Changeset 9ef6f68 in galcon-client for src/com/example/helloandroid/Fleet.java

Timestamp:

Jun 1, 2010, 2:12:31 AM (14 years ago)

Author:

Zero Cool <devnull@…>

Branches:

master

Children:

61c4fbc

Parents:

c27abf4

Message:

Chugging along with path finding

File:

• src/com/example/helloandroid/Fleet.java (modified) (6 diffs)

src/com/example/helloandroid/Fleet.java

@@ -1 +1 @@
 package com.example.helloandroid;
+
+import java.util.ArrayList;
 
 public class Fleet {
@@ -11 +13 @@
         private int numShips;
         private int faction;
+        private boolean isNextToAPlanet;
         
         /* Optimising: pre-calculate paths */
@@ -17 +20 @@
                 if((destination.getX() - source.getX()) != 0){
                 //line formula 
-                slope = ((source.getY() - destination.getY())/(source.getX() - destination.getX()));
+                slope = getSlope(source.getX(),source.getY(),destination.getX(),destination.getY());
                 xIntercept = destination.getY() - (slope*destination.getX());
                 
                 //direction
-                direction = 1/Math.tan(slope);
+                direction = Math.atan(slope);
                 
                 //coordinates for all 4 coordinates
@@ -48 +51 @@
                 this.faction = faction;
                 this.destination = destination;
+                this.isNextToAPlanet = false;
         }
         
@@ -123 +127 @@
 
 
-        public void update() {
+        public void update(ArrayList<Planet> planets) {
                 int speed = 1; //pixels per move
+                double distance, tangentDirection, angle;
+                Planet temp = null;
+                //is the ship going around a planet already
+                if(!isNextToAPlanet){
+                        /*looks through all the planets to figure out if
+                        the ship's path is about to intersect a planet*/
+                        for(Planet p: planets){
+                                //if two point of intersection are found save planet 
+                                distance = getDistanceBetween(dblX,dblY,p.getX(),p.getY());
+                                if(distance <= p.radius){
+                                        temp = p;
+                                        break;
+                                }
+                        }
+                        //if temp planet is not picked move along the direction by #speed
+                        if(temp == null){
+                                dblY += (Math.sin(direction)*speed);
+                                dblX += (Math.cos(direction)*speed);
+                                
+                                x = (int)dblX;
+                                y = (int)dblY;
+                        } else 
+                        //otherwise
+                        {
+                                //figure out which way to go clockwise or counter clockwise 
+                                tangentDirection = (Math.atan(getSlope(temp.getX(),temp.getY(),dblX,dblY))) + (Math.PI/2);
+                                angle = Math.atan((Math.tan(tangentDirection) - Math.tan(direction))/(1 + Math.tan(tangentDirection)*Math.tan(direction)));
+                                if (angle <= Math.PI/2)
+                                        angle = Math.PI - angle;
+                                //get next point and the direction and set it
+                        }
+                } else {
+                        //can you reach the center of the planet by following this direction
+                        //if so set isNextToAPlanet to false and move 
+                        //otherwise continue moving along the circumferenceds4
+                
+                }
+                
+                
         }
         
@@ -137 +180 @@
                 }
         }
+        
+        //helper functions
+        private double getDistanceBetween(double x1, double y1, double x2, double y2)
+        {
+                return Math.sqrt(Math.pow((x2 - x1),2) + Math.pow((y2 - y1),2));
+        }
+        
+        private double getSlope(double x1, double y1, double x2, double y2)
+        {
+                return ((y1 - y1)/(x2 - x1));
+        }
 }