Android编程绘图操作之弧形绘制方法示例

/** * 绘制弧形图案 * @description： * @author ldm * @date 2016-4-25 下午4:37:01 */public class ArcsActivity extends Activity {  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(new SampleView(this));  }  /**   * 自定义绘制图案的View   *   * @description：   * @author ldm   * @date 2016-4-25 下午4:19:40   */  private static class SampleView extends View {    // 画圆形图案的画笔数组    private Paint[] mPaints;    // 画矩形的画笔    private Paint mFramePaint;    // 是否以矩形中心画图    private boolean[] mUseCenters;    // 矩形框数组    private RectF[] mOvals;    // 上面较大的矩形框    private RectF mBigOval;    // 画圆弧起点    private float mStart;    // 画圆弧角度    private float mSweep;    // 画大图形对应角标index    private int mBigIndex;    // 角度变化增量    private static final float ANGLE_STEP = 3;    // 初始角度    private static final float START_ANGLE = 15;    public SampleView(Context context) {      super(context);      mPaints = new Paint[4];      mUseCenters = new boolean[4];      mOvals = new RectF[4];      mPaints[0] = new Paint();      mPaints[0].setAntiAlias(true);// 设置抗紧钜齿      mPaints[0].setStyle(Paint.Style.FILL);// 设置画笔填充风格      mPaints[0].setColor(0x88FF0000);// 设置颜色      mUseCenters[0] = false;      mPaints[1] = new Paint(mPaints[0]);      mPaints[1].setColor(0x8800FF00);      mUseCenters[1] = true;      mPaints[2] = new Paint(mPaints[0]);      mPaints[2].setStyle(Paint.Style.STROKE);// 设置画笔空心风格      mPaints[2].setStrokeWidth(4);// 设置画笔宽度      mPaints[2].setColor(0x880000FF);// 设置颜色      mUseCenters[2] = false;      mPaints[3] = new Paint(mPaints[2]);      mPaints[3].setColor(0x88888888);      mUseCenters[3] = true;      mBigOval = new RectF(40, 10, 280, 250);// 初始化较大的矩形      mOvals[0] = new RectF(10, 270, 70, 330);// 初始化4个较小矩形      mOvals[1] = new RectF(90, 270, 150, 330);      mOvals[2] = new RectF(170, 270, 230, 330);      mOvals[3] = new RectF(250, 270, 310, 330);      mFramePaint = new Paint();      mFramePaint.setAntiAlias(true);      mFramePaint.setStyle(Paint.Style.STROKE);      mFramePaint.setStrokeWidth(0);    }    @Override    protected void onDraw(Canvas canvas) {      canvas.drawColor(Color.WHITE);      // 画大矩形      canvas.drawRect(mBigOval, mFramePaint);      // 在大矩形分别 画4个圆弧图形      canvas.drawArc(mBigOval, mStart, mSweep, mUseCenters[mBigIndex],          mPaints[mBigIndex]);      for (int i = 0; i < 4; i++) {        canvas.drawRect(mOvals[i], mFramePaint);// 画四个小矩形        canvas.drawArc(mOvals[i], mStart, mSweep, mUseCenters[i],// 在四个小矩形中分别画圆弧            mPaints[i]);      }      mSweep += ANGLE_STEP;// 弧度改变      if (mSweep > 360) {// 弧度控制        mSweep -= 360;        mStart += START_ANGLE;        if (mStart >= 360) {          mStart -= 360;        }        mBigIndex = (mBigIndex + 1) % mOvals.length;      }      invalidate();    }  }}