b5bb48edaa
Simplify LatLng::{wrap,unwrapForShortestPath} code, avoiding duplicated
code between Transform::{latLngToScreenCoordinate,easeTo,flyTo}.
Added unit tests for camera usage in Transform to detect cases like e.g.
crossing the antimeridian as a shortest path between two coordinates.
Transform::flyTo precision loss to be handled in #4298.
661 lines
22 KiB
C++
661 lines
22 KiB
C++
#include <mbgl/map/camera.hpp>
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#include <mbgl/map/transform.hpp>
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#include <mbgl/map/view.hpp>
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#include <mbgl/util/constants.hpp>
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#include <mbgl/util/mat4.hpp>
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#include <mbgl/util/math.hpp>
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#include <mbgl/util/unitbezier.hpp>
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#include <mbgl/util/interpolate.hpp>
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#include <mbgl/platform/log.hpp>
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#include <mbgl/platform/platform.hpp>
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#include <mbgl/util/chrono.hpp>
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#include <cstdio>
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#include <cmath>
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using namespace mbgl;
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/** Converts the given angle (in radians) to be numerically close to the anchor angle, allowing it to be interpolated properly without sudden jumps. */
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static double _normalizeAngle(double angle, double anchorAngle)
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{
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if (std::isnan(angle) || std::isnan(anchorAngle)) {
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return 0;
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}
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angle = util::wrap(angle, -M_PI, M_PI);
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if (angle == -M_PI) angle = M_PI;
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double diff = std::abs(angle - anchorAngle);
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if (std::abs(angle - util::M2PI - anchorAngle) < diff) {
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angle -= util::M2PI;
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}
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if (std::abs(angle + util::M2PI - anchorAngle) < diff) {
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angle += util::M2PI;
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}
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return angle;
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}
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Transform::Transform(View &view_, ConstrainMode constrainMode)
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: view(view_)
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, state(constrainMode)
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{
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}
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#pragma mark - Map View
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bool Transform::resize(const std::array<uint16_t, 2> size) {
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if (state.width != size[0] || state.height != size[1]) {
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view.notifyMapChange(MapChangeRegionWillChange);
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state.width = size[0];
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state.height = size[1];
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state.constrain(state.scale, state.x, state.y);
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view.notifyMapChange(MapChangeRegionDidChange);
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return true;
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} else {
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return false;
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}
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}
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#pragma mark - Camera
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/**
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* Change any combination of center, zoom, bearing, and pitch, without
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* a transition. The map will retain the current values for any options
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* not included in `options`.
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*/
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void Transform::jumpTo(const CameraOptions& camera) {
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easeTo(camera);
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}
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/**
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* Change any combination of center, zoom, bearing, and pitch, with a smooth animation
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* between old and new values. The map will retain the current values for any options
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* not included in `options`.
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*/
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void Transform::easeTo(const CameraOptions& camera, const AnimationOptions& animation) {
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const LatLng latLng = camera.center.value_or(getLatLng()).wrapped();
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double zoom = camera.zoom.value_or(getZoom());
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double angle = camera.angle.value_or(getAngle());
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double pitch = camera.pitch.value_or(getPitch());
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if (!latLng || std::isnan(zoom)) {
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return;
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}
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// Determine endpoints.
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EdgeInsets padding;
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if (camera.padding) padding = *camera.padding;
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LatLng startLatLng = getLatLng(padding).wrapped();
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startLatLng.unwrapForShortestPath(latLng);
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const ScreenCoordinate startPoint = {
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state.lngX(startLatLng.longitude),
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state.latY(startLatLng.latitude),
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};
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const ScreenCoordinate endPoint = {
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state.lngX(latLng.longitude),
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state.latY(latLng.latitude),
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};
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ScreenCoordinate center = getScreenCoordinate(padding);
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center.y = state.height - center.y;
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// Constrain camera options.
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zoom = util::clamp(zoom, state.getMinZoom(), state.getMaxZoom());
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const double scale = state.zoomScale(zoom);
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pitch = util::clamp(pitch, 0., util::PITCH_MAX);
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Update update = state.getZoom() == zoom ? Update::Repaint : Update::Zoom;
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// Minimize rotation by taking the shorter path around the circle.
