Isometric tiles drawing and picking - JAVA

Question

I'm trying to draw isometric tiles in Java and implement a tile picking system using the mouse cursor. I draw the tiles using math formulas I found and adapted to my tile textures which you can find below. Tiles are 64x64px but flat tiles are only 32px height even if I draw them using the 64x64 sprite.

public int[] toIso(int x, int y){

    int i = (x - y) * tileWidthHalf;
    int j = (x + y) * tileHeightQuarter;

    i+=xOffset;
    j+=yOffset;

    return new int[]{i,j};
}

public int[] toGrid(int x, int y){

    x-=xOffset;
    y-=yOffset;

    int i = (x/tileWidthHalf + y/tileHeightQuarter)/2;
    int j = (y/tileHeightQuarter - x/tileWidthHalf)/2;

    return new int[]{i,j};
}

The map is a simple 2d array where my tiles are represented by their id.

Here is a video showing what is actually happening: youtu.be/baCVIfJz2Wo

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Answer 1

just wanted to say that I finally solved it. It was just a conversion to int issue. These are the final methods that I use. Hope it will help people who were trying to work with isometric tiles. Thank you !

public static int[] toIso(int x, int y){

    int i = (x - y) * TILE_WIDTH_HALF;
    int j = (x + y) * TILE_HEIGHT_QUARTER;

    i += xOffset-TILE_WIDTH_HALF;
    j+=yOffset;

    return new int[]{i,j};
}

public static int[] toGrid(double i, double j){

    i-=xOffset;
    j-=yOffset;

    double tx = Math.ceil(((i / TILE_WIDTH_HALF) + (j / TILE_HEIGHT_QUARTER))/2);
    double ty = Math.ceil(((j / TILE_HEIGHT_QUARTER) - (i / TILE_WIDTH_HALF))/2);

    int x = (int) Math.ceil(tx)-1;
    int y = (int) Math.ceil(ty)-1;

    return new int[]{x, y};
}