feat: Add mcrfpy.step() and synchronous screenshot for headless mode (closes #153)
Implements Python-controlled simulation advancement for headless mode: - Add mcrfpy.step(dt) to advance simulation by dt seconds - step(None) advances to next scheduled event (timer/animation) - Timers use simulation_time in headless mode for deterministic behavior - automation.screenshot() now renders synchronously in headless mode (captures current state, not previous frame) This enables LLM agent orchestration (#156) by allowing: - Set perspective, take screenshot, query LLM - all synchronous - Deterministic simulation control without frame timing issues - Event-driven advancement with step(None) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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124
tests/unit/test_step_function.py
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tests/unit/test_step_function.py
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#!/usr/bin/env python3
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"""
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Test mcrfpy.step() function (#153)
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===================================
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Tests the Python-controlled simulation advancement for headless mode.
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Key behavior:
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- step(dt) advances simulation by dt seconds
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- step(None) or step() advances to next scheduled event
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- Returns actual time advanced
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- In windowed mode, returns 0.0 (no-op)
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"""
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import mcrfpy
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import sys
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def run_tests():
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"""Run step() function tests"""
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print("=== mcrfpy.step() Tests ===\n")
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# Test 1: step() with specific dt value
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print("Test 1: step() with specific dt value")
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dt = mcrfpy.step(0.1) # Advance 100ms
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print(f" step(0.1) returned: {dt}")
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# In headless mode, should return 0.1
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# In windowed mode, returns 0.0
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if dt == 0.0:
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print(" Note: Running in windowed mode - step() is no-op")
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else:
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assert abs(dt - 0.1) < 0.001, f"Expected ~0.1, got {dt}"
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print(" Correctly advanced by 0.1 seconds")
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print()
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# Test 2: step() with integer value (converts to float)
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print("Test 2: step() with integer value")
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dt = mcrfpy.step(1) # Advance 1 second
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print(f" step(1) returned: {dt}")
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if dt != 0.0:
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assert abs(dt - 1.0) < 0.001, f"Expected ~1.0, got {dt}"
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print(" Correctly advanced by 1.0 seconds")
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print()
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# Test 3: step(None) - advance to next event
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print("Test 3: step(None) - advance to next event")
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dt = mcrfpy.step(None)
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print(f" step(None) returned: {dt}")
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if dt != 0.0:
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assert dt >= 0, "step(None) should return non-negative dt"
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print(f" Advanced by {dt} seconds to next event")
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print()
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# Test 4: step() with no argument (same as step(None))
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print("Test 4: step() with no argument")
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dt = mcrfpy.step()
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print(f" step() returned: {dt}")
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if dt != 0.0:
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assert dt >= 0, "step() should return non-negative dt"
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print(f" Advanced by {dt} seconds")
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print()
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# Test 5: Timer callback with step()
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print("Test 5: Timer fires after step() advances past interval")
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timer_fired = [False] # Use list for mutable closure
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def on_timer(runtime):
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"""Timer callback - receives runtime in ms"""
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timer_fired[0] = True
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print(f" Timer fired at simulation time={runtime}ms")
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# Set a timer for 500ms
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mcrfpy.setTimer("test_timer", on_timer, 500)
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# Step 600ms - timer should fire (500ms interval + some buffer)
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dt = mcrfpy.step(0.6)
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if dt != 0.0: # Headless mode
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# Timer should have fired
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if timer_fired[0]:
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print(" Timer correctly fired after step(0.6)")
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else:
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# Try another step to ensure timer fires
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mcrfpy.step(0.1)
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if timer_fired[0]:
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print(" Timer fired after additional step")
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else:
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print(" WARNING: Timer didn't fire - check timer synchronization")
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else:
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print(" Skipping timer test in windowed mode")
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# Clean up
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mcrfpy.delTimer("test_timer")
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print()
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# Test 6: Error handling - invalid argument type
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print("Test 6: Error handling - invalid argument type")
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try:
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mcrfpy.step("invalid")
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print(" ERROR: Should have raised TypeError")
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return False
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except TypeError as e:
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print(f" Correctly raised TypeError: {e}")
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print()
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print("=== All step() Tests Passed! ===")
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return True
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# Main execution
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if __name__ == "__main__":
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try:
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# Create a scene for the test
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mcrfpy.createScene("test_step")
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mcrfpy.setScene("test_step")
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if run_tests():
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print("\nPASS")
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sys.exit(0)
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else:
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print("\nFAIL")
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sys.exit(1)
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except Exception as e:
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print(f"\nFAIL: {e}")
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import traceback
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traceback.print_exc()
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sys.exit(1)
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133
tests/unit/test_synchronous_screenshot.py
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tests/unit/test_synchronous_screenshot.py
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#!/usr/bin/env python3
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"""
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Test synchronous screenshot in headless mode (#153)
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====================================================
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Tests that automation.screenshot() captures the CURRENT state in headless mode,
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not the previous frame's buffer.
