Android 绘制太极图

绘制一个太极图实现代码：

package com.jackie.taijicircle; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.RectF; import android.util.AttributeSet; import android.view.View; /** * Created by Administrator on 2016/11/14. */ public class TaijiCircleView extends View { private Paint mPaint; private int mWidth; public TaijiCircleView(Context context) { this(context, null); } public TaijiCircleView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public TaijiCircleView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); initPaint(); } private void initPaint() { mPaint = new Paint(); mPaint.setColor(Color.BLACK); mPaint.setStrokeWidth(5); mPaint.setAntiAlias(true); mPaint.setDither(true); mPaint.setStyle(Paint.Style.FILL); } private void drawCircle(Canvas canvas) { mPaint.setColor(Color.BLACK); //x轴正轴为0° // canvas.drawArc(new RectF(0, 0, width, width), 90, 180, true, mPaint); canvas.drawArc(new RectF(0, 0, mWidth, mWidth), 270, -180, true, mPaint); mPaint.setColor(Color.WHITE); // canvas.drawArc(new RectF(0, 0, width, width), 90, -180, true, mPaint); canvas.drawArc(new RectF(0, 0, mWidth, mWidth), 270, 180, true, mPaint); } private void drawHalfCircle(Canvas canvas) { mPaint.setColor(Color.BLACK); canvas.drawArc(new RectF(mWidth / 4, 0, mWidth / 2 + mWidth / 4, mWidth / 2), 270, 180, true, mPaint); mPaint.setColor(Color.WHITE); canvas.drawArc(new RectF(mWidth / 4, mWidth / 2, mWidth / 2 + mWidth / 4, mWidth), 270, -180, true, mPaint); } private void drawSmallCircle(Canvas canvas) { mPaint.setColor(Color.BLACK); canvas.drawCircle(mWidth / 2, mWidth * 3 / 4, 20, mPaint); mPaint.setColor(Color.WHITE); canvas.drawCircle(mWidth / 2, mWidth / 4, 20, mPaint); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); mWidth = Math.min(getWidth(), getHeight()); drawCircle(canvas); drawHalfCircle(canvas); drawSmallCircle(canvas); } }

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