安卓等边三角形

public class Mytest extends View{    public Mytest(Context context, AttributeSet set)    {        super(context,set);    }    protected void onDraw(Canvas canvas){        super.onDraw(canvas);        Paint paint=new Paint();        paint.setAntiAlias(true);        paint.setStyle(Paint.Style.STROKE);        paint.setStrokeWidth(5);        paint.setColor(Color.BLUE);        int viewwid=this.getWidth();float line=(float)java.lang.Math.sqrt(viewwid*viewwid-viewwid/2*viewwid/2);//等边三角形中间的直线float[] pts={        viewwid/2,0,viewwid,line,//1        viewwid,line,0,line,//2        0,line,viewwid/2,0,//3        viewwid/2,0,viewwid/2,line,//中线          0,line,viewwid/4*3,line/2,//中线          viewwid,line,viewwid/4,line/2//中线};canvas.drawLines(pts,paint);canvas.drawCircle(viewwid/2,line/3*2,line/3,paint);//圆    }}