Implement drag and friction for ground movement

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

src/sig/engine/Panel.java

@@ -1,13 +1,10 @@
 package sig.engine;
 import java.awt.Graphics;
-import java.awt.GraphicsConfiguration;
-import java.awt.GraphicsEnvironment;
 import java.awt.Image;
 import java.awt.Toolkit;
 import java.awt.image.ColorModel;
 import java.awt.image.MemoryImageSource;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;
 import java.awt.event.KeyEvent;

src/sig/objects/LevelRenderer.java

@@ -28,12 +28,12 @@ public class LevelRenderer extends Object{
         int left = KeyHeld(KeyEvent.VK_LEFT)||KeyHeld(KeyEvent.VK_A)?1:0;
         int up = KeyHeld(KeyEvent.VK_UP)||KeyHeld(KeyEvent.VK_W)?1:0;
         int down = KeyHeld(KeyEvent.VK_DOWN)||KeyHeld(KeyEvent.VK_S)?1:0;
-        if (right-left!=0) {
+        /*if (right-left!=0) {
             setX(getX()+(right-left)*512*updateMult);
         }
         if (up-down!=0) {
             setY(getY()+(down-up)*512*updateMult);
-        }
+        }*/
         boolean left_mb = MouseHeld(MouseEvent.BUTTON1);
         boolean middle_mb = MouseHeld(MouseEvent.BUTTON2);
         boolean right_mb = MouseHeld(MouseEvent.BUTTON3);
@@ -46,6 +46,7 @@ public class LevelRenderer extends Object{
             Map.SaveMap(RabiClone.CURRENT_MAP);
             System.out.println("Map saved");
         }
+        setX(RabiClone.player.getX()-RabiClone.BASE_WIDTH/2);
         setY(RabiClone.player.getY()-RabiClone.BASE_HEIGHT*(2/3d));
     }
 

src/sig/objects/Player.java

@@ -7,11 +7,20 @@ import sig.engine.Sprite;
 import sig.map.CollisionType;
 import sig.map.Tile;
 
+import java.awt.event.KeyEvent;
+
 public class Player extends Object{
-    double y_acceleration = 9000;
+    double y_acceleration = 90;
+    double y_acceleration_limit = 100;
     double x_acceleration = 0;
+    double x_acceleration_limit = 100;
     double x_velocity = 0;
+    double x_velocity_limit = 128;
     double y_velocity = 5;
+    double y_velocity_limit = 192;
+
+    double horizontal_drag = 2000;
+    double horizontal_friction = 500;
 
     public Player(Panel panel) {
         super(panel);
@@ -23,15 +32,27 @@ public class Player extends Object{
 
     @Override
     public void update(double updateMult) {
-        y_velocity += y_acceleration*updateMult;
+        int right = KeyHeld(KeyEvent.VK_RIGHT)?1:0;
+        int left = KeyHeld(KeyEvent.VK_LEFT)?1:0;
+
+
+        x_velocity = 
+            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;
         double displacement = y_velocity*updateMult;
         boolean is_collision = false;
         for(int i=0;i<4;i++){
             double check_distance = (displacement/4)*(i+1);
             Tile checked_tile_top = RabiClone.CURRENT_MAP.getTile((int)getX()/Tile.TILE_WIDTH, (int)(getY()+check_distance)/Tile.TILE_HEIGHT);
-            Tile checked_tile_bottom = RabiClone.CURRENT_MAP.getTile((int)(getX()+getSprite().getWidth())/Tile.TILE_WIDTH, (int)(getY()+getSprite().getHeight()/2+check_distance)/Tile.TILE_HEIGHT);
+            Tile checked_tile_bottom_right = RabiClone.CURRENT_MAP.getTile((int)(getX()+getSprite().getWidth()/2)/Tile.TILE_WIDTH, (int)(getY()+getSprite().getHeight()/2+check_distance)/Tile.TILE_HEIGHT);
+            Tile checked_tile_bottom_left = RabiClone.CURRENT_MAP.getTile((int)(getX()-getSprite().getWidth()/2)/Tile.TILE_WIDTH, (int)(getY()+getSprite().getHeight()/2+check_distance)/Tile.TILE_HEIGHT);
             //System.out.println((int)getX()/Tile.TILE_WIDTH);
-            if(checked_tile_bottom.getCollision()==CollisionType.BLOCK){
+            if(checked_tile_bottom_right.getCollision()==CollisionType.BLOCK||checked_tile_bottom_left.getCollision()==CollisionType.BLOCK){
                 setY((getY()+check_distance));
                 y_acceleration = 0;
                 y_velocity = 0;
@@ -41,7 +62,23 @@ public class Player extends Object{
         }
         if (!is_collision){
             this.setY(this.getY()+displacement);
+        } else {
+            if (right-left!=0) {
+                x_acceleration=horizontal_drag*updateMult*(right-left);
+            } else {
+                if (x_velocity!=0) {
+                    x_velocity=x_velocity>0
+                        ?x_velocity-horizontal_friction*updateMult>0
+                            ?x_velocity-horizontal_friction*updateMult
+                            :0
+                        :x_velocity+horizontal_friction*updateMult<0
+                            ?x_velocity+horizontal_friction*updateMult
+                            :0;
                 }
+                x_acceleration=0;
+            }
+        }
+        this.setX(this.getX()+x_velocity*updateMult);
     }
 
     @Override