Implement physics and collisions related to belly sliding

Co-authored-by: r3cp3ct <45179536+r3cp3ct@users.noreply.github.com>
Co-authored-by: sigonasr2 <sigonasr2@gmail.com>

src/sig/objects/Player.java

@@ -6,6 +6,7 @@ import sig.engine.Panel;
 import sig.engine.Rectangle;
 import sig.engine.Sprite;
 import sig.engine.Transform;
+import sig.engine.objects.AnimatedObject;
 import sig.map.Map;
 import sig.map.Tile;
 import sig.map.View;
@@ -396,6 +397,28 @@ public class Player extends PhysicsObject{
         RabiClone.level_renderer.setY(newY < 0 ? 0 : newY);
     }
 
+    @Override
+    public void collisionEvent(AnimatedObject obj) {
+        if (state==State.BELLYSLIDE) {
+            if(obj instanceof PhysicsObject){
+                PhysicsObject pobj = (PhysicsObject)obj;
+                if(pobj.state!=State.STAGGER){
+                    if(facing_direction){
+                        pobj.staggerDuration=0.3;
+                        pobj.x_velocity = -300;
+                        pobj.y_velocity = -120;
+                        pobj.state = State.STAGGER;
+                    }else{
+                        pobj.staggerDuration=0.3;
+                        pobj.x_velocity = 300;
+                        pobj.y_velocity = -120;
+                        pobj.state = State.STAGGER;
+                    }
+                }
+            }
+        }
+    }
+
     @Override
     public void draw(byte[] p) {
     }

src/sig/objects/actor/PhysicsObject.java

@@ -61,10 +61,12 @@ public abstract class PhysicsObject extends AnimatedObject implements PhysicsObj
             Math.abs(x_velocity+x_acceleration*updateMult)>x_velocity_limit
                 ?Math.signum(x_velocity+x_acceleration*updateMult)*x_velocity_limit
                 :x_velocity+x_acceleration*updateMult;
-        y_velocity =
-            Math.abs(y_velocity+y_acceleration*updateMult)>y_velocity_limit
-                ?Math.signum(y_velocity+y_acceleration*updateMult)*y_velocity_limit
-                :y_velocity+y_acceleration*updateMult;
+        if (state!=State.BELLYSLIDE) {
+            y_velocity =
+                Math.abs(y_velocity+y_acceleration*updateMult)>y_velocity_limit
+                    ?Math.signum(y_velocity+y_acceleration*updateMult)*y_velocity_limit
+                    :y_velocity+y_acceleration*updateMult;
+        }
         double displacement_y = y_velocity*updateMult;
         double displacement_x = x_velocity*updateMult;
 
@@ -132,9 +134,6 @@ public abstract class PhysicsObject extends AnimatedObject implements PhysicsObj
             if(y_velocity>0 && state!=State.SLIDE&&state!=State.BELLYSLIDE){
                 state = State.FALLING;
             }
-            if (y_velocity>FALLING_SPEED_LIMIT&&state!=State.BELLYSLIDE) {
-                y_velocity=FALLING_SPEED_LIMIT;
-            }
             if (!sideCollision) {
                 handleKeyboardMovement(updateMult, right-left, horizontal_air_friction, horizontal_air_drag);
                 this.setX(this.getX()+displacement_x);

src/sig/objects/weapons/KnifeSwing.java

@@ -34,7 +34,6 @@ public class KnifeSwing extends AttachableObject{
 
     @Override
     public void collisionEvent(AnimatedObject obj) {
-        //System.out.println("Bonk");
         if(obj instanceof PhysicsObject){
             PhysicsObject pobj = (PhysicsObject)obj;
             if(pobj.state!=State.STAGGER){

src/sig/objects/weapons/KnifeSwing2.java

@@ -34,7 +34,6 @@ public class KnifeSwing2 extends AttachableObject{
 
     @Override
     public void collisionEvent(AnimatedObject obj) {
-        //System.out.println("Bonk");
         if(obj instanceof PhysicsObject){
             PhysicsObject pobj = (PhysicsObject)obj;
             if(pobj.state!=State.STAGGER){