onClickの中にどのように書けばcanvasが回転するかわかりません。わかる方がいましたら回答お願い致します。
java
1public class ButtonOnCanvas extends Activity { 2 3 @Override 4 public void onCreate(Bundle savedInstanceState) { 5 super.onCreate(savedInstanceState); 6 setContentView(R.layout.main); 7 8 9 Button button =(Button) findViewById(R.id.button); 10 button.setOnClickListener(listener); 11 12 13 } 14 View.OnClickListener listener = new View.OnClickListener(){ 15 @Override 16 public void onClick(View v){ 17 18 } 19 }; 20}
java
1public class CanvasTest extends View { 2 3 public int rad = 0; 4 public static final Paint paint = new Paint(); 5 public Canvas sCanvas = new Canvas(); 6 7 8 public CanvasTest(Context context, AttributeSet attrs){ 9 super(context,attrs); 10 } 11 @Override 12 public void onDraw(Canvas canvas){ 13 sCanvas = canvas; 14 paint.setAntiAlias(true); 15 canvas.translate(canvas.getWidth()/2, canvas.getHeight()/2); 16 canvas.save(); 17 canvas.rotate(rad); 18 paint.setStrokeCap(Paint.Cap.SQUARE); 19 paint.setStyle(Paint.Style.STROKE); 20 paint.setStrokeWidth(20); 21 paint.setAlpha(125); 22 RectF oval8 = new RectF(-250, -250, 250, 250); 23 24 paint.setColor(Color.BLUE);{canvas.drawArc(oval8, 0, 180, false, paint);} 25 paint.setColor(Color.RED);{canvas.drawArc(oval8, 180, 180, false, paint);} 26 canvas.restore(); 27 } 28} 29
バッドをするには、ログインかつ
こちらの条件を満たす必要があります。