CODEWITHSUNDEEP
androidrotatetransform
Sangu
Sangu

Reputation: 53

Android- Rotate image with single finger gesture

I want to know about How to rotate the bitmap image with single touch gestures.kindly help and suggest some solutions. I done scaling the bitmap with the help of

http://grishma102.blogspot.in/2013/10/drag-and-drop-functionality-to-move.html . Now I need to rotate the whole image while touch and rotate the resize button. How to acheive it?

Thanks in advance

enter image description here

Upvotes: 5

Views: 7336

Answers (2)

joseRo
joseRo

Reputation: 1347

function that handles rotation with one finger, the main idea is to calculate the centerX and centerY of your view and taking into consideration the status bar height if you using one. 

       @Override
       public boolean onTouch(View view, MotionEvent event) { 
         switch (action) {
                case MotionEvent.ACTION_UP:
                    break;
                case MotionEvent.ACTION_DOWN:

                    rotateX = event.getRawX();
                    rotateY = event.getRawY();

                    centerX = view.getX() + ((View) getParent()).getX() + (float) view.getWidth() / 2;

                    centerY = view.getY() + statusBarHeight + (float) view.getHeight() / 2;

                    break;

                case MotionEvent.ACTION_MOVE:

                    newRotateX = event.getRawX();
                    newRotateY = event.getRawY();

                    double angle = Math.atan2(event.getRawY() - centerY, event.getRawX() - centerX) * 180 / Math.PI;

                    view.setRotation((float) angle - 45);

                    rotateX = newRotateX;
                    rotateY = newRotateY;

            }
        }

        return true;
    }
};

Upvotes: 0

GrIsHu
GrIsHu

Reputation: 23638

Check out my blogspot in which i have tried to implement the functionality of stretch the image on arrow click and also delete it, and also you can move the image on the screen using gesture.

Drag-Drop image Also check out the Demo of DragDropImage

enter image description here

Upvotes: 5

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