Android Question How to Rotate a image with 2 Fingers

[Alexander Stolte]

Hey,

I have spent all my afternoon in the forum to look for a solution, unfortunately, success.

I use the TouchImageView Lib. and my question is how to rotate a image or a view with my 2 Fingers.

Greetings

 

[eps]

gesture lib? https://www.b4x.com/android/forum/threads/lib-gesture-detector.21502/#content

https://www.b4x.com/android/forum/threads/lib-gesture-detector.21502/#post-124815

 

[Alexander Stolte]

Yes, but i cant found a tutorial with DrawBitmapRotatet with the GestureDetector.

 

[eps]

Does this post help?

https://www.b4x.com/android/forum/threads/lib-gesture-detector.21502/page-9#post-279845

 

[Alexander Stolte]

I dont know, is that normal?

Sub Gesture_onDrag(deltaX As Float, deltaY As Float, MotionEvent As Object)
    Log("   onDrag deltaX = " & deltaX & ", deltaY = " & deltaY & ", ev = " & MotionEvent)
    pnlGreen.Left = Max(0, Min(pnlGreen.Left + deltaX, 100%x - pnlGreen.Width))
    pnlGreen.Top = Max(0, Min(pnlGreen.Top + deltaY, 100%y - pnlGreen.Height))
End Sub


Sub Gesture_onRotation(Degrees As Double, MotionEvent As Object)
    Dim jo = pnlGreen As JavaObject
    Dim Angle As Float = Degrees
    jo.RunMethod("setRotation", Array As Object(Angle))
End Sub

 

[Johan Schoeman]

Something like this.....?

https://www.b4x.com/android/forum/threads/rotaryknobview.65628/

 

[Alexander Stolte]

not quite, but already in the right direction, I am currently working on that:

 

[eps]

Great!

 

[Alexander Stolte]

Yes but the rotation does not work:

Sub Gesture_onRotation(Degrees As Double, MotionEvent As Object)
    Dim jo = img_emoji As JavaObject
    Dim Angle As Float = Degrees
    jo.RunMethod("setRotation", Array As Object(Angle))
End Sub

Sub Gesture_onDrag(deltaX As Float, deltaY As Float, MotionEvent As Object)
    Log("   onDrag deltaX = " & deltaX & ", deltaY = " & deltaY & ", ev = " & MotionEvent)
    img_emoji.Left = Max(0, Min(img_emoji.Left + deltaX, 100%x - img_emoji.Width))
    img_emoji.Top = Max(0, Min(img_emoji.Top + deltaY, 100%y - img_emoji.Height))
End Sub

 

[eps]

It looks like the centre of rotation is wrong...

 

[Alexander Stolte]

if i remove the Drag Gesture then looks so:


"

 

[eps]

Are you able to give an idea of where your fingers are in relation to the image?

I think Informatix hinted at the possible issues and solution in the thread about the gesture library

 

[Alexander Stolte]

Are you able to give an idea of where your fingers are in relation to the image?

yes:

 

[Johan Schoeman]

 

[Johan Schoeman]

 

[Alexander Stolte]

Yes this works fine, but the difficulty is now to zoom and drop.

I found something on Github, I try to wrap it

 

[Johan Schoeman]

 

[Informatix]

https://www.b4x.com/android/forum/threads/needs-help-about-gesture.83822/#post-532183

 

[Johan Schoeman]

Yes this works fine, but the difficulty is now to zoom and drop.

I found something on Github, I try to wrap it

Here is a "shortcut" wrap for the Github project that you are referring to:

1. Extract LibFiles.zip and copy the jar and xml files to your additional library folder
2. Extract DemoRes.zip and copy the folder and its contents to be on the same folder level as that of the B4A project's /Files and /Objects folders.
3. b4aMultiTouch1.zip has the B4A project - see (2) above
4. Take note of the B4A project's manifest file:

'This code will be applied to the manifest file during compilation.
'You do not need to modify it in most cases.
'See this link for for more information: https://www.b4x.com/forum/showthread.php?p=78136
AddManifestText(
<uses-sdk android:minSdkVersion="8" android:targetSdkVersion="19"/>
<supports-screens android:largeScreens="true"
    android:normalScreens="true"
    android:smallScreens="true"
    android:anyDensity="true"/>)
SetApplicationAttribute(android:icon, "@drawable/icon")
SetApplicationAttribute(android:label, "$LABEL$")
'End of default text.

AddApplicationText(<activity
            android:name="com.amitsid.dynamicaddimageview.MainActivity"
            android:label="@string/app_name" >
        </activity>)

 

[Alexander Stolte]

Here is a "shortcut" wrap for the Github project that you are referring to:

OMG, you are very, very, very fast and it works perfect. You are the best. Thanks.