java - 根据实时跟踪地理点动态绘制线条

Question

我想在用户转向任何地方时动态地画一条线。当我们不断监听他的位置时，我正在努力研究如何使用用户地理点来绘制线条。我尝试过使用 moveTo 和 lineTo 但只能用于一行。感谢您提前的答复。!

更新:

public void draw(Canvas canvas, MapView mv, boolean shadow)
{
    Projection projection = mv.getProjection();
    ArrayList<GeoPoint> geoPoints = new ArrayList<GeoPoint>();
    //Creating geopoints - ommited for readability
    Path p = new Path();
    for (int i = 0; i < geoPoints.size(); i++) {
    if (i == geoPoints.size() - 1) {
        break;
    }
    Point from = new Point();
    Point to = new Point();
    projection.toPixels(geoPoints.get(i), from);
    projection.toPixels(geoPoints.get(i + 1), to);
    p.moveTo(from.x, from.y);
    p.lineTo(to.x, to.y);
    }
    Paint mPaint = new Paint();
    mPaint.setStyle(Style.FILL);
    mPaint.setColor(0xFFFF0000);
    mPaint.setAntiAlias(true);
    canvas.drawPath(p, mPaint);
    super.draw(canvas, mv, shadow);
}

图片:

无论用户在哪里，线条的绘制都必须跟随。

Answer 1

您可以使用 Path更具体地说:

private final Path mPath;
................
mPath.lineTo(lastXCoord,lastYCoord);