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Java for Game Design - Highly Terrible Idea...
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Jorg hi
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PostPosted: Wed Sep 01, 2010 4:53 pm    Post subject: Java for Game Design - Highly Terrible Idea... Reply with quote
Please don't move this thread, the Game Design section is dead.


I've started using Java for creating a game, but you usually need 20+ lines of code just to do a simple thing you can do in C# with less than 5. Because of this, I had to put so much effort just to get the engine of the game work. Also Java hasn't updated their Sound API to support mp3 yet???

Also how am I going to load an image and get good collision testing?

Example: I load an image that looks like this into java.


How do I make it so the collision bounds touches the blue and not the entire image the collision? Should I use getPixel before I get collision to make sure its not white? And before drawing it to the screen I should replace it to white(The Background Color?)


edit: Idea!

Code:
public void RegisterPoint(int x, int y){ //Once Registered, the only way to edit a point is to reset all of them.
    sprite_collision_points[pnt_num] = new Point(x,y);
    pnt_num+=1;
}

public void ResetAllPointData(){
    for (int i = 0;i< Integer.MAX_VALUE;i++)
    {
    if (sprite_collision_points[i] != null){sprite_collision_points[i] = null;}
    if (sprite_collision_points[i] == null){i=Integer.MAX_VALUE;}
    }
}

public Boolean CheckCollision(int x1, int x2){
    for (int i = 0;i< Integer.MAX_VALUE;i++)
    {
    if (sprite_collision_points[i].equals(new Point(x1,x2))){i=Integer.MAX_VALUE;return true;}
    if (sprite_collision_points[i] == null){i=Integer.MAX_VALUE;return false;}
    }
    return false;
}


I bet my Collision system is the most accurate out of all java games.
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XaLeX
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PostPosted: Wed Sep 01, 2010 7:47 pm    Post subject: Reply with quote
Don't be offended, but it looks physical memory AND cpu intensive.
Also, those "i = Integer.MAX_VALUE" are horrible... why don't you use break? (btw the ones before a return are useless because you return from the function anyway.
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Jorg hi
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PostPosted: Wed Sep 01, 2010 8:58 pm    Post subject: Reply with quote
yeye I just made something in a couple of secs. i'll post later
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Jorg hi
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PostPosted: Thu Sep 02, 2010 11:53 am    Post subject: Reply with quote
Fixed:

Code:
public void RegisterPoint(int x, int y){ //Once Registered, the only way to edit a point is to reset all of them.
    sprite_collision_points[x][y] = true;
    pnt_num+=1;
}

public void ResetAllPointData(){
    for (int i = 0, z = 0;i< 5000;i++, z++)
    {
    if (sprite_collision_points[i][z] == true){sprite_collision_points[i][z] = false;}
    if (sprite_collision_points[i][z] == null){i=Integer.MAX_VALUE;}
    }
}

public Boolean CheckCollision(int x1, int y1){
    if (sprite_collision_points[x1][y1] == true){return true;}
    if (sprite_collision_points[x1][y1] == false){return false;}
    if (sprite_collision_points[x1][y1] == null){return false;}
    return false;
}

public Boolean CheckCollisionBox(int x1, int y1,int x2, int y2){
    for (int i = x1;i < x2; i++)
    {
    for (int z = y1;i < y2; z++)
    {
    if (sprite_collision_points[i][z] == true){return true;}
    if (sprite_collision_points[i][z] == null){return false;}
    }
    }
    return false;
}

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hcavolsdsadgadsg
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PostPosted: Thu Sep 02, 2010 4:23 pm    Post subject: Reply with quote
i haven't worked with collision but a bitwise and sounds like a good idea.


you can generate your collision mask from an image and use 1 bit for each pixel. if it's 1, it has collision, if it's 0, it doesn't.

then just do a bitwise and on a chunk of data and if any bits in the return at 1, then you have a collision and can stop the test. if you use SSE, you can effectively check 128 pixels in a single shot.
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XaLeX
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PostPosted: Thu Sep 02, 2010 5:28 pm    Post subject: Reply with quote
i'm not a java expert but i hope you'll accept these suggestions:



Quote:
Code:
public void ResetAllPointData(){
    for (int i = 0, z = 0;i< 5000;i++, z++)
    {
    if (sprite_collision_points[i][z] == true){sprite_collision_points[i][z] = false;}
    if (sprite_collision_points[i][z] == null){i=Integer.MAX_VALUE;}
    }
}
- The for will not cycle through the whole array, but only in the NorthWest - SouthEast diagonal.
- Some minor fixes can be made, and maybe you could consider deleting the whole array and allocating a new one if it's faster. Resetting a 1280x800 array takes a little more than one million cycles.
- It's better to avoid using numbers like that 5000. Define constants instead.
- If the array is of Boolean values, how can a value be null? Uninitialized?
Code:
public void ResetAllPointData() {
    for(int i = 0; i < SCREEN_WIDTH; i++) {
        for(int j = 0; j < SCREEN_HEIGHT; j++) {
            sprite_collision_points[i][j] = false;
        }
    }
}

