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Add anchor_label method #223

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Add anchor_label method #223

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42 changes: 42 additions & 0 deletions adafruit_display_text/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@
__repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_Display_Text.git"

from displayio import Group, Palette
from micropython import const

try:
from typing import List, Optional, Tuple
Expand Down Expand Up @@ -219,6 +220,17 @@ class LabelBase(Group):
:param bool verbose: print debugging information in some internal functions. Default to False
"""

# Anchor point constants for anchor_label method.
ANCHOR_TOP_LEFT = const((0.0, 0.0))
ANCHOR_TOP_CENTER = const((0.5, 0.0))
ANCHOR_TOP_RIGHT = const((1.0, 0.0))
ANCHOR_CENTER_LEFT = const((0.0, 0.5))
ANCHOR_CENTER = const((0.5, 0.5))
ANCHOR_CENTER_RIGHT = const((1.0, 0.5))
ANCHOR_BOTTOM_LEFT = const((0.0, 1.0))
ANCHOR_BOTTOM_CENTER = const((0.5, 1.0))
ANCHOR_BOTTOM_RIGHT = const((1.0, 1.0))

def __init__(
self,
font: FontProtocol,
Expand Down Expand Up @@ -456,3 +468,33 @@ def label_direction(self, new_label_direction: str) -> None:

def _replace_tabs(self, text: str) -> str:
return text if text.find("\t") < 0 else self._tab_text.join(text.split("\t"))

def anchor_label(self, anchor: Tuple[float, float], width: int, height: int) -> None:
"""Position the label on screen using the given anchor and display size.

:param anchor: One of the predefined anchor constants (e.g., ANCHOR_TOP_LEFT, ANCHOR_CENTER)
:param width: Width of the display in pixels
:param height: Height of the display in pixels
"""
if anchor not in {
LabelBase.ANCHOR_TOP_LEFT,
LabelBase.ANCHOR_TOP_CENTER,
LabelBase.ANCHOR_TOP_RIGHT,
LabelBase.ANCHOR_CENTER_LEFT,
LabelBase.ANCHOR_CENTER,
LabelBase.ANCHOR_CENTER_RIGHT,
LabelBase.ANCHOR_BOTTOM_LEFT,
LabelBase.ANCHOR_BOTTOM_CENTER,
LabelBase.ANCHOR_BOTTOM_RIGHT,
}:
raise ValueError(
"Anchor must be one of: ANCHOR_TOP_LEFT, ANCHOR_TOP_CENTER, ANCHOR_TOP_RIGHT,\n"
"ANCHOR_CENTER_LEFT, ANCHOR_CENTER, ANCHOR_CENTER_RIGHT,\n"
"ANCHOR_BOTTOM_LEFT, ANCHOR_BOTTOM_CENTER, ANCHOR_BOTTOM_RIGHT."
)

self.anchor_point = anchor
self.anchored_position = (
int(anchor[0] * width),
int(anchor[1] * height),
)
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