Shape

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Android 中的 java代码 shape讲解

1.类型

2.详解

（1）Shape的详解

Shape是其他类的基类，可以绘制任何的集合图形，通过自己德尔ondraw（）方法。

public class  MyView extends View{    public MyView(Context context) {        super(context);    }    Shape shape=new Shape() {        @Override        public void draw(Canvas canvas, Paint paint) {                       canvas.drawCircle(shape.getWidth(),shape.getHeight(),shape.getWidth()/2,paint);        }    };    @Override    protected void onDraw(Canvas canvas) {            super.onDraw(canvas);            Paint paint=new Paint();

            paint.setColor(Color.BLUE);            paint.setAntiAlias(true);            paint.setStrokeWidth(40);            paint.setStyle(Paint.Style.STROKE);
            shape.resize(800,800);//设置大小            shape.draw(canvas, paint);    }}

当你创建一个shape对象，要求重写public voiddraw(Canvas canvas, Paint paint)方法，shape.draw()执行时需要将画布和画笔传入。

（2）RectShape（矩形）的详解（shape直接子类）

public  class  RectView extends View{    RectShape rectShape;    public RectView(Context context) {        super(context);        rectShape=new RectShape();        rectShape.resize(400, 400);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        Paint paint=new Paint();        paint.setColor(Color.BLUE);        paint.setStyle(Paint.Style.STROKE);        rectShape.draw(canvas,paint);    }}

    很简单，只要设定画布，画笔，宽高，即可！

   （3）PathShape(shape的直接子类)

public  class pathView extends View{    PathShape pathShape;    public pathView(Context context) {        super(context);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        canvas.drawColor(Color.BLUE);        Path path1=new Path();        path1.moveTo(100, 100);        path1.lineTo(200, 200);        path1.lineTo(400, 800);        //path1.close();        Paint paint=new Paint();        paint.setColor(Color.BLACK);        paint.setStyle(Paint.Style.FILL);        pathShape=new PathShape(path1,100,100);        pathShape.resize(300,300);        pathShape.draw(canvas,paint);    }}
1.必须要调用pathShape.resize(300,300)方法，否则无法显示。

2.pathShape=new PathShape(path1,stdwidth,stdheight);这个里边的宽高为标准宽高。
  以后通过pathShape.resize(width,height)来修改宽高，
  宽为：canvas.scale(width/stdwidth)
  高为：canvas.scale（height/stdheight）

（3）ArcShape的详解（shape直接子类）

public  class ArcView extends View{    public ArcView(Context context) {        super(context);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        ArcShape arcShape=new ArcShape(0,-90);        arcShape.resize(500,800);        Paint paint=new Paint();        paint.setColor(Color.BLACK);        paint.setStyle(Paint.Style.FILL);        arcShape.draw(canvas,paint);    }}

1.必须制定尺寸 arcShape.resize(500,800);

2.以制定的尺寸所形成的集合图形的中心进行扇形截图

（4）OvalShape（圆形或者椭圆）（shape直接子类）

public  class OvalView extends View{    public OvalView(Context context) {        super(context);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        OvalShape ovalShape=new OvalShape();        ovalShape.resize(500,800);        Paint paint=new Paint();        paint.setColor(Color.RED);        paint.setStyle(Paint.Style.FILL);        ovalShape.draw(canvas,paint);    }}

1.必须制定尺寸 arcShape.resize(500,800);

2.以制定的尺寸所形成的集合图形的中心进行绘制圆形或者椭圆

（5）RoundRectShape（圆角矩形）

public class  roundView extends View{    public roundView(Context context) {        super(context);    }    RectF r=new RectF(100,100,300,100);    float jiao[]={20,20,20,20,20,20,20,20};    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        RoundRectShape roundRectShape=new RoundRectShape(jiao,r,jiao);        roundRectShape.resize(800,800);        Paint paint=new Paint();        paint.setColor(Color.RED);        paint.setStyle(Paint.Style.STROKE);        roundRectShape.draw(canvas,paint);    }}

1.构造函数中的第一个函数圆角的度数，前两个为左上角，在两个为右上角，在两个为右下角，在两个为左下角

2.第二个参数为，RectF（），他会把这个矩形套在外边矩形内部。注意：

RectF(100,100,300,100)的四个参数是距离外部矩形的边的长度

3.第三个参数为内部矩形的圆角，如果第二个参数为空，第三个参数直接被忽略、

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