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2bc88b5 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | import matplotlib
matplotlib.use('Agg')
import matplotlib.pyplot as plt
import io
from PIL import Image, ImageDraw, ImageFont
def create_placeholder_image():
"""Cria uma imagem placeholder simples com texto"""
# Cores profissionais
bg_color = (248, 250, 252) # Slate-50
text_color = (100, 116, 139) # Slate-500
img = Image.new('RGB', (800, 600), color=bg_color)
draw = ImageDraw.Draw(img)
# Carregar fonte
try:
font = ImageFont.truetype("/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf", 48)
except:
font = ImageFont.load_default()
# Texto centralizado
text = "Waiting for plot..."
bbox = draw.textbbox((0, 0), text, font=font)
text_width = bbox[2] - bbox[0]
text_height = bbox[3] - bbox[1]
x = (800 - text_width) // 2
y = (600 - text_height) // 2
draw.text((x, y), text, fill=text_color, font=font)
return img
last_chart_image = None
PLACEHOLDER_IMAGE = create_placeholder_image()
def get_current_chart():
"""Retorna o gráfico atual ou placeholder"""
global last_chart_image
return last_chart_image if last_chart_image is not None else PLACEHOLDER_IMAGE
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