我们从Python开源项目中，提取了以下7个代码示例，用于说明如何使用cairo.FontOptions()。
def shadowed_text(cr, args, x, y, string): cr.save() cr.new_path() cr.move_to(x, y) if not args.antialias_font: fo = cairo.FontOptions() fo.set_antialias(cairo.ANTIALIAS_NONE) cr.set_font_options(fo) cr.set_font_size(args.size_font) cr.text_path(string) cr.set_source_rgb(*[float(f) for f in args.color_font_shadow.split(',')]) cr.stroke_preserve() cr.set_source_rgb(*[float(f) for f in args.color_font.split(',')]) cr.fill() cr.new_path() cr.restore()
def cairo_text_bbox(text, font_params, scale=1.0): surf = cairo.ImageSurface(cairo.FORMAT_ARGB32, 8, 8) ctx = cairo.Context(surf) # The scaling must match the final context. # If not there can be a mismatch between the computed extents here # and those generated for the final render. ctx.scale(scale, scale) font = cairo_font(font_params) if use_pygobject: layout = pangocairo.create_layout(ctx) pctx = layout.get_context() fo = cairo.FontOptions() fo.set_antialias(cairo.ANTIALIAS_SUBPIXEL) pangocairo.context_set_font_options(pctx, fo) layout.set_font_description(font) layout.set_text(text, len(text)) re = layout.get_pixel_extents()[1] extents = (re.x, re.y, re.x + re.width, re.y + re.height) else: # pyGtk pctx = pangocairo.CairoContext(ctx) pctx.set_antialias(cairo.ANTIALIAS_SUBPIXEL) layout = pctx.create_layout() layout.set_font_description(font) layout.set_text(text) #print('@@ EXTENTS:', layout.get_pixel_extents()[1]) extents = layout.get_pixel_extents()[1] w = extents[2] - extents[0] h = extents[3] - extents[1] x0 = - w // 2.0 y0 = - h // 2.0 return [x0,y0, x0+w,y0+h]
def cairo_draw_text(x, y, text, font, text_color, c): c.save() #print('## TEXT COLOR:', text_color) c.set_source_rgba(*rgb_to_cairo(text_color)) font = cairo_font(font) c.translate(x, y) if use_pygobject: layout = pangocairo.create_layout(c) pctx = layout.get_context() fo = cairo.FontOptions() fo.set_antialias(cairo.ANTIALIAS_SUBPIXEL) pangocairo.context_set_font_options(pctx, fo) layout.set_font_description(font) layout.set_text(text, len(text)) pangocairo.update_layout(c, layout) pangocairo.show_layout(c, layout) else: # pyGtk pctx = pangocairo.CairoContext(c) pctx.set_antialias(cairo.ANTIALIAS_SUBPIXEL) layout = pctx.create_layout() layout.set_font_description(font) layout.set_text(text) pctx.update_layout(layout) pctx.show_layout(layout) c.restore()
def draw_text(x, y, text, font, text_color, spacing, c): c.save() c.set_source_rgba(*rgb_to_cairo(text_color)) font = cairo_font(font) c.translate(x, y) if use_pygobject: status, attrs, plain_text, _ = pango.parse_markup(text, len(text), '\0') layout = pangocairo.create_layout(c) pctx = layout.get_context() fo = cairo.FontOptions() fo.set_antialias(cairo.ANTIALIAS_SUBPIXEL) pangocairo.context_set_font_options(pctx, fo) layout.set_font_description(font) layout.set_spacing(spacing * pango.SCALE) layout.set_text(plain_text, len(plain_text)) layout.set_attributes(attrs) pangocairo.update_layout(c, layout) pangocairo.show_layout(c, layout) else: # pyGtk attrs, plain_text, _ = pango.parse_markup(text) pctx = pangocairo.CairoContext(c) pctx.set_antialias(cairo.ANTIALIAS_SUBPIXEL) layout = pctx.create_layout() layout.set_font_description(font) layout.set_spacing(spacing * pango.SCALE) layout.set_text(plain_text) layout.set_attributes(attrs) pctx.update_layout(layout) pctx.show_layout(layout) c.restore()
def text_path(context, font, size, text, debug=False): """Create a Pango text layout and return it as a Cairo path""" context.save() pg_layout = PangoCairo.create_layout(context) pg_context = pg_layout.get_context() font_options = cairo.FontOptions() font_options.set_antialias(cairo.ANTIALIAS_SUBPIXEL) PangoCairo.context_set_font_options(pg_context, font_options) font_descp = "{0} {1:d}".format(font, size) pg_layout.set_font_description(Pango.FontDescription(font_descp)) pg_layout.set_text(text, -1) # force length calculation PangoCairo.update_layout(context, pg_layout) # TODO watch out for ink & logical, need check extents = pg_layout.get_pixel_extents()[0] # TODO debug necessary? if debug: context.set_source_rgb(0, 0, 0) PangoCairo.show_layout(context, pg_layout) print("text_path: ({0}, {1}, {2}, {3})".format( extents.x, extents.y, extents.width, extents.height)) context.rectangle(extents.x, extents.y, extents.width, extents.height) context.set_line_width(1.0) context.set_line_join(cairo.LINE_JOIN_MITER) context.set_source_rgb(0, 0.8, 0) context.stroke() #PangoCairo.layout_path(context, pg_layout) PangoCairo.layout_line_path(context, pg_layout.get_line(0)) path = context.copy_path() # clear the path context.new_path() context.restore() return (path, extents, xheight(pg_layout).height)
def cairo_text_bbox(text, font_params, spacing=0, scale=1.0): surf = cairo.ImageSurface(cairo.FORMAT_ARGB32, 8, 8) ctx = cairo.Context(surf) # The scaling must match the final context. # If not there can be a mismatch between the computed extents here # and those generated for the final render. ctx.scale(scale, scale) font = cairo_font(font_params) if use_pygobject: status, attrs, plain_text, _ = pango.parse_markup(text, len(text), '\0') layout = pangocairo.create_layout(ctx) pctx = layout.get_context() fo = cairo.FontOptions() fo.set_antialias(cairo.ANTIALIAS_SUBPIXEL) pangocairo.context_set_font_options(pctx, fo) layout.set_font_description(font) layout.set_spacing(spacing * pango.SCALE) layout.set_text(plain_text, len(plain_text)) layout.set_attributes(attrs) li = layout.get_iter() # Get first line of text baseline = li.get_baseline() / pango.SCALE re = layout.get_pixel_extents()[1] # Get logical extents extents = (re.x, re.y, re.x + re.width, re.y + re.height) else: # pyGtk attrs, plain_text, _ = pango.parse_markup(text) pctx = pangocairo.CairoContext(ctx) pctx.set_antialias(cairo.ANTIALIAS_SUBPIXEL) layout = pctx.create_layout() layout.set_font_description(font) layout.set_spacing(spacing * pango.SCALE) layout.set_text(plain_text) layout.set_attributes(attrs) li = layout.get_iter() # Get first line of text baseline = li.get_baseline() / pango.SCALE #print('@@ EXTENTS:', layout.get_pixel_extents()[1], spacing) extents = layout.get_pixel_extents()[1] # Get logical extents return [extents[0], extents[1], extents[2], extents[3], baseline]
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))