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angle = _normalizeAngle(angle, state.angle);
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state.angle = _normalizeAngle(state.angle, angle);
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Duration duration = animation.duration ? *animation.duration : Duration::zero();
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const double startWorldSize = state.worldSize();
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state.Bc = startWorldSize / util::DEGREES_MAX;
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state.Cc = startWorldSize / util::M2PI;
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const double startScale = state.scale;
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const double startAngle = state.angle;
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const double startPitch = state.pitch;
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state.panning = latLng != startLatLng;
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state.scaling = scale != startScale;
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state.rotating = angle != startAngle;
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startTransition(camera, animation, [=](double t) {
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ScreenCoordinate framePoint = util::interpolate(startPoint, endPoint, t);
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LatLng frameLatLng = {
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state.yLat(framePoint.y, startWorldSize),
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state.xLng(framePoint.x, startWorldSize)
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};
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double frameScale = util::interpolate(startScale, scale, t);
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state.setLatLngZoom(frameLatLng, state.scaleZoom(frameScale));
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if (angle != startAngle) {
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state.angle = util::wrap(util::interpolate(startAngle, angle, t), -M_PI, M_PI);
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}
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if (pitch != startPitch) {
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state.pitch = util::interpolate(startPitch, pitch, t);
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}
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if (padding) {
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state.moveLatLng(frameLatLng, center);
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}
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return update;
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}, duration);
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}
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/** This method implements an “optimal path” animation, as detailed in:
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Van Wijk, Jarke J.; Nuij, Wim A. A. “Smooth and efficient zooming and
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panning.” INFOVIS ’03. pp. 15–22.
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<https://www.win.tue.nl/~vanwijk/zoompan.pdf#page=5>.
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Where applicable, local variable documentation begins with the associated
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variable or function in van Wijk (2003). */
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void Transform::flyTo(const CameraOptions &camera, const AnimationOptions &animation) {
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const LatLng latLng = camera.center.value_or(getLatLng()).wrapped();
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double zoom = camera.zoom.value_or(getZoom());
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double angle = camera.angle.value_or(getAngle());
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double pitch = camera.pitch.value_or(getPitch());
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if (!latLng || std::isnan(zoom)) {
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return;
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}
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// Determine endpoints.
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EdgeInsets padding;
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if (camera.padding) padding = *camera.padding;
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LatLng startLatLng = getLatLng(padding).wrapped();
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startLatLng.unwrapForShortestPath(latLng);
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const ScreenCoordinate startPoint = {
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state.lngX(startLatLng.longitude),
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state.latY(startLatLng.latitude),
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};
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const ScreenCoordinate endPoint = {
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state.lngX(latLng.longitude),
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state.latY(latLng.latitude),
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};
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ScreenCoordinate center = getScreenCoordinate(padding);
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center.y = state.height - center.y;
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// Constrain camera options.
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zoom = util::clamp(zoom, state.getMinZoom(), state.getMaxZoom());
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pitch = util::clamp(pitch, 0., util::PITCH_MAX);
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// Minimize rotation by taking the shorter path around the circle.
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angle = _normalizeAngle(angle, state.angle);
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state.angle = _normalizeAngle(state.angle, angle);
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const double startZoom = state.scaleZoom(state.scale);
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const double startAngle = state.angle;
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const double startPitch = state.pitch;
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/// w₀: Initial visible span, measured in pixels at the initial scale.
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/// Known henceforth as a <i>screenful</i>.
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double w0 = padding ? std::max(state.width, state.height)
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: std::max(state.width - padding.left - padding.right,
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state.height - padding.top - padding.bottom);
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/// w₁: Final visible span, measured in pixels with respect to the initial
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/// scale.
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double w1 = w0 / state.zoomScale(zoom - startZoom);
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/// Length of the flight path as projected onto the ground plane, measured
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/// in pixels from the world image origin at the initial scale.
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double u1 = ::hypot((endPoint - startPoint).x, (endPoint - startPoint).y);
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/** ρ: The relative amount of zooming that takes place along the flight
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path. A high value maximizes zooming for an exaggerated animation, while
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a low value minimizes zooming for something closer to easeTo().
