Android 绘制太极图实例详解

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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