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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