def draw(self, ctx, width, height):
self.tc += 0.2
self.tc %= 2 * math.pi
for i in range(-4, 5):
ctx.set_source_rgb(0.2, 0.5, 1)
ctx.set_line_width(6)
ctx.set_line_cap(cairo.LINE_CAP_ROUND)
if i % 2 == 0:
ctx.move_to(width / 2 + i * 10, height / 2 + 3 - 8 * math.sin(self.tc + i))
ctx.line_to(width / 2 + i * 10, height / 2 - 3 + 8 * math.sin(self.tc + i))
else:
ctx.set_source_rgb(0.2, 0.7, 1)
ctx.move_to(width / 2 + i * 10, height / 2 + 3 - 8 * math.cos(self.tc - i))
ctx.line_to(width / 2 + i * 10, height / 2 - 3 + 8 * math.cos(self.tc - i))
ctx.stroke()
python类LINE_CAP_ROUND的实例源码
def cairo_line_cap(line_cap):
if line_cap == 'round':
return cairo.LINE_CAP_ROUND
elif line_cap == 'square':
return cairo.LINE_CAP_SQUARE
else:
return cairo.LINE_CAP_BUTT
def create_normal_surfaces(self,
context, vis_width, vis_height, star_width):
rgba1 = context.get_border_color(Gtk.StateFlags.NORMAL)
rgba0 = context.get_color(Gtk.StateFlags.ACTIVE)
lin = cairo.LinearGradient(0, 0, 0, vis_height)
lin.add_color_stop_rgb(0, rgba0.red, rgba0.green, rgba0.blue)
lin.add_color_stop_rgb(1, rgba1.red, rgba1.green, rgba1.blue)
# paint full
full_surf = cairo.ImageSurface(
cairo.FORMAT_ARGB32, vis_width, vis_height)
cr = cairo.Context(full_surf)
cr.set_source(lin)
cr.set_line_width(1)
if self.rounded:
cr.set_line_join(cairo.LINE_CAP_ROUND)
for i in range(self.n_stars):
x = 1 + i * (star_width + self.spacing)
self.layout(cr, x + 1, 1, star_width - 2, vis_height - 2)
cr.stroke_preserve()
cr.fill()
del cr
# paint empty
empty_surf = cairo.ImageSurface(
cairo.FORMAT_ARGB32, vis_width, vis_height)
cr = cairo.Context(empty_surf)
cr.set_source(lin)
cr.set_line_width(1)
if self.rounded:
cr.set_line_join(cairo.LINE_CAP_ROUND)
for i in range(self.n_stars):
x = 1 + i * (star_width + self.spacing)
self.layout(cr, x + 1, 1, star_width - 2, vis_height - 2)
cr.stroke()
del cr
return full_surf, empty_surf
def create_normal_surfaces(self,
context, vis_width, vis_height, star_width):
rgba1 = context.get_border_color(Gtk.StateFlags.NORMAL)
rgba0 = context.get_color(Gtk.StateFlags.ACTIVE)
lin = cairo.LinearGradient(0, 0, 0, vis_height)
lin.add_color_stop_rgb(0, rgba0.red, rgba0.green, rgba0.blue)
lin.add_color_stop_rgb(1, rgba1.red, rgba1.green, rgba1.blue)
# paint full
full_surf = cairo.ImageSurface(
cairo.FORMAT_ARGB32, vis_width, vis_height)
cr = cairo.Context(full_surf)
cr.set_source(lin)
cr.set_line_width(1)
if self.rounded:
cr.set_line_join(cairo.LINE_CAP_ROUND)
for i in range(self.n_stars):
x = 1 + i * (star_width + self.spacing)
self.layout(cr, x + 1, 1, star_width - 2, vis_height - 2)
cr.stroke_preserve()
cr.fill()
del cr
# paint empty
empty_surf = cairo.ImageSurface(
cairo.FORMAT_ARGB32, vis_width, vis_height)
cr = cairo.Context(empty_surf)
cr.set_source(lin)
cr.set_line_width(1)
if self.rounded:
cr.set_line_join(cairo.LINE_CAP_ROUND)
for i in range(self.n_stars):
x = 1 + i * (star_width + self.spacing)
self.layout(cr, x + 1, 1, star_width - 2, vis_height - 2)
cr.stroke()
del cr
return full_surf, empty_surf
def text_block(ctx, obj, text, font, lang="en-US", debug=False):
ctx.save()
lyt = PangoCairo.create_layout(ctx)
pg_ctx = lyt.get_context()
pg_ctx.set_language(Pango.Language.from_string(lang))
fo = cairo.FontOptions()
fo.set_antialias(cairo.ANTIALIAS_SUBPIXEL)
PangoCairo.context_set_font_options(pg_ctx, fo)
font_family = font.family if not font.replace else font.replace
pg_font = Pango.FontDescription("{} {}px".format(font_family, font.size))
lyt.set_font_description(pg_font)
lyt.set_markup(text, -1) # force length calculation
lyt.set_height(obj.height * Pango.SCALE * 1.5) # TODO what?
