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cairo-demo.py

#!/usr/bin/env python
"""Based on cairo-demo/X11/cairo-demo.c
"""
import cairo
import gtk
if gtk.pygtk_version < (2,7,0):
    import cairo.gtk

SIZE = 30

def triangle(ctx):
    ctx.move_to(SIZE, 0)
    ctx.rel_line_to(SIZE, 2*SIZE)
    ctx.rel_line_to(-2*SIZE, 0)
    ctx.close_path()

def square(ctx):
    ctx.move_to(0, 0)
    ctx.rel_line_to(2*SIZE, 0)
    ctx.rel_line_to(0, 2*SIZE)
    ctx.rel_line_to(-2*SIZE, 0)
    ctx.close_path()

def bowtie(ctx):
    ctx.move_to(0, 0)
    ctx.rel_line_to(2*SIZE, 2*SIZE)
    ctx.rel_line_to(-2*SIZE, 0)
    ctx.rel_line_to(2*SIZE, -2*SIZE)
    ctx.close_path()

def inf(ctx):
    ctx.move_to(0, SIZE)
    ctx.rel_curve_to(0,SIZE, SIZE,SIZE, 2*SIZE,0)
    ctx.rel_curve_to(SIZE,-SIZE, 2*SIZE,-SIZE, 2*SIZE,0)
    ctx.rel_curve_to(0,SIZE, -SIZE,SIZE, -2*SIZE,0)
    ctx.rel_curve_to(-SIZE,-SIZE, -2*SIZE,-SIZE, -2*SIZE,0)
    ctx.close_path()

def draw_shapes(ctx, x, y, fill):
    ctx.save()

    ctx.new_path()
    ctx.translate(x+SIZE, y+SIZE)
    bowtie(ctx)
    if fill:
        ctx.fill()
    else:
        ctx.stroke()

    ctx.new_path()
    ctx.translate(3*SIZE, 0)
    square(ctx)
    if fill:
        ctx.fill()
    else:
        ctx.stroke()

    ctx.new_path()
    ctx.translate(3*SIZE, 0)
    triangle(ctx)
    if fill:
        ctx.fill()
    else:
        ctx.stroke()

    ctx.new_path()
    ctx.translate(3*SIZE, 0)
    inf(ctx)
    if fill:
        ctx.fill()
    else:
        ctx.stroke()

    ctx.restore()

def fill_shapes(ctx, x, y):
    draw_shapes(ctx, x, y, True)

def stroke_shapes(ctx, x, y):
    draw_shapes(ctx, x, y, False)

def expose (da, event):
    x, y, width, height = da.allocation

    if gtk.pygtk_version >= (2,7,0):
        ctx = da.window.cairo_create()
    else:
        ctx = cairo.gtk.gdk_cairo_create(da.window)

    ctx.set_source_rgb(0, 0, 0)

    ctx.set_line_width(SIZE / 4)
    ctx.set_tolerance(0.1)

    ctx.set_line_join(cairo.LINE_JOIN_ROUND)
    ctx.set_dash([SIZE/4.0, SIZE/4.0], 0)
    stroke_shapes(ctx, 0, 0)

    ctx.set_dash([], 0)
    stroke_shapes(ctx, 0, 3*SIZE)

    ctx.set_line_join(cairo.LINE_JOIN_BEVEL)
    stroke_shapes(ctx, 0, 6*SIZE)

    ctx.set_line_join(cairo.LINE_JOIN_MITER)
    stroke_shapes(ctx, 0, 9*SIZE)

    fill_shapes(ctx, 0, 12*SIZE)

    ctx.set_line_join(cairo.LINE_JOIN_BEVEL)
    fill_shapes(ctx, 0, 15*SIZE)
    ctx.set_source_rgb(1,0,0)
    stroke_shapes(ctx, 0, 15*SIZE)

def main():
    win = gtk.Window()
    win.connect('destroy', gtk.main_quit)
    win.set_default_size(450, 550)

    drawingarea = gtk.DrawingArea()
    win.add(drawingarea)
    drawingarea.connect('expose_event', expose)

    win.show_all()
    gtk.main()

if __name__ == '__main__':
    main()

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