001 package examples.multiview;
002
003 import java.awt.geom.Point2D;
004
005 import fang.*;
006
007
008 /**Demonstrates scrolling by moving the
009 * mouse in the direction desired from
010 * the center of the screen. This example
011 * extends on the Navigator example by
012 * adding extra players, each with their
013 * own view.
014 * @author Jam Jenkins*/
015 public class MultiView extends GameLoop
016 {
017 /** tiles image reflected vertically and
018 * horizontally to make it seamless.*/
019 private ImageSprite background;
020
021 /** the players*/
022 private StringSprite[] playerSprites;
023
024 /** the trackers for the players*/
025 private ProjectileTracker[] playerTrackers;
026
027 /**the tracker used for the scrolling*/
028 private ScrollTracker tracker;
029
030 /** makes and adds the sprites */
031 public void startGame()
032 {
033 makeSprites();
034 addSprites();
035 setHelp("resources/MultiViewHelp.txt");
036 }
037
038 /** makes the image sprites for the background
039 * and sets a scrolling tracker on it. Also
040 * sets each player's sprite to have a
041 * ProjectileTracker on it.*/
042 private void makeSprites()
043 {
044 playerSprites=new StringSprite[getNumberOfPlayers()];
045 playerTrackers=new ProjectileTracker[getNumberOfPlayers()];
046 for(int i=0; i<playerSprites.length; i++)
047 {
048 playerSprites[i]=new StringSprite(getPlayer(i).getName());
049 playerSprites[i].setWidth(0.25);
050 playerSprites[i].setLocation(0.5, 0.5);
051 playerTrackers[i]=new ProjectileTracker(new Point2D.Double());
052 playerSprites[i].setTracker(playerTrackers[i]);
053 }
054
055 background=new ImageSprite("resources/road.jpg");
056 background.setScale(1);
057 tracker=new ScrollTracker(
058 true,
059 new Point2D.Double(),
060 background,
061 3);
062 background.setTracker(tracker);
063 }
064
065 /**adds the sprites to the canvas*/
066 private void addSprites()
067 {
068 canvas.addSprite(background);
069 for(StringSprite sprite: playerSprites)
070 canvas.addSprite(sprite);
071 }
072
073 /**
074 * gets the velocity to move the player at.
075 * The player only moves on mouse click. If
076 * you want the player to move like in the
077 * Navigator example, change the first line
078 * to just get the mouse location instead of
079 * the mouse click location.
080 * @param index the index of the player's mouse
081 * @return a velocity equivalent to the vector
082 * from the mouse position to the center of the
083 * screen.
084 */
085 private Point2D.Double getVelocity(int index)
086 {
087 Point2D.Double mouse=getPlayer(index).getMouse().getClickLocation();
088 if(mouse==null) return new Point2D.Double();
089 Point2D.Double center=new Point2D.Double(0.5, 0.5);
090 double distance=mouse.distance(center);
091 double maxDistance=center.distance(1, 1);
092 Point2D.Double v;
093 /**only move if more than 10% the distance from
094 * the center to the corner*/
095 if(distance/maxDistance>0.1)
096 {
097 v=new Point2D.Double(
098 center.x-mouse.x,
099 center.y-mouse.y);
100 }
101 else
102 v=new Point2D.Double();
103 return v;
104 }
105
106 /**uses the position of the mouse in relation
107 * to the center of the screen to move the
108 * background in the direction and speed
109 * indicated. The angle from the center to the
110 * mouse if the direction the background moves
111 * and as the distance from the center of the
112 * screen increases, so too does the scroll speed*/
113 public void advanceFrame(double timeAdvanced)
114 {
115 Point2D.Double v=getVelocity(getID());
116 for(int i=0; i<playerTrackers.length; i++)
117 {
118 Point2D.Double velocity=getVelocity(i);
119 if(i!=getID())
120 {
121 //other players movements are affected not only
122 //by their own mouse, but also by the scrolling
123 //of this player
124 playerTrackers[i].setVelocity(new Point2D.Double(
125 v.x-velocity.x, v.y-velocity.y));
126 }
127 else
128 {
129 //this player never moves. Instead, the other
130 //players and background scroll by.
131 tracker.setVelocity(new Point2D.Double(
132 velocity.x, velocity.y));
133 }
134 }
135
136 }
137
138 /**
139 * sets up the game for 2 or more players
140 * @param argv not used.
141 */
142 public static void main(String[] argv)
143 {
144 MultiView multiView=new MultiView();
145 multiView.playersSelectable=true;
146 multiView.players=2;
147 multiView.runAsApplication();
148 }
149 }
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