Formulae in summary:
From screen coordinates to tile x,y
map.x = screen.x / TILE_WIDTH + screen.y / TILE_HEIGHT;
map.y = screen.y / TILE_HEIGHT - screen.x / TILE_WIDTH;
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From tile x,y to screen coordinates
screen.x = (map.x - map.y) * TILE_WIDTH_HALF;
screen.y = (map.x + map.y) * TILE_HEIGHT_HALF;
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Note: these only work if the iso map is skewed at 45 degrees. If it's skewed in 30 degrees or 60 degrees, trigonometry will be needed.
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