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1.42 is the average value selected by participants in the user study in
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van Wijk (2003). A value of 6<sup>¼</sup> would be equivalent to the
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root mean squared average velocity, V<sub>RMS</sub>. A value of 1 would
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produce a circular motion. */
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double rho = 1.42;
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if (animation.minZoom) {
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double minZoom = util::min(*animation.minZoom, startZoom, zoom);
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minZoom = util::clamp(minZoom, state.getMinZoom(), state.getMaxZoom());
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/// w<sub>m</sub>: Maximum visible span, measured in pixels with respect
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/// to the initial scale.
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double wMax = w0 / state.zoomScale(minZoom - startZoom);
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rho = std::sqrt(wMax / u1 * 2);
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}
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/// ρ²
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double rho2 = rho * rho;
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/** rᵢ: Returns the zoom-out factor at one end of the animation.
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@param i 0 for the ascent or 1 for the descent. */
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auto r = [=](double i) {
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/// bᵢ
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double b = (w1 * w1 - w0 * w0 + (i ? -1 : 1) * rho2 * rho2 * u1 * u1) / (2 * (i ? w1 : w0) * rho2 * u1);
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return std::log(std::sqrt(b * b + 1) - b);
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};
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// When u₀ = u₁, the optimal path doesn’t require both ascent and descent.
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bool isClose = std::abs(u1) < 0.000001;
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// Perform a more or less instantaneous transition if the path is too short.
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if (isClose && std::abs(w0 - w1) < 0.000001) {
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easeTo(camera, animation);
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return;
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}
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/// r₀: Zoom-out factor during ascent.
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double r0 = r(0);
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/** w(s): Returns the visible span on the ground, measured in pixels with
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respect to the initial scale.
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Assumes an angular field of view of 2 arctan ½ ≈ 53°. */
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auto w = [=](double s) {
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return (isClose ? std::exp((w1 < w0 ? -1 : 1) * rho * s)
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: (std::cosh(r0) / std::cosh(r0 + rho * s)));
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};
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/// u(s): Returns the distance along the flight path as projected onto the
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/// ground plane, measured in pixels from the world image origin at the
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/// initial scale.
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auto u = [=](double s) {
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return (isClose ? 0.
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: (w0 * (std::cosh(r0) * std::tanh(r0 + rho * s) - std::sinh(r0)) / rho2 / u1));
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};
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/// S: Total length of the flight path, measured in ρ-screenfuls.
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double S = (isClose ? (std::abs(std::log(w1 / w0)) / rho)
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: ((r(1) - r0) / rho));
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Duration duration;
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if (animation.duration) {
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duration = *animation.duration;
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} else {
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/// V: Average velocity, measured in ρ-screenfuls per second.
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double velocity = 1.2;
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if (animation.velocity) {
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velocity = *animation.velocity / rho;
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}
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duration = std::chrono::duration_cast<Duration>(std::chrono::duration<double>(S / velocity));
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}
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if (duration == Duration::zero()) {
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// Perform an instantaneous transition.
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jumpTo(camera);
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return;
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}
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const double startWorldSize = state.worldSize();
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state.Bc = startWorldSize / util::DEGREES_MAX;
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state.Cc = startWorldSize / util::M2PI;
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state.panning = true;
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state.scaling = true;
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state.rotating = angle != startAngle;
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startTransition(camera, animation, [=](double k) {
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/// s: The distance traveled along the flight path, measured in
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/// ρ-screenfuls.
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double s = k * S;
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double us = u(s);
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// Calculate the current point and zoom level along the flight path.
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ScreenCoordinate framePoint = util::interpolate(startPoint, endPoint, us);
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double frameZoom = startZoom + state.scaleZoom(1 / w(s));
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// Convert to geographic coordinates and set the new viewpoint.
