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基本上我想在圖像放大時在imageView上畫線。 的問題是，我不知道如何獲得觸摸事件右座標時放大如何獲取正確的座標放大畫布或ImageView android
這裏是我的代碼：
public boolean onTouch(View v, MotionEvent event) {
ImageView view = (ImageView) v;
view.setScaleType(ImageView.ScaleType.MATRIX);
// Handle touch events here...
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN: //first finger down only
savedMatrix.set(matrix);
if (draw) {
if (i == 1) {
startX = event.getX();
startY = event.getY();
i = 2;
} else if (i == 2) {
endX = event.getX();
endY = event.getY();
onDraw();
i = 3;
} else if (i == 3) {
startX = event.getX();
startY = event.getY();
onDraw();
i = 2;
}
} else {
start.set(event.getX(), event.getY());
Log.d(TAG, "mode=DRAG");
mode = DRAG;
}
break;
case MotionEvent.ACTION_UP: //first finger lifted
case MotionEvent.ACTION_POINTER_UP: //second finger lifted
if (!draw) {
mode = NONE;
Log.d(TAG, "mode=NONE");
}
break;
case MotionEvent.ACTION_POINTER_DOWN: //second finger down
if (!draw) {
oldDist = spacing(event);
Log.d(TAG, "oldDist=" + oldDist);
if (oldDist > 10f) {
savedMatrix.set(matrix);
midPoint(mid, event);
}
}
break;
case MotionEvent.ACTION_MOVE:
if (!draw) {
if (mode == DRAG) {
matrix.set(savedMatrix);
matrix.getValues(matrixValues);
matrixX = matrixValues[2];
matrixY = matrixValues[5];
width = matrixValues[0] * (view.getDrawable().getIntrinsicWidth());
height = matrixValues[4] * (view.getDrawable().getIntrinsicHeight());
dx = event.getX() - start.x;
dy = event.getY() - start.y;
//if image will go outside left bound
if (matrixX + dx > 0) {
dx = -matrixX;
}
//if image will go outside right bound
if (matrixX + dx + width < view.getWidth()) {
dx = view.getWidth() - matrixX - width;
}
//if image will go oustside top bound
if (matrixY + dy > 0) {
dy = -matrixY;
}
//if image will go outside bottom bound
if (matrixY + dy + height < view.getHeight()) {
dy = view.getHeight() - matrixY - height;
}
matrix.postTranslate(dx, dy);
}
break;
}
} //perform the transformation.
view.setImageMatrix(matrix);
return true; // indicate event was handled
}
private float spacing(MotionEvent event) {
float x = event.getX(0) - event.getX(1);
float y = event.getY(0) - event.getY(1);
return (float) Math.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);
}
private void sizeScreen() {
DisplayMetrics displaymetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
screenHeight = displaymetrics.heightPixels;
screenWidth = displaymetrics.widthPixels;
}
下面是縮放方法
@Override
public void onClick(View v) { // Parameter v stands for the imageView that was clicked.
matrix.set(savedMatrix);
float[] values = new float[9];
matrix.getValues(values);
switch (v.getId()) {
case (R.id.bt_zoom_in):
if (!draw) {
scale = scale + 0.1f;
if (scale > MAX_ZOOM) {
scale = MAX_ZOOM;
} else if (scale < MIN_ZOOM) {
scale = MIN_ZOOM;
}
}
break;
case R.id.bt_zoom_out:
if (!draw) {
scale = scale - 0.1f;
if (scale > MAX_ZOOM) {
scale = MAX_ZOOM;
} else if (scale < MIN_ZOOM) {
scale = MIN_ZOOM;
}
//matrix.setScale(scale, scale, mid.x, mid.y);
//imageView.setImageMatrix(matrix);
}
break;
case R.id.bt_draw:
if (draw) {
draw = false;
bt_draw.setText("Draw");
} else {
draw = true;
bt_draw.setText("Finish");
}
break;
}
matrix.setScale(scale, scale, mid.x, mid.y);
imageView.setImageMatrix(matrix);
}
這裏是方法for draw
public void onDraw() {
Bitmap lineABmp = ((BitmapDrawable) imageView.getDrawable()).getBitmap();
Bitmap lineAMutBmp = lineABmp.copy(Bitmap.Config.ARGB_8888, true);
Bitmap copy = Bitmap.createBitmap(lineAMutBmp);
Canvas c = new Canvas(copy);
Paint pnt = new Paint();
pnt.setColor(Color.rgb(27, 163, 156));
pnt.setStrokeWidth(7);
c.drawLine(startX, startY, endX, endY, pnt);
imageView.setImageBitmap(copy);
}
}