我有一个png图像资源，我正在制作一个Canvas，然后在它上面绘制另一个png资源（箭头）。我想知道如何按宽度拉伸此箭头并保持高度相同？我尝试的所有方法都导致部分箭头被切断或出现其他错误。下面我粘贴了当前的尝试但是arrow3（缩放比原来更宽更短）比原来更高更宽，顶部和底部的箭头部分被切掉。感谢所有帮助
Bitmap fieldBitmapResource = BitmapFactory.decodeResource(getResources(),
R.drawable.football_field);
Bitmap fieldBitmap = fieldBitmapResource.copy(null, true);
Canvas fieldCanvas = new Canvas(fieldBitmap);
Bitmap arrowBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.back);
fieldCanvas.drawBitmap(arrowBitmap, 0, 0, null); //draw arrow to field
Bitmap arrow2 = scaleCenterCrop(arrowBitmap, 150, 155);
fieldCanvas.drawBitmap(arrow2, 1025, 573, null);
Bitmap arrow3 = scaleCenterCrop(arrowBitmap, 150, 400);
fieldCanvas.drawBitmap(arrow3, 1200, 600, null);
...
public Bitmap scaleCenterCrop(Bitmap source, int newHeight, int newWidth) {
int sourceWidth = source.getWidth();
int sourceHeight = source.getHeight();
// Compute the scaling factors to fit the new height and width, respectively.
// To cover the final image, the final scaling will be the bigger
// of these two.
float xScale = (float) newWidth / sourceWidth;
float yScale = (float) newHeight / sourceHeight;
float scale = Math.max(xScale, yScale);
// Now get the size of the source bitmap when scaled
float scaledWidth = scale * sourceWidth;
float scaledHeight = scale * sourceHeight;
// Let's find out the upper left coordinates if the scaled bitmap
// should be centered in the new size give by the parameters
float left = (newWidth - scaledWidth) / 2;
float top = (newHeight - scaledHeight) / 2;
// The target rectangle for the new, scaled version of the source bitmap will now
// be
RectF targetRect = new RectF(left, top, left + scaledWidth, top + scaledHeight);
// Finally, we create a new bitmap of the specified size and draw our new,
// scaled bitmap onto it.
Bitmap dest = Bitmap.createBitmap(newWidth, newHeight, source.getConfig());
Canvas canvas = new Canvas(dest);
canvas.drawBitmap(source, null, targetRect, null);
return dest;
}