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Add functions to draw text

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fruchti 2023-12-17 14:10:00 +01:00
parent 783d8b3868
commit 59f7311ede
2 changed files with 56 additions and 0 deletions
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55
lib/plot.py
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@ -2,6 +2,7 @@
import cairo
import numpy as np
from HersheyFonts import HersheyFonts
class Paper:
@ -135,6 +136,17 @@ A6_PORTRAIT = Paper(105, 148, 8)
A6_LANDSCAPE = Paper(148, 105, 8)
def _measure_text(hf, text):
points = np.array([point for stroke in hf.strokes_for_text(text)
for point in stroke])
return {
'x': points[:, 0].min(),
'y': points[:, 1].min(),
'width': points[:, 0].max() - points[:, 0].min(),
'height': points[:, 1].max() - points[:, 1].min(),
}
class Plotter:
def __init__(self, paper, line_width=0, colour=[0, 0, 0, 1]):
@ -174,6 +186,49 @@ class Plotter:
self.line_to(self.paper.top_left())
self.line_to(self.paper.bottom_left())
def draw_text(self, text, position, font='futural', height=10, x_scale=1,
fit_width=None, fixed_height=True, spacing=None,
v_align='baseline', h_align='left'):
x, y = position
hf = HersheyFonts()
hf.load_default_font(font)
hf.normalize_rendering(height)
hf.render_options['scaley'] *= -1
hf.render_options['scalex'] *= x_scale
if spacing is not None:
hf.render_options['spacing'] = spacing
hf.render_options['yofs'] -= hf.render_options['base_line']
metrics = _measure_text(hf, text)
if fit_width is not None:
hf.render_options['scalex'] *= fit_width / metrics['width']
hf.render_options['spacing'] *= fit_width / metrics['width']
metrics['x'] *= fit_width / metrics['width']
if not fixed_height:
hf.render_options['scaley'] *= fit_width / metrics['width']
metrics['y'] *= fit_width / text_width
metrics['height'] *= fit_width / metrics['width']
metrics['width'] = fit_width
if h_align == 'centre':
x -= metrics['width'] / 2
elif h_align == 'right':
x -= metrics['width']
x -= metrics['x']
if v_align == 'bottom':
y -= metrics['y'] + metrics['height']
elif v_align == 'top':
y -= metrics['y']
for s in hf.strokes_for_text(text):
self.move_to((s[0][0] + x, s[0][1] + y))
for p in s[1:]:
self.line_to((p[0] + x, p[1] + y))
class SVGPlotter(Plotter):