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怎么在Android中繪制一個弧形?相信很多沒有經(jīng)驗(yàn)的人對此束手無策,為此本文總結(jié)了問題出現(xiàn)的原因和解決方法,通過這篇文章希望你能解決這個問題。
具體如下:
public class ArcsActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(new SampleView(this)); } /** * 自定義繪制圖案的View * * @description: * @author ldm * @date 2016-4-25 下午4:19:40 */ private static class SampleView extends View { // 畫圓形圖案的畫筆數(shù)組 private Paint[] mPaints; // 畫矩形的畫筆 private Paint mFramePaint; // 是否以矩形中心畫圖 private boolean[] mUseCenters; // 矩形框數(shù)組 private RectF[] mOvals; // 上面較大的矩形框 private RectF mBigOval; // 畫圓弧起點(diǎn) private float mStart; // 畫圓弧角度 private float mSweep; // 畫大圖形對應(yīng)角標(biāo)index private int mBigIndex; // 角度變化增量 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);// 設(shè)置抗緊鉅齒 mPaints[0].setStyle(Paint.Style.FILL);// 設(shè)置畫筆填充風(fēng)格 mPaints[0].setColor(0x88FF0000);// 設(shè)置顏色 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);// 設(shè)置畫筆空心風(fēng)格 mPaints[2].setStrokeWidth(4);// 設(shè)置畫筆寬度 mPaints[2].setColor(0x880000FF);// 設(shè)置顏色 mUseCenters[2] = false; mPaints[3] = new Paint(mPaints[2]); mPaints[3].setColor(0x88888888); mUseCenters[3] = true; mBigOval = new RectF(40, 10, 280, 250);// 初始化較大的矩形 mOvals[0] = new RectF(10, 270, 70, 330);// 初始化4個較小矩形 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); // 畫大矩形 canvas.drawRect(mBigOval, mFramePaint); // 在大矩形分別 畫4個圓弧圖形 canvas.drawArc(mBigOval, mStart, mSweep, mUseCenters[mBigIndex], mPaints[mBigIndex]); for (int i = 0; i < 4; i++) { canvas.drawRect(mOvals[i], mFramePaint);// 畫四個小矩形 canvas.drawArc(mOvals[i], mStart, mSweep, mUseCenters[i],// 在四個小矩形中分別畫圓弧 mPaints[i]); } mSweep += ANGLE_STEP;// 弧度改變 if (mSweep > 360) {// 弧度控制 mSweep -= 360; mStart += START_ANGLE; if (mStart >= 360) { mStart -= 360; } mBigIndex = (mBigIndex + 1) % mOvals.length; } invalidate(); } } }
靜態(tài)效果如圖:
看完上述內(nèi)容,你們掌握怎么在Android中繪制一個弧形的方法了嗎?如果還想學(xué)到更多技能或想了解更多相關(guān)內(nèi)容,歡迎關(guān)注億速云行業(yè)資訊頻道,感謝各位的閱讀!
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