void Map::fitBounds(AnnotationSegment segment, EdgeInsets padding, Duration duration) {
if (segment.empty()) {
return;
}
// Calculate the bounds of the possibly rotated shape with respect to the viewport.
vec2<> nePixel = {-INFINITY, -INFINITY};
vec2<> swPixel = {INFINITY, INFINITY};
for (LatLng latLng : segment) {
vec2<> pixel = pixelForLatLng(latLng);
swPixel.x = std::min(swPixel.x, pixel.x);
nePixel.x = std::max(nePixel.x, pixel.x);
swPixel.y = std::min(swPixel.y, pixel.y);
nePixel.y = std::max(nePixel.y, pixel.y);
}
vec2<> size = nePixel - swPixel;
// Calculate the zoom level.
double scaleX = (getWidth() - padding.left - padding.right) / size.x;
double scaleY = (getHeight() - padding.top - padding.bottom) / size.y;
double minScale = std::fmin(scaleX, scaleY);
double zoom = std::log2(getScale() * minScale);
zoom = std::fmax(std::fmin(zoom, getMaxZoom()), getMinZoom());
// Calculate the center point of a virtual bounds that is extended in all directions by padding.
vec2<> paddedNEPixel = {
nePixel.x + padding.right / minScale,
nePixel.y + padding.top / minScale,
};
vec2<> paddedSWPixel = {
swPixel.x - padding.left / minScale,
swPixel.y - padding.bottom / minScale,
};
vec2<> centerPixel = (paddedNEPixel + paddedSWPixel) * 0.5;
LatLng centerLatLng = latLngForPixel(centerPixel);
setLatLngZoom(centerLatLng, zoom, duration);
}
void TransformState::moveLatLng(const LatLng& latLng, const ScreenCoordinate& anchor) {
auto centerCoord = Projection::project(getLatLng(LatLng::Unwrapped), scale);
auto latLngCoord = Projection::project(latLng, scale);
auto anchorCoord = Projection::project(screenCoordinateToLatLng(anchor), scale);
setLatLngZoom(Projection::unproject(centerCoord + latLngCoord - anchorCoord, scale), getZoom());
}
void TransformState::setLatLngBounds(optional<LatLngBounds> bounds_) {
if (bounds_ != bounds) {
bounds = bounds_;
setLatLngZoom(getLatLng(LatLng::Unwrapped), getZoom());
}
}
