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Scroll Performance

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Tuning news scrolling performance
This commit is contained in:
Chuck
2025-04-10 20:19:10 -05:00
parent 50349136f9
commit e24c46b9f4
3 changed files with 111 additions and 16 deletions
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64
src/news_manager.py
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@@ -9,6 +9,7 @@ import os
import urllib.parse
import re
from src.config_manager import ConfigManager
from PIL import Image, ImageDraw
# Configure logging
logging.basicConfig(level=logging.INFO)
@@ -108,6 +109,23 @@ class NewsManager:
else:
logger.error("Failed to fetch news for any configured stocks")
def _create_text_image(self, text: str, color: Tuple[int, int, int] = (255, 255, 255)) -> Image.Image:
"""Create an image containing the text for efficient scrolling."""
# Get text dimensions
bbox = self.display_manager.draw.textbbox((0, 0), text, font=self.display_manager.small_font)
text_width = bbox[2] - bbox[0]
text_height = bbox[3] - bbox[1]
# Create a new image with the text
text_image = Image.new('RGB', (text_width, self.display_manager.matrix.height), (0, 0, 0))
text_draw = ImageDraw.Draw(text_image)
# Draw the text centered vertically
y = (self.display_manager.matrix.height - text_height) // 2
text_draw.text((0, y), text, font=self.display_manager.small_font, fill=color)
return text_image
def display_news(self):
"""Display news headlines by scrolling them across the screen."""
if not self.news_config.get('enabled', False):
@@ -140,23 +158,41 @@ class NewsManager:
# Format the news text
news_text = f"{current_news['symbol']}: {current_news['title']}"
# Get text dimensions
bbox = self.display_manager.draw.textbbox((0, 0), news_text, font=self.display_manager.small_font)
text_width = bbox[2] - bbox[0]
# Create a text image for efficient scrolling
text_image = self._create_text_image(news_text)
text_width = text_image.width
# Clear the display
self.display_manager.clear()
# Calculate the visible portion of the text
visible_width = min(self.display_manager.matrix.width, text_width)
# Draw the news text at the current scroll position
self.display_manager.draw_text(
news_text,
x=self.display_manager.matrix.width - self.scroll_position,
y=16, # Center vertically
color=(255, 255, 255), # White
small_font=True
)
# If this is the first time displaying this news item, clear the screen
if self.scroll_position == 0:
self.display_manager.clear()
self.display_manager.update_display()
# Update the display
# Create a new image for the current frame
frame_image = Image.new('RGB', (self.display_manager.matrix.width, self.display_manager.matrix.height), (0, 0, 0))
# Calculate the source and destination regions for the visible portion
src_x = max(0, text_width - self.scroll_position - visible_width)
src_width = min(visible_width, text_width - src_x)
# Copy the visible portion of the text to the frame
if src_width > 0:
src_region = text_image.crop((src_x, 0, src_x + src_width, self.display_manager.matrix.height))
frame_image.paste(src_region, (0, 0))
# If we need to wrap around to the beginning of the text
if src_x == 0 and self.scroll_position > text_width:
remaining_width = self.display_manager.matrix.width - src_width
if remaining_width > 0:
wrap_src_width = min(remaining_width, text_width)
wrap_region = text_image.crop((0, 0, wrap_src_width, self.display_manager.matrix.height))
frame_image.paste(wrap_region, (src_width, 0))
# Update the display with the new frame
self.display_manager.image = frame_image
self.display_manager.draw = ImageDraw.Draw(frame_image)
self.display_manager.update_display()
# Update scroll position