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LatLng frameLatLng = {
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state.yLat(framePoint.y, startWorldSize),
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state.xLng(framePoint.x, startWorldSize),
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};
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state.setLatLngZoom(frameLatLng, frameZoom);
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if (angle != startAngle) {
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state.angle = util::wrap(util::interpolate(startAngle, angle, k), -M_PI, M_PI);
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}
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if (pitch != startPitch) {
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state.pitch = util::interpolate(startPitch, pitch, k);
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}
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if (padding) {
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state.moveLatLng(frameLatLng, center);
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}
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return Update::Zoom;
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}, duration);
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}
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#pragma mark - Position
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void Transform::moveBy(const ScreenCoordinate& offset, const Duration& duration) {
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if (!offset) return;
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ScreenCoordinate centerOffset = {
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offset.x,
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-offset.y,
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};
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ScreenCoordinate centerPoint = getScreenCoordinate() - centerOffset;
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CameraOptions camera;
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camera.center = state.screenCoordinateToLatLng(centerPoint);
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easeTo(camera, duration);
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}
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void Transform::setLatLng(const LatLng& latLng, const Duration& duration) {
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setLatLng(latLng, optional<ScreenCoordinate> {}, duration);
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}
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void Transform::setLatLng(const LatLng& latLng, optional<EdgeInsets> padding, const Duration& duration) {
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if (!latLng) return;
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CameraOptions camera;
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camera.center = latLng;
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camera.padding = padding;
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easeTo(camera, duration);
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}
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void Transform::setLatLng(const LatLng& latLng, optional<ScreenCoordinate> anchor, const Duration& duration) {
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if (!latLng) return;
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CameraOptions camera;
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camera.center = latLng;
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if (anchor) {
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EdgeInsets padding;
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padding.top = anchor->y;
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padding.left = anchor->x;
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padding.bottom = state.height - anchor->y;
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padding.right = state.width - anchor->x;
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if (padding) camera.padding = padding;
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}
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easeTo(camera, duration);
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}
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void Transform::setLatLngZoom(const LatLng& latLng, double zoom, const Duration& duration) {
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setLatLngZoom(latLng, zoom, EdgeInsets {}, duration);
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}
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void Transform::setLatLngZoom(const LatLng& latLng, double zoom, optional<EdgeInsets> padding, const Duration& duration) {
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if (!latLng || std::isnan(zoom)) return;
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CameraOptions camera;
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camera.center = latLng;
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camera.padding = padding;
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camera.zoom = zoom;
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easeTo(camera, duration);
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}
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LatLng Transform::getLatLng(optional<EdgeInsets> padding) const {
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if (padding && *padding) {
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return screenCoordinateToLatLng(padding->getCenter(state.width, state.height));
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} else {
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return state.getLatLng();
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}
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}
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ScreenCoordinate Transform::getScreenCoordinate(optional<EdgeInsets> padding) const {
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if (padding && *padding) {
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return padding->getCenter(state.width, state.height);
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} else {
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return { state.width / 2., state.height / 2. };
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}
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}
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#pragma mark - Zoom
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void Transform::scaleBy(double ds, const Duration& duration) {
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scaleBy(ds, optional<ScreenCoordinate> {}, duration);
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}
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void Transform::scaleBy(double ds, optional<ScreenCoordinate> anchor, const Duration& duration) {
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double scale = util::clamp(state.scale * ds, state.min_scale, state.max_scale);
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setScale(scale, anchor, duration);
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}
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void Transform::setZoom(double zoom, const Duration& duration) {
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setZoom(zoom, optional<ScreenCoordinate> {}, duration);
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}
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void Transform::setZoom(double zoom, optional<ScreenCoordinate> anchor, const Duration& duration) {
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setScale(state.zoomScale(zoom), anchor, duration);
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}
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void Transform::setZoom(double zoom, optional<EdgeInsets> padding, const Duration& duration) {
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setScale(state.zoomScale(zoom), padding, duration);
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}
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double Transform::getZoom() const {
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return state.getZoom();
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}
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double Transform::getScale() const {
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return state.scale;
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}
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void Transform::setScale(double scale, const Duration& duration) {
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setScale(scale, optional<ScreenCoordinate> {}, duration);
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}
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void Transform::setScale(double scale, optional<ScreenCoordinate> anchor, const Duration& duration) {
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if (std::isnan(scale)) return;
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CameraOptions camera;
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camera.zoom = state.scaleZoom(scale);
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camera.anchor = anchor;
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easeTo(camera, duration);
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}
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void Transform::setScale(double scale, optional<EdgeInsets> padding, const Duration& duration) {
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optional<ScreenCoordinate> anchor;
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if (padding) anchor = getScreenCoordinate(padding);
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setScale(scale, anchor, duration);
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}
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void Transform::setMinZoom(const double minZoom) {
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if (std::isnan(minZoom)) return;
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state.setMinZoom(minZoom);
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}
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void Transform::setMaxZoom(const double maxZoom) {
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if (std::isnan(maxZoom)) return;
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state.setMaxZoom(maxZoom);
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}
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#pragma mark - Angle
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void Transform::rotateBy(const ScreenCoordinate& first, const ScreenCoordinate& second, const Duration& duration) {
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if (!first || !second) {
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return;
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}
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ScreenCoordinate center = getScreenCoordinate();
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const ScreenCoordinate offset = first - center;
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const double distance = std::sqrt(std::pow(2, offset.x) + std::pow(2, offset.y));
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// If the first click was too close to the center, move the center of rotation by 200 pixels
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// in the direction of the click.