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Key behavior:
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- In headless mode, screenshot() renders then captures (synchronous)
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- Changes made before screenshot() are visible in the captured image
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- No timer dance required to capture current state
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"""
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import mcrfpy
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from mcrfpy import automation
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import sys
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import os
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def run_tests():
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"""Run synchronous screenshot tests"""
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print("=== Synchronous Screenshot Tests ===\n")
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# Create a test scene with UI elements
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mcrfpy.createScene("screenshot_test")
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mcrfpy.setScene("screenshot_test")
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ui = mcrfpy.sceneUI("screenshot_test")
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# Test 1: Basic screenshot works
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print("Test 1: Basic screenshot functionality")
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test_file = "/tmp/test_screenshot_basic.png"
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if os.path.exists(test_file):
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os.remove(test_file)
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result = automation.screenshot(test_file)
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assert result == True, f"screenshot() should return True, got {result}"
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assert os.path.exists(test_file), "Screenshot file should exist"
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file_size = os.path.getsize(test_file)
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assert file_size > 0, "Screenshot file should not be empty"
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print(f" Screenshot saved: {test_file} ({file_size} bytes)")
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print()
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# Test 2: Screenshot captures current state (not previous frame)
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print("Test 2: Screenshot captures current state immediately")
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# Add a visible frame
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frame1 = mcrfpy.Frame(pos=(100, 100), size=(200, 200))
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frame1.fill_color = mcrfpy.Color(255, 0, 0) # Red
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ui.append(frame1)
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# Take screenshot immediately - should show the red frame
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test_file2 = "/tmp/test_screenshot_state1.png"
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if os.path.exists(test_file2):
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os.remove(test_file2)
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result = automation.screenshot(test_file2)
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assert result == True, "screenshot() should return True"
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assert os.path.exists(test_file2), "Screenshot file should exist"
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print(f" Screenshot with red frame: {test_file2}")
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# Modify the frame color
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frame1.fill_color = mcrfpy.Color(0, 255, 0) # Green
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# Take another screenshot - should show green, not red
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test_file3 = "/tmp/test_screenshot_state2.png"
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if os.path.exists(test_file3):
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os.remove(test_file3)
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result = automation.screenshot(test_file3)
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assert result == True, "screenshot() should return True"
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assert os.path.exists(test_file3), "Screenshot file should exist"
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print(f" Screenshot with green frame: {test_file3}")
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print()
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# Test 3: Multiple screenshots in succession
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print("Test 3: Multiple screenshots in succession")
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screenshot_files = []
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for i in range(3):
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frame1.fill_color = mcrfpy.Color(i * 80, i * 80, i * 80) # Varying gray
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test_file_n = f"/tmp/test_screenshot_seq{i}.png"
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if os.path.exists(test_file_n):
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os.remove(test_file_n)
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result = automation.screenshot(test_file_n)
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assert result == True, f"screenshot() {i} should return True"
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assert os.path.exists(test_file_n), f"Screenshot {i} should exist"
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screenshot_files.append(test_file_n)
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print(f" Created {len(screenshot_files)} sequential screenshots")
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# Verify all files are different sizes or exist
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sizes = [os.path.getsize(f) for f in screenshot_files]
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print(f" File sizes: {sizes}")
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print()
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# Test 4: Screenshot after step()
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print("Test 4: Screenshot works correctly after step()")
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mcrfpy.step(0.1) # Advance simulation
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test_file4 = "/tmp/test_screenshot_after_step.png"
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if os.path.exists(test_file4):
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os.remove(test_file4)
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result = automation.screenshot(test_file4)
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assert result == True, "screenshot() after step() should return True"
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assert os.path.exists(test_file4), "Screenshot after step() should exist"
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print(f" Screenshot after step(): {test_file4}")
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print()
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# Clean up test files
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print("Cleaning up test files...")
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for f in [test_file, test_file2, test_file3, test_file4] + screenshot_files:
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if os.path.exists(f):
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os.remove(f)
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print()
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print("=== All Synchronous Screenshot Tests Passed! ===")
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return True
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# Main execution
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if __name__ == "__main__":
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try:
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if run_tests():
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print("\nPASS")
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sys.exit(0)
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else:
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print("\nFAIL")
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sys.exit(1)
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except Exception as e:
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print(f"\nFAIL: {e}")
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import traceback
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traceback.print_exc()
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sys.exit(1)
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