自定义控件（30）---绘图区域（Range）

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转自启舰

public void setEmpty() //置空
public boolean set(Region region)
public boolean set(Rect r)
public boolean set(int left, int top, int right, int bottom)
public boolean setPath(Path path, Region clip)//使用SetPath（）构造不规则区域

    public class MyRegionView extends View {          public MyRegionView(Context context) {              super(context);              // TODO Auto-generated constructor stub          }          @Override          protected void onDraw(Canvas canvas) {              // TODO Auto-generated method stub              super.onDraw(canvas);              //初始化画笔              Paint paint = new Paint();              paint.setColor(Color.RED);              paint.setStyle(Style.FILL);              paint.setStrokeWidth(2);              Region rgn = new Region(10,10,100,100);      //      rgn.set(100, 100, 200, 200);              drawRegion(canvas, rgn, paint);          }          //这个函数不懂没关系，下面会细讲          private void drawRegion(Canvas canvas,Region rgn,Paint paint)          {              RegionIterator iter = new RegionIterator(rgn);              Rect r = new Rect();              while (iter.next(r)) {                canvas.drawRect(r, paint);              }           }      }

未开启Set函数时
这里写图片描述

使用Set函数后，替换为新区域

使用SetPath（）构造不规则区域

    public class MyRegionView extends View {          public MyRegionView(Context context) {              super(context);              // TODO Auto-generated constructor stub          }          @Override          protected void onDraw(Canvas canvas) {              // TODO Auto-generated method stub              super.onDraw(canvas);              //初始化Paint              Paint paint = new Paint();              paint.setColor(Color.RED);              paint.setStyle(Style.FILL);              paint.setStrokeWidth(2);              //构造一个椭圆路径              Path ovalPath = new Path();              RectF rect =  new RectF(50, 50, 200, 500);                ovalPath.addOval(rect, Direction.CCW);              //SetPath时,传入一个比椭圆区域小的矩形区域,让其取交集              Region rgn = new Region();              rgn.setPath(ovalPath,new  Region(50, 50, 200, 200));              //画出路径              drawRegion(canvas, rgn, paint);          }          //这个函数不懂没关系，下面会细讲          private void drawRegion(Canvas canvas,Region rgn,Paint paint)          {              RegionIterator iter = new RegionIterator(rgn);              Rect r = new Rect();              while (iter.next(r)) {                canvas.drawRect(r, paint);              }           }      }

这里写图片描述

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