我有一个设置，其中我有一些围绕中心的 ImageView，当用户单击一个按钮时，我希望这些 View 以椭圆方式围绕中心 View 旋转。 我目前有一个椭圆运动，但 View 在一个奇怪的轴上旋转，而不是根据需要在中心轴上旋转。
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.didasko.calculus.maca.TelaAtomo"
>
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tela_atomo_maca_central"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:src="@drawable/maca_cinza"
android:background="@null"/>
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tela_atomo_eletron_0"
android:src="@drawable/eletron_nao_completado"
android:background="@null"
android:layout_marginRight="46dp"
android:layout_toLeftOf="@+id/tela_atomo_maca_central"
android:layout_marginBottom="78dp"
android:layout_above="@+id/tela_atomo_maca_central"/>
</RelativeLayout>
tela_atomo_maca_central 是中心元素 tela_atomo_eletron_0 是我要椭圆移动的 View
final ImageButton eletron = (ImageButton) findViewById(R.id.tela_atomo_eletron_0);
//Getting all points in the ellipse
for(int i=0;i<360;i++) {
double x = 46 * Math.cos(i);
double y = 78 * Math.sin(i);
Ponto p = new Ponto(x,y);
pontos.add(p);
}
Runnable eletronRunnable = new Runnable() {
@Override
public void run() {
if (contagem < 360) {
Ponto p = pontos.get(contagem);
contagem++;
RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) eletron.getLayoutParams();
params.rightMargin = (int)p.getX();
params.bottomMargin = (int)p.getY();
eletron.setLayoutParams(params);
eletron.postDelayed(this,100);
}else {
contagem = 0;
eletron.postDelayed(this,100);
}
}
};
eletron.postDelayed(eletronRunnable,100);
}
private class Ponto {
private double x,y;
public Ponto(double x, double y) {
this.x = x;
this.y = y;
}
public double getX() {
return x;
}
public double getY() {
return y;
}
}
我可能犯了逻辑错误，因为我可以让它椭圆形地移动，而不是我想要的位置。
如何使图像围绕中心椭圆移动？
最佳答案
根据您现有的代码，我制作了一个示例项目，这是我取得的成果 - 
修改后的代码-
public class ActivityTest extends AppCompatActivity {
ImageButton eletron,center;
ArrayList<Ponto> pontos = new ArrayList<>();
int contagem = 0;
DemoRelativeLayout rel;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.so_demo);
eletron = (ImageButton) findViewById(R.id.tela_atomo_eletron_0);
center = (ImageButton) findViewById(R.id.tela_atomo_maca_central);
rel = (DemoRelativeLayout)findViewById(R.id.demo);
//Getting all points in the ellipse
for(int i=0;i<360;i++) {
double x = (200 * Math.cos(i));
double y = (400 * Math.sin(i));
Ponto p = new Ponto(x,y);
pontos.add(p);
}
eletron.postDelayed(eletronRunnable,2000);
}
@Override
protected void onStart() {
super.onStart();
rel.drawCircle(pontos,center.getX() + center.getWidth()/2,center.getY() + center.getHeight()/2);
rel.invalidate();
}
Runnable eletronRunnable = new Runnable() {
@Override
public void run() {
if (contagem < 360) {
Ponto p = pontos.get(contagem);
contagem++;
/*RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) eletron.getLayoutParams();
params.rightMargin = (int)p.getX();
params.bottomMargin = (int)p.getY();
eletron.setLayoutParams(params);*/
eletron.setTranslationX((float) p.getX() + (eletron.getWidth()/2 + center.getWidth()/2));
eletron.setTranslationY((float)p.getY() + (eletron.getHeight()/2 + center.getHeight()/2));
eletron.postDelayed(this,100);
}else {
contagem = 0;
eletron.postDelayed(this,100);
}
}
};
public class Ponto {
private double x,y;
public Ponto(double x, double y) {
this.x = x;
this.y = y;
}
public double getX() {
return x;
}
public double getY() {
return y;
}
}
我也更改了xml文件-
<com.wandertails.stackovrflw.DemoRelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="10dp"
android:background="#ffffff"
android:id="@+id/demo"
>
<ImageButton
android:layout_width="40dp"
android:layout_height="40dp"
android:id="@+id/tela_atomo_maca_central"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:src="#444444"
android:background="@null"/>
<ImageButton
android:layout_width="40dp"
android:layout_height="40dp"
android:id="@+id/tela_atomo_eletron_0"
android:src="#880080"
android:background="@null"
android:layout_toLeftOf="@+id/tela_atomo_maca_central"
android:layout_above="@+id/tela_atomo_maca_central"/>
</com.wandertails.stackovrflw.DemoRelativeLayout>
如果要绘制椭圆路径，最后是 DemoRelativeLayout -
public class DemoRelativeLayout extends RelativeLayout
{
ArrayList<ActivityTest.Ponto> pontos;
float cntrX,cntrY;
public DemoRelativeLayout(Context context) {
super(context);
}
public DemoRelativeLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public DemoRelativeLayout(Context context, AttributeSet attrs, intdefStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
protected void dispatchDraw(Canvas canvas) {
super.dispatchDraw(canvas);
if(pontos != null){
Paint p = new Paint();
p.setColor(Color.RED);
for (ActivityTest.Ponto pt : pontos){
float x = (float)pt.getX() + cntrX;
float y = (float)pt.getY() + cntrY;
canvas.drawCircle(x,y,5,p);
}
}
}
public void drawCircle(ArrayList<ActivityTest.Ponto> pp,float x,float y){
cntrX = x;
cntrY = y;
pontos = pp;
}
}
我希望这就是你想要的..
关于java - 围绕 RelativeView 的中心椭圆移动 ImageView，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38212431/