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Simple-Camera
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implement pinch zooming

This commit is contained in:
tibbi 2016-08-28 23:24:30 +02:00
parent a43d82d8a0
commit 73f17fe8ed
1 changed files with 42 additions and 3 deletions
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43
app/src/main/java/com/simplemobiletools/camera/Preview.java
View File

@ -50,6 +50,7 @@ public class Preview extends ViewGroup
private static Uri mTargetUri;
private static Context mContext;
private static ScaleGestureDetector mScaleGestureDetector;
private static List<Integer> mZoomRatios;
private static boolean mCanTakePicture;
private static boolean mIsFlashEnabled;
@ -64,6 +65,7 @@ public class Preview extends ViewGroup
private static int mLastClickY;
private static int mInitVideoRotation;
private static int mCurrCameraId;
private static int mMaxZoom;
public Preview(Context context) {
super(context);
@ -120,6 +122,8 @@ public class Preview extends ViewGroup
mCamera = newCamera;
if (mCamera != null) {
mParameters = mCamera.getParameters();
mMaxZoom = mParameters.getMaxZoom();
mZoomRatios = mParameters.getZoomRatios();
mSupportedPreviewSizes = mParameters.getSupportedPreviewSizes();
Collections.sort(mSupportedPreviewSizes, new SizesComparator());
requestLayout();
@ -165,8 +169,41 @@ public class Preview extends ViewGroup
mScaleGestureDetector = new ScaleGestureDetector(mContext, new ScaleGestureDetector.SimpleOnScaleGestureListener() {
@Override
public boolean onScale(ScaleGestureDetector detector) {
final float factor = detector.getScaleFactor();
return super.onScale(detector);
int zoomFactor = mParameters.getZoom();
float zoomRatio = mZoomRatios.get(zoomFactor) / 100.f;
zoomRatio *= detector.getScaleFactor();
int newZoomFactor = zoomFactor;
if (zoomRatio <= 1.f) {
newZoomFactor = 0;
} else if (zoomRatio >= mZoomRatios.get(mMaxZoom) / 100.f) {
newZoomFactor = mMaxZoom;
} else {
if (detector.getScaleFactor() > 1.f) {
for (int i = zoomFactor; i < mZoomRatios.size(); i++) {
if (mZoomRatios.get(i) / 100.0f >= zoomRatio) {
newZoomFactor = i;
break;
}
}
} else {
for (int i = zoomFactor; i >= 0; i--) {
if (mZoomRatios.get(i) / 100.0f <= zoomRatio) {
newZoomFactor = i;
break;
}
}
}
}
newZoomFactor = Math.max(newZoomFactor, 0);
newZoomFactor = Math.min(mMaxZoom, newZoomFactor);
mParameters.setZoom(newZoomFactor);
if (mCamera != null)
mCamera.setParameters(mParameters);
return true;
}
});
}
@ -555,6 +592,8 @@ public class Preview extends ViewGroup
public boolean onTouch(View v, MotionEvent event) {
mLastClickX = (int) event.getX();
mLastClickY = (int) event.getY();
if (mMaxZoom > 0)
mScaleGestureDetector.onTouchEvent(event);
return false;
}