super-snuvi/src/me/hammerle/supersnuvi/util/CollisionObject.java

package me.hammerle.supersnuvi.util;

import static me.hammerle.supersnuvi.util.CollisionBox.createScaledTileBox;

public abstract class CollisionObject 
{
    public final static CollisionObject NULL_BOX = new CollisionBox(0.0f, 0.0f, 0.0f, 0.0f);
    public final static CollisionObject DEFAULT_TILE_BOX = createScaledTileBox(0.0f, 0.0f, 1.0f, 1.0f);
    
    public enum Type
    {
        LINE, BOX
    }
    
    public abstract Type getType();
    public abstract CollisionObject copy();
    public abstract void save(); 
    public abstract CollisionObject reset();
    
    public abstract float getWidth();
    public abstract float getHeight();
    
    public abstract float getMinX();
    public abstract float getMaxX();
    public abstract float getMinY();
    public abstract float getMaxY();
   
    public abstract CollisionObject expand(float x, float y);
    
    public final CollisionObject offset(float x, float y)
    {
        offsetX(x);
        offsetY(y);
        return this;
    }
    
    public abstract CollisionObject offsetX(float x);
    public abstract CollisionObject offsetY(float y);
    
    public abstract boolean isColliding(CollisionObject cb);
    
    public final boolean mayCollide(CollisionObject cb)
    {
        // box intersect test, even for lines, prevents failures
        float minX1 = Math.min(cb.getMinX(), cb.getMaxX());
        float minY1 = Math.min(cb.getMinY(), cb.getMaxY());
        float maxX1 = Math.max(cb.getMinX(), cb.getMaxX());
        float maxY1 = Math.max(cb.getMinY(), cb.getMaxY());
        
        float minX2 = Math.min(getMinX(), getMaxX());
        float minY2 = Math.min(getMinY(), getMaxY());
        float maxX2 = Math.max(getMinX(), getMaxX());
        float maxY2 = Math.max(getMinY(), getMaxY());
        
        return maxX1 > minX2 && maxX2 > minX1 && maxY1 > minY2 && maxY2 > minY1;
    }
}