Shape

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 void draw(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、