android精确取点组件(实用地图上取点瞄准)

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package com.huangxudong.widget;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.view.View;


public class PaintCycle extends View {

    private int cWidth;
    private int cHeight;
    private Path path = new Path();
    private Path pathLeft = new Path();
    private Path pathRight = new Path();
    private Path pathTop = new Path();
    private Path pathBottom = new Path();
    private Paint fillPaint = new Paint();
    private Paint sidePaint = new Paint();
    private Paint pointPaint = new Paint();
    public static PaintCycle INSTANCE;
    int[] centerPX = new int[2];
    private int offsetX;
    private int offsetY;
    private int moveX;
    private int moveY;

    public PaintCycle(Context context) {
        super(context);
        INSTANCE = this;

        this.cWidth = (910 / 2);
        this.cHeight = (603 / 2);

        this.sidePaint.setColor(Color.argb(255, 0, 0, 0));
        this.sidePaint.setStyle(Paint.Style.STROKE);
        this.sidePaint.setStrokeWidth(1.0F);
        this.sidePaint.setAntiAlias(true);

        this.fillPaint.setColor(Color.argb(32, 0, 0, 0));
        this.fillPaint.setStyle(Paint.Style.FILL);
        this.fillPaint.setAntiAlias(true);

        this.pointPaint.setColor(Color.argb(255, 237, 28, 36));
        this.pointPaint.setStyle(Paint.Style.FILL);
        this.pointPaint.setStrokeWidth(1.0F);
        this.pointPaint.setAntiAlias(true);

        move(0, 0);
    }

    public static PaintCycle getInstance() {
        return INSTANCE;
    }

    public int[] getCenterPX() {
        return this.centerPX;
    }

    protected void onDraw(Canvas canvas) {
        canvas.drawPath(this.path, this.sidePaint);
        canvas.drawPath(this.pathLeft, this.sidePaint);
        canvas.drawPath(this.pathRight, this.sidePaint);
        canvas.drawPath(this.pathTop, this.sidePaint);
        canvas.drawPath(this.pathBottom, this.sidePaint);

        canvas.drawPath(this.path, this.fillPaint);

        this.centerPX[0] = (this.cWidth + this.moveX + this.offsetX);
        this.centerPX[1] = (this.cHeight + this.moveY + this.offsetY);
        canvas.drawCircle(this.centerPX[0], this.centerPX[1], 1.5F,
                this.pointPaint);
    }

    public void move(int moveX, int moveY) {
        this.moveX = moveX;
        this.moveY = moveY;

        this.path.reset();
        this.path.moveTo(this.cWidth - 50 + moveX + this.offsetX, this.cHeight
                - 50 + moveY + this.offsetY);
        this.path.lineTo(this.cWidth + 50 + moveX + this.offsetX, this.cHeight
                - 50 + moveY + this.offsetY);
        this.path.lineTo(this.cWidth + 50 + moveX + this.offsetX, this.cHeight
                + 50 + moveY + this.offsetY);
        this.path.lineTo(this.cWidth - 50 + moveX + this.offsetX, this.cHeight
                + 50 + moveY + this.offsetY);
        this.path.close();

        this.pathLeft.reset();
        this.pathLeft.moveTo(this.cWidth - 70 + moveX + this.offsetX,
                this.cHeight + moveY + this.offsetY);
        this.pathLeft.lineTo(this.cWidth - 30 + moveX + this.offsetX,
                this.cHeight + moveY + this.offsetY);

        this.pathRight.reset();
        this.pathRight.moveTo(this.cWidth + 70 + moveX + this.offsetX,
                this.cHeight + moveY + this.offsetY);
        this.pathRight.lineTo(this.cWidth + 30 + moveX + this.offsetX,
                this.cHeight + moveY + this.offsetY);

        this.pathTop.reset();
        this.pathTop.moveTo(this.cWidth + moveX + this.offsetX, this.cHeight
                - 70 + moveY + this.offsetY);
        this.pathTop.lineTo(this.cWidth + moveX + this.offsetX, this.cHeight
                - 30 + moveY + this.offsetY);

        this.pathBottom.reset();
        this.pathBottom.moveTo(this.cWidth + moveX + this.offsetX, this.cHeight
                + 70 + moveY + this.offsetY);
        this.pathBottom.lineTo(this.cWidth + moveX + this.offsetX, this.cHeight
                + 30 + moveY + this.offsetY);

        postInvalidate();
    }

    public void moveFinish() {
        this.offsetX = (this.moveX + this.offsetX);
        this.offsetY = (this.moveY + this.offsetY);
        this.moveX = (this.moveY = 0);
    }

}