANGE_SQ = (250/255., 92/255., 53/255.)
COLOR_WHITE = (1, 1, 1)
def as_numpy_array(surface):
w = surface.get_width()
h = surface.get_height()
data = surface.get_data()
a = numpy.ndarray(shape=(h,w), dtype=numpy.uint32, buffer=data)
i = Image.frombytes("RGBA", (w,h), a, "raw", "BGRA", 0, 1)
return numpy.asarray(i)
def add_image(writer, surface):
a = as_numpy_array(surface)
writer.append_data(a)
def draw_gif_sqlogo(filename):
gif_writer = imageio.get_writer(filename, mode='I', duration=0.5)
w, h = 280, 280
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, w, h)
c = cairo.Context(surface)
# white background
c.set_source_rgb(1, 1, 1)
c.paint()
c.fill()
#add_image(gif_writer, surface)
c.translate(20, 20)
# main circle
c.set_source_rgb (*COLOR_ORANGE_SQ)
c.arc(120, 120, 120, 0, 2*math.pi)
c.fill()
add_image(gif_writer, surface)
# white rects
c.set_source_rgb (*COLOR_WHITE)
c.rectangle(60, 70, 120, 20)
c.fill()
add_image(gif_writer, surface)
c.rectangle(60, 110, 120, 60)
c.fill()
add_image(gif_writer, surface)
# orange part of the bridge
c.set_source_rgb (*COLOR_ORANGE_SQ)
c.rectangle(80, 145, 30, 25)
c.fill()
add_image(gif_writer, surface)
c.rectangle(130, 145, 30, 25)
c.fill()
add_image(gif_writer, surface)
c.arc(95, 145, 15, 0, 2*math.pi)
c.fill()
add_image(gif_writer, surface)
c.arc(145, 145, 15, 0, 2*math.pi)
c.fill()
add_image(gif_writer, surface)
if __name__ == "__main__":
draw_gif_sqlogo("sq.gif")
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eps.eps
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/9_formats/eps.py
import cairo
from cairo import PSSurface
import math
def draw_eps(filename):
surface = PSSurface(filename, 320, 240)
surface.set_eps(True)
c = cairo.Context(surface)
c.set_source_rgb(1, 1, 1)
c.paint()
c.arc(100, 80, 50, 0, 2*math.pi)
c.set_source_rgba(1,0,0,1)
c.fill()
surface.show_page()
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multipage_pdf.pdf
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/9_formats/multipage_pdf.py
import cairo
from cairo import PDFSurface
import math
def draw_pdf(filename):
surface = PDFSurface(filename, 320, 240)
c = cairo.Context(surface)
c.set_source_rgb(1, 1, 1)
c.paint()
c.arc(150, 150, 50, 0, 2*math.pi)
c.set_source_rgba(1,0,0,1)
c.fill()
surface.show_page()
c.set_source_rgb(1, 1, 1)
c.paint()
c.arc(100, 100, 50, 0, 2*math.pi)
c.set_source_rgba(1,0,1,1)
c.fill()
surface.show_page()
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pdf.pdf
|
/9_formats/pdf.py
import cairo
from cairo import PDFSurface
import math
def draw_pdf(filename):
surface = PDFSurface(filename, 320, 240)
c = cairo.Context(surface)
c.set_source_rgb(1, 1, 1)
c.paint()
c.arc(100, 80, 50, 0, 2*math.pi)
c.set_source_rgba(1,0,0,1)
c.fill()
surface.show_page()
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/9_formats/png.py
import cairo
import math
def draw_png(filename):
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 320, 240)
c = cairo.Context(surface)
c.set_source_rgb(1, 1, 1)
c.paint()
c.arc(100, 80, 50, 0, 2*math.pi)
c.set_source_rgba(1,0,0,1)
c.fill()
surface.write_to_png(filename)
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ps.ps
|
/9_formats/ps.py
import cairo
from cairo import PSSurface
import math
def draw_ps(filename):
surface = PSSurface(filename, 320, 240)
c = cairo.Context(surface)
c.set_source_rgb(1, 1, 1)
c.paint()
c.arc(100, 80, 50, 0, 2*math.pi)
c.set_source_rgba(1,0,0,1)
c.fill()
surface.show_page()
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/9_formats/svg.py
import cairo
from cairo import SVGSurface
import math
def draw_svg_asd(filename):
surface = SVGSurface(filename, 320, 240)
c = cairo.Context(surface)
c.set_source_rgb(1, 1, 1)
c.paint()
c.arc(100, 80, 50, 0, 2*math.pi)
c.set_source_rgba(1,0,0,1)
c.fill()
surface.finish()
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