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[android] - limit the scale factor for double tap zoom (#7580)

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* [android] - limit the scale factor to avoid accelerating the double tap zoom gesture

* clamp values
This commit is contained in:
Tobrun
2017-01-03 20:27:44 +01:00
committed by GitHub
parent 5ac72ce8bf
commit 654061c7d1
3 changed files with 17 additions and 1 deletions
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10
platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/constants/MapboxConstants.java
View File

@@ -82,6 +82,16 @@ public class MapboxConstants {
*/
public static final double MINIMUM_DIRECTION = 0;
/**
* The currently used minimun scale factor to clamp to when a quick zoom gesture occurs
*/
public static final float MINIMUM_SCALE_FACTOR_CLAMP = 0.65f;
/**
* The currently used maximum scale factor to clamp to when a quick zoom gesture occurs
*/
public static final float MAXIMUM_SCALE_FACTOR_CLAMP = 1.35f;
/**
* Fragment Argument Key for MapboxMapOptions
*/

7
platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/MapGestureDetector.java
View File

@@ -16,6 +16,7 @@ import com.almeros.android.multitouch.gesturedetectors.ShoveGestureDetector;
import com.almeros.android.multitouch.gesturedetectors.TwoFingerGestureDetector;
import com.mapbox.mapboxsdk.constants.MapboxConstants;
import com.mapbox.mapboxsdk.telemetry.MapboxEvent;
import com.mapbox.mapboxsdk.utils.MathUtils;
/**
* Manages gestures events on a MapView.
@@ -427,8 +428,12 @@ final class MapGestureDetector {
// arround user provided focal point
transform.zoomBy(detector.getScaleFactor(), focalPoint.x, focalPoint.y);
} else if (quickZoom) {
// clamp scale factors we feed to core #7514
float scaleFactor = MathUtils.clamp(detector.getScaleFactor(),
MapboxConstants.MINIMUM_SCALE_FACTOR_CLAMP,
MapboxConstants.MAXIMUM_SCALE_FACTOR_CLAMP);
// around center map
transform.zoomBy(detector.getScaleFactor(), uiSettings.getWidth() / 2, uiSettings.getHeight() / 2);
transform.zoomBy(scaleFactor, uiSettings.getWidth() / 2, uiSettings.getHeight() / 2);
} else {
// around gesture
transform.zoomBy(detector.getScaleFactor(), detector.getFocusX(), detector.getFocusY());