Как показано ниже, на OnTouchListener вы можете увеличить свое изображение или растровое изображение. Когда ваш уровень масштабирования будет заархивирован, тогда
imageView.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
ImageView view = (ImageView) v;
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
savedMatrix.set(matrix1);
start.set(event.getX(), event.getY());
mode = DRAG;
break;
case MotionEvent.ACTION_POINTER_DOWN:
oldDist = spacing(event);
if (oldDist > 10f) {
start.set(event.getX(), event.getY());
savedMatrix.set(matrix1);
midPoint(mid, event);
// mode = POINT2;
mode = ZOOM;
}
break;
case MotionEvent.ACTION_UP:
mode = NONE;
distanceOffset = minOffset;
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
distanceOffset = minOffset;
break;
case MotionEvent.ACTION_MOVE:
if (mode == POINT2) {
newDist = spacing(event);
if (newDist - oldDist > 5f
|| newDist - oldDist < -5f) {
mode = ZOOM;
} else {
start.set(event.getX(), event.getY());
mode = DRAG;
}
} else if (mode == DRAG) {
matrix1.set(savedMatrix);
matrix1.postTranslate(event.getX() - start.x,
event.getY() - start.y);
} else if (mode == ZOOM) {
newDist = spacing(event);
if (newDist > 10f) {
matrix1.set(savedMatrix);
float scale = newDist / oldDist;
matrix1.postScale(scale, scale, mid.x,
mid.y);
finalscale = scale;
}
}
break;
}
view.setImageMatrix(matrix1);
// matrixTurning(matrix1, view);
return true; // indicate event was handled
}
});
}
Теперь начните рисовать круг на увеличенной части изображения, здесь я пишу код для простой рисования.Вы можете поместить свой код для рисования круга ниже слушателя. Надеюсь, что это полезно для вас.
mPaintView.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
PaintView view = (PaintView) v;
view.setScaleType(ImageView.ScaleType.MATRIX);
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
if (falg) {
savedMatrix.set(matrix);
start.set(event.getX(), event.getY());
mode = DRAG;
} else {
view.onTouchEvent(event);
}
break;
case MotionEvent.ACTION_POINTER_DOWN:
if (falg) {
oldDist = spacing(event);
if (oldDist > 10f) {
start.set(event.getX(), event.getY());
savedMatrix.set(matrix);
midPoint(mid, event);
mode = ZOOM;
}
}
break;
case MotionEvent.ACTION_UP:
if (falg) {
mode = NONE;
distanceOffset = minOffset;
}
case MotionEvent.ACTION_POINTER_UP:
if (falg) {
mode = NONE;
distanceOffset = minOffset;
}
break;
case MotionEvent.ACTION_MOVE:
if (falg) {
if (mode == POINT2) {
newDist = spacing(event);
if (newDist - oldDist > 5f
|| newDist - oldDist < -5f) {
mode = ZOOM;
} else {
start.set(event.getX(), event.getY());
mode = DRAG;
}
} else if (mode == DRAG) {
matrix.set(savedMatrix);
matrix.postTranslate(event.getX() - start.x,
event.getY() - start.y);
} else if (mode == ZOOM) {
newDist = spacing(event);
if (newDist > 10f) {
matrix.set(savedMatrix);
float scale = newDist / oldDist;
matrix.postScale(scale, scale, mid.x, mid.y);
finalscale = scale;
}
}
} else {
view.onTouchEvent(event);
}
break;
}
limitZoom(matrix);
view.setImageMatrix(matrix);
matrixTurning(matrix, view);
RectF r = new RectF();
matrix.mapRect(r);
scaledImageOffsetX = r.left;
scaledImageOffsetY = r.top;
return true;
}
});
}
private void limitZoom(Matrix m) {
float[] values = new float[9];
m.getValues(values);
float scaleX = values[Matrix.MSCALE_X];
float scaleY = values[Matrix.MSCALE_Y];
if(scaleX > MAX_ZOOM) {
scaleX = MAX_ZOOM;
} else if(scaleX < MIN_ZOOM) {
scaleX = MIN_ZOOM;
}
if(scaleY > MAX_ZOOM) {
scaleY = MAX_ZOOM;
} else if(scaleY < MIN_ZOOM) {
scaleY = MIN_ZOOM;
}
values[Matrix.MSCALE_X] = scaleX;
values[Matrix.MSCALE_Y] = scaleY;
m.setValues(values);
}
public boolean getFlag(boolean b) {
return falg = b;
}
PaintView.class
class PaintView extends ImageView {
private Bitmap mBitmap;
private Canvas mCanvas;
private Path mPath;
private Paint mBitmapPaint;
// onDraw
private Paint mPaint;
// onTouch
private float mX, mY;
private static final float TOUCH_TOLERANCE = 4;
public PaintView(Context context) {
this(context, null);
}
public PaintView(Context context, AttributeSet attrs) {
super(context, attrs);
mBitmap = Bitmap.createBitmap(1024, 1024, Bitmap.Config.ARGB_8888);
mPath = new Path();
mBitmapPaint = new Paint(Paint.DITHER_FLAG);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
}
@Override
protected void onDraw(Canvas canvas) {
// canvas.drawColor(0xFFAAAAAA);
super.onDraw(canvas);
mCanvas = canvas;
// canvas = mCanvas;
canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
// canvas.drawBitmap(mBitmap, PaintScreen.matrix, mBitmapPaint);
canvas.drawPath(mPath, mPaint);
}
public void clear() {
mPaint.reset();
// invalidate();
}
public void setMPaint(Paint paint) {
mPaint = paint;
}
private void touchStart(float x, float y) {
// mPath.reset();
mPath.moveTo(x, y);
mX = x;
mY = y;
}
private void touchMove(float x, float y) {
float dx = Math.abs(x - mX);
float dy = Math.abs(y - mY);
if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
mPath.quadTo(mX, mY, (x + mX) / 2, (y + mY) / 2);
mX = x;
mY = y;
}
}
private void touchUp() {
mPath.lineTo(mX, mY);
// commit the path to our offscreen
mCanvas.drawPath(mPath, mPaint);
// kill this so we don't double draw
mPath.reset();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX();
float y = event.getY();
Log.d("PaintView", "ev ->" + event.getAction());
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
touchStart(x, y);
invalidate();
break;
case MotionEvent.ACTION_MOVE:
touchMove(x, y);
invalidate();
break;
case MotionEvent.ACTION_UP:
touchUp();
invalidate();
break;
}
return true;
}
public void cMatrix(Matrix matrix) {
mCanvas.setMatrix(matrix);
}
}