[英]How to draw route using multiple geopoints?
我正在為地圖活動實現一個Android應用程序。
我正在使用位置偵聽器獲取位置更新。 更新位置后,我將那些更新的緯度和經度值保存在數據庫中。
我可以使用源緯度,經度和目標緯度,經度值繪制從源到目的地的路線路徑。 但是一次要使用多個數據庫的經度和緯度值,我想繪制路徑。 我正在使用RoutePath.java類繪制多個緯度和經度的路線路徑。使用這些緯度和經度列表,我可以繪制路徑,但是它顯示的是點對點的直線,而沒有顯示路線。 見下圖...
如果您仔細觀察,路線上的某些點和路線路徑之外的某些點。 再次看到下面的全變焦圖片...
如果有人知道該問題的解決方案,請幫助我。
RoutePath.java:
public class RoutePath extends Overlay {
private int _pathColor;
private final List<GeoPoint> _points;
private boolean _drawStartEnd;
public RoutePath(List<GeoPoint> points) {
this(points, Color.RED, true);
}
public RoutePath(List<GeoPoint> points, int pathColor,
boolean drawStartEnd) {
_points = points;
_pathColor = pathColor;
_drawStartEnd = drawStartEnd;
}
private void drawOval(Canvas canvas, Paint paint, Point point) {
Paint ovalPaint = new Paint(paint);
ovalPaint.setStyle(Paint.Style.FILL_AND_STROKE);
ovalPaint.setStrokeWidth(2);
int _radius = 6;
RectF oval = new RectF(point.x - _radius, point.y - _radius, point.x
+ _radius, point.y + _radius);
canvas.drawOval(oval, ovalPaint);
}
public boolean draw(Canvas canvas, MapView mapView, boolean shadow,
long when) {
Projection projection = mapView.getProjection();
if (shadow == false && _points != null) {
Point startPoint = null, endPoint = null;
Path path = new Path();
// We are creating the path
for (int i = 0; i < _points.size(); i++) {
GeoPoint gPointA = _points.get(i);
Point pointA = new Point();
projection.toPixels(gPointA, pointA);
if (i == 0) { // This is the start point
startPoint = pointA;
path.moveTo(pointA.x, pointA.y);
} else {
if (i == _points.size() - 1)// This is the end point
endPoint = pointA;
path.lineTo(pointA.x, pointA.y);
}
}
Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setColor(_pathColor);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(5);
paint.setAlpha(90);
if (getDrawStartEnd()) {
if (startPoint != null) {
drawOval(canvas, paint, startPoint);
}
if (endPoint != null) {
drawOval(canvas, paint, endPoint);
}
}
if (!path.isEmpty())
canvas.drawPath(path, paint);
}
return super.draw(canvas, mapView, shadow, when);
}
public boolean getDrawStartEnd() {
return _drawStartEnd;
}
public void setDrawStartEnd(boolean markStartEnd) {
_drawStartEnd = markStartEnd;
}
}
您獲得了直線,因為GeoPoints只是這樣。.....意味着,如果您具有完整的路線,則它將根據您的Geopoints顯示。...這都取決於GeoPoints。
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