91 lines
2.9 KiB
C++
91 lines
2.9 KiB
C++
#pragma once
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#include <mbgl/util/geo.hpp>
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#include <mbgl/util/chrono.hpp>
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#include <mbgl/util/unitbezier.hpp>
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#include <mbgl/util/optional.hpp>
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#include <functional>
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namespace mbgl {
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/** Various options for describing the viewpoint of a map. All fields are
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optional. */
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struct CameraOptions {
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/** Coordinate at the center of the map. */
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optional<LatLng> center;
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/** Padding around the interior of the view that affects the frame of
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reference for `center`. */
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EdgeInsets padding;
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/** Point of reference for `zoom` and `angle`, assuming an origin at the
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top-left corner of the view. */
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optional<ScreenCoordinate> anchor;
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/** Zero-based zoom level. Constrained to the minimum and maximum zoom
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levels. */
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optional<double> zoom;
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/** Bearing, measured in radians counterclockwise from true north. Wrapped
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to [−π rad, π rad). */
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optional<double> angle;
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/** Pitch toward the horizon measured in radians, with 0 rad resulting in a
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two-dimensional map. */
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optional<double> pitch;
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};
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constexpr bool operator==(const CameraOptions& a, const CameraOptions& b) {
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return a.center == b.center
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&& a.padding == b.padding
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&& a.anchor == b.anchor
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&& a.zoom == b.zoom
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&& a.angle == b.angle
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&& a.pitch == b.pitch;
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}
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constexpr bool operator!=(const CameraOptions& a, const CameraOptions& b) {
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return !(a == b);
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}
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/** Various options for describing a transition between viewpoints with
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animation. All fields are optional; the default values depend on how this
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struct is used. */
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struct AnimationOptions {
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/** Time to animate to the viewpoint defined herein. */
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optional<Duration> duration;
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/** Average velocity of a flyTo() transition, measured in screenfuls per
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second, assuming a linear timing curve.
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A <i>screenful</i> is the visible span in pixels. It does not correspond
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to a fixed physical distance but rather varies by zoom level. */
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optional<double> velocity;
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/** Zero-based zoom level at the peak of the flyTo() transition’s flight
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path. */
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optional<double> minZoom;
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/** The easing timing curve of the transition. */
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optional<mbgl::util::UnitBezier> easing;
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/** A function that is called on each frame of the transition, just before a
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screen update, except on the last frame. The first parameter indicates
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the elapsed time as a percentage of the duration. */
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std::function<void(double)> transitionFrameFn;
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/** A function that is called once on the last frame of the transition, just
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before the corresponding screen update. */
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std::function<void()> transitionFinishFn;
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/** Creates an animation with no options specified. */
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AnimationOptions() {}
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/** Creates an animation with the specified duration. */
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AnimationOptions(Duration d)
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: duration(d) {}
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};
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} // namespace mbgl
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