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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