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if (distance < 200) {
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const double heightOffset = -200;
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const double rotateAngle = std::atan2(offset.y, offset.x);
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center.x = first.x + std::cos(rotateAngle) * heightOffset;
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center.y = first.y + std::sin(rotateAngle) * heightOffset;
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}
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const ScreenCoordinate newFirst = first - center;
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const ScreenCoordinate newSecond = second - center;
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const double ang = state.angle + util::angle_between(newFirst.x, newFirst.y, newSecond.x, newSecond.y);
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CameraOptions camera;
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camera.angle = ang;
|
||
easeTo(camera, duration);
|
||
}
|
||
|
||
void Transform::setAngle(double angle, const Duration& duration) {
|
||
setAngle(angle, optional<ScreenCoordinate> {}, duration);
|
||
}
|
||
|
||
void Transform::setAngle(double angle, optional<ScreenCoordinate> anchor, const Duration& duration) {
|
||
if (std::isnan(angle)) return;
|
||
CameraOptions camera;
|
||
camera.angle = angle;
|
||
camera.anchor = anchor;
|
||
easeTo(camera, duration);
|
||
}
|
||
|
||
void Transform::setAngle(double angle, optional<EdgeInsets> padding, const Duration& duration) {
|
||
optional<ScreenCoordinate> anchor;
|
||
if (padding && *padding) anchor = getScreenCoordinate(padding);
|
||
setAngle(angle, anchor, duration);
|
||
}
|
||
|
||
double Transform::getAngle() const {
|
||
return state.angle;
|
||
}
|
||
|
||
#pragma mark - Pitch
|
||
|
||
void Transform::setPitch(double pitch, const Duration& duration) {
|
||
setPitch(pitch, optional<ScreenCoordinate> {}, duration);
|
||
}
|
||
|
||
void Transform::setPitch(double pitch, optional<ScreenCoordinate> anchor, const Duration& duration) {
|
||
if (std::isnan(pitch)) return;
|
||
CameraOptions camera;
|
||
camera.pitch = pitch;
|
||
camera.anchor = anchor;
|
||
easeTo(camera, duration);
|
||
}
|
||
|
||
double Transform::getPitch() const {
|
||
return state.pitch;
|
||
}
|
||
|
||
#pragma mark - North Orientation
|
||
|
||
void Transform::setNorthOrientation(NorthOrientation orientation) {
|
||
state.orientation = orientation;
|
||
state.constrain(state.scale, state.x, state.y);
|
||
}
|
||
|
||
NorthOrientation Transform::getNorthOrientation() const {
|
||
return state.getNorthOrientation();
|
||
}
|
||
|
||
#pragma mark - Constrain mode
|
||
|
||
void Transform::setConstrainMode(mbgl::ConstrainMode mode) {
|
||
state.constrainMode = mode;
|
||
state.constrain(state.scale, state.x, state.y);
|
||
}
|
||
|
||
ConstrainMode Transform::getConstrainMode() const {
|
||
return state.getConstrainMode();
|
||
}
|
||
|
||
#pragma mark - Transition
|
||
|
||
void Transform::startTransition(const CameraOptions& camera,
|
||
const AnimationOptions& animation,
|
||
std::function<Update(double)> frame,
|
||
const Duration& duration) {
|
||
if (transitionFinishFn) {
|
||
transitionFinishFn();
|
||
}
|
||
|
||
bool isAnimated = duration != Duration::zero();
|
||
view.notifyMapChange(isAnimated ? MapChangeRegionWillChangeAnimated : MapChangeRegionWillChange);
|
||
|
||
// Associate the anchor, if given, with a coordinate.
