自定义控件（30）---绘图区域（Range）

本文主要是介绍自定义控件（30）---绘图区域（Range），希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

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


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);  }   }  }  

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