-----
Quote:
Code:
public Boolean CheckCollision(int x1, int y1){
    if (sprite_collision_points[x1][y1] == true){return true;}
    if (sprite_collision_points[x1][y1] == false){return false;}
    if (sprite_collision_points[x1][y1] == null){return false;}
    return false;
}
Too many if's!
Code:
public Boolean CheckCollision(int x, int y) {
    return sprite_collision_points[x][y];
}

-----
Quote:
Code:
public Boolean CheckCollisionBox(int x1, int y1,int x2, int y2){
    for (int i = x1;i < x2; i++)
    {
    for (int z = y1;i < y2; z++)
    {
    if (sprite_collision_points[i][z] == true){return true;}
    if (sprite_collision_points[i][z] == null){return false;}
    }
    }
    return false;
}
My suggestion:
Code:
public Boolean CheckCollisionBox(int x1, int y1,int x2, int y2){
    for (int i = x1;i < x2; i++) {//depending on implementation, you may want "i <= x2" instead of "i < x2". Same goes for the other for.
        for (int z = y1; z < y2; z++) {//here it's "z < y2", not "i < y2"
            if (sprite_collision_points[i][z]){return true;}
        }
    }
    return false;
}
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hcavolsdsadgadsg
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PostPosted: Thu Sep 02, 2010 7:18 pm    Post subject: Reply with quote
you should be avoiding doing work on the entire screen anyway if speed is a problem.

look at quad trees
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Jorg hi
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PostPosted: Thu Sep 02, 2010 7:32 pm    Post subject: Reply with quote
Wow XaLeX, you really fixed my entire program. But I still need to find how this java thing works.

@slovach - I created my own function already to do this.
I'm using simple graphics so it will work nicely.

Code:
public Boolean[][] getPoints(String imgloc, int maxX, int MaxY, Color SpecificColor, String name) throws IOException{
   BufferedImage image = new BufferedImage(555,555, BufferedImage.TYPE_INT_RGB);
   Image imagex = new ImageIcon(imgloc).getImage();
   image.getGraphics().drawImage(imagex, 0, 0, null);

   for (int i = 0;i<image.getWidth();i++)
   {
   for (int z = 0;z<image.getHeight();z++)
   {
   int color = image.getRGB(i,z);
   if (color == SpecificColor.getRGB() && i <= maxX && z <= MaxY){
   sprite_collision_points[i][z] = true;

   //System.out.print(i + "," + z);
   } else {sprite_collision_points[i][z] = false;}
   }
   }
   return writeData(sprite_collision_points,image.getWidth(),image.getHeight(), name);
}

public Boolean[][] writeData(Boolean[][] data, int width, int height, String name){ //Compacts data to about .3% of its actual size
    try {
     FileWriter outFile = new FileWriter("C:/Users/Christina/Desktop/" + name + ".txt");
     PrintWriter out = new PrintWriter(outFile);
     int start = -1;
     int start_false = -1;
        for (int i = 0;i< width;i++){
        for (int z = 0;z< height;z++){
            if (sprite_collision_points[i][z] == true && start == -1)
            {
              start = z;
              //out.println("[" + i + "," + z + "]=true");
            }
            if (sprite_collision_points[i][z] == false && start_false == -1)
            {
              start_false = z;
              //out.println("[" + i + "," + z + "]=true");
            }

            if (sprite_collision_points[i][z] == false && start != -1) {out.println("[" + i + "," + (start-1) + " to " + (z-1) + "]=true");start=-1;start_false=-1;}
            if (sprite_collision_points[i][z] == true && start_false != -1) {out.println("[" + i + "," + start_false + " to " + (z-1) + "]=false");start=-1;start_false=-1;}}

        start=-1;start_false=-1;
        }

              out.close();
              return sprite_collision_points;
          } catch (Exception e){
              System.out.println("ERROR");
              e.printStackTrace();
          }

             return null;
}



Example on an image Output:
Code:
[24,0 to 14]=false
[24,15 to 289]=true
[24,291 to 310]=false
[25,0 to 14]=false
[25,15 to 289]=true
[25,291 to 310]=false
[26,0 to 14]=false
[26,15 to 289]=true
[26,291 to 310]=false
[27,0 to 14]=false
[27,15 to 289]=true
[27,291 to 310]=false
[28,0 to 14]=false
[28,15 to 289]=true
[28,291 to 310]=false
[29,0 to 14]=false
[29,15 to 289]=true
[29,291 to 310]=false
[30,0 to 14]=false
[30,15 to 289]=true
[30,291 to 310]=false
[31,0 to 14]=false
[31,15 to 289]=true
[31,291 to 310]=false
[32,0 to 14]=false
[32,15 to 289]=true
[32,291 to 310]=false
[33,0 to 14]=false
[33,15 to 289]=true
[33,291 to 310]=false
[34,0 to 14]=false
[34,15 to 289]=true
[34,291 to 310]=false
[35,0 to 14]=false
[35,15 to 289]=true
.............................

