Region实战SVG地图点击

Region实战SVG地图点击

转自：http://blog.csdn.net/lmj121212/article/details/72832087

效果如下：

点击相应地图位置，判断选中的区域

技术分析：
1、首先通过svg，画出图像，更加美工提供的svg文件，来到http://inloop.github.io/svg2android/
转出

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="-1dp"
    android:height="-1dp"
    android:viewportWidth="-1"
    android:viewportHeight="-1">

    <path
        android:fillColor="#CCCCCC"
        android:strokeColor="#ffffff"
        android:strokeWidth="0.5"
        android:pathData="M368.13,96.5L367.26,96.77L367.14,97.52L365.19,97.09L363.28,101.53L365.09,100.55L366.44,99.9L368,98.3L368.13,96.5zM358.84,95.81L360.35,94.95L358.2,93.84L355.43,94.81L357.25,97.52L358.84,95.81zM356.34,52.71L354.61,52.09L354.37,51.47L354.41,50.4L353.58,50.52L352.76,52.12L352.37,54.28L352.98,56.17L354.96,57.5L356.27,57.29L360.57,55.04L362.81,52.54L362.76,51.07L360.61,51.09L357.15,53.1L356.34,52.71zM373.11,38.78L372.64,38.12L371.96,37.71L370.92,36.15L368.96,35.86L367.23,36.92L366.67,37.62L364.62,38.29L363.73,38.84L363.33,40.1L362.98,43.46L363.35,44.68L364.2,45.22L365.16,41.25L366.32,39.96L367.33,39.69L368.1,40L369.95,39L370.82,39.59L371.96,41.25L372.97,42.13L373.04,41.44L372.64,40.53L372.94,39.74L373.11,38.78zM471.57,0L469.82,1.43L469.1,1.86L469.5,2.95L468.65,4.3L469.57,4.81L470.07,5.1L471.02,5.27L471.27,5.67L472.12,4.03L472.66,3.31L473.22,2.98L473.67,3.17L474.11,3.29L475,2.95L474.11,2.19L473.62,1.17L471.57,0z" />

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拿到转出的文件，进行xml解析，得到path标签的pathData属性，（其实就是多条path）
Path指令解析如下所示：

            M = moveto(M X,Y) ：将画笔移动到指定的坐标位置，相当于 android Path 里的moveTo()   
            L = lineto(L X,Y) ：画直线到指定的坐标位置，相当于 android Path 里的lineTo()   
            H = horizontal lineto(H X)：画水平线到指定的X坐标位置    
            V = vertical lineto(V Y)：画垂直线到指定的Y坐标位置    
            C = curveto(C X1,Y1,X2,Y2,ENDX,ENDY)：三次贝赛曲线    
            S = smooth curveto(S X2,Y2,ENDX,ENDY) 同样三次贝塞尔曲线，更平滑    
            Q = quadratic Belzier curve(Q X,Y,ENDX,ENDY)：二次贝赛曲线    
            T = smooth quadratic Belzier curveto(T ENDX,ENDY)：映射 同样二次贝塞尔曲线，更平滑    
            A = elliptical Arc(A RX,RY,XROTATION,FLAG1,FLAG2,X,Y)：弧线 ，相当于arcTo()  
            Z = closepath()：关闭路径（会自动绘制链接起点和终点）

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利用工具类将pathData转成一个path对象，拿到path就可以直接绘制了。
public class TaiWanSVG extends View {
private Handler handler = new Handler() {
@Override
public void dispatchMessage(Message msg) {

