Add input validation and fix Entity repr

- #212: Add GRID_MAX (8192) validation to Grid, ColorLayer, TileLayer
- #213: Validate color components are in 0-255 range
- #214: Add null pointer checks before HeightMap operations
- #216: Change entities_in_radius(x, y, radius) to (pos, radius)
- #217: Fix Entity __repr__ to show actual draw_pos float values

Closes #212, closes #213, closes #214, closes #216, closes #217

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tests/regression/issue_212_to_217_test.py

@@ -0,0 +1,122 @@
+"""Regression tests for issues #212, #213, #214, #216, #217"""
+import mcrfpy
+import sys
+
+passed = 0
+failed = 0
+
+def test(name, condition, expected=True):
+    global passed, failed
+    if condition == expected:
+        print(f"  PASS: {name}")
+        passed += 1
+    else:
+        print(f"  FAIL: {name}")
+        failed += 1
+
+print("Testing #212: GRID_MAX validation")
+# Grid dimensions cannot exceed 8192
+try:
+    g = mcrfpy.Grid(grid_size=(10000, 10000))
+    test("Grid rejects oversized dimensions", False)  # Should have raised
+except ValueError as e:
+    test("Grid rejects oversized dimensions", "8192" in str(e))
+
+# ColorLayer dimensions cannot exceed 8192
+try:
+    cl = mcrfpy.ColorLayer(z_index=0, grid_size=(10000, 100))
+    test("ColorLayer rejects oversized dimensions", False)
+except ValueError as e:
+    test("ColorLayer rejects oversized dimensions", "8192" in str(e))
+
+# TileLayer dimensions cannot exceed 8192
+try:
+    tl = mcrfpy.TileLayer(z_index=0, grid_size=(100, 10000))
+    test("TileLayer rejects oversized dimensions", False)
+except ValueError as e:
+    test("TileLayer rejects oversized dimensions", "8192" in str(e))
+
+# Valid dimensions should work
+try:
+    g = mcrfpy.Grid(grid_size=(100, 100))
+    test("Grid accepts valid dimensions", True)
+except:
+    test("Grid accepts valid dimensions", False)
+
+
+print("\nTesting #213: Color component validation (0-255)")
+# ColorLayer.fill with invalid color
+try:
+    cl = mcrfpy.ColorLayer(z_index=0, grid_size=(10, 10))
+    cl.fill((300, 0, 0))
+    test("ColorLayer.fill rejects color > 255", False)
+except ValueError as e:
+    test("ColorLayer.fill rejects color > 255", "0-255" in str(e))
+
+try:
+    cl = mcrfpy.ColorLayer(z_index=0, grid_size=(10, 10))
+    cl.fill((-10, 0, 0))
+    test("ColorLayer.fill rejects color < 0", False)
+except ValueError as e:
+    test("ColorLayer.fill rejects color < 0", "0-255" in str(e))
+
+# Valid color should work
+try:
+    cl = mcrfpy.ColorLayer(z_index=0, grid_size=(10, 10))
+    cl.fill((128, 64, 200, 255))
+    test("ColorLayer.fill accepts valid color", True)
+except:
+    test("ColorLayer.fill accepts valid color", False)
+
+
+print("\nTesting #216: entities_in_radius uses pos tuple/Vector")
+try:
+    g = mcrfpy.Grid(grid_size=(50, 50), pos=(0, 0), size=(500, 500))
+    e = mcrfpy.Entity()
+    e.draw_pos = (10, 10)
+    g.entities.append(e)
+
+    # New API: pos as tuple + radius
+    result = g.entities_in_radius((10, 10), 5.0)
+    test("entities_in_radius accepts (pos_tuple, radius)", len(result) == 1)
+
+    # Also works with Vector
+    result = g.entities_in_radius(mcrfpy.Vector(10, 10), 5.0)
+    test("entities_in_radius accepts (Vector, radius)", len(result) == 1)
+
+    # Old API should fail
+    try:
+        result = g.entities_in_radius(10, 10, 5.0)
+        test("entities_in_radius rejects old (x, y, radius) API", False)
+    except TypeError:
+        test("entities_in_radius rejects old (x, y, radius) API", True)
+except Exception as e:
+    print(f"  ERROR in #216 tests: {e}")
+    failed += 3
+
+
+print("\nTesting #217: Entity __repr__ shows actual position")
+try:
+    e = mcrfpy.Entity()
+    e.draw_pos = (5.5, 3.25)
+    repr_str = repr(e)
+    test("Entity repr shows draw_pos", "draw_pos=" in repr_str)
+    test("Entity repr shows actual float x", "5.5" in repr_str)
+    test("Entity repr shows actual float y", "3.25" in repr_str)
+
+    # draw_pos should be accessible without grid
+    pos = e.draw_pos
+    test("draw_pos accessible without grid", abs(pos.x - 5.5) < 0.01)
+except Exception as e:
+    print(f"  ERROR in #217 tests: {e}")
+    failed += 4
+
+
+print(f"\n{'='*50}")
+print(f"Results: {passed} passed, {failed} failed")
+
+if failed > 0:
+    sys.exit(1)
+else:
+    print("All tests passed!")
+    sys.exit(0)