lyt.set_width(obj.width * Pango.SCALE)
lyt.set_alignment(Pango.Alignment.CENTER)
#PangoCairo.update_layout(ctx, lyt)
pg_size = lyt.get_pixel_size()
ink, logical = lyt.get_pixel_extents()
while ink.height > obj.height and pg_font.get_size() > 0:
pg_font.set_size(pg_font.get_size() - Pango.SCALE)
lyt.set_font_description(pg_font)
ink, logical = lyt.get_pixel_extents()
#x = obj["x"] - pext.x - pext.width / 2
#y = obj["y"] - pext.y - pext.height / 2
x = (obj.x + obj.width / 2) - ((ink.x + ink.width / 2))
y = (obj.y + obj.height / 2) - ((ink.y + ink.height / 2))
#x = obj["x"]
#y = obj["y"]
if debug:
print("x,y: %s, %s" % (x, y))
ctx.translate(x, y)
PangoCairo.update_layout(ctx, lyt)
PangoCairo.layout_path(ctx, lyt)
ctx.set_line_width(9.0)
ctx.set_line_cap(cairo.LINE_CAP_ROUND)
ctx.set_line_join(cairo.LINE_JOIN_ROUND)
ctx.set_source_rgb(*font.color)
PangoCairo.show_layout(ctx, lyt)
ctx.new_path()
ctx.restore()
if debug:
rectangle(ctx, ink.x, ink.y, ink.width, ink.height, True, 2.0, (0, 1, 0))
rectangle(ctx, obj.x, obj.y, obj.width, obj.height, True, 2.0, (0.8, 0.8, 0))
def draw(self, context):
context.save()
# reduce the font size, until its <= the curve length
# TODO could use some estimate to speed this up
size_step = 1
size = self.size
while True:
path, extents, xheight = text_path(context, self.font, size, self.text)
if extents.width > self.curve.length:
size -= size_step
else:
break
# use the height to adjust the curve so that text centered on curve vertically
self.curve.offset(0, xheight / 2)
width = extents.width
# Centre text horizontally when shorter than curve length
length = self.curve.length
if width < length:
r = width / float(length)
half = r / 2
minr = 0.5 - half
maxr = 0.5 + half
rng = (minr, maxr)
else:
rng = (0, 1)
context.new_path()
for ptype, pts in path:
if ptype == cairo.PATH_MOVE_TO:
x, y = self._fit(width, pts[0], pts[1], rng)
context.move_to(x, y)
elif ptype == cairo.PATH_LINE_TO:
x, y = self._fit(width, pts[0], pts[1], rng)
context.line_to(x,y)
elif ptype == cairo.PATH_CURVE_TO:
x, y = self._fit(width, pts[0], pts[1], rng)
u, v = self._fit(width, pts[2], pts[3], rng)
s, t = self._fit(width, pts[4], pts[5], rng)
context.curve_to(x, y, u, v, s, t)
elif ptype == cairo.PATH_CLOSE_PATH:
context.close_path()
if self.outline:
context.set_source_rgb(*self.outline)
context.set_line_cap(cairo.LINE_CAP_ROUND)
context.set_line_join(cairo.LINE_JOIN_ROUND)
context.set_line_width(6)
context.stroke_preserve()
context.set_source_rgb(*self.color)
context.fill()
context.restore()
