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  Normal 2D coordinates to isometric  (Read 1948 times)
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Offline Porlus

Junior Devvie

« Posted 2012-12-17 20:57:25 »

Hi all,
I'm trying to make a game scene using isometric tiles, with each tile being 32x15 pixels in size. The tiles are organised in a diamond shape with 0,0 at the top, leading down south east for the positive x axis and south west for the positive y axis. The location for each of the entities within the level are stored as normal orthogonal coordinates and what I'm trying to do is render these entities within the scene by converting their position to isometric coordinates.

So for example, the player's character would appear to be walking south-east when they press the right arrow key, as that is the direction of the positive x axis.
Does anyone know how I could convert between normal and isometric coords? I'll just include the rendering procedures so you can see what I currently have. Smiley

This is the render method for the level and as you can see it currently follows the player's normal coordinates:

   public void render(AbstractScreen screen) {
      int dx = (int) (player.x - (Main.WIDTH >> 1));
      int dy = (int) (player.y - (Main.HEIGHT >> 1));
      int plotX, plotY;
      for(int y = 0; y < height; y++) {
         for(int x = 0; x < width; x++) {
            plotX = (x - y) * (Tile.WIDTH >> 1);
            plotY = (x + y) * (Tile.HEIGHT >> 1);
            getTile(x, y).render(screen, plotX - dx, plotY - dy);

There's not much to this but here's the player's render method, which I'm just rendering as a single pixel while testing:

public void render(AbstractScreen screen) {
      int ex = (int) x - (Main.WIDTH >> 1);
      int ey = (int) y - (Main.HEIGHT >> 1);
      screen.setPixel((int) (x - ex), (int) (y - ey), 0xffffffff);


Offline Agro
« Reply #1 - Posted 2012-12-17 23:46:04 »

It depends on how you do it(where 0,0 in isometry begins), but here's my way:

Offline Porlus

Junior Devvie

« Reply #2 - Posted 2012-12-18 00:25:06 »

Hey, thanks for the reply. Yeah I tried that way but the character seems to move slightly off direction. It's moving roughly in the right direction (south-east, south-west, etc) but it's always a bit off and I'm not sure why.
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Offline Porlus

Junior Devvie

« Reply #3 - Posted 2012-12-18 01:43:12 »

I should just point out that this is for entities and not tiles. Smiley
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