feat: handle snap function added

app/src/utils/handleSnap.ts

@@ -0,0 +1,65 @@
+import { useEffect } from "react";
+import { detectModifierKeys } from "./shortcutkeys/detectModifierKeys";
+
+// Define the props expected by the component
+type SnapControlsProps = {
+  x_point: number; // X-coordinate value to snap
+  z_point: number; // Z-coordinate value to snap
+};
+
+const SnapControls: React.FC<SnapControlsProps> = ({ x_point, z_point }) => {
+  useEffect(() => {
+    // Handler function for keypress events
+    const handleKeyPress = (event: KeyboardEvent) => {
+      // Detect which modifier keys (Ctrl, Shift, etc.) are currently pressed
+      const keyCombination = detectModifierKeys(event);
+
+      // Define the snapping distances
+      const CTRL_DISTANCE = 1; // Coarse snapping when Ctrl is pressed
+      const SHIFT_DISTANCE = 0.01; // Fine snapping when Shift is pressed
+
+      // Prevent default behavior to avoid unintended side effects
+      event.preventDefault();
+
+      // Create new coordinates to apply snapping to
+      let newX = x_point;
+      let newZ = z_point;
+
+      // Check for modifier key combinations and apply appropriate snapping logic
+      if (keyCombination) {
+        if (keyCombination === "Ctrl") {
+          // Snap to nearest integer unit
+          newX = Math.round(x_point / CTRL_DISTANCE) * CTRL_DISTANCE;
+          newZ = Math.round(z_point / CTRL_DISTANCE) * CTRL_DISTANCE;
+          return { newX, newZ };
+        }
+
+        if (keyCombination === "Ctrl+Shift") {
+          // Snap to nearest small unit (0.01)
+          newX = Math.round(x_point / SHIFT_DISTANCE) * SHIFT_DISTANCE;
+          newZ = Math.round(z_point / SHIFT_DISTANCE) * SHIFT_DISTANCE;
+          return { newX, newZ };
+        }
+
+        if (keyCombination === "Shift") {
+          // Incorrect snapping logic — rounding the point and multiplying by small value
+          newX = Math.round(x_point) * SHIFT_DISTANCE;
+          newZ = Math.round(z_point) * SHIFT_DISTANCE;
+          return { newX, newZ };
+        }
+      }
+    };
+
+    // Attach keydown event listener when the component mounts
+    window.addEventListener("keydown", handleKeyPress);
+
+    // Clean up the event listener when the component unmounts
+    return () => {
+      window.removeEventListener("keydown", handleKeyPress);
+    };
+  }, []); // Empty dependency array means this effect runs once on mount
+
+  return null; // This component doesn’t render anything
+};
+
+export default SnapControls;