From 4ff13ec965927ee7a4c7de68a928620fde101d1d Mon Sep 17 00:00:00 2001
From: Joshua Sigona <sigonasr2@gmail.com>
Date: Mon, 6 Jul 2020 06:23:08 +0900
Subject: [PATCH] Update physics / acceleration to handle horizontal speeds +
 friction surfaces.

---
 assets/Scenes/TestLevel.j3o               | Bin 92281 -> 92397 bytes
 build/classes/mygame/Main.class           | Bin 5159 -> 5266 bytes
 src/mygame/camera/CustomChaseCamera.java  |   2 +-
 src/mygame/control/PhysicsControl.java    |  71 +++++++++++++++++++++-
 src/mygame/control/PlayableCharacter.java |  40 ++++++------
 5 files changed, 89 insertions(+), 24 deletions(-)

diff --git a/assets/Scenes/TestLevel.j3o b/assets/Scenes/TestLevel.j3o
index 65061fd7b9389bac59378c9a2c04c49806f8d78f..fb1b72759b0cc1b91605d3c85ff3cfc0da3823df 100644
GIT binary patch
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diff --git a/build/classes/mygame/Main.class b/build/classes/mygame/Main.class
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diff --git a/src/mygame/camera/CustomChaseCamera.java b/src/mygame/camera/CustomChaseCamera.java
index 478fa7c..e69d42e 100644
--- a/src/mygame/camera/CustomChaseCamera.java
+++ b/src/mygame/camera/CustomChaseCamera.java
@@ -58,6 +58,6 @@ public class CustomChaseCamera extends ChaseCamera{
             }
         }
         distance = targetDistance;
-            System.out.println(targetDistance);
+        //System.out.println(targetDistance);
     }
 }
diff --git a/src/mygame/control/PhysicsControl.java b/src/mygame/control/PhysicsControl.java
index c6febb6..53ba587 100644
--- a/src/mygame/control/PhysicsControl.java
+++ b/src/mygame/control/PhysicsControl.java
@@ -12,6 +12,7 @@ import com.jme3.renderer.RenderManager;
 import com.jme3.renderer.ViewPort;
 import com.jme3.renderer.queue.RenderQueue;
 import com.jme3.renderer.queue.RenderQueue.ShadowMode;
+import com.jme3.scene.Geometry;
 import com.jme3.scene.Node;
 import com.jme3.scene.Spatial;
 import com.jme3.scene.control.AbstractControl;
@@ -23,14 +24,22 @@ import static mygame.appstate.RunLevel.world;
 
 public class PhysicsControl extends AbstractControl implements Savable, Cloneable {
     
+    final static float FRICTION = 0.4f;
+    
     float jumpSpd = 0.1f;
     float vspd = 0.0f;
+    float hspd = 0.0f; //Determines movement along the Z axis.
     float gravity = -0.25f;
     
+    float acceleration = 80f; //80 units/s acceleration.
+    float maxSpd = 10f; //Default max speed is 10.
+    
     float modelHeight = 2.5f;
     
     float walkOffTime = 0.25f; //How long you can jump after becoming airborne.
     float airTime = 0.0f; //Amount of time in air.
+    
+    Geometry standingOn;
 
     public PhysicsControl(float jumpSpd, float gravity, float modelHeight){
         this.jumpSpd=jumpSpd;
@@ -62,8 +71,21 @@ public class PhysicsControl extends AbstractControl implements Savable, Cloneabl
         } else {
             vspd=0;
             airTime=0;
+            if (standingOn!=null && standingOn.getUserData("friction")!=null) {
+                if (hspd<0) {
+                    hspd=Math.min(hspd+(float)standingOn.getUserData("friction"),0);
+                } else {
+                    hspd=Math.max(hspd-(float)standingOn.getUserData("friction"),0);
+                }
+            } else {
+                if (hspd<0) {
+                    hspd=Math.min(hspd+FRICTION,0);
+                } else {
+                    hspd=Math.max(hspd-FRICTION,0);
+                }
+            }
         }
-        spatial.move(0,vspd,0);
+        spatial.move(0,vspd,hspd*tpf);
     }
 
     @Override
@@ -112,6 +134,52 @@ public class PhysicsControl extends AbstractControl implements Savable, Cloneabl
         return vspd;
     }
     
