CameraOptions Map::cameraForLatLngs(const std::vector<LatLng>& latLngs, const EdgeInsets& padding) {
CameraOptions options;
if (latLngs.empty()) {
return options;
}
// Calculate the bounds of the possibly rotated shape with respect to the viewport.
PrecisionPoint nePixel = {-INFINITY, -INFINITY};
PrecisionPoint swPixel = {INFINITY, INFINITY};
for (LatLng latLng : latLngs) {
PrecisionPoint 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);
}
double width = nePixel.x - swPixel.x;
double height = nePixel.y - swPixel.y;
// Calculate the zoom level.
double scaleX = (getWidth() - padding.left - padding.right) / width;
double scaleY = (getHeight() - padding.top - padding.bottom) / height;
double minScale = ::fmin(scaleX, scaleY);
double zoom = ::log2(getScale() * minScale);
zoom = ::fmax(::fmin(zoom, getMaxZoom()), getMinZoom());
// Calculate the center point of a virtual bounds that is extended in all directions by padding.
PrecisionPoint paddedNEPixel = {
nePixel.x + padding.right / minScale,
nePixel.y + padding.top / minScale,
};
PrecisionPoint paddedSWPixel = {
swPixel.x - padding.left / minScale,
swPixel.y - padding.bottom / minScale,
};
PrecisionPoint centerPixel = {
(paddedNEPixel.x + paddedSWPixel.x) / 2,
(paddedNEPixel.y + paddedSWPixel.y) / 2,
};
options.center = latLngForPixel(centerPixel);
options.zoom = zoom;
return options;
}
CameraOptions Map::cameraForLatLngs(std::vector<LatLng> latLngs, EdgeInsets padding) {
CameraOptions options;
if (latLngs.empty()) {
return options;
}
// Calculate the bounds of the possibly rotated shape with respect to the viewport.
vec2<> nePixel = {-INFINITY, -INFINITY};
vec2<> swPixel = {INFINITY, INFINITY};
for (LatLng latLng : latLngs) {
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 = ::fmin(scaleX, scaleY);
double zoom = ::log2(getScale() * minScale);
zoom = ::fmax(::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);
options.center = centerLatLng;
options.zoom = zoom;
return options;
}
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);
}
