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部分代码

public class MapView extends View {

    private PointF cenPointF;

    private Paint mCirPaint, pathPaint, mRtextPaint, mLtextPaint;

    private Context mContext;

    private int firstCount;

    private int firstRadius;

    private int circleRadius = 0;

    private Path mPath;

    private int besselCardinality;

    private PointUtil pointUtil;

    protected VelocityTracker mVelocityTracker;

    protected ArrayList<RectFModel> rectfList = new ArrayList<RectFModel>();

    private float scaleX, scaleY;// 缩放时 x,y坐标

    // 数据相关变量(假数据）

    private List<PointFModel> firstList;

    private List<PointFModel> secondList;

    public MapView(Context context) {

        super(context);

        mContext = context;

        initData();

        initViews();

        initAtions();

    }

    public MapView(Context context, @Nullable AttributeSet attrs) {

        super(context, attrs);

        mContext = context;

        initData();

        initViews();

        initAtions();

    }

    public MapView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {

        super(context, attrs, defStyleAttr);

        mContext = context;

        initData();

        initViews();

        initAtions();

    }

    private void initData() {

        pointUtil = new PointUtil(mContext);

        firstCount = 6;

        firstRadius = MapOpinion.getSpacing(mContext);

        circleRadius = MapOpinion.getCircleRadius(mContext);

        besselCardinality = +Util.dip2px(mContext, 30);

        mPath = new Path();

        mTran = new float[]{0, 0};

        cenPointF = new PointF();

        mCirPaint = new Paint();

        mCirPaint.setColor(Color.parseColor("#FF7200"));

        mCirPaint.setStrokeWidth(2);

        mCirPaint.setStyle(Paint.Style.FILL);

        pathPaint = new Paint();

        pathPaint.setColor(Color.parseColor("#9b9b9b"));

        pathPaint.setStrokeWidth(2);

        pathPaint.setStyle(Paint.Style.STROKE);

        pathPaint.setAntiAlias(true);

        mRtextPaint = new Paint();

        mRtextPaint.setColor(Color.parseColor("#000000"));

        mRtextPaint.setTextSize(MapOpinion.getTextSize(mContext));

        mRtextPaint.setStyle(Paint.Style.STROKE);

        mLtextPaint = new Paint();

        mLtextPaint.setColor(Color.parseColor("#000000"));

        mLtextPaint.setTextSize(MapOpinion.getTextSize(mContext));

        mLtextPaint.setTextAlign(Paint.Align.RIGHT);

        mLtextPaint.setStyle(Paint.Style.STROKE);

        mVelocityTracker = VelocityTracker.obtain();

        firstList = new ArrayList<>();

        secondList = new ArrayList<>();

    }

    private void initViews() {

    }

    private void initAtions() {

    }

源码