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Center viewport on zoom

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DisherProject 2017-08-05 18:52:34 +02:00 • committed by Jyrki Vesterinen
parent a166348f84
commit 29519406be
1 changed files with 5 additions and 2 deletions
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7
src/display.cpp
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@ -1993,8 +1993,11 @@ bool display::set_zoom(unsigned int amount, const bool validate_value_and_set_in
const SDL_Rect& area = map_area();
xpos_ += (xpos_ + area.w / 2) * amount / zoom_;
ypos_ += (ypos_ + area.h / 2) * amount / zoom_;
//Turn the zoom factor to a double in order to avoid rounding errors.
double zoom_factor = double(new_zoom) / double(zoom_);
xpos_ = round_double(((xpos_ + area.w / 2) * zoom_factor) - (area.w / 2));
ypos_ = round_double(((ypos_ + area.h / 2) * zoom_factor) - (area.h / 2));
zoom_ = new_zoom;
bounds_check_position(xpos_, ypos_);