Originally Posted by merlight
No. new_dx and old_dx are X-distances between two POIs. Map center is not involved in my formula, precisely because the whole map might be shifted, in which case rescaling is not enough.
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Ah, ok. I have misunderstand what were values in formula.
So for Alik'r Desert it will be (3 decimal places, I don't have more for old coordinates):
scale_x = (0.9008 - 0.2224) / (0.957 - 0.178) = 0.871
scale_y = (0.6435 - 0.3484) / (0.665 - 0.326) = 0.871
offset_x = 0.9008 - 0.957 * 0.871 = 0.067
offsey_y = 0.6435 - 0.665 * 0.871 = 0.064
Code:
function translate_old_coords(x, y)
return x * scale_x + offset_x, y * scale_y + offset_y
end
Sandblown Mine:
new_x = 0.877 * 0.871 + 0.067 = 0.831 (expected 0.8312)
new_y = 0.592 * 0.871 + 0.064 = 0.580 (expected 0.5806)
Lost City of the Na-Totambu:
new_x = 0.732 * 0.871 + 0.067 = 0.705 (expected 0.7050)
new_y = 0.373 * 0.871 + 0.064 = 0.389 (expected 0.3890)