6
이미지를 드래그하여 확대/축소해야합니다. 여기에 드래그에게 괜찮아 작동android에서 이미지 확대/드래그
private void dragAndZoom(View v, MotionEvent event)
{
ImageView view = (ImageView) v;
view.setScaleType(ImageView.ScaleType.MATRIX);
float scale;
// Handle touch events here...
switch (event.getAction() & MotionEvent.ACTION_MASK)
{
case MotionEvent.ACTION_DOWN:
// first finger down only
savedMatrix.set(matrix);
start.set(event.getX(), event.getY());
mode = DRAG;
break;
case MotionEvent.ACTION_UP: // first finger lifted
case MotionEvent.ACTION_POINTER_UP: // second finger lifted
mode = NONE;
break;
case MotionEvent.ACTION_POINTER_DOWN: // first and second finger down
oldDist = spacing(event);
if (oldDist > 5f)
{
savedMatrix.set(matrix);
midPoint(mid, event);
mode = ZOOM;
}
break;
case MotionEvent.ACTION_MOVE:
if (mode == DRAG)
{
matrix.set(savedMatrix);
matrix.postTranslate(event.getX() - start.x, event.getY() - start.y);
}
else if (mode == ZOOM)
{
// pinch zooming
float newDist = spacing(event);
if (newDist > 5f)
{
matrix.set(savedMatrix);
scale = newDist/oldDist;
matrix.postScale(scale, scale, mid.x, mid.y);
}
}
break;
}
view.setImageMatrix(matrix); // display the transformation on screen
}
private float spacing(MotionEvent event)
{
float x = event.getX(0) - event.getX(1);
float y = event.getY(0) - event.getY(1);
return FloatMath.sqrt(x * x + y * y);
}
private void midPoint(PointF point, MotionEvent event)
{
float x = event.getX(0) + event.getX(1);
float y = event.getY(0) + event.getY(1);
point.set(x/2, y/2);
}
& 줌 작업을 수행
OnTouchListener touchAction = new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
ImageView i = (ImageView)v;
dragAndZoom(i, event);
return true;
}
};
//을 이미지 뷰에 대한 내 코드 ...
//instance variables
Matrix matrix = new Matrix();
Matrix savedMatrix = new Matrix();
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
int mode = NONE;
PointF start = new PointF();
PointF mid = new PointF();
float oldDist = 1f;
// OnTouchListener이다. 하지만 때로는 이미지가 화면 경계를 벗어나는 경우가 있습니다. UI에서 항상 이미지를 유지할 수 있습니까? 도와주세요. 미리 감사드립니다.