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scalerenderer.py
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scalerenderer.py
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import cairo
import json
import maplayout
from units import *
from cairoutils import *
from gi.repository import Pango
from gi.repository import PangoCairo
large_ticks_for_50000 = [ (0, 0),
(1, 1000),
(2, 2000),
(3, 3000),
(4, 4000) ]
small_ticks_for_50000 = [ (0, 0),
(500, 500),
(1000, 1000) ]
large_ticks_for_20000 = [ (0, 0),
(500, 500),
(1000, 1000),
(1500, 1500) ]
small_ticks_for_20000 = [ (0, 0),
(100, 100),
(200, 200),
(300, 300),
(400, 400),
(500, 500) ]
class ScaleRenderer:
def __init__ (self, map_layout):
self.map_layout = map_layout
self.outline_thickness_pt = 0.5
self.color_rgb = (0, 0, 0)
self.rule_width_mm = 2.0
self.tick_length_mm = 0.5
self.font_description_str = "Luxi Sans 4"
self.font_description = Pango.font_description_from_string (self.font_description_str)
def render_alternate_divisions (self, cr, num_divisions, left, top, division_length, division_height):
half_height = division_height / 2.0
for i in range (num_divisions):
if i % 2 == 0:
y = top
else:
y = top + half_height
x = left + i * division_length
cr.rectangle (x, y, division_length, half_height)
cr.fill ()
def render_ticks (self, cr,
xpos, ypos, height,
text_anchor,
sign,
ticks_pairs):
i = 0
y1 = ypos
y2 = ypos + height
while i < len (ticks_pairs):
(meters, label) = (ticks_pairs[i], ticks_pairs[i + 1])
x = xpos + sign * meters * 1000 / self.map_layout.map_scale_denom
cr.move_to (x, y1)
cr.line_to (x, y2)
cr.stroke ()
render_text (cr, x, y2, text_anchor, self.font_description, "{0}".format (label))
i += 2
# The anchor point is the horizontal center of the scale rule,
# and the vertical top of the scale rule.
#
def render (self, cr, center_x, top_y):
cr.save ()
layout = self.map_layout
millimeters_total = (layout.scale_large_divisions_interval_m * layout.scale_num_large_divisions
+ layout.scale_small_divisions_interval_m * layout.scale_num_small_divisions) * 1000
rule_length_mm = millimeters_total / layout.map_scale_denom
# upper-left coords will be (leftmost_x, top_y)
# size of rule will be (rule_length_mm, self.rule_width_mm)
leftmost_x = center_x - rule_length_mm / 2.0
large_scale_x = leftmost_x + layout.scale_num_small_divisions * layout.scale_small_divisions_interval_m * 1000 / layout.map_scale_denom
# Paint the main outline
set_source_rgb (cr, self.color_rgb)
cr.rectangle (leftmost_x, top_y,
rule_length_mm, self.rule_width_mm)
thickness_mm = pt_to_mm (self.outline_thickness_pt)
cr.set_line_width (thickness_mm)
cr.set_line_join (cairo.LINE_JOIN_MITER)
cr.stroke ()
# Paint the large-scale divisions on the right
self.render_alternate_divisions (cr,
layout.scale_num_large_divisions,
large_scale_x, top_y,
layout.scale_large_divisions_interval_m * 1000 / layout.map_scale_denom,
self.rule_width_mm)
self.render_ticks (cr,
large_scale_x, top_y + self.rule_width_mm, self.tick_length_mm,
"nw",
1,
layout.scale_large_ticks_m)
# Paint the small-scale divisions on the left
self.render_alternate_divisions (cr,
layout.scale_num_small_divisions,
leftmost_x, top_y,
layout.scale_small_divisions_interval_m * 1000 / layout.map_scale_denom,
self.rule_width_mm)
self.render_ticks (cr,
large_scale_x, top_y, -self.tick_length_mm,
"sw",
-1,
layout.scale_small_ticks_m)
cr.restore ()
if __name__ == "__main__":
surface = cairo.SVGSurface ("scale.svg", mm_to_pt (inch_to_mm (11.0)), mm_to_pt (inch_to_mm (8.5)))
cr = cairo.Context (surface)
factor = mm_to_pt (1.0)
cr.scale (factor, factor)
layout = maplayout.MapLayout ()
layout.load_from_json (json.loads ("""
{ "scale-large-divisions-interval-m" : 1000,
"scale-num-large-divisions" : 4,
"scale-small-divisions-interval-m" : 100,
"scale-num-small-divisions" : 10,
"scale-large-ticks-m" : [ 0, 0,
1000, 1,
2000, 2,
3000, 3,
4000, 4 ],
"scale-small-ticks-m" : [ 0, 0,
500, 500,
1000, 1000 ]
}
"""))
scale_renderer = ScaleRenderer (layout)
scale_renderer.render (cr, inch_to_mm (5.5), inch_to_mm (4))
font_desc = Pango.font_description_from_string ("Luxi Sans 4")
render_text (cr, inch_to_mm (5.5), inch_to_mm (4), "s", font_desc, "Hola mundo")