|
||
optional<ScreenCoordinate> anchor = camera.anchor;
|
||
LatLng anchorLatLng;
|
||
if (anchor && *anchor) {
|
||
anchor->y = state.getHeight() - anchor->y;
|
||
anchorLatLng = state.screenCoordinateToLatLng(*anchor);
|
||
}
|
||
|
||
transitionStart = Clock::now();
|
||
transitionDuration = duration;
|
||
|
||
transitionFrameFn = [isAnimated, animation, frame, anchor, anchorLatLng, this](const TimePoint now) {
|
||
float t = isAnimated ? (std::chrono::duration<float>(now - transitionStart) / transitionDuration) : 1.0;
|
||
Update result;
|
||
if (t >= 1.0) {
|
||
result = frame(1.0);
|
||
} else {
|
||
util::UnitBezier ease = animation.easing ? *animation.easing : util::UnitBezier(0, 0, 0.25, 1);
|
||
result = frame(ease.solve(t, 0.001));
|
||
}
|
||
|
||
if (anchor && *anchor) state.moveLatLng(anchorLatLng, *anchor);
|
||
|
||
// At t = 1.0, a DidChangeAnimated notification should be sent from finish().
|
||
if (t < 1.0) {
|
||
if (animation.transitionFrameFn) {
|
||
animation.transitionFrameFn(t);
|
||
}
|
||
view.notifyMapChange(MapChangeRegionIsChanging);
|
||
} else {
|
||
transitionFinishFn();
|
||
transitionFinishFn = nullptr;
|
||
|
||
// This callback gets destroyed here,
|
||
// we can only return after this point.
|
||
transitionFrameFn = nullptr;
|
||
}
|
||
return result;
|
||
};
|
||
|
||
transitionFinishFn = [isAnimated, animation, this] {
|
||
state.panning = false;
|
||
state.scaling = false;
|
||
state.rotating = false;
|
||
if (animation.transitionFinishFn) {
|
||
animation.transitionFinishFn();
|
||
}
|
||
view.notifyMapChange(isAnimated ? MapChangeRegionDidChangeAnimated : MapChangeRegionDidChange);
|
||
};
|
||
|
||
if (!isAnimated) {
|
||
transitionFrameFn(Clock::now());
|
||
}
|
||
}
|
||
|
||
bool Transform::inTransition() const {
|
||
return transitionFrameFn != nullptr;
|
||
}
|
||
|
||
Update Transform::updateTransitions(const TimePoint& now) {
|
||
return transitionFrameFn ? transitionFrameFn(now) : Update::Nothing;
|
||
}
|
||
|
||
void Transform::cancelTransitions() {
|
||
if (transitionFinishFn) {
|
||
transitionFinishFn();
|
||
}
|
||
|
||
transitionFrameFn = nullptr;
|
||
transitionFinishFn = nullptr;
|
||
}
|
||
|
||
void Transform::setGestureInProgress(bool inProgress) {
|
||
state.gestureInProgress = inProgress;
|
||
}
|
||
|
||
#pragma mark Conversion and projection
|
||
|
||
ScreenCoordinate Transform::latLngToScreenCoordinate(const LatLng& latLng) const {
|
||
if (!latLng) return ScreenCoordinate::null();
|
||
|
||
// If the center and point longitudes are not in the same side of the
|
||
// antimeridian, we unwrap the point longitude so it would be seen if
|
||
// e.g. the next antimeridian side is visible.
|
||
LatLng unwrappedLatLng = latLng.wrapped();
|
||
unwrappedLatLng.unwrapForShortestPath(getLatLng());
|
||
ScreenCoordinate point = state.latLngToScreenCoordinate(unwrappedLatLng);
|
||
point.y = state.height - point.y;
|
||
return point;
|
||
}
|
||
|
||
LatLng Transform::screenCoordinateToLatLng(const ScreenCoordinate& point) const {
|
||
if (!point) return LatLng::null();
|
||
|
||
ScreenCoordinate flippedPoint = point;
|
||
flippedPoint.y = state.height - flippedPoint.y;
|
||
return state.screenCoordinateToLatLng(flippedPoint);
|
||
}
|