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Jorg hi
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PostPosted: Fri Sep 03, 2010 4:17 pm    Post subject: Reply with quote
That above method was only used to store the data for the sprite collision because Java Can't write bits and I don't want to waste time using a library.

So I made a new idea.

1.Store the collision data in a BitSet[]
2.Whenever the players bounds collide with an objects bounds it will perform the collision test to see if it is an actual collision.

Code:
public BitSet[] getPoints(String imgloc, int maxX, int MaxY, Color SpecificColor, String name) {
   BufferedImage image = new BufferedImage(555,555, BufferedImage.TYPE_INT_RGB);
   Image imagex = new ImageIcon(imgloc).getImage();
   image.getGraphics().drawImage(imagex, 0, 0, null);
   BitSet[] bits1 = new BitSet[image.getWidth()]; //Creates the new collision array
   
   for (int i = 0;i<image.getWidth();i++)
   {
   bits1[i] = new BitSet(image.getHeight());
   for (int z = 0;z<image.getHeight();z++)
   {
   int color = image.getRGB(i,z);
   if (color == SpecificColor.getRGB() && i <= maxX && z <= MaxY){
   bits1[i].set(z);
   }
   }
   }
   return bits1;
}


Seems nice? Very Happy

Edit:
Implementation I used.

Gets the points as a BitSet
Code:
    Sprite x3 = new Sprite();
    x3.LoadPoints(new creator_getspritepoints().getPoints("C:/Users/Christina/Desktop/TestingImage.gif", 5555, 5555, Color.black,"test1"));
    System.out.print(x3.CheckCollision(0, 0));

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TROLOLOLOLOLOLOLOLOLOLOLO
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PostPosted: Fri Sep 03, 2010 10:28 pm    Post subject: Reply with quote
Well C# would only run on Windows/Xbox, Java can pretty much run on any OS whereas C# can't. Also, you can always make an online game too, if you don't want a downloadable one. RuneScape seems to be doing fine.
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Jorg hi
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PostPosted: Sat Sep 04, 2010 9:35 am    Post subject: Reply with quote
Its just that Java librarys have just too little capability...
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PostPosted: Sat Sep 04, 2010 10:04 am    Post subject: Re: Java for Game Design - Highly Terrible Idea... Reply with quote
Jorghi wrote:
Please don't move this thread, the Game Design section is dead.


I've started using Java for creating a game, but you usually need 20+ lines of code just to do a simple thing you can do in C# with less than 5. Because of this, I had to put so much effort just to get the engine of the game work. Also Java hasn't updated their Sound API to support mp3 yet???

Also how am I going to load an image and get good collision testing?

Example: I load an image that looks like this into java.


How do I make it so the collision bounds touches the blue and not the entire image the collision? Should I use getPixel before I get collision to make sure its not white? And before drawing it to the screen I should replace it to white(The Background Color?)


edit: Idea!

Code:
public void RegisterPoint(int x, int y){ //Once Registered, the only way to edit a point is to reset all of them.
    sprite_collision_points[pnt_num] = new Point(x,y);
    pnt_num+=1;
}

public void ResetAllPointData(){
    for (int i = 0;i< Integer.MAX_VALUE;i++)
    {
    if (sprite_collision_points[i] != null){sprite_collision_points[i] = null;}
    if (sprite_collision_points[i] == null){i=Integer.MAX_VALUE;}
    }
}

public Boolean CheckCollision(int x1, int x2){
    for (int i = 0;i< Integer.MAX_VALUE;i++)
    {
    if (sprite_collision_points[i].equals(new Point(x1,x2))){i=Integer.MAX_VALUE;return true;}
    if (sprite_collision_points[i] == null){i=Integer.MAX_VALUE;return false;}
    }
    return false;
}


I bet my Collision system is the most accurate out of all java games.




Runescape Private Server.
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Jorg hi
I post too much
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PostPosted: Sat Sep 04, 2010 11:30 am    Post subject: Reply with quote
^ Your post is really useless..

And I'm done.
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XaLeX
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PostPosted: Sat Sep 04, 2010 12:15 pm    Post subject: Reply with quote
Jorghi wrote:
Its just that Java librarys have just too little capability...
it's what you have to give up for portability Razz
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PostPosted: Sat Sep 04, 2010 5:05 pm    Post subject: Reply with quote
CometJack wrote:
Well C# would only run on Windows/Xbox, Java can pretty much run on any OS whereas C# can't. Also, you can always make an online game too, if you don't want a downloadable one. RuneScape seems to be doing fine.


mono
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