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author | Łukasz Paczos <lukas.paczos@gmail.com> | 2019-07-12 15:29:30 +0200 |
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committer | Łukasz Paczos <lukasz.paczos@mapbox.com> | 2019-08-15 18:08:29 +0300 |
commit | 18971395d67d5014f571035382762f51be6ff2fb (patch) | |
tree | 37f4e455218ea6bf2a936f2ec18e5f2cd9641918 /platform/android/MapboxGLAndroidSDK/src/main/java/com | |
parent | 09fd9dace6918630a3d961841105d78be8f55445 (diff) | |
download | qtlocation-mapboxgl-18971395d67d5014f571035382762f51be6ff2fb.tar.gz |
[android] improve scale inertia
Diffstat (limited to 'platform/android/MapboxGLAndroidSDK/src/main/java/com')
2 files changed, 17 insertions, 2 deletions
diff --git a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/constants/MapboxConstants.java b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/constants/MapboxConstants.java index d490fd3900..e9fc9e2e02 100644 --- a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/constants/MapboxConstants.java +++ b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/constants/MapboxConstants.java @@ -79,6 +79,16 @@ public class MapboxConstants { public static final float ROTATION_THRESHOLD_INCREASE_WHEN_SCALING = 25f; /** + * Maximum absolute zoom change for multi-pointer scale velocity animation + */ + public static final double MAX_ABSOLUTE_SCALE_VELOCITY_CHANGE = 2.5; + + /** + * Scale velocity animation duration multiplier. + */ + public static final double SCALE_VELOCITY_ANIMATION_DURATION_MULTIPLIER = 150; + + /** * Time within which user needs to lift fingers for velocity animation to start. */ public static final long SCHEDULED_ANIMATION_TIMEOUT = 150L; diff --git a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/MapGestureDetector.java b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/MapGestureDetector.java index 74a864a6a1..77d59e1690 100644 --- a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/MapGestureDetector.java +++ b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/MapGestureDetector.java @@ -30,6 +30,8 @@ import java.util.List; import java.util.Set; import java.util.concurrent.CopyOnWriteArrayList; +import static com.mapbox.mapboxsdk.constants.MapboxConstants.MAX_ABSOLUTE_SCALE_VELOCITY_CHANGE; +import static com.mapbox.mapboxsdk.constants.MapboxConstants.SCALE_VELOCITY_ANIMATION_DURATION_MULTIPLIER; import static com.mapbox.mapboxsdk.constants.MapboxConstants.ZOOM_RATE; import static com.mapbox.mapboxsdk.maps.MapboxMap.OnCameraMoveStartedListener.REASON_API_GESTURE; @@ -558,7 +560,9 @@ final class MapGestureDetector { double zoomAddition = calculateScale(velocityXY, detector.isScalingOut()); double currentZoom = transform.getRawZoom(); PointF focalPoint = getScaleFocalPoint(detector); - long animationTime = (long) (Math.abs(zoomAddition) * 1000 / 4); + // (log(x + 1 / e^2) + 2) * 150, x=0 to 2.5 (MapboxConstants#MAX_ABSOLUTE_SCALE_VELOCITY_CHANGE) + long animationTime = (long) ((Math.log((Math.abs(zoomAddition)) + 1 / Math.pow(Math.E, 2)) + 2) + * SCALE_VELOCITY_ANIMATION_DURATION_MULTIPLIER); scaleAnimator = createScaleAnimator(currentZoom, zoomAddition, focalPoint, animationTime); scheduleAnimator(scaleAnimator); } @@ -578,7 +582,8 @@ final class MapGestureDetector { } private double calculateScale(double velocityXY, boolean isScalingOut) { - double zoomAddition = (float) Math.log(velocityXY / 1000 + 1); + double zoomAddition = velocityXY * MAX_ABSOLUTE_SCALE_VELOCITY_CHANGE * 1e-4; + zoomAddition = MathUtils.clamp(zoomAddition, 0, MAX_ABSOLUTE_SCALE_VELOCITY_CHANGE); if (isScalingOut) { zoomAddition = -zoomAddition; } |