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Optimize scrolling text performance for news ticker

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ChuckBuilds
2025-04-11 09:47:13 -05:00
parent 7925bf515b
commit e8aa05a0b4
2 changed files with 43 additions and 31 deletions
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55
src/stock_news_manager.py
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@@ -205,28 +205,40 @@ class StockNewsManager:
separator = " - " # Visual separator between news items
news_text = separator.join(news_texts)
# Pre-render the text image for efficient scrolling
text_image = self._create_text_image(news_text)
text_width = text_image.width
display_width = self.display_manager.matrix.width
# Calculate total width for scrolling
total_width = text_width + display_width
# Update scroll position with smooth acceleration
scroll_speed = min(self.scroll_speed * 1.1, 3) # Gradually increase speed up to max
self.scroll_position = (self.scroll_position + scroll_speed) % total_width
# Clear the display
self.display_manager.clear()
# Calculate text width for scrolling
bbox = self.display_manager.draw.textbbox((0, 0), news_text, font=self.display_manager.small_font)
text_width = bbox[2] - bbox[0]
# Calculate scroll position
display_width = self.display_manager.matrix.width
total_width = text_width + display_width
# Update scroll position
self.scroll_position = (self.scroll_position + self.scroll_speed) % total_width
# Draw the text at the current scroll position
self.display_manager.draw_text(
news_text,
x=display_width - self.scroll_position,
y=None, # Center vertically
color=(255, 255, 255),
small_font=True
)
# Calculate source and destination regions for efficient blitting
if self.scroll_position < display_width:
# Text is entering from the right
src_x = text_width - (display_width - self.scroll_position)
src_width = display_width - self.scroll_position
dst_x = self.scroll_position
self.display_manager.image.paste(
text_image.crop((src_x, 0, src_x + src_width, text_image.height)),
(dst_x, 0)
)
else:
# Text is scrolling off the left
src_x = 0
src_width = text_width
dst_x = self.scroll_position - display_width
self.display_manager.image.paste(
text_image.crop((src_x, 0, src_x + src_width, text_image.height)),
(dst_x, 0)
)
# Update the display
self.display_manager.update_display()
@@ -234,9 +246,10 @@ class StockNewsManager:
# If we've completed a full scroll, move to the next group
if self.scroll_position == 0:
self.current_news_group = (self.current_news_group + 1) % ((total_headlines + headlines_per_rotation - 1) // headlines_per_rotation)
self.scroll_speed = 1 # Reset speed for next group
# Small delay to control scroll speed
time.sleep(self.scroll_delay)
# Minimal delay to control scroll speed while maintaining smoothness
time.sleep(0.001)
# Log frame rate
self._log_frame_rate()