Fixed all processing related errors

src/Car.java

@@ -1,11 +1,12 @@
-import processing.core.*;
 import java.util.ArrayList;
 
 import static java.lang.Math.PI;
 import static processing.core.PApplet.degrees;
 import static processing.core.PApplet.radians;
+import processing.core.PVector;
+import processing.core.PApplet;
 
-public class Car{
+public class Car extends PApplet{
     PVector pose = new PVector(0,0); // the car's x, y position
     float angle = 0; // the current angle that the car is at.
     int carLength = 50;

src/SLAM.java

@@ -2,7 +2,9 @@ import processing.core.*;
 
 import java.util.ArrayList;
 
-public class SLAM{
+import static processing.core.PApplet.pow;
+
+public class SLAM extends PApplet{
     ArrayList<PVector> points = new ArrayList<PVector>();
 
     SLAM(){
@@ -39,7 +41,7 @@ class Line{
         for(PVector point : points){
             mean.add(point);
         }
-        mean.div(points.size())
+        mean.div(points.size());
 
         // this section calculates the direction vector of the line of best fit
         PVector direction = new PVector();
@@ -50,7 +52,7 @@ class Line{
         }
 
         this.position = mean;
-        this.direction = direciton;
+        this.direction = direction;
     }
 
     public PVector getSlopeIntForm(){

src/View.java

@@ -4,7 +4,7 @@ import java.util.Objects;
 
 import static processing.core.PApplet.*;
 
-public class View{
+public class View extends PApplet{
     PVector pose;
     float angle = 0;
     float FOV;
@@ -77,7 +77,7 @@ public class View{
     }
 }
 
-class Ray{
+class Ray extends PApplet{
     PVector pose;
     int rayLength;
     int defaultRayLength;

src/Wall.java

@@ -2,7 +2,7 @@ import processing.core.*;
 
 import static processing.core.PApplet.*;
 
-public class Wall{
+public class Wall extends PApplet{
     PVector pos;
     float angle;
     int wallLength;