app.py

import streamlit as st
import svgwrite
st.set_page_config(page_title="SVG Optical Illusions", page_icon=":eyeglasses:")

# Define the card suits and values
suits = ["clubs", "diamonds", "hearts", "spades"]
values = ["A", "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K"]

# Define the size of the cards
CARD_WIDTH = 75
CARD_HEIGHT = 100

# Define the size of the SVG canvas
CANVAS_WIDTH = CARD_WIDTH * 13
CANVAS_HEIGHT = CARD_HEIGHT * 4

# Create a new SVG drawing
dwg = svgwrite.Drawing(size=(f"{CANVAS_WIDTH}px", f"{CANVAS_HEIGHT}px"))

# Draw each card in the SVG canvas
for suit_idx, suit in enumerate(suits):
    for value_idx, value in enumerate(values):
        # Calculate the position of the card on the canvas
        x = CARD_WIDTH * value_idx
        y = CARD_HEIGHT * suit_idx

        # Draw the card border
        dwg.add(dwg.rect((x, y), (CARD_WIDTH, CARD_HEIGHT), rx=10, ry=10, fill="white", stroke="black", stroke_width=2))

        # Draw the card suit symbol
        symbol = svgwrite.text.Text(suit.upper(), insert=(x + 5, y + 15), fill="black", font_size="16px", font_weight="bold")
        dwg.add(symbol)

        # Draw the card value
        value = svgwrite.text.Text(value, insert=(x + 5, y + CARD_HEIGHT - 10), fill="black", font_size="16px", font_weight="bold")
        dwg.add(value)

# Convert the SVG drawing to a string
svg_string = dwg.tostring()

# Display the SVG canvas in the Streamlit app
st.write(f'<svg viewBox="0 0 {CANVAS_WIDTH} {CANVAS_HEIGHT}">{svg_string}</svg>', unsafe_allow_html=True)


import streamlit as st
from svglib.svglib import svg2rlg
from reportlab.graphics import renderPDF, renderPM
from io import BytesIO

# Define the SVG images as strings
svg_images = {
    'Fraser spiral': """
    <svg viewBox="-40 -40 80 80" xmlns="http://www.w3.org/2000/svg">
        <g stroke-width="0.4" stroke="black" fill="none">
            <path d="M40 0 Q 40 40 0 40 Q -40 40 -40 0 Q -40 -40 0 -40 Q 40 -40 40 0" />
            <path d="M-39 1 Q -39 -39 0 -39 Q 38 -39 39 -1" />
            <path d="M0 -39 Q 0 1 38 1" />
        </g>
    </svg>
    """,
    'Penrose triangle': """
    <svg viewBox="-100 -100 200 200" xmlns="http://www.w3.org/2000/svg">
        <g fill="none" stroke="black" stroke-width="4">
            <path d="M -60 60 L 60 60 L 0 -60 Z" />
            <path d="M -60 -60 L 60 -60 L 0 60 Z" />
            <path d="M -60 60 L -60 -60 L 60 0 Z" />
            <path d="M 60 60 L 60 -60 L -60 0 Z" />
        </g>
    </svg>
    """
}

# Define the functions to convert SVG to PNG
def svg_to_image(svg_string):
    drawing = svg2rlg(BytesIO(svg_string.encode()))
    img_data = BytesIO()
    renderPM.drawToFile(drawing, img_data, fmt="PNG")
    return img_data.getvalue()

# Define the app layout
st.title("SVG Optical Illusions")

# Display the SVG images and convert them to PNG
for name, svg_string in svg_images.items():
    st.subheader(name)
    svg = st.markdown(svg_string, unsafe_allow_html=True)
    png = svg_to_image(svg_string)
    st.image(png, use_column_width=True)