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

package me.hammerle.supersnuvi.util;

import me.hammerle.supersnuvi.tiles.Tile;

public class Utils 
{
    public static float interpolate(float from, float to, float factor)
    {
        return from + (to - from) * factor;
    }
    
    public static int toBlock(float c)
    {
        return (int) (c / Tile.SIZE);
    }

    public static float toCoord(int b)
    {
        return b * Tile.SIZE;
    }
    
    public static float getSquaredDistance(float x1, float y1, float x2, float y2)
    {
        return (x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2);
    }
    
    public static Face getCollidingFace(
            float xMin1, float yMin1, float xMax1, float yMax1, 
            float xMin2, float yMin2, float xMax2, float yMax2)
    {
        float diffUp = yMax1 - yMin2;
        float diffRight = xMax2 - xMin1;
        float diffDown = yMax2 - yMin1;
        float diffLeft = xMax1 - xMin2;
        
        float min = diffUp;
        
        Face f = Face.UP;
        if(min > diffRight)
        {
            min = diffRight;
            f = Face.RIGHT;
        }
        if(min > diffDown)
        {
            min = diffDown;
            f = Face.DOWN;
        }
        if(min > diffLeft)
        {
            f = Face.LEFT;
        }
        
        int c = 0;
        c += (min == diffUp) ? 1 : 0;
        c += (min == diffRight) ? 1 : 0;
        c += (min == diffDown) ? 1 : 0;
        c += (min == diffLeft) ? 1 : 0;
        if(c >= 2)
        {
            return Face.NULL;
        }
        
        return f;
    }
}