android - 如何旋转android.graphics.Picture

Question

如何将 android.graphics.Picture 旋转 90 度？

*注意：不，它不是位图形式

Answer 1

如果您要覆盖onDraw()，那么您可以执行以下操作：

canvas.save();
canvas.rotate(90f, picture.getWidth()/2, picture.getHeight/2);
canvas.drawPicture(picture);
canvas.restore();

如果您只想旋转图像本身，则可以使用此方法：

public Picture rotatePicture(float degrees, Picture picture) {
    int width = picture.getWidth();
    int height = picture.getHeight();

    Picture rotatedPicture = new Picture();
    Canvas canvas = rotatedPicture.beginRecording(width, height);
    canvas.save();
    canvas.rotate(degrees, width/2, height/2);
    picture.draw(canvas);
    canvas.restore();
    rotatedPicture.endRecording();

    return rotatedPicture;
}