我已经完成了这段代码。当我放大母鸡它不应该超出界限。它的工作正常。但是当它接触x = 0和y = 0的坐标时,它不会最小化。我在这里使用FLAG来控制它,我们可以使用其他东西。
int FLAG=0;
else if (mode == ZOOM) {
float newDistance = spacing(event);
Log.i("new distance ", newDistance+"");
matrix.getValues(matrixValues);
matrixX = matrixValues[2];
matrixY = matrixValues[5];
width = matrixValues[0]
* (((ImageView)view).getDrawable().getIntrinsicWidth());
height = matrixValues[4]
* (((ImageView) view).getDrawable()
.getIntrinsicHeight());
dx = event.getX() - start.x;
dy = event.getY() - start.y;
// if image will go outside left bound
if (matrixX + dx < 0) {
FLAG=1;
}
if (matrixX + dx + width > view.getWidth()) {
FLAG=1;
//dx = view.getWidth() - matrixX - width;
}
// if image will go oustside top bound
if (matrixY + dy < 0) {
FLAG=1;
//dy = -matrixY;
}
// if image will go outside bottom bound
if (matrixY + dy + height > view.getHeight()) {
FLAG=1;
//dy = view.getHeight() - matrixY - height;
}
if (matrixX + dx ==0 || matrixY + dy==0){
FLAG=0;
}
if (newDistance > 10f && FLAG==0) {
matrix.set(savedMatrix);
float scale = newDistance / oldDistance;
float[] values = new float[9];
matrix.getValues(values);
float currentScale = values[Matrix.MSCALE_X];
if (scale * currentScale > MAX_ZOOM)
scale = MAX_ZOOM / currentScale;
else if (scale * currentScale < MIN_ZOOM)
scale = MIN_ZOOM / currentScale;
matrix.postScale(scale, scale, mid.x, mid.y);
}
}
break;