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Likhanov
Asked:2020-09-27 12:25:52 +0000 UTC2020-09-27 12:25:52 +0000 UTC

Android 旋转文字

  • 772

我不明白如何旋转文本。

有一个代码

  public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(new RotateText(this));
    }

    private class RotateText extends View {

        private Paint fontPaint;
        private String mText = "Rotate text";
        private int fontSize = 100;
        private float[] widths;

        public RotateText(Context context) {
            super(context);
            fontPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
            fontPaint.setTextSize(fontSize);
            fontPaint.setStyle(Paint.Style.STROKE);

            width = fontPaint.measureText(mText);

            widths = new float[mText.length()];
            fontPaint.getTextWidths(mText, widths);
        }

        @Override
        protected void onDraw(Canvas canvas) {
            super.onDraw(canvas);

            canvas.drawARGB(80, 102, 204, 255);

            canvas.translate(350, 550);

            canvas.drawText(mText, 0, 0, fontPaint);

        }
    }
}

如何使文本不断旋转，最好以给定的加速度。

android

1 个回答

  1. Best Answer

    试试看

    ObjectAnimatior.ofFloat(view,"rotation",0,360).start();

    或者最坏的情况是

    <?xml version="1.0" encoding="UTF-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="1600"
    android:fromDegrees="358"
    android:interpolator="@android:anim/linear_interpolator"
    android:pivotX="50%"
    android:pivotY="50%"
    android:repeatCount="infinite"
    android:toDegrees="0" />

    你也可以喜欢这个

    Matrix matrix = new Matrix();

float angle = (float) (System.currentTimeMillis() % ROTATE_TIME_MILLIS) 
   / ROTATE_TIME_MILLIS * 360;
matrix.reset();
matrix.postTranslate(-source.getWidth() / 2, -source.getHeight() / 2);
matrix.postRotate(angle);
matrix.postTranslate(centerX, centerY)
canvas.drawBitmap(source, matrix, null);
invalidate(); // Cause a re-draw

    这是给你的一段代码

    Bitmap bmpLayered = Bitmap.createBitmap(bmpMain.getWidth(), bmpMain
                .getHeight(), Bitmap.Config.ARGB_8888);
        Canvas cv = new Canvas(bmpLayered);

Paint charPaint = new Paint();
        charPaint.setAntiAlias(true);
        charPaint.setStyle(Paint.Style.FILL);
        charPaint.setTextSize(24);
        charPaint.setColor(Color.BLACK);
        charPaint.setStrokeWidth(3);

cv.drawText("None", 570, 222, charPaint);

    //--------------------------------

       cv.save();
    cv.rotate(-45, x, y);
    cv.drawText("your text here", x, y, paint);
    cv.restore();

    其中 cv 是指您要绘制的画布 x 和 y。你也可以做到的

    cv.rotate(45f);

cv.rotate(45f, 100, 100);

    这是主的最后一个例子）

    public class SView extends View {

    Paint p,paint; 
    public SView(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
        p = new Paint();
        p.setColor(Color.RED);
        p.setTextSize(40);
        paint = new Paint();
        paint.setColor(Color.BLUE);
        paint.setTextSize(40);
    }
  @Override 
  protected void onDraw(Canvas canvas) {
      super.onDraw(canvas);
      int cx = this.getMeasuredWidth() / 2;
      int cy = this.getMeasuredHeight() / 2;

      canvas.drawText("3AM", cx, cy, paint);
      canvas.save(); 

      canvas.scale(1f, -1f, cx, cy);
      canvas.drawText("3AM", cx, cy, p);
      canvas.restore();
}
}

    在输出你会得到这个 在此处输入图像描述

    • 0

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