使用方法:
LineItemizedOverlay overlay = new LineItemizedOverlay();
overlay.addOverlay(/*起点的OverlayItem*/);
overlay.addOverlay(/*终点的OverlayItem*/);
overlay.addLinePoint(/*要画的轨迹的GeoPoint的List*/);
mapView.getOverlays().add(overlay);
/**
?*
?*/
package com.xtyon.tuola.truck.map;
import java.util.ArrayList;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.drawable.Drawable;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.ItemizedOverlay;
import com.google.android.maps.MapView;
import com.google.android.maps.OverlayItem;
import com.google.android.maps.Projection;
/**
?* 地图上的线型图层:包括一个起点,一个终点,以及之间的曲线
?* @author superwang
?*/
public class LineItemizedOverlay extends ItemizedOverlay<OverlayItem> {
?private static final int LAYER_FLAGS = Canvas.MATRIX_SAVE_FLAG | Canvas.CLIP_SAVE_FLAG
?? | Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.FULL_COLOR_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG;
?/**
? * 用于保存起点/终点数据
? */
?private final ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
?/**
? * 用于保存构成曲线的点的数据
? */
?private final ArrayList<GeoPoint> linePoints = new ArrayList<GeoPoint>();
?/**
? * @param defaultMarker
? */
?public LineItemizedOverlay() {
? super(null);
? // TODO Auto-generated constructor stub
?}
?/* (non-Javadoc)
? * @see com.google.android.maps.ItemizedOverlay#createItem(int)
? */
[email protected]
?protected OverlayItem createItem(int i) {
? return mOverlays.get(i);
?}
?/* (non-Javadoc)
? * @see com.google.android.maps.ItemizedOverlay#size()
? */
[email protected]
?public int size() {
? // TODO Auto-generated method stub
? return mOverlays.size();
?}
?/**
? * 调价起点/终点
? * description:
? * @param overlay
? */
?public void addOverlay(OverlayItem overlay) {
? mOverlays.add(overlay);
? populate();
?}
?/**
? * 添加曲线中的点
? * description:
? * @param point
? */
?public void addLinePoint(GeoPoint point) {
? linePoints.add(point);
?}
?public ArrayList<GeoPoint> getLinePoints() {
? return linePoints;
?}
?/**
? * 画起点/终点/轨迹
? */
[email protected]
?public void draw(Canvas canvas, MapView mapView, boolean shadow) {
? if (!shadow) {
?? //System.out.println("!!!!!!!!!!!!!!");
?? canvas.save(LAYER_FLAGS);
?? //canvas.save();
?? Projection projection = mapView.getProjection();
?? int size = mOverlays.size();
?? Point point = new Point();
?? Paint paint = new Paint();
?? paint.setAntiAlias(true);
?? OverlayItem overLayItem;
?? //画起点/终点
?? for (int i = 0; i < size; i++) {
??? overLayItem = mOverlays.get(i);
??? Drawable marker = overLayItem.getMarker(0);
??? //marker.getBounds()
??? /* 象素点取得转换 */
??? projection.toPixels(overLayItem.getPoint(), point);
??? if (marker != null) {
???? boundCenterBottom(marker);
??? }
??? /* 圆圈 */
??? //Paint paintCircle = new Paint();
??? //paintCircle.setColor(Color.RED);
??? paint.setColor(Color.RED);
??? canvas.drawCircle(point.x, point.y, 5, paint);
??? /* 文字设置 */
??? /* 标题 */
??? String title = overLayItem.getTitle();
??? /* 简介 */
??? //??? String snippet = overLayItem.getSnippet();
??? //
??? //??? StringBuffer txt = new StringBuffer();
??? //??? if (title != null && !"".equals(title))
??? //???? txt.append(title);
??? //
??? //??? if (snippet != null && !"".equals(snippet)) {
??? //???? if (txt.length() > 0) {
??? //????? txt.append(":");
??? //???? }
??? //???? txt.append(snippet);
??? //??? }???
??? //Paint paintText = new Paint();
??? if (title != null && title.length() > 0) {
???? paint.setColor(Color.BLACK);
???? paint.setTextSize(15);
???? canvas.drawText(title, point.x, point.y, paint);
??? }
?? }
?? //画线
?? boolean prevInBound = false;//前一个点是否在可视区域
?? Point prev = null;
?? int mapWidth = mapView.getWidth();
?? int mapHeight = mapView.getHeight();
?? //Paint paintLine = new Paint();
?? paint.setColor(Color.RED);
?? //paint.setPathEffect(new CornerPathEffect(10));
?? paint.setStrokeWidth(2);
?? int count = linePoints.size();
?? //Path path = new Path();
?? //path.setFillType(Path.FillType.INVERSE_WINDING);
?? for (int i = 0; i < count; i++) {
??? GeoPoint geoPoint = linePoints.get(i);
??? //projection.toPixels(geoPoint, point); //这一行似乎有问题
??? point = projection.toPixels(geoPoint, null);
??? if (prev != null) {
???? if (point.x >= 0 && point.x <= mapWidth && point.y >= 0 && point.y <= mapHeight) {
????? if ((Math.abs(prev.x - point.x) > 2 || Math.abs(prev.y - point.y) > 2)) {
?????? //这里判断点是否重合，重合的不画线，可能会导致画线不在路上
?????? canvas.drawLine(prev.x, prev.y, point.x, point.y, paint);
?????? //path.lineTo(point.x, point.y);
?????? prev = point;
?????? prevInBound = true;
????? }
???? } else {
????? //在可视区与之外
????? if (prevInBound) {//前一个点在可视区域内，也需要划线
?????? //path.lineTo(point.x, point.y);
?????? canvas.drawLine(prev.x, prev.y, point.x, point.y, paint);
????? }
????? prev = point;
????? prevInBound = false;
???? }
??? } else {
???? //path.moveTo(point.x, point.y);
???? prev = point;
??? }
?? }
?? //canvas.drawPath(path, paint);
?? canvas.restore();
?? //DebugUtils.showMemory();
? }
? super.draw(canvas, mapView, shadow);
?}
}