[英]Rotating an image around a specified point doesn't work! (Android)
I'm rotating an ImageView with postRotate(float degrees, float px, float py), setting px and py to a few differnt values including (0,0) and (imgView.getHeight(),imgView.getWidth()) but it refuses to rotate around any other point than the center. 我正在使用postRotate(浮点数,浮点数px,浮点py)旋转ImageView,将px和py设置为几个不同的值,包括(0,0)和(imgView.getHeight(),imgView.getWidth())但它拒绝围绕中心以外的任何其他点旋转。 I'm wondering whether it's got anything to do with the fact that my gravity is center in the LinearLayout?
我想知道它是否与我的引力在LinearLayout中心的事实有关?
My layout: 我的布局:
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center">
<ImageView
android:id="@+id/imageTraj"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="matrix"
android:src="@drawable/impactangle" />
How I'm rotating the image: 我是如何旋转图像的:
matrix.postRotate(degrees,imageView.getHeight(),imageView.getWidth());
imageView.setImageBitmap(Bitmap.createBitmap(imageScaled, 0, 0,
imageScaled.getWidth(), imageScaled.getHeight(), matrix, true));
PS I've noticed there are a few similar questions, but none of them have suitable answers. PS我注意到有一些类似的问题,但没有一个有合适的答案。
I am using a custom ImageView
where I set the angle rotation. 我正在使用自定义
ImageView
设置角度旋转。
public class CompassImage extends ImageView {
private float angleRotation;
public CompassImage(Context context) {
super(context);
}
public CompassImage(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CompassImage(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public void setAngleRotation(float angleRotation) {
this.angleRotation = angleRotation;
invalidate();
}
@Override
protected void onDraw(Canvas canvas) {
Rect clipBounds = canvas.getClipBounds();
canvas.save();
canvas.rotate(angleRotation, clipBounds.exactCenterX(), clipBounds.exactCenterY());
super.onDraw(canvas);
canvas.restore();
}
}
If you play around with clipBounds you may find that helpful. 如果你玩clipBounds,你会发现它很有帮助。
A slight "hack", you could probably adjust the image size using something like Paint.net or Gimp, depending on your OS. 轻微的“黑客”,您可以使用Paint.net或Gimp之类的东西调整图像大小,具体取决于您的操作系统。 That would make the image appear to spin on another point.
这将使图像看起来在另一点旋转。 This solution would be pointless if you are planning on using a lot of images though.
如果您计划使用大量图像,此解决方案将毫无意义。 This is a spinning cube tutorial using opengl.
这是一个使用opengl的旋转立方体教程。
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