PathView.java

package com.znv.linkup.view;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.DashPathEffect;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Path;
import android.graphics.PathEffect;
import android.graphics.Point;
import android.view.Display;
import android.view.View;
import android.view.animation.AlphaAnimation;

import com.znv.linkup.R;
import com.znv.linkup.core.card.Piece;
import com.znv.linkup.view.animation.HideAnimation;

/**
 * 消除路径
 * 
 * @author yzb
 * 
 */
public class PathView extends View {

    public PathView(Activity linkup) {
        this((Context) linkup);

        // 根据屏幕分辨率设置path宽度
        Display mDisplay = linkup.getWindowManager().getDefaultDisplay();
        Point size = new Point();
        mDisplay.getSize(size);
        pathWidth = size.x / 60;

        paint.setStrokeWidth(pathWidth);
        PathEffect effect = new DashPathEffect(new float[] { pathWidth, pathWidth }, 0);
        paint.setPathEffect(effect);
    }

    public PathView(Context context) {
        super(context);

        paint.setStyle(Style.STROKE);
        paint.setStrokeWidth(pathWidth);
        paint.setColor(getResources().getColor(R.color.path_color));
        PathEffect effect = new DashPathEffect(new float[] { pathWidth, pathWidth }, 0);
        paint.setPathEffect(effect);

        alphaAnim.setDuration(500);
        HideAnimation hideAnim = new HideAnimation(this);
        alphaAnim.setAnimationListener(hideAnim);

        setVisibility(View.GONE);
    }

    /**
     * 显示消除路径
     * 
     * @param pieces
     *            路径卡片集合
     */
    public void showLines(List<Piece> pieces) {
        if (pieces == null || pieces.size() < 2) {
            return;
        }
        points = new ArrayList<Point>();
        for (Piece p : pieces) {
            points.add(p.getCenter());
        }

        setVisibility(View.VISIBLE);
        invalidate();
        startAnimation(alphaAnim);
    }

    /**
     * 绘制路径
     */
    protected void onDraw(Canvas canvas) {
        if (points == null || points.size() < 2) {
            return;
        }

        path.reset();
        Point p = points.get(0);
        path.moveTo(p.x, p.y);
        for (int i = 1; i < points.size(); i++) {
            path.lineTo(points.get(i).x, points.get(i).y);
        }

        canvas.drawPath(path, paint);
        super.onDraw(canvas);
    }

    private List<Point> points = null;
    private final Paint paint = new Paint();
    private final Path path = new Path();
    private int pathWidth = 5;
    private final AlphaAnimation alphaAnim = new AlphaAnimation(1, 0);
}