        }
    };
    private List areaPathItemList = new ArrayList<>();
    private AreaPathItem selectAreaPath;
    private Paint paint;
    private float Scale = 0.8f;

    public TaiWanSVG(Context context) {
        this(context, null);
    }

    public TaiWanSVG(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public void init() {
        paint = new Paint();
        paint.setAntiAlias(true);
        //开启线程，读取svg中的pathdata数据
        new Thread() {
            @Override
            public void run() {
                try {
                    InputStream ips = getResources().openRawResource(R.raw.taiwan);
                    //解析器工厂
                    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
                    //解析器对象
                    DocumentBuilder builder = factory.newDocumentBuilder();
                    //解析xml文件
                    Document document = builder.parse(ips);
                    //得到所有path节点
                    NodeList nl = document.getElementsByTagName("path");
                    for (int i = 0; i < nl.getLength(); i++) {
                        String pathData = ((Element) nl.item(i)).getAttribute("android:pathData");
                        areaPathItemList.add(new AreaPathItem(PathParser.createPathFromPathData(pathData)));
                    }
                    handler.sendEmptyMessage(1);


                } catch (ParserConfigurationException e) {
                    e.printStackTrace();
                } catch (SAXException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }.start();
    }

    @Override
    public void draw(Canvas canvas) {
        super.draw(canvas);
        if(null!=areaPathItemList&&areaPathItemList.size()>0){
            canvas.scale(Scale,Scale);
            for(AreaPathItem areaPathItem:areaPathItemList){
                if(areaPathItem!=selectAreaPath){
                    areaPathItem.draw(canvas,paint,false);

                }else{

                }
            }
            if(selectAreaPath!=null){
                selectAreaPath.draw(canvas,paint,true);
            }
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()){
          case  MotionEvent.ACTION_DOWN:
              if(null!=areaPathItemList&&areaPathItemList.size()>0){
                  for(AreaPathItem areaPathItem:areaPathItemList){
                      if(areaPathItem.isContain(event.getX()/Scale,event.getY()/Scale)){
                          selectAreaPath = areaPathItem;
                          postInvalidate();
                          break;
                      }
                  }
              }
            break;
        }
        return super.onTouchEvent(event);
    }
}

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2.通过Region判断点击的点，是否在path的区域中
要判断一个点是否在矩形范围很好判断，但是要判断一个点是否在一个不规则的范围中，则很难判断
Region这个类，可以将一个不规则的path，在一个矩形区域内，分割成很多个小的矩形区域，类似微积分，从而实现判断点是否包含在path，矩形区域是否包含或者相交于path等功能

    /**
         * Set the region to the area described by the path and clip.
         * Return true if the resulting region is non-empty. This produces a region
         * that is identical to the pixels that would be drawn by the path
         * (with no antialiasing).
         */
        public boolean setPath(Path path, Region clip) {
            return nativeSetPath(mNativeRegion, path.readOnlyNI(), clip.mNativeRegion);
        }


    public class AreaPathItem {
    private Path path;

    public AreaPathItem(Path path) {
        this.path = path;
    }

    public void draw(Canvas canvas, Paint paint, boolean isSelect) {
        if (!isSelect) {
            //绘制区域
            paint.setStyle(Paint.Style.FILL);
            paint.setColor(Color.GRAY);
            canvas.drawPath(path, paint);
            //绘制区域边界
            paint.setColor(Color.BLACK);
            paint.setStyle(Paint.Style.STROKE);
            canvas.drawPath(path, paint);

        } else {
            //绘制选中背景
            paint.setColor(Color.BLUE);
            paint.setStyle(Paint.Style.STROKE);
            paint.setShadowLayer(8,0,0,Color.BLUE);
            canvas.drawPath(path, paint);

            paint.clearShadowLayer();
            paint.setStyle(Paint.Style.FILL);
            paint.setColor(Color.BLUE);
            canvas.drawPath(path, paint);
        }

    }

    /**
     * @param x
     * @param y
     * @return path区域是否包含 x，y坐标点
     */
    public boolean isContain(float x, float y) {
        RectF rectF  = new RectF();
        path.computeBounds(rectF,false);
        Region region = new Region();
        region.setPath(path,new Region((int)rectF.left,(int)rectF.top,(int)rectF.right,(int)rectF.bottom));

        return region.contains((int)x,(int)y);
    }
}

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源码下载