Simulation Testing

Purpose

Run cardiac model HTML simulations with WebGL support and capture the auto-downloaded voltage trace PNG.

Instructions

1. Running a Simulation:

• •The cardiac model HTML includes a saveVoltage(time) function that auto-downloads voltage_trace_{time}ms.png
• •Use Playwright to open the simulation and wait for the download

2. Key Requirements:

• •WebGL simulations require headed mode (headless=False) for proper GPU rendering
• •Set up a download handler to capture the auto-downloaded PNG
• •Run simulation long enough for saveVoltage() to trigger (default: 1000ms simulation time)

3. Example Usage:

from playwright.sync_api import sync_playwright
import time
import os

output_dir = "outputs"

with sync_playwright() as p:
    browser = p.chromium.launch(
        headless=False,
        args=['--enable-webgl', '--use-gl=angle']
    )
    context = browser.new_context(accept_downloads=True)
    page = context.new_page()

    # Navigate to the simulation
    page.goto(f"file:///{file_path}")
    page.wait_for_load_state('networkidle')

    # Wait for the auto-download from saveVoltage()
    with page.expect_download() as download_info:
        # Let simulation run until saveVoltage triggers
        time.sleep(15)

    # Save the downloaded file
    download = download_info.value
    download.save_as(os.path.join(output_dir, download.suggested_filename))

    browser.close()

4. Parameters:

• •file_path: Path to the cardiac model HTML file
• •output_dir: Where to save the downloaded voltage trace
• •run_time: Real-time seconds to run (default 15s, adjust based on simulation speed)

Output

• •Saves the auto-downloaded voltage_trace_{time}ms.png to specified output folder