+    void addHorizontalSpeed(float spd) {
+        hspd += spd;
+    }
+    void setHorizontalSpeed(float spd) {
+        hspd = spd;
+    }
+    
+    void setAcceleration(float value) {
+        acceleration = value;
+    }
+    void setMaxSpd(float value) {
+        maxSpd = value;
+    }
+    
+    float getAcceleration() {
+        return acceleration;
+    }
+    float getMaxSpd() {
+        return maxSpd;
+    }
+    
+    /***
+     * 
+     * @param positive Use false if we are accelerating in the -Z direction. (Left). Use true to say we are accelerating to the right.
+     * @param tpf 
+     */
+    void accelerate(boolean right, float tpf) {
+        if (right) {
+            if (hspd+acceleration*tpf<maxSpd) {
+                hspd += acceleration*tpf;
+            } else {
+                hspd = maxSpd;
+            }
+        } else {
+            if (hspd-acceleration*tpf>-maxSpd) {
+                hspd -= acceleration*tpf;
+            } else {
+                hspd = -maxSpd;
+            }
+        }
+    }
+    
+    float getHorizontalSpeed() {
+        return hspd;
+    }
+    
     boolean isOnGround() {
         if (vspd>0) {
             //System.out.println(vspd);
@@ -137,6 +205,7 @@ public class PhysicsControl extends AbstractControl implements Savable, Cloneabl
                 //System.out.println(newResults.getClosestCollision());
                 if (newResults.getClosestCollision().getDistance()<=(modelHeight/2)+0.1-vspd) {
                     spatial.setLocalTranslation(newResults.getClosestCollision().getContactPoint());
+                    standingOn = newResults.getClosestCollision().getGeometry();
                     return true;
                 } else {
                     return false;
diff --git a/src/mygame/control/PlayableCharacter.java b/src/mygame/control/PlayableCharacter.java
index 60ec6a5..252494d 100644
--- a/src/mygame/control/PlayableCharacter.java
+++ b/src/mygame/control/PlayableCharacter.java
@@ -52,7 +52,7 @@ public class PlayableCharacter extends AbstractControl implements Savable, Clone
     AnimControl control;
     
     PhysicsControl physics;
-    Vector3f walkDirection;
+    Vector3f walkDirection = Vector3f.ZERO.clone();
     
     float lastActionPerformed = 0.0f;
     static final float FREECAMERATIME = 0.5f;
@@ -115,7 +115,15 @@ public class PlayableCharacter extends AbstractControl implements Savable, Clone
         /*if (this instanceof NetworkPlayableCharacter) {
             System.out.println("1:"+getWalkDirection()+"Moving:"+moving+"/"+strafingLeft+"/"+strafingRight+"/"+walkingBackward+"/"+walkingForward);
         }*/
-        main.getCamera().setLocation(spatial.getLocalTranslation().add(-20,7f,0));
+        //main.getCamera().setLocation(spatial.getLocalTranslation().add(-20,7f,0));
+        if (physics.getHorizontalSpeed()!=0.0f) {
+            SmoothMoveWalk(walkDirection, tpf);
+            //Message msg = new PlayerPositionMessage(spatial.getLocalTranslation());
+            //main.client.send(msg);
+        } else {
+            channel.setAnim("stand");
+            channel.setLoopMode(LoopMode.DontLoop);
+        }
         if (moving) {
             if (!(this instanceof NetworkPlayableCharacter)) {
                 cameraTransition+=tpf*4;
@@ -129,22 +137,10 @@ public class PlayableCharacter extends AbstractControl implements Savable, Clone
             
             moving=false;
             
-            if (this instanceof NetworkPlayableCharacter) {
-                walkDirection = getWalkDirection((Vector3f)spatial.getUserData("lastCamDir"),(Vector3f)spatial.getUserData("lastCamLeftDir"));
-            } else {
-                walkDirection = getWalkDirection(main.getCamera().getDirection(),main.getCamera().getLeft());
-            }
+            walkDirection = getWalkDirection(tpf);
             /*if (this instanceof NetworkPlayableCharacter) {
                 System.out.println(" 2:"+getWalkDirection()+"Moving:"+moving+"/"+strafingLeft+"/"+strafingRight+"/"+walkingBackward+"/"+walkingForward);
             }*/
-            if (moving) {
-                SmoothMoveWalk(walkDirection, tpf);
-                //Message msg = new PlayerPositionMessage(spatial.getLocalTranslation());
-                //main.client.send(msg);
-            } else {
-                channel.setAnim("stand");
-                channel.setLoopMode(LoopMode.DontLoop);
-            }
         } else {
             if (!(this instanceof NetworkPlayableCharacter)) {
                 //System.out.println(spatial.getControl(CustomChaseCamera.class).getHorizontalRotation()+","+(spatial.getControl(CustomChaseCamera.class).getHorizontalRotation()%(2*Math.PI)));
@@ -269,18 +265,18 @@ public class PlayableCharacter extends AbstractControl implements Savable, Clone
     public void onAnimChange(AnimControl control, AnimChannel channel, String animName) {
     }
 
-    public Vector3f getWalkDirection(Vector3f camDir, Vector3f camLeftDir) {
-        camDir.y=0; camDir.normalizeLocal();
-        camLeftDir.y=0; camLeftDir.normalizeLocal();
-
-        Vector3f walkDirection = new Vector3f(0,0,0);
+    public Vector3f getWalkDirection(float tpf) {
         
         if (strafingLeft) {
-            walkDirection.addLocal(0,0,-1);
+            this.walkDirection.setZ(-1);
+            //physics.setHorizontalSpeed(-speed);
+            physics.accelerate(false, tpf);
             moving=true;
         }
         if (strafingRight) {
-            walkDirection.addLocal(0,0,1);
+            this.walkDirection.setZ(1);
+            //physics.setHorizontalSpeed(speed);
+            physics.accelerate(true, tpf);
             moving=true;
         }