kopia lustrzana https://github.com/hholzgra/ocitysmap
133 wiersze
5.6 KiB
Python
133 wiersze
5.6 KiB
Python
# -*- coding: utf-8 -*-
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# ocitysmap, city map and street index generator from OpenStreetMap data
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# Copyright (C) 2010 David Decotigny
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# Copyright (C) 2010 Frédéric Lehobey
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# Copyright (C) 2010 Pierre Mauduit
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# Copyright (C) 2010 David Mentré
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# Copyright (C) 2010 Maxime Petazzoni
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# Copyright (C) 2010 Thomas Petazzoni
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# Copyright (C) 2010 Gaël Utard
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import cairo
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import pango
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def draw_text(ctx, pc, layout, fascent, fheight,
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baseline_x, baseline_y, text, pango_alignment):
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"""Draws the given text into the provided Cairo
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context through the Pango layout (get_width() expected to be
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correct in order to position the text correctly) with the
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specified pango.ALIGN_x alignment.
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Args:
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ctx (cairo.Context): cairo context to use
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pc (pangocairo.CairoContext): pango context
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layout (pango.Layout): pango layout to draw into (get_with() important)
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fascent, fheight (int): current font ascent/height metrics
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baseline_x/baseline_y (int): coordinate of the left baseline cairo point
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pango_alignment (enum): pango.ALIGN_ constant value
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Results:
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A 3-uple text_width, text_height (cairo units)
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"""
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layout.set_auto_dir(False) # Make sure ALIGN_RIGHT is independent on RTL...
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layout.set_alignment(pango_alignment)
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layout.set_text(text)
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width, height = [x/pango.SCALE for x in layout.get_size()]
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ctx.move_to(baseline_x, baseline_y - fascent)
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pc.show_layout(layout)
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return width, height
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def draw_text_left(ctx, pc, layout, fascent, fheight,
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baseline_x, baseline_y, text):
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"""Draws the given text left aligned into the provided Cairo
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context through the Pango layout (get_width() expected to be
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correct in order to position the text correctly).
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Args:
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ctx (cairo.Context): cairo context to use
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pc (pangocairo.CairoContext): pango context
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layout (pango.Layout): pango layout to draw into (get_with() important)
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fascent, fheight (int): current font ascent/height metrics
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baseline_x/baseline_y (int): coordinate of the left baseline cairo point
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pango_alignment (enum): pango.ALIGN_ constant value
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Results:
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A 3-uple left_x, baseline_y, right_x of the text rendered (cairo units)
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"""
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w,h = draw_text(ctx, pc, layout, fascent, fheight,
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baseline_x, baseline_y, text, pango.ALIGN_LEFT)
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return baseline_x, baseline_y, baseline_x + w
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def draw_text_center(ctx, pc, layout, fascent, fheight,
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baseline_x, baseline_y, text):
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"""Draws the given text centered inside the provided Cairo
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context through the Pango layout (get_width() expected to be
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correct in order to position the text correctly).
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Args:
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ctx (cairo.Context): cairo context to use
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pc (pangocairo.CairoContext): pango context
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layout (pango.Layout): pango layout to draw into (get_with() important)
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fascent, fheight (int): current font ascent/height metrics
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baseline_x/baseline_y (int): coordinate of the left baseline cairo point
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pango_alignment (enum): pango.ALIGN_ constant value
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Results:
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A 3-uple left_x, baseline_y, right_x of the text rendered (cairo units)
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"""
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txt_width, txt_height = draw_text(ctx, pc, layout, fascent, fheight,
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baseline_x, baseline_y, text,
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pango.ALIGN_CENTER)
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layout_width = layout.get_width() / pango.SCALE
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return ( baseline_x + (layout_width - txt_width) / 2.,
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baseline_y,
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baseline_x + (layout_width + txt_width) / 2. )
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def draw_text_right(ctx, pc, layout, fascent, fheight,
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baseline_x, baseline_y, text):
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"""Draws the given text right aligned into the provided Cairo
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context through the Pango layout (get_width() expected to be
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correct in order to position the text correctly).
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Args:
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ctx (cairo.Context): cairo context to use
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pc (pangocairo.CairoContext): pango context
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layout (pango.Layout): pango layout to draw into (get_with() important)
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fascent, fheight (int): current font ascent/height metrics
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baseline_x/baseline_y (int): coordinate of the left baseline cairo point
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pango_alignment (enum): pango.ALIGN_ constant value
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Results:
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A 3-uple left_x, baseline_y, right_x of the text rendered (cairo units)
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"""
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txt_width, txt_height = draw_text(ctx, pc, layout, fascent, fheight,
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baseline_x, baseline_y,
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text, pango.ALIGN_RIGHT)
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layout_width = layout.get_width() / pango.SCALE
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return (baseline_x + layout_width - txt_width,
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baseline_y,
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baseline_x + layout_width)
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def draw_dotted_line(ctx, line_width, baseline_x, baseline_y, length):
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ctx.set_line_width(line_width)
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ctx.set_dash([line_width, line_width*2])
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ctx.move_to(baseline_x, baseline_y)
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ctx.rel_line_to(length, 0)
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ctx.stroke()
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