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    }
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    }
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    // Scales integer point to the range [-1, 1]
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    // Scales integer point to the range [-1, 1]
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    Vec2f QuatTrackBall::scalePoint(const Vec2i& v) const
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    Vec2f QuatTrackBall::scalePoint(const Vec2i& v) const
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    {
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    {
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	Vec2f w(v[0],height - v[1]);
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	Vec2f w(v[0], v[1]);
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	w -= Vec2f(screen_centre);
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	w -= Vec2f(screen_centre);
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	w /= Vec2f(width,height);
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	w /= Vec2f(width,height);
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	w = CGLA::v_min(Vec2f(1.0f), CGLA::v_max(Vec2f(-1), 2*w));
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	w = CGLA::v_min(Vec2f(1.0f), CGLA::v_max(Vec2f(-1), 2*w));
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	return w;
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	return w;
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    }
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    }