added a sinking effect for damaged ships

Projekte/battleship/client/src/main/java/pp/battleship/client/gui/ShipSinkingControl.java

@@ -0,0 +1,116 @@
+package pp.battleship.client.gui;
+
+import com.jme3.math.FastMath;
+import com.jme3.math.Quaternion;
+import com.jme3.math.Vector3f;
+import com.jme3.renderer.RenderManager;
+import com.jme3.renderer.ViewPort;
+import com.jme3.scene.Node;
+import com.jme3.scene.Spatial;
+import com.jme3.scene.control.AbstractControl;
+
+/**
+ * Controls the burning, tilting, and sinking behavior of a battleship.
+ * The ship will burn and tilt for a specified duration, then sink below the water surface.
+ */
+public class ShipSinkingControl extends AbstractControl {
+
+    private float elapsedTime = 0f;
+    private final float burnTiltDuration;
+    private final float sinkDuration;
+    private final float sinkDepth;
+    private final float tiltAngle;
+    private final Vector3f initialPosition;
+    private boolean sinkingStarted = false;
+
+    /**
+     * Constructs a new ShipSinkingControl instance.
+     *
+     * @param burnTiltDuration Time in seconds for the ship to burn and tilt on the surface
+     * @param sinkDuration     Time in seconds for the ship to fully sink
+     * @param sinkDepth        Depth below the water to sink the ship
+     * @param tiltAngle        Final tilt angle in degrees
+     */
+    public ShipSinkingControl(float burnTiltDuration, float sinkDuration, float sinkDepth, float tiltAngle) {
+        this.burnTiltDuration = burnTiltDuration;
+        this.sinkDuration = sinkDuration;
+        this.sinkDepth = sinkDepth;
+        this.tiltAngle = tiltAngle;
+        this.initialPosition = new Vector3f(); // Placeholder; will be set in controlUpdate
+    }
+
+    /**
+     * Overrides controlUpdate in AbstractControl
+     * regulates the burn and tilt timeframe
+     * @param tpf time per frame (in seconds)
+     */
+
+    @Override
+    protected void controlUpdate(float tpf) {
+        if (spatial == null) return;
+
+        elapsedTime += tpf;
+
+        if (elapsedTime < burnTiltDuration) {
+            float progress = elapsedTime / burnTiltDuration;
+
+            float angleInRadians = FastMath.DEG_TO_RAD * FastMath.interpolateLinear(progress, 0f, -tiltAngle);
+            Quaternion tiltRotation = new Quaternion().fromAngles(angleInRadians, 0, 0);
+            spatial.setLocalRotation(tiltRotation);
+            return;
+        }
+
+        // Start sinking if it hasn't started yet
+        if (!sinkingStarted) {
+            sinkingStarted = true;
+            // Save the initial position when sinking starts
+            initialPosition.set(spatial.getLocalTranslation());
+
+            // Remove the hitEffectNode
+            Node parentNode = (Node) spatial;
+            Spatial hitEffects = parentNode.getChild("HitEffectNode");
+            if (hitEffects != null) {
+                parentNode.detachChild(hitEffects);
+            }
+        }
+
+        // Calculate the progress of the sinking (0 to 1)
+        float progress = Math.min((elapsedTime - burnTiltDuration) / sinkDuration, 1f);
+
+        // Apply the tilt angle (remains constant during sinking)
+        Quaternion tiltRotation = new Quaternion().fromAngles(-FastMath.DEG_TO_RAD * tiltAngle, 0, 0);
+        spatial.setLocalRotation(tiltRotation);
+
+        // Sink the ship by interpolating the Y position
+        float currentY = FastMath.interpolateLinear(progress, initialPosition.y, sinkDepth);
+        spatial.setLocalTranslation(initialPosition.x, currentY, initialPosition.z);
+
+        if (currentY <= sinkDepth) {
+            Node parentNode = (Node) spatial.getParent();
+            if (parentNode != null) {
+                parentNode.detachChild(spatial);
+            }
+            spatial.removeControl(this);
+        }
+    }
+
+    /**
+     * This method is called during the rendering phase, but it does not perform any
+     * operations in this implementation as the control only influences the spatial's
+     * transformation, not its rendering process.
+     *
+     * @param rm the RenderManager rendering the controlled Spatial (not null)
+     * @param vp the ViewPort being rendered (not null)
+     */
+    @Override
+    protected void controlRender(RenderManager rm, ViewPort vp) {
+        // No rendering logic is needed for this control
+    }
+
+    /**
+     * Starts the sinking process for the ship.
+     */
+    public void startSinking() {
+        // Nothing to do here as the control update handles the timing and sequence
+    }
+}