87 lines
2.8 KiB
Python
87 lines
2.8 KiB
Python
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from typing import Dict, Optional
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import pyglet
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from pyglet.font import base
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class UserGlyphRenderer(base.GlyphRenderer):
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def __init__(self, font: 'UserDefinedFont'):
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self._font = font
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self._font.glyphs[self._font.default_char] = self.render(self._font.default_char)
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super().__init__(font)
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def render(self, text: str):
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image_data = self._font.mappings[text]
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glyph = self._font.create_glyph(image_data)
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glyph.set_bearings(-self._font.descent, 0, image_data.width)
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return glyph
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class UserDefinedFont(base.Font):
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"""A basic UserDefinedFont, it takes a mappings of ImageData """
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glyph_renderer_class = UserGlyphRenderer
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def __init__(self, mappings: Dict[str, pyglet.image.ImageData], default_char: str, name: str, ascent: float,
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descent: float, size: float, bold: bool = False, italic: bool = False, stretch: bool = False,
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dpi: int = None,
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locale: Optional[str] = None):
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super().__init__()
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self._name = name
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self.mappings: Dict[str, pyglet.image.ImageData] = mappings
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if default_char not in self.mappings:
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raise Exception(f"Default character: '{default_char}' must exist within your mappings.")
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if ascent is None or descent is None:
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image = list(mappings.values())[0]
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if ascent is None:
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ascent = image.height
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if descent is None:
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descent = 0
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self.ascent = ascent
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self.descent = descent
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self.default_char = default_char
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self.bold = bold
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self.italic = italic
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self.stretch = stretch
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self.dpi = dpi
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self.size = size
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self.locale = locale
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@property
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def name(self):
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return self._name
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def get_glyphs(self, text):
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"""Create and return a list of Glyphs for `text`.
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If any characters do not have a known glyph representation in this
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font, a substitution will be made.
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:Parameters:
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`text` : str or unicode
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Text to render.
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:rtype: list of `Glyph`
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"""
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glyph_renderer = None
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glyphs = [] # glyphs that are committed.
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for c in base.get_grapheme_clusters(str(text)):
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# Get the glyph for 'c'. Hide tabs (Windows and Linux render
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# boxes)
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if c == '\t':
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c = ' '
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if c not in self.glyphs:
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if not glyph_renderer:
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glyph_renderer = self.glyph_renderer_class(self)
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if c not in self.mappings:
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c = self.default_char
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else:
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self.glyphs[c] = glyph_renderer.render(c)
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glyphs.append(self.glyphs[c])
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return glyphs
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