Java Slick2d图像/纹理.equals（）

Question

I am creating a 2d tile game. In this game, borders between different types of tiles are drawn in the program (corner tiles, side tiles, etc.) There is a finite number of possible tiles like this. As soon as I implemented this however, the frame rate crashed pretty badly. I figured out that the act of redrawing the 80-90 visible tiles every frame was the problem. I tried to implement a cache system to cache the unique tiles. This system works except for the fact that I cannot compare a generated image to a cache of images.

Here is what I would like to be able to do:

//tile object is an Image
if (cache.contains(tile)){
    return cache;
} else {
    cache.add(tile);
    return tile;
}

The problem lies with the comparison of two Slick2D Image objects. It seems like the image.equals() method will only be true if both the image pointers represent the same object. Other than pixel by pixel comparison, is there a way to quickly see if two different Image objects have exactly the same data?

Answer 1

In the past how I have used tile systems is by using the TiledMap classes and then redrawing what the world tiles would look like in the Tiled Editor ( http://www.mapeditor.org ). This creates a .tmx file which can be used for collisions and rendering.

However, if you are looking for procedural generation my best recommendation would be to create a 'Tile' class. For example:

public class Tile {
    public static int CORNER_TILE = 0;
    public static int SIDE_TILE = 1;
    public static int CENTRE_TILE = 2;

    public int x, y, type;

    public Tile(int type, int x, int y) {
        this.type = type;
        this.x = x;
        this.y = y;
    } 
    public void render(Graphics g) {
        //Insert rendering code for each different tile type
        //For example:

        if (this.type == Tile.CENTRE_TILE) {
            g.drawImage(Main.someTileImage, x * 32, y * 32);
            //Multiply x and y by dimensions of tile
        }
   }
}

All you would then need is a 2d array of tiles which you loop through to update each frame. I know this isn't exactly what you asked but these are my ways of working with tiles. Hope this helps :)