import math
import cairo

WIDTH, HEIGHT = 256, 256

surface = cairo.ImageSurface (cairo.FORMAT_ARGB32, WIDTH, HEIGHT)
ctx = cairo.Context (surface)

#ctx.scale (WIDTH, HEIGHT) # Normalizing the canvas

pat = cairo.LinearGradient(0.0, 0.0, 0.0, 256.0)
pat.add_color_stop_rgba (1, 0.7, 0, 0, 0.5) # First stop, 50% opacity
pat.add_color_stop_rgba (0, 0.9, 0.7, 0.2, 1) # Last stop, 100% opacity

ctx.rectangle (0, 0, 256, 256) # Rectangle(x0, y0, x1, y1)
ctx.set_source (pat)
ctx.fill ()

ctx.move_to(0, 0)
ctx.arc (100, 100, 20, -math.pi/2, 0) # Arc(cx, cy, radius, start_angle, stop_angle)
ctx.line_to (100, 100) # Line to (x,y)
#ctx.curve_to (0.5, 0.2, 0.5, 0.4, 0.2, 0.8) # Curve(x1, y1, x2, y2, x3, y3)
#ctx.close_path()

ctx.set_source_rgb(0.3, 0.2, 0.5) # Solid color
ctx.set_line_width(1)
ctx.stroke ()

surface.write_to_png ("example.png